Jeep Grand Cherokee - Check Engine Light P0141 / P0155 / P0523
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- เผยแพร่เมื่อ 13 มี.ค. 2016
- Let's have a look at this 2004 Jeep Grand Cherokee that has the engine light on with codes P0141, P0155, P0523, and was brought to us by the customer who had it at another shop. Let's see if we can figure this one out for him!
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Due to factors beyond the control of South Main Auto Repair, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. South Main Auto Repair assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. South Main Auto Repair recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video. Due to factors beyond the control of South Main Auto Repair, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained in this video is the sole responsibility of the user and not South Main Auto Repair. - ยานยนต์และพาหนะ
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My favorite type of SMA videos are when the problem seems simple at first then you look and see the video has 40 minutes left. You know it's gonna be a good one!
+Chad Bob Oh man seems to happen all the time!
You are an honest and honorable mechanic, a rarity nowadays!
Yes he is!!
But he knows he’s filming and the rewards his subscribers give him; he deserves it but if it weren’t for TH-cam, he may not of even made a living in his location
With the age and mileage of the jeep and you attempted to make the proper fix, the cut and splice was well justified. It just adds more caricature to the vehicle!! Great Job!!!
Same oil pressure set up used by Ford and many others. Market research showed that buyers wanted the gauge and not an idiot light, so in Fords case they switched over and installed a real gauge. However, many folks had never seen how an oil pressure gauge actually works. They got worried about that gauge rising/falling and being higher when cold / lower when hot. The result was to install a resistor wire to feed the gauge on the panel and replace the actual sensor with a switch. The resistor pops the gauge right up as soon as the sensor detects oil pressure, and it stays right there nice and steady. Customers were happy, they had a "gauge" Ford wasn't real happy but they did alter the design of the dash board, they ALL had the resistor in them from the factory! How long ago did this start? Well let's just say that if you own a Ford, it likely has an "idiot gauge" in it.
The first TSB came out in 1988 on the Ford F-Series, and it quickly spread to everything Ford made. You get a real oil pressure gauge once you get up to the super duty WITH a diesel.
On many Fords the water temp is the same way....
BUT before anyone of the other brand owners start bragging, They do it as well. There are some out there with real working gauges, but many are just a pretty idiot light...
OH most switches are set from 7-11 psi ! (and are amazingly interchangeable as long as they use the same threads)
Thanks for the info, seems like I'm the last to know of this silliness. Snap-On plays too then, how very stupid. We can keep this a secret I'm pretty sure...
Gas gauge on 2001 F150 won't show real time data, you have to shut off the engine and then start it back up to see how full it actually is - instantly too. Two hours with engine running otherwise before it gets to full mark. They don't want us watching the gauge while fueling, how anal does it get?
+Lee Barnes The scan tool can only see the data the ECM sends it. Real time oil pressure isn't a "needed" item, just that the engine has oil pressure. However ECT is a needed item so there will be at least one real temp sensor on there.
That's so silly though... who would want an oil gauge on a non-performance, non-heavy-duty vehicle? -and, if there is one, would worry about it not reading a fixed value?
I'm learning a lot about cars from watching this and other channels, but even before, when I just put petrol in and took it to the dealer at regular intervals, I realised things like oil and waterpumps are driven off the engine, so their functioning will change with rpm and stuff. I mean, the only thing about oil pressure that's 'pull over right now and call break down assistance' is an unexpected drop while going down the road, right?
+Jan Verschueren, not here though. You are entitled to your opinions and preferences, but I want to watch the actual oil pressure over the entire life span of the engine in order to determine the little things like when I'm down two quarts in my suby the oil gauge goes spongy to relate it as best as words can. I know I have but a few scant miles to go before I should pull over and dump two in -- on MY schedule and not in heavy interstate traffic which is hazardous to all living things. You are forced to call AAA and I don't want any part of that. I've GOT the oil with me you see. Give me all the information so I can become the master of my own destiny in other words.
