Thank you for your post. I have a 2007 Mazda 3, 2.3L. 180,000 miles. I replaced the TCM, because of tranny going into limp mode and it fixed it. Then after a while, morning startup and going a block to stop sign, tranny would show AT light and go into limp mode, but turning car off and then back on, AT light is gone and tranny is okay. Now about a year goes by and car starts showing AT light and going into limp mode plus shifting hard. I replaced the input speed sensor Mazda part #FN01-21-550, unplugged and cleaned all of the contacts going to the tranny. Car is running like new. No AT light. No hard shifts.
holy cow. I am having the same problem you are having. I replaced my TCM and the problems went away for a while but are back. I'm going going to replace this sensor and hopefully it will solve the problem. To make sure, this is the one right under the battery, right?
Hi! Excellent video! I’m new at this, so I don’t really know what you just said 😂, but I’ll keep watching your video over and over 🎉, until I do! Liked the fact that you drew a diagram somewhat life-size, and showed the actual parts, and then attempted to show where those parts went in your actual vehicle! The fact that you also stated the approximate price for each part, and where you got them, made your video top-rated in my book! Keep up doing excellent videos like this! You really help out the little guy! Thank you so much, again!!!
VSS sensor is the output speed sensor the top one is the intermediate shaft sensor . Output and intermediate are the same 3 pin sensors. Speedometer works by abs .
Ford parts…Mazda badge but Ford engine/components….no recall issue but with obvious problems…..I decided to spend the money while I had it…normally I don’t start backwards…I understand what you are referring to. My tcm was fried and all 3 sensors and solenoids were done for….that’s Ford for ya..
interesting info. you can flush it yourself real easily by disconnecting a hose from the front of the cooler, btw. just pump out 2 to 3 qt with car running and refill, 3 times.
I just did my tcm on my 07 mazda 3 after a no communication code prior to this it had a hard shift into 4th if you got on it much after replacing the tcm it now gets codes P0753 & P0791 and doesn't want to shift into 4th looks like I might have to go thru what you did as well I also relocated the tcm by firewall with zip ties on brake lines to avoid excessive heat as recommended.
@@brianlee677 I'm having a intermittent AT light with the code PO753, i replaced the TCM, and tested the solenoids with a ohms reader because they were so costly, but they all read fine.
First thank you so much for the deep dive on the Mazda/ford transmission in Mazda 3 and 5. Question: for preventive measures: would relocating the TCM to prevent overheating induced cold solders be sufficient on later model year of Mazda 5? I am curious if the solenoid and sensor replacement in your case we're caused by broken TCM behavior in the first place. I have a. 2015 mazda 5 sport auto with 75k miles on it and wish to change and refill the trans fluid soon.
Hello my friend, what is the name of that sensor that you teach at minute 2:11 and how can it be removed? I have a lot of transmission oil coming out of the surroundings of that sensor. I have tried to remove it by crushing the locks, but it does not come out and I do not want to force it. THANK YOU VERY MUCH FOR YOUR RESPONSE
The big one is the neutral position safety switch and the smaller circle one is just a solenoid pigtail or harness....the circle one is hard to pinch with pliers...when you remove it make sure to add dielectric grease in the connection prongs or wires....the circle one goes to the solenoids
@@car-u-fix-it8070 Thank you very much I understand and to remove it it would have to be from the inside by the body of the selenoids. Right? thank you very much my friend .
@@lucindoalmeida1848 no, from outside....neutral switch is outside ...solenoid pigtail is inside but the connection you saw at 2:11 is just outside...it’s hard to disconnect ...just use pliers like you did and pinch the sides and pull up....
Same problem here I'm trying to get the sensor out front the transmission block itself it keeps turning and pushs in on me but can't seem to get it to come out. Also trying to find the name of the sensor so I can get a replacement😢
Raul you're a blessing! I have a question for you, if you have the time i'd really appreciate any insight. Mazda 3, 2008 - low mileage (100k), AT was flushed twice. Shifts are starting to get rough, at light flashes. Sometimes it gets stuck. Code being recorded is P0841, transmission pressure sensor / switch A. Do you know is this sensor is on the outer body of the TCM? I could definitely disconnect them all and spray them down with electrical cleaner. I can't find a bloody thing about where this sensor is located on the mazda 3.
Analysis E .....check this post on the link I’ve found. Pressure control solenoid A is on the main transmission valve body...see picture www.mazda3tech.com/control_valve_body_removal_installation_fs5_a_el_-1015.html On my 2009 Mazda 5 4 cyl auto, there is another ,secondary valve body, behind firewall and above driveshaft...and it is a bit hard to access, but doable...there are two solenoids there...I would start by replacing the solenoid “A “ on main body....it’s cheap and easy to replace.
Analysis E : So the pressure solenoid A is only on the main valve body...the secondary valve body has pressure solenoid B...so it would be your Pressure solenoid A (different than shift solenoid A) that’s faulty....2.5 hour www.mazda3tech.com/solenoid_valve_removal_installation_fs5_a_el_-1050.html
@@car-u-fix-it8070 really appreciate your reply raul. I want to highlight for anyone reading this that p0841 is the transmission fluid pressure switch (TFPS), it's not a solenoid, but sure as hell looks like one! On the mazda 3, which is what I am working on, the switch resided above the transmission pan on the outer face, closer to the engine. It's behind the two tubes that run to 19-423 in this schematic catcar.info/mazda/?lang=en&l=bWFya2V0PT11c2F8fHN0PT01MHx8c3RzPT17IjEwIjoiTWFya2V0IiwiMjAiOiJVU0EiLCIzMCI6IjIwMDggTUFaREEzIiwiNDAiOiJHQVNPTElORS1FTkdJTkUgNC1DWUxJTkRFUiBUUkFOU01JU1NJT04iLCI1MCI6IjE5MjBBQiAtIEFVVE9NQVRJQyBUUkFOU01JU1NJT04gQ0FTRSAmIE1BSU4gQ09OVFJPTCBTWVNURU0gKDUtU1BFRUQpIn18fGNhdG5vPT1BVUJBMTJ8fGdycD09QzEgfHxzZWM9PTE5MjBBQnx8eWVhcj09MjAwOA%3D%3D I will comment again after i've cleaned it with electrical spray, but I have also ordered a new one. They are about 100 on ebay, and becoming harder to find. Just waiting for the rain to stop!