Blazer02LS
You are correct... Mazda did this in the Miata and I assume other cars. 90-94 got a real gauge that moves. 94 to 97 is an idiot gauge... although it's not just on and off. there is some small changes seen. Same with the temperature gauge. it move a little bit in the middle... for the same reason you said. people freak out when the needle moves a bunch.
05 in the 3rd gen they went back to a moving gauge... but even it's fake. it moves a lot. but is the ecm calculation shown on the gauge... not the real pressure.
it's actually annoyed in that gen car. it wildly swings around with RPM.
my guess on the Jeep.. they had a ton of gauges used in other stuff. so rather than redesign the dash layout, they used what they had and made it work
I honest don’t watch car repair shows but feel asleep and woke up watching your channel then got hook not only you’re a good mechanic your also interact with the viewers ! I’m hooked
Now it all makes sense...I have a 97 Dodge Ram and the dash gauge never changed it's reading no matter the RPM. I decided to install a mechanical gauge, and of course, it changes value with RPM. Thanks, Eric.
+Rich 372 Problem solved!
Your diagnostic skills are phenonminal. A pleasure to watch you work. Im learning stuff from you. Thanks!
Yeah, learning stuff I hope I never have to use.
Handle like a top notch Tech. Perfect diag, thorough and the O2 plug? Perfect repair.
Dude you are one of the best mechanics I have ever had the pleasure of watching. I been doing this for 25 years and run my own shop now. The way you approach things is spot on
When I saw that fender rust and the drifters stitch on the bumper, I knew it was going to be a good video!
+***Classified*** Lol
FYI, connector pins and connector housing.
Great job Eric. Good diagnosis and practical solution.
How do half assed shops stay in business is beyond me ? Fantastic work eric. The few the proud the true mechanics.
+Aleksandr Pokrachinskiy Many of them are doing very well in our area
Shortage of mechanics and outrageous dealer rates is how
Bradford Ramm well and u gotta think a lot of work they get is simple shit like break work tie rods radiators so they make their money but then diagnosing issues shops don’t care anyone can do easy shit diagnosing is why people like mechanics until they throw parts at ur car
New to the channel but have watched a bunch. I think I found a top 5 favorite, “there’s your problem lady” in the first 6 mins but then you see you’ve got another 45 left + a rainy trip to salvage Nirvana, it’s a great day. Throw in some brake clean from Hanna and you’ve got a perfect 10. Also, Dr. O, it’s nice to know there are excellent honest Mechanics out there.
Your one of the top mechanic / diagnosics guys who shares the good, bad and ugly and I sure appreciate it. As always, "top notch video" (as Steve Rob would say).
+wyattoneable Haha oh that Steve.. no he is one premium guy! Lol Love that guy
Top work, Eric and IMO the fact that you tried to get the correct wire and Jeep let you down and you hunted for a replacement shows what you did as a totally viable repair, with the connectors. Lets face it customers need there cars back!, and as always I am happy to learn something new.
Now I know why my oil pressure is always the same on my WJ. Thanks for sharing. Cheers from Jacksonville Florida 🌞
Remember - If you can't do it, nobody can do it.
How trues that
Yep
Was nice to see you got all out back yard mechanic there for a while n splicing that O2 in. That beast has so many leaks and rust. Geesh!
Eric, never apologize for an honest repair. Cars age and parts become scarce.
My neighbour has this same car, when I told him about the gauge, he lost his mind!
"Send me the link to this charlatan" I think you will soon have a new subscriber. Love it!!
+toroon01 Davis Hahha had to ruin his day huh?
As you've said before "sometimes better to be lucky than good". Today you were good! Can't be lucky all the time. Sometimes the right attitude and motives are better than the right parts. I have absolutely no problems with that fix, great job, as usual! 😁
Great vid Eric, loved the trip to the junk yard.