Would these sensors and procedures be the same in a 2010 Mazda3 2.5L ? Do you have part numbers for the solenoids and sensors? I really appreciate your clarity of explanations and illustration. Best I've seen for Mazda stuff.
Hey did you get a P0720 code? And did you only replace the output sensor or did you also replace the tcm too? I hope you got your car fixed because mine just ran into these issues
@@SYDNEYSLOTS yea I fixed it. There are two output speed sensors, one underneath the ECU and the other is under the car on the transmission. However, I did things kind of back-ass-wards and bought a refurbished tcm before learning the about the second output speed sensor. I ended up replacing both, which fixed my issue, however I don’t know if my code was also causing and AT warning light to come on or if that was a separate issue that was fixed by replacing the tcm
Hello sir, great video! I have the same car and it's giving me lot of issues. One day I got of highway and stopped at a redlight but when I tried to drive forword it didn't do anything just sitting there on Drive and not moving forward. I also checked the transmission fluid but it was leveled. Auto workshop changed the transmission with a used one it started working but after some time same issue happened again. I replaced the transmission in warranty again but same problem again after driving for some time. I don't know what's the issue, currently it's not moving at all just showing AT light after putting on drive for some time. I scanned the vehicle it shows P0894 Transmission Component Slipping. I checked the wiring and TCM is also a new one. It would be really great if you can guide me about it. Thank you
@@car-u-fix-it8070 But even after changing transmission 2 times why the same issue is coming back again and again for different transmissions. I don't know what's going on.
I'm getting a P0841 and P0732 codes. Already replaced the TCM and the sensors using your video, but these codes reference the transmission fluid pressure sensor/switch "A" Circuit Range performance and Gear 2 Incorrect Ratio respectively. Using the BlueDriver OBD Scan tool it offered replacing the transmission oil pressure switch and automatic transmission shift solenoid. I'm planning on dropping the transmission pan (again) and replacing the solenoids, fluid and filter (I had already replaced the fluid/filter about 10k ago while using your video to replace the sensors and TCM...thanks!). My question is, where is the pressure switch? Been trying to find the location online but no luck. I didn't think about dirty connectors so I'll use some CRC on those.
Check out the solenoid valve body link I sent ya….your is the solenoid A….if you got to do the solenoids….I would just replace them all..!!!you can get all of them for $80 bucks or so….and replace one at a time….same thing happened to me…tcm…still problems…sensors…more problems…so I just replaced all the solenoids….been driving for a long time now and no issues
So you don’t think the fluid pressure switch is one of the problems for P0841? I bought I kit on Amazon that came with two solenoids, the pan gasket and filter but I might just spend the extra money on the entire valve body (my car is an ‘07 Mazda 3 2.3). I already bought a new pressure switch. I just need to know where it is 😂
@@SupaHogg look at this diagram on the link i sent you…you can see the pressure solenoid A ….Orient yourself under you car with picture and it will be easy to identify…..it’s the solenoid next to the “two big solenoids”….but yes I would just switch them all out as I started with the kit….and got another solenoid go out soon after….like they were timed to go out just when I thought all was fine😵💫😵💫
Buena aplicación pero aunque no hablo mucho English pero la excelente atención I explicación fue buena me gustaría saber todo bien en español si puedes ayudar en español tengo un problema igual con mi Mazda 3 s 2008 2.3L
Hope you don't mind, need advice on a 07 Mazda 5. Drove my car thru water on a recent storm, then my car started to have transmission problems. Car would go on reverse with no problem. When I shift to drive, I see it shifting 1-2-3 even without the car moving. My TCM is in my computer, it's not seperate like yours. Would replacing the speed sensors fix my problem?
An 2007? Well, what I can think is that the water got to the transmission pigtail connection and neutral safety switch under the air box....removing the air box you can seen the sensors...unplug....spray with CRC electrical cleaner..then smother the connections with di-electric grease..connect back....if that don’t work replace the VSS sensor right next to cv axle and transmission....not hard...trans fluid will ooze out ...but please make sure to use ppe and I am not liable for any damage as I am just suggesting...repair at your own risk....sorry I need to say that in my response...legal stuff you know
Hello, you mentioned that there are 2 of the same output sensor but I cant find where they both are. I see there is one under the car and I see where the input sensor goes but I just dont know where the second output sensor goes. Help would be much appreciated! Thank you
My 2008 Mazda 3 hatchback needs the (transmission Intermediate shaft speed sensor) can u give me a link of where I can buy please. I have no idea what I'm looking for😔
eBay….just type Year, make, model and vehicle speed sensor….you will get results…or goggle search….you will get two types of sensors….one sits atop trans…but the one you want is the fatter sensor….search engine only has two results….a skinny sensor and a fatter sensor…it’s the fatter one
Hi, scan for codes. Harbor freight has cheap code readers. This is the fastest, easiest, cheapest way to troubleshoot your problem….get back to us once you get some codes….
Nice video, my 2007 mazda3s 2.0L AT light on and engine light on, the code is P0791. Should i change the input and output transmission speed sensors? Thanks
My suggestion is to replace the sensor where the cv axle meets the transmission...p0791 is for intermediate sensor and it’s under the transmission not the top one...both the top sensor and below are the same sensor they just name them a little different....look at this thread.... www.mazda3forums.com/threads/mazda-3-p0791-cel-at-indicator-on-off.767228/
Quick question I know your video was posted 3 years ago but I got a 2011 mazda 3 2.5 with a code p0720 for the output speed sensor which sensor from the ones showing is that ?
Dude your video is right on point I have a Mazda mpv 03 it shifts and drive in forward but it want shift or drive in reverse when I shift in R any suggestions 🤔? There are no transmission codes?
Hi you doing? I have a 2012 mazda 3 2.5L code p0720 i installed 2 speed sensors (vss) and the transmission gives me the same code over and over, help please...
What were all the codes that your vehicle was throwing at that time that you were fixing everything? Would like to see all the codes listed please if you remember
@@Devo1987 I am sorry dude but in my frustration I did not remember or wrote them down. I do remember all codes pointed to solenoids and 3 sensors nothing else…
Yes smaller one input is 8 dollars.....but it depends on the eBay seller.....can go from 8 to 16 bucks......I order two of each as the price might indicate the quality but so far 1 month and no problems....
Hey bro. I have a 2010 Mazda 3 no engine light took it to advance auto parts and no codes popped up. But when I drive it on high way my car jerks and it feels like it down shifts. The only light that comes on is the AT light but turns back off. Any suggestions?
Sounds like your TCM IS DONE…that’s what happened to my 2009…. But the first thing is check fluid level and condition….My car gradually would do the down shift, get better one day and act up the next….buy it new instead of used….or remanufactured…I paid around $450 back in 2018? Still going well…:diy at your own risk…….hope it helps
To reset the transmission on the Mazda you need to turn on the ignition, but not the motor, and then press the gas to the floor for 30 seconds. Now release it and turn on the vehicle. The transmission will now be reset. Try resetting the tcm by following the instructions above….hope it helps
In my case I have 3 sensors…input , output & Vss …to be honest I don’t remember ….I looked up my codes and that’s how I started with my input….then the other two went out on me
Part number: (for my wagon) but look it up to see it….: FN12-21-551A Isumo brand….$16 dollars….if you want oem then get ready to pay $60 to $100 …if you order the cheaper version …just order two as the same sensor is used twice in the cars but named different…same crap
Which one of these would be most likely to cause the gear indicator light to flicker intermittently and seem like the car is shifting into neutral for a second?
There is a gear switch…below air filter box …it’s next to the connection where all the solenoid wires go to….it’s a round one but you want to look at the flat switch next to round one….unplug them carefully and spray CRC electrical cleaner on both ends…then apply dielectric grease to prongs of switch or other end…not too heavy….try this before buying a new Safety neutral switch…….fyi..repair at own risk: legal crap…🙂
@@car-u-fix-it8070 Ok, I unplugged both, cleaned them up as recommended, added some dielectric grease. No change. Could it be one of the the other two trans sensors or TCM?
@@jretta91 when you say gear indicator …like the actual gear shift lights …R N D 1 2…..if that’s the case I suspect it is the neutral safety switch….I did not experience your symptoms…but with no codes start from the cheapest sensor….or the probable faulty in this case the safety neutral switch….best luck
@@car-u-fix-it8070 In the center of the dash, it says P, R, N, below that it will display D only when in drive. The D will randomly turn off, and the transmission will kick down a gear or two. Almost seems like a loose connection of one of those sensors, but maybe the it's just the TCM going bad.
@@jmixzin VSS is at the axle hub…if you replaced that one you would still have the code…as the code p0720 points to “output” speed sensor…it’s atop of the transmission towards the back top part…..VSS and output sensor are the same sensor they just use it in different places and call it different…..diy at your own risk….best wishes
Hello Raul, I changed the 3 sensor but my speedometer still doesn't work, and all my dashboard lights are showing. What can it be? every stared after I replaced my front CV axels.
The VSS sensor is located on the cv axle hub.... So the axle you bought is missing something? Just a thought.... On my car.. VSS sensor is on the passenger side inner axle....
Hey so I'm having mostly dame problem.. code said solenoid 2 stuck.. so I replaced all of them . Drove around the block Everything was fine.. until I went to leave out again and the AT light was back on.. and still drives just won't shift of 2nd.. Can you please help I don't have a man to help me w these kinds of things, and I'd like to fix this myself w maybe your help.. thx
@Car-u-fix-it ? it's a 2005 mazda 3 .. it said solenoid 2 stuck.. I'm trying to find my print out to get code #.. I'll have to get back to you.. thank you so much for dealing w all that password bs to get back on here to help .. I really appreciate that
For sure plan on ordering a solenoid once you get the codes..as it’s crucial to know the code so you can order the right solenoid….but you can do it ..it’s not hard…Keep is posted on the code number
I just realized you replaced all the valve body solenoids……!!…then your issue will be a sensor or the pcm…since your car is different than the 2.3 or 2.5L ….
hey guys i really really need help with a Mazda premacy 4DW that only shifts up to 3 gear then my AT light comes on with my check engine light. for some reason my TCM isnt under the battery box. where els can i look? its the same a 2010 Mazda 5.
Premacy? Thats from another country I think....in that case, the PCM has the TCM inside it....or the Main computer module controls the transmission....so you only have one computer module......I would start with the speed sensors first as they are cheap....
At dealer it costs about $40 to $60 dollars….order it online then have a mechanic change it…be cheaper…but repair at your own risk…I have to say this for legal reasons…
I cleaned them with CRC electric cleaner…but MAF would be ok I guess….FYI My suggestions are just that, clean at your own risk…sorry I have to say that legal crap now…
@@car-u-fix-it8070 how did you remove the top two sensor? The connections. I got the rectangular looking one out but I'm having trouble with the circled one. Edit: Nvm I got it
@@weisoman5323 how were you able to get the whole round one out mine spins in circles and pushes inwards on me but won't seem to come out and I'm a lil nervous maybe I busted something in my trans pushing it in a little bit but I'm not sure? I'm having fluid leak from all around the while round sensor.
Hey I have an output speed sensor code. I’ve replaced all the sensors and the tcm. The car won’t shift into 5th and the code reader computer won’t get a reading for the oss rpm and the vss speed.
There is a speed sensor on the driveshaft next to the transmission wall...have you replaced that particular sensor? The passenger axle next to trans wall....
Top sensors are input and output......the only sensor that is close to or on the shaft is the VSS sensor.....center of car underside....so raise the car and crawl under and look by transmission mount....its in one of my vids...but I dont know your year/model....use jack stands for safety....glasses all that safety stuff
Hi, do you have the part number of the output speed sensor? It look a bit different than the input one, but I can't seem to find the OEM part number online
@@car-u-fix-it8070 Hi, I checked with my local Mazda dealer with VIN of my car and they gave me same part number FN1221551A. But they weren't able to confirm to me if this is input or output sensor, just says it sit on the back of the transmission and there is another called turbine pules generator with part number FN0121550 sits on top of the transmission like the one you replaced in your video. Is the one you replaces in your video the input sensor? Thanks
@@liang2512 it’s the output and VSS …yes it sits at the back of transmission axle right at the place where the axle meets the transmission….that’s the VSS….output sits on top of transmission towards the back..(top back) turbine is the input sensor and much smaller….just buy two of them on eBay and change them both…
william maradiaga ...Same type of sensor...yes but two different locations...VSS is on drive shaft and output is atop transmission. Same crap..I ordered three vss sensors just in case any went out
Raul Repreza not as far as i saw on my obd2 . I checked on my scanner but probably . Today it slipped 3 times . Once in 5th gear and another two times in 2nd
How many miles,? And have you changed trans fluid...... If no codes, maybe it is the trans bands worn.... Try Lucas trans slip.... Half a bottle down the dip stick.... I have done two trans fluid changes 10000 miles apart and the stinking OE fluid($16 per quart) came out ugly... I got 80kmiles on mine....lets hope it's a bad connection.....