EI EI O.... The I stands for Integrity... no doubt in my mind... I'll keep watchin' !! and thanks for setting a great example too !
At 3:50 - The scene: Sun is shining, doors open, Jeep on the lift and a dog in a bed watching the world go by. That's a pretty good life.
I've been doing the shade tree wrench turning for quite a while and I like how methodical you are on your diagnosis. excellent stuff. and don't kid yourself, your catch phrase,"if I can do it you can do it" is incorrect. it takes a technical mind and thoughtful approach to troubleshoot the way you do. hence the reason you seem to get a lot of rigs other so called mechanics can't fix. not everyone can do this stuff. good work young man.
Awesome info about the Oil pressure switch ... Very useful data to have, I have questioned why my pressure never varies...
You are a true home town mechanic, You keep people moving 👍👍👍👍
I bought the actron ...love it
I've watched several of your videos. Very informative. Thumbs up to you.
Lol at the dog in the amazon box. You seem like a humble dude if I lived in NY you would be my mechanic.
Much respect for your skills and knowledge brother!
im consider my self a tech.i work in the GM dealer sheep here in tamp fl .i wold say i watch you channel probably every every single day if not every other day. i learn a lot from you, and we have kinda identical tool collection. keep it come man you have know idea how mach you helping people out there
Priceless information! Thank you!
Eric O. your a car fixing stud dude!
Have soldered wires to old pins where not available,and wire broke at connector ,reuse weather seal,I work on salt trucks and most my repairs are wires and connectors, keep up the good work, coby
I have the Actron CP9580 which is very similar to one you have. Fine for a DIYr like myself.
Annual emissions and safety inspections in MA, $35
Thanks for the videos!
Great mechanic Eric, super repair on the old girl.
All the WJs up until 2002 or 2003 had a real sensor that would read pressure and when they switched to a dummy switch they didn't want to reconfigure the cluster so people didn't think they "lost" a feature. It was done to stop complaints to the dealership of low oil pressure since it is hard to explain to the customer that it is normal when the vehicle is hot on a hot day to have a lower pressure at idle. LOL
Thank you for all the info you have shared
my 1997 jeep 4,0 still running great at 350,000 miles
Great Video! My 06 Nissan Frontier V6 has the same oil press sender "SWITCH" system.
Great work customer should' be so thank full good to a real shop doing real work Amen job well done
Cool black and white retro looking video intro.
+Paul Carroll Thanks Paul
Job very well done
Thanks for pulling out the Actron! Got one ordered...
+Scott Wyant Handy tool
I love that Chrysler vehicles make retrieving codes so easily (keying on and off 3 times). Probably the reason why Ive been diving them since 2000 (4 Jeep Grand Cherokees all with 4.0 til 2019, now a Durango and Dakota both with the 4.7. Nothing newer than 2003 😉
That's the last year Grand Cherokee that came with solid axles and the inline 6. I am always looking for a nice one I get out a few more miles on.
Completely valid repair on the harness, have to do it many times before. Some connectors are just not available. I get terminal pins from Oreillys, there made by BWD. You can pretty much get any manufacturers factory pins. Most come with new weather washers also. Come in boxes of 10, 25, 50 and 100. I love going to the salvage yard!!!!! ;).
+Emt Scythe The salvage yard id my fav place to go... beside home
Another good video, thanks for sharing, I was in the automotive repair/education field from 1980 - 2006 I really like your approach to your trade.
Thanks +John Christopherson
We need more Master mechanics like you!!