Raul Repreza im at 120k miles , never changed fluid but never had an issue. AT light comes on. Im gonna get the mechanic to scan it he loves Mazdas he prob has an extra TCM
What are the codes? It sounds as if it’s in limp mode….could be the tcm or a solenoid…scan for codes and it will be easier to pinpoint the issue….if you don’t have a code reader just borrow one from autozone or oreillys
@@car-u-fix-it8070 I have codes p0500 and p0715. On my 04 Mazda 3 I need help finding parts online. It’s a vehicle speed sensor and input turbine speed sensor
Never mind they are the same for both years...rockauto.com has both...input is $9.80 and output is $29 but once you look at the pictures...go to eBay and type input speed sensor for your year and model and you will see each sensor super cheap...both sensors are located on top of transmission and you get to them by removing air box and a few other stuff...not hard....use CRC ELECTRICAL cleaner and clean areas where sensors are located
My 2010 Mazda3 will not shift into 3rd, 4th, or5th. Mazda has had it for over a month. They replaced the TCM, all b modules and the internal solenoid wiring harness and it is the same as when I took it in to them. They have no clue as to what is wrong. Still shows that the b solenoids need to be replaced. Any idea as to what is wrong?
Dude your video is the only one showing where these suckers are. Thanks a bunch!!
cool, glad it helped.......
service manuals help alot... just saying
Thank you for your post. I have a 2007 Mazda 3, 2.3L. 180,000 miles. I replaced the TCM, because of tranny going into limp mode and it fixed it. Then after a while, morning startup and going a block to stop sign, tranny would show AT light and go into limp mode, but turning car off and then back on, AT light is gone and tranny is okay. Now about a year goes by and car starts showing AT light and going into limp mode plus shifting hard. I replaced the input speed sensor Mazda part #FN01-21-550, unplugged and cleaned all of the contacts going to the tranny. Car is running like new. No AT light. No hard shifts.
holy cow. I am having the same problem you are having. I replaced my TCM and the problems went away for a while but are back. I'm going going to replace this sensor and hopefully it will solve the problem. To make sure, this is the one right under the battery, right?
Hi! Excellent video! I’m new at this, so I don’t really know what you just said 😂, but I’ll keep watching your video over and over 🎉, until I do! Liked the fact that you drew a diagram somewhat life-size, and showed the actual parts, and then attempted to show where those parts went in your actual vehicle! The fact that you also stated the approximate price for each part, and where you got them, made your video top-rated in my book! Keep up doing excellent videos like this! You really help out the little guy! Thank you so much, again!!!
Thanks a million, your video was very well explained, and very helpful. I will work on my mazda 3. thank you very much again
Your welcome...
VSS sensor is the output speed sensor the top one is the intermediate shaft sensor . Output and intermediate are the same 3 pin sensors. Speedometer works by abs .
Yeah I'm confused too
Great help. Thank you so much
I'm confused on why you replaced the most expensive part first but very informative video thank you
Ford parts…Mazda badge but Ford engine/components….no recall issue but with obvious problems…..I decided to spend the money while I had it…normally I don’t start backwards…I understand what you are referring to. My tcm was fried and all 3 sensors and solenoids were done for….that’s Ford for ya..
@@car-u-fix-it8070 Makes sense, if you got money to throw at it why not 😂
@@Avaddon911 I felt rich that one time…..just buy it all…don’t worry about it…$450 dollars? No problem……
interesting info.
you can flush it yourself real easily by disconnecting a hose from the front of the cooler, btw. just pump out 2 to 3 qt with car running and refill, 3 times.
I just did my tcm on my 07 mazda 3 after a no communication code prior to this it had a hard shift into 4th if you got on it much after replacing the tcm it now gets codes P0753 & P0791 and doesn't want to shift into 4th looks like I might have to go thru what you did as well I also relocated the tcm by firewall with zip ties on brake lines to avoid excessive heat as recommended.
I am having the same problem. Have you found any resolutions?
I ended up getting a new tcm from dealer and new solenoids seems to be good now but was costly.
@@brianlee677 I'm having a intermittent AT light with the code PO753, i replaced the TCM, and tested the solenoids with a ohms reader because they were so costly, but they all read fine.
very helpfull thank you god bless
First thank you so much for the deep dive on the Mazda/ford transmission in Mazda 3 and 5.
Question: for preventive measures: would relocating the TCM to prevent overheating induced cold solders be sufficient on later model year of Mazda 5? I am curious if the solenoid and sensor replacement in your case we're caused by broken TCM behavior in the first place. I have a. 2015 mazda 5 sport auto with 75k miles on it and wish to change and refill the trans fluid soon.
Can you post the link anywhere for the input and output sensors? Looking up input and output just brings up the same sensors sadly
Hello my friend, what is the name of that sensor that you teach at minute 2:11 and how can it be removed? I have a lot of transmission oil coming out of the surroundings of that sensor. I have tried to remove it by crushing the locks, but it does not come out and I do not want to force it. THANK YOU VERY MUCH FOR YOUR RESPONSE
The big one is the neutral position safety switch and the smaller circle one is just a solenoid pigtail or harness....the circle one is hard to pinch with pliers...when you remove it make sure to add dielectric grease in the connection prongs or wires....the circle one goes to the solenoids
@@car-u-fix-it8070 Thank you very much I understand and to remove it it would have to be from the inside by the body of the selenoids. Right? thank you very much my friend .
@@lucindoalmeida1848 no, from outside....neutral switch is outside ...solenoid pigtail is inside but the connection you saw at 2:11 is just outside...it’s hard to disconnect ...just use pliers like you did and pinch the sides and pull up....
Same problem here I'm trying to get the sensor out front the transmission block itself it keeps turning and pushs in on me but can't seem to get it to come out. Also trying to find the name of the sensor so I can get a replacement😢
@@chelseyrobson1282 It's not a sensor, it's a connector. Fix the leak by removing it from the inside.
Raul you're a blessing! I have a question for you, if you have the time i'd really appreciate any insight. Mazda 3, 2008 - low mileage (100k), AT was flushed twice. Shifts are starting to get rough, at light flashes. Sometimes it gets stuck. Code being recorded is P0841, transmission pressure sensor / switch A. Do you know is this sensor is on the outer body of the TCM? I could definitely disconnect them all and spray them down with electrical cleaner. I can't find a bloody thing about where this sensor is located on the mazda 3.
Analysis E .....check this post on the link I’ve found. Pressure control solenoid A is on the main transmission valve body...see picture
www.mazda3tech.com/control_valve_body_removal_installation_fs5_a_el_-1015.html
On my 2009 Mazda 5 4 cyl auto, there is another ,secondary valve body, behind firewall and above driveshaft...and it is a bit hard to access, but doable...there are two solenoids there...I would start by replacing the solenoid “A “ on main body....it’s cheap and easy to replace.
Short answer: solenoid A is inside valve body cover...
Analysis E : So the pressure solenoid A is only on the main valve body...the secondary valve body has pressure solenoid B...so it would be your Pressure solenoid A (different than shift solenoid A) that’s faulty....2.5 hour www.mazda3tech.com/solenoid_valve_removal_installation_fs5_a_el_-1050.html
@@car-u-fix-it8070 really appreciate your reply raul. I want to highlight for anyone reading this that p0841 is the transmission fluid pressure switch (TFPS), it's not a solenoid, but sure as hell looks like one! On the mazda 3, which is what I am working on, the switch resided above the transmission pan on the outer face, closer to the engine. It's behind the two tubes that run to 19-423 in this schematic catcar.info/mazda/?lang=en&l=bWFya2V0PT11c2F8fHN0PT01MHx8c3RzPT17IjEwIjoiTWFya2V0IiwiMjAiOiJVU0EiLCIzMCI6IjIwMDggTUFaREEzIiwiNDAiOiJHQVNPTElORS1FTkdJTkUgNC1DWUxJTkRFUiBUUkFOU01JU1NJT04iLCI1MCI6IjE5MjBBQiAtIEFVVE9NQVRJQyBUUkFOU01JU1NJT04gQ0FTRSAmIE1BSU4gQ09OVFJPTCBTWVNURU0gKDUtU1BFRUQpIn18fGNhdG5vPT1BVUJBMTJ8fGdycD09QzEgfHxzZWM9PTE5MjBBQnx8eWVhcj09MjAwOA%3D%3D
I will comment again after i've cleaned it with electrical spray, but I have also ordered a new one. They are about 100 on ebay, and becoming harder to find.
Just waiting for the rain to stop!
hey sir. I have the same problem with the same code. Can you help me do something to fix the problem? I'd really appreciate your help
Would these sensors and procedures be the same in a 2010 Mazda3 2.5L ? Do you have part numbers for the solenoids and sensors? I really appreciate your clarity of explanations and illustration. Best I've seen for Mazda stuff.
I can’t be certain for a 2010......maybe not
Hey did you get a P0720 code? And did you only replace the output sensor or did you also replace the tcm too? I hope you got your car fixed because mine just ran into these issues
@@FlipBojii got the same code and save problems. Did you end up fixing the problem
@@SYDNEYSLOTS yea I fixed it. There are two output speed sensors, one underneath the ECU and the other is under the car on the transmission. However, I did things kind of back-ass-wards and bought a refurbished tcm before learning the about the second output speed sensor. I ended up replacing both, which fixed my issue, however I don’t know if my code was also causing and AT warning light to come on or if that was a separate issue that was fixed by replacing the tcm
You didn't got any error codes on the scanner? just replace all the sensors. The Main computer should tell you which one is bad
Do you know where is the TFP sensor? I have a code for P0481
Any luck? Have the same code lol
Hello sir, great video!
I have the same car and it's giving me lot of issues. One day I got of highway and stopped at a redlight but when I tried to drive forword it didn't do anything just sitting there on Drive and not moving forward. I also checked the transmission fluid but it was leveled. Auto workshop changed the transmission with a used one it started working but after some time same issue happened again. I replaced the transmission in warranty again but same problem again after driving for some time.
I don't know what's the issue, currently it's not moving at all just showing AT light after putting on drive for some time. I scanned the vehicle it shows P0894 Transmission Component Slipping. I checked the wiring and TCM is also a new one.
It would be really great if you can guide me about it.
Thank you
The used transmission has problems…
@@car-u-fix-it8070 Yes, I will ask to change it.
@@car-u-fix-it8070 But even after changing transmission 2 times why the same issue is coming back again and again for different transmissions. I don't know what's going on.
You probably never even had to replace your TCM if that didn't fix the problem it was probably just your speed sensor buddy
We got the same issue too
I'm getting a P0841 and P0732 codes. Already replaced the TCM and the sensors using your video, but these codes reference the transmission fluid pressure sensor/switch "A" Circuit Range performance and Gear 2 Incorrect Ratio respectively. Using the BlueDriver OBD Scan tool it offered replacing the transmission oil pressure switch and automatic transmission shift solenoid. I'm planning on dropping the transmission pan (again) and replacing the solenoids, fluid and filter (I had already replaced the fluid/filter about 10k ago while using your video to replace the sensors and TCM...thanks!). My question is, where is the pressure switch? Been trying to find the location online but no luck. I didn't think about dirty connectors so I'll use some CRC on those.