Congratulations Eric!!!...good Fix!!!....sealed...no water or moisture!!!!....solid connection!!!....o2 sensor super ready to go off-road...hard!!....about oil indicators!!!..There are many kinds!!!!...regularly what is comonly called "oil pressure switch" only drives a 12v beam on the dash (single wire switch)!!! when engine is off and key on!!..no oil pressure, beam is on (the switch provides ground from the engine block)!!...when engine runs, oil pressure is build and beam is off (because the switch is open by the oil pressure)!!! simple in the old days...but...from what I know (very humble opinion) always when there is a gauge, the oil pressure unit must be a "variable resistor unit" no matter if it has one wire or many wires. There are many oil pressure units that senses oil presure with only one wire!! In this type (one wire only) when Engine-off-key-on, the gauge works in conjuction with the resitor value of the unit on the block, and provides a minimum value of ohms, nearly ground (always pushed by a calibrated spring). When engine runs, the unit on the block reports higher value of ressitance, then this device is building a voltage between 0 (from engine block ground) to 14 volts (from the ignition key). the gauge resistor values are choosen to work with this, and reports on the dash a value from 0 to 14volts (converted linearly to psi oil pressure) and the PCM only manage the info in units of volts/psi!!!...In my wild guess, that car should use "one wire only variable resistor-oil pressure sending unit", insted of and old-school 12v beam oil pressure switch (like the one it has)!!!....sorry for the tons of words I droped on this!!!... Hello to everybody at SMA!!! :) :) :) :)
Another great video. Thanks again!
Nice work my friend. Love you videos
nice fix. interesting dummy oil pressure sensor info
Eric on my 1999 Jeep Grand Cherokee which has the 4.7 I think my Grand Cherokee Jeep uses a different style of oil pressure switch because on my Jeep you can see it go from high to low , as far as the wrecking yard I like your Wrecking Yard a lot better than the ones we have out here in California we have to go to wrecking yards that have all the cars are on 4 stands and on your wrecking yards there just a lot alot better , keep up the great work .
GREAT job Man......& don't worry about the splice !!
I really enjoy your videos. As for finding a compatible connector for the oxygen sensor from another vehicle, if you search for an O2 sensor at our favorite Irish auto parts store, they have a compatibility tab to see where the part is also used. In this case, they show 82 other vehicles which use the same O2 sensor. Additionally, for parts compatibility, there are Hollander manuals.
+johnwrench4speed Yeah that is what I usually do, I just use the one on the Napa prolink site
Thanks Eric.....I like the whiteboard.
+AUTOMAX Thannks man
On the oil pressure sensor you are correct. On the dash on Jeep's and Dodge Dakotas I know for sure are also like this. They indicate on the dash but not corresponding to oil pressure. I come across one failing intermittently it would indicate on the gauge a on - off type indication bouncing from absolutely no oil pressure indicated straight to somewhere around the middle where they all run. Repeating this same malfunction. Testing with a vohm didn't match the on - off fation the guage was carrying out. Yes I guess its a Jeep thing. Another goofy deal
My 1991 Ford Ranger had one of those "placebo" gauges. It was connected to an oil pressure switch via resistor so that the gauge would show mid-high when there was pressure, and pegged low otherwise.
+hoppes9 Change the resistor to get the pressure you want haha
Nice work!
Another great vid Eric.A sincere thanks to you! I was very uncomfortable when you continued to work without covering the "small parts aspiration ". I'm still a little shaky....
love the new intro
If we get temperature that good in August we are lucky.Another great video.
.
+LR Disco Pretty toasty here for spring let me tell ya
Wow... Dummy oil pressure gages...
About that fix, Eric. I just have to say that I am very...
Ok with it! Hey, it has to be fixed somehow and while it is not a connector, it is allowing it to do it's job. A-OK in my book! Thanks for the video, Sir!
That explains why my cherokee has 2 pins in the oil pressure sensor but the one in the grand cherokee motor I'm swapping in it only has one. I thought the pin got pulled out. Guess I better swap the old sensor in to get a proper pressure reading. BTW, I just found your channel and love all the troubleshooting and explanations. Please keep it up!
Actually if you are already in the junkyard ANY 4 wire plug will work just take BOTH sides male/female and you're good to go .
I'm surprised he doesn't have any Superseal or Deutsch plugs in stock, those are great connectors, never had any problems