www.google.com/search?q=2009+mazda+5+valve+body&ie=UTF-8&oe=UTF-8&hl=en-us&client=safari#imgrc=6Z8v7T77biqXoM
Check out the solenoid valve body link I sent ya….your is the solenoid A….if you got to do the solenoids….I would just replace them all..!!!you can get all of them for $80 bucks or so….and replace one at a time….same thing happened to me…tcm…still problems…sensors…more problems…so I just replaced all the solenoids….been driving for a long time now and no issues
So you don’t think the fluid pressure switch is one of the problems for P0841? I bought I kit on Amazon that came with two solenoids, the pan gasket and filter but I might just spend the extra money on the entire valve body (my car is an ‘07 Mazda 3 2.3). I already bought a new pressure switch. I just need to know where it is 😂
@@SupaHogg look at this diagram on the link i sent you…you can see the pressure solenoid A ….Orient yourself under you car with picture and it will be easy to identify…..it’s the solenoid next to the “two big solenoids”….but yes I would just switch them all out as I started with the kit….and got another solenoid go out soon after….like they were timed to go out just when I thought all was fine😵💫😵💫
Buena aplicación pero aunque no hablo mucho English pero la excelente atención I explicación fue buena me gustaría saber todo bien en español si puedes ayudar en español tengo un problema igual con mi Mazda 3 s 2008 2.3L
AL ratito.. Ahorita andamos locos con Covid-19.... Escribame su problem de su carro, talvez es igual que El mio
look at my new video on VSS sensor leak fix......replaced transmission sensor and it was leaking fluid....easy fix.....
have a 2013 mazda 3 with code p0780 and p0872, says circut c. if i replace the solenoids itll help? i think the tcm is ok cause the at light flashes.
hello i am confused because first you said the 3 pin is the output sensor and a bit later you said the 2 pin was the output sensor
Great video but confused due to the first sensor on top with the metal on. You said it was input then output then input lol
Your right…I screwed up on the vid…been so long I can’t remember….will try to update it
@@car-u-fix-it8070 still outstanding video. Thank you!!
Hope you don't mind, need advice on a 07 Mazda 5. Drove my car thru water on a recent storm, then my car started to have transmission problems. Car would go on reverse with no problem. When I shift to drive, I see it shifting 1-2-3 even without the car moving. My TCM is in my computer, it's not seperate like yours. Would replacing the speed sensors fix my problem?
An 2007? Well, what I can think is that the water got to the transmission pigtail connection and neutral safety switch under the air box....removing the air box you can seen the sensors...unplug....spray with CRC electrical cleaner..then smother the connections with di-electric grease..connect back....if that don’t work replace the VSS sensor right next to cv axle and transmission....not hard...trans fluid will ooze out ...but please make sure to use ppe and I am not liable for any damage as I am just suggesting...repair at your own risk....sorry I need to say that in my response...legal stuff you know
@@car-u-fix-it8070 Thank you, I will try that
Hello, you mentioned that there are 2 of the same output sensor but I cant find where they both are. I see there is one under the car and I see where the input sensor goes but I just dont know where the second output sensor goes. Help would be much appreciated! Thank you
You have to remove the battery and all the wires I point to….it’s about 8 inches behind the input sensor….if you have a Mazda 5 like mine….
My front wiper system doesn't turn on any ideas of what's going on?
It has a new engine new switch yet it doesn't work.
Check your relays ….it might have blow out. I don’t know which one it is
A shop replaced my speed sensor and the engine light is still coming on any advice would be sososo appreciated 😭
Take it to headquarter Mazda XD
My 2008 Mazda 3 hatchback needs the (transmission Intermediate shaft speed sensor) can u give me a link of where I can buy please. I have no idea what I'm looking for😔
eBay….just type Year, make, model and vehicle speed sensor….you will get results…or goggle search….you will get two types of sensors….one sits atop trans…but the one you want is the fatter sensor….search engine only has two results….a skinny sensor and a fatter sensor…it’s the fatter one
Hello, i need help with a 2006 mazda 3 2.3l. I have a intermittent AT light and hard shifts out of first. I would really love some help!
Hi, scan for codes. Harbor freight has cheap code readers. This is the fastest, easiest, cheapest way to troubleshoot your problem….get back to us once you get some codes….
Check your transmission fluid color (brown to dark is bad) and transmission mounts..to see if the rubber is torn or worn out
@@car-u-fix-it8070 Its P0573, i have a code scanner
@@car-u-fix-it8070 P0753* i have recently flushed my transmission fluid, i have not checked mounts
@@pencilbreaker6915 it’s related to a brake switch…I don’t think it is the code …perhaps you have more codes?
Nice video, my 2007 mazda3s 2.0L AT light on and engine light on, the code is P0791. Should i change the input and output transmission speed sensors?
Thanks
My suggestion is to replace the sensor where the cv axle meets the transmission...p0791 is for intermediate sensor and it’s under the transmission not the top one...both the top sensor and below are the same sensor they just name them a little different....look at this thread....
www.mazda3forums.com/threads/mazda-3-p0791-cel-at-indicator-on-off.767228/
@@car-u-fix-it8070 Thank you very much
@@Billy.T. How did this go for you?
Camera angles missing the parts as your talking about them .....
A & B solenoids are weak point .
The smaller shiny solenoids.
Quick question I know your video was posted 3 years ago but I got a 2011 mazda 3 2.5 with a code p0720 for the output speed sensor which sensor from the ones showing is that ?
The big one….on top….three prong inside…but I don’t know if 2011 is the same though… in my video I mention the output sensor…top right side
What did you do because I have the same exact car with the same code? Did you replace the tcm or just the output sensor?
Dude your video is right on point I have a Mazda mpv 03 it shifts and drive in forward but it want shift or drive in reverse when I shift in R any suggestions 🤔? There are no transmission codes?
Gear selector switch or neutral safety switch……or the solenoid pertaining to reverse is out…worst case scenario is the trans is bad…
Check fluid level and maybe change the pan oil and add Lucas trans fix
Is the Output sensor and the Rear sensor the same Part, they look identical?
Yes they are….same crap…I ordered mine from eBay and order more than one if you can…
Hi you doing? I have a 2012 mazda 3 2.5L code p0720 i installed 2 speed sensors (vss) and the transmission gives me the same code over and over, help please...
2012 is very different ..I think everything changed in 2012…my car is a 2009
You ours indicates it is the OUTPUT SPEED SENSOR…a smaller one and not the VSS …
What were all the codes that your vehicle was throwing at that time that you were fixing everything? Would like to see all the codes listed please if you remember
Ok will try to remember
@@car-u-fix-it8070 codes please ?
@@Devo1987 I am sorry dude but in my frustration I did not remember or wrote them down. I do remember all codes pointed to solenoids and 3 sensors nothing else…
Pulled my sensor wires out when removing my tranny, wouldnt have know which way they go in if not for you.
-peace
You got me confuse wich one is input that 8 dollars one or the 16 dollar one?
Yes smaller one input is 8 dollars.....but it depends on the eBay seller.....can go from 8 to 16 bucks......I order two of each as the price might indicate the quality but so far 1 month and no problems....
@@car-u-fix-it8070 what socket or wrench inches or mm? You used?
@@bibbykhriz 10mm deep socket
@@car-u-fix-it8070 thanks man i just fix my car thanks for your video it was way easy
@@bibbykhriz AWSOME...good to hear....
My Mazda 3 only shift from 1 to 4 will the input senser fix that
What are your codes?
@@car-u-fix-it8070 I don't know right this minute but am going to pick up a scanner right now
Hey bro. I have a 2010 Mazda 3 no engine light took it to advance auto parts and no codes popped up. But when I drive it on high way my car jerks and it feels like it down shifts. The only light that comes on is the AT light but turns back off. Any suggestions?
Sounds like your TCM IS DONE…that’s what happened to my 2009…. But the first thing is check fluid level and condition….My car gradually would do the down shift, get better one day and act up the next….buy it new instead of used….or remanufactured…I paid around $450 back in 2018? Still going well…:diy at your own risk…….hope it helps
To reset the transmission on the Mazda you need to turn on the ignition, but not the motor, and then press the gas to the floor for 30 seconds. Now release it and turn on the vehicle. The transmission will now be reset.
Try resetting the tcm by following the instructions above….hope it helps
Trans speed sensors have 2 input and output, so how do you know which one to replace
In my case I have 3 sensors…input , output & Vss …to be honest I don’t remember ….I looked up my codes and that’s how I started with my input….then the other two went out on me
My car has a code for bad output sensor. Is your but idk if it's a 2 or 3 plug.....
What year and model? My output speed sensor is the same as the VSS sensor on drive shaft…same sensor…3 prong
Part number: (for my wagon) but look it up to see it….: FN12-21-551A Isumo brand….$16 dollars….if you want oem then get ready to pay $60 to $100 …if you order the cheaper version …just order two as the same sensor is used twice in the cars but named different…same crap
Which one of these would be most likely to cause the gear indicator light to flicker intermittently and seem like the car is shifting into neutral for a second?
There is a gear switch…below air filter box …it’s next to the connection where all the solenoid wires go to….it’s a round one but you want to look at the flat switch next to round one….unplug them carefully and spray CRC electrical cleaner on both ends…then apply dielectric grease to prongs of switch or other end…not too heavy….try this before buying a new Safety neutral switch…….fyi..repair at own risk: legal crap…🙂
@@car-u-fix-it8070 Ok, I unplugged both, cleaned them up as recommended, added some dielectric grease. No change. Could it be one of the the other two trans sensors or TCM?
@@jretta91 any codes?
@@jretta91 when you say gear indicator …like the actual gear shift lights …R N D 1 2…..if that’s the case I suspect it is the neutral safety switch….I did not experience your symptoms…but with no codes start from the cheapest sensor….or the probable faulty in this case the safety neutral switch….best luck
@@car-u-fix-it8070 In the center of the dash, it says P, R, N, below that it will display D only when in drive. The D will randomly turn off, and the transmission will kick down a gear or two. Almost seems like a loose connection of one of those sensors, but maybe the it's just the TCM going bad.
I got a P0720 code, I replaced the filter and oil, and vss but it still slips when going into overdrive
According the the all knowing inter-nets….it’s the output speed sensor….don’t know what year or model your Mazda is?
2012 mazda 5
@@jmixzin VSS is at the axle hub…if you replaced that one you would still have the code…as the code p0720 points to “output” speed sensor…it’s atop of the transmission towards the back top part…..VSS and output sensor are the same sensor they just use it in different places and call it different…..diy at your own risk….best wishes
Hello Raul, I changed the 3 sensor but my speedometer still doesn't work, and all my dashboard lights are showing. What can it be? every stared after I replaced my front CV axels.
The VSS sensor is located on the cv axle hub.... So the axle you bought is missing something? Just a thought.... On my car.. VSS sensor is on the passenger side inner axle....
Hey so I'm having mostly dame problem.. code said solenoid 2 stuck.. so I replaced all of them
. Drove around the block Everything was fine.. until I went to leave out again and the AT light was back on.. and still drives just won't shift of 2nd..
Can you please help I don't have a man to help me w these kinds of things, and I'd like to fix this myself w maybe your help.. thx
Hi ..I am sorry I had forgotten my TH-cam password….and was locked out of everything..!!..what year and model of your car…what’s the code number?
@Car-u-fix-it ? it's a 2005 mazda 3 .. it said solenoid 2 stuck.. I'm trying to find my print out to get code #.. I'll have to get back to you.. thank you so much for dealing w all that password bs to get back on here to help .. I really appreciate that
For sure plan on ordering a solenoid once you get the codes..as it’s crucial to know the code so you can order the right solenoid….but you can do it ..it’s not hard…Keep is posted on the code number
I just realized you replaced all the valve body solenoids……!!…then your issue will be a sensor or the pcm…since your car is different than the 2.3 or 2.5L ….
hey guys i really really need help with a Mazda premacy 4DW that only shifts up to 3 gear then my AT light comes on with my check engine light. for some reason my TCM isnt under the battery box. where els can i look? its the same a 2010 Mazda 5.
Premacy? Thats from another country I think....in that case, the PCM has the TCM inside it....or the Main computer module controls the transmission....so you only have one computer module......I would start with the speed sensors first as they are cheap....
Please try to test the speed sensors first....I dont assume no responsibility but I hope it helps
Is there a way i can see the wiring of the rear diff output vss sensor,mine got its wires ripped out
Will try but I am at the dentist at the moment
@@car-u-fix-it8070 appreciate it,sorry for spam,my email is: skylerchristiansen01@gmail.com
Hey my dad is trying to change his but they charge like 130 for the piece, is that the normal price for the speed sensor?
I ordered mine from eBay and it cost me $16 dollars….it’s the labor that costs a lot…if he can do it himself it would be best….
At dealer it costs about $40 to $60 dollars….order it online then have a mechanic change it…be cheaper…but repair at your own risk…I have to say this for legal reasons…
Can you show me a diagram for the F selinoid electrical
Hey Efrain..I am sorry I don’t have one
Do I clean the VSS sensor with brake cleaner of MAF??
I cleaned them with CRC electric cleaner…but MAF would be ok I guess….FYI My suggestions are just that, clean at your own risk…sorry I have to say that legal crap now…
@@car-u-fix-it8070 how did you remove the top two sensor? The connections. I got the rectangular looking one out but I'm having trouble with the circled one. Edit: Nvm I got it
@@weisoman5323 how were you able to get the whole round one out mine spins in circles and pushes inwards on me but won't seem to come out and I'm a lil nervous maybe I busted something in my trans pushing it in a little bit but I'm not sure? I'm having fluid leak from all around the while round sensor.
What were your codes
Hey I have an output speed sensor code. I’ve replaced all the sensors and the tcm. The car won’t shift into 5th and the code reader computer won’t get a reading for the oss rpm and the vss speed.
There is a speed sensor on the driveshaft next to the transmission wall...have you replaced that particular sensor? The passenger axle next to trans wall....
Yep that one was replaced
@@car-u-fix-it8070 wiring was checked completely and everything is coming up perfectly fine. No open or bad readings. I am fully dumbfounded
@@dannymanuel1177 did you replace the cv axle sensor?
@@car-u-fix-it8070 which one is that one? I’ve changed the one near the bottom of the trans and the top ones.
Where is the intermediate shaft speed sensor located?
Top sensors are input and output......the only sensor that is close to or on the shaft is the VSS sensor.....center of car underside....so raise the car and crawl under and look by transmission mount....its in one of my vids...but I dont know your year/model....use jack stands for safety....glasses all that safety stuff
Thank you!!
Hi, do you have the part number of the output speed sensor? It look a bit different than the input one, but I can't seem to find the OEM part number online
Fn12-21-551a
@@car-u-fix-it8070 This part number came up as OEM speedometer sensor. Is this the same as the output speed sensor?
@@liang2512 hi Laing…it’s best if you look up your year and model off of vin number to be exact…best to you
@@car-u-fix-it8070 Hi, I checked with my local Mazda dealer with VIN of my car and they gave me same part number FN1221551A. But they weren't able to confirm to me if this is input or output sensor, just says it sit on the back of the transmission and there is another called turbine pules generator with part number FN0121550 sits on top of the transmission like the one you replaced in your video. Is the one you replaces in your video the input sensor?
Thanks
@@liang2512 it’s the output and VSS …yes it sits at the back of transmission axle right at the place where the axle meets the transmission….that’s the VSS….output sits on top of transmission towards the back..(top back) turbine is the input sensor and much smaller….just buy two of them on eBay and change them both…
Is the output and vss are the same sensor?
william maradiaga ...Same type of sensor...yes but two different locations...VSS is on drive shaft and output is atop transmission. Same crap..I ordered three vss sensors just in case any went out
Raul Repreza Thank you ..
I have another question. I have a Mazda 3 2010 and I have the ABS the brake light and the speed meter don’t move just the rpms
wow ...sorry but i dont have a clue...abs sensor is out.? water might have ruined your sensor?
I have an intermittent at light and slipping
Codes?
Raul Repreza not as far as i saw on my obd2 . I checked on my scanner but probably . Today it slipped 3 times . Once in 5th gear and another two times in 2nd
How many miles,? And have you changed trans fluid...... If no codes, maybe it is the trans bands worn.... Try Lucas trans slip.... Half a bottle down the dip stick.... I have done two trans fluid changes 10000 miles apart and the stinking OE fluid($16 per quart) came out ugly... I got 80kmiles on mine....lets hope it's a bad connection.....
Raul Repreza im at 120k miles , never changed fluid but never had an issue. AT light comes on. Im gonna get the mechanic to scan it he loves Mazdas he prob has an extra TCM
Well, hope it's just a solenoid as they are cheap and easy to fix.. Or a sensor...
AT light on a mazda 6 I and no reverse
4 cylinder or 6 ? What uear
@@car-u-fix-it8070 it's a 4
@@car-u-fix-it8070 2008
What are the codes? It sounds as if it’s in limp mode….could be the tcm or a solenoid…scan for codes and it will be easier to pinpoint the issue….if you don’t have a code reader just borrow one from autozone or oreillys
@@car-u-fix-it8070 I have 4 codes p0500 u0155 p0301 p0757
Anyway I can message you need help
With mine
Hello, Sure what’s up?
@@car-u-fix-it8070 I have codes p0500 and p0715. On my 04 Mazda 3 I need help finding parts online. It’s a vehicle speed sensor and input turbine speed sensor
I believe you need: input speed sensor and output as well....they look the same as mine....but do you have a 2.0 or 2.3L
Never mind they are the same for both years...rockauto.com has both...input is $9.80 and output is $29 but once you look at the pictures...go to eBay and type input speed sensor for your year and model and you will see each sensor super cheap...both sensors are located on top of transmission and you get to them by removing air box and a few other stuff...not hard....use CRC ELECTRICAL cleaner and clean areas where sensors are located
Also use dielectric grease inside inside each new sensor just a finger tip...it prevents water/grease from messing with sensor
Hi what is the name sensor you say in ebay price 56.00
56 bucks for all three sensors input, output and VSS.... Each cost me about $16 to $18 a piece...
Never buying a Mazda ever again, this pieces of crap fomoco transmissions totally Suk#^#^
Why didn’t you just diagnose it instead of shotgunning parts. DYI guys….
Well…don’t know what to tell ya…read codes and all…got half right…and I just decided…all is going bad so just replace the crap
My 2010 Mazda3 will not shift into 3rd, 4th, or5th. Mazda has had it for over a month. They replaced the TCM, all b modules and the internal solenoid wiring harness and it is the same as when I took it in to them. They have no clue as to what is wrong. Still shows that the b solenoids need to be replaced. Any idea as to what is wrong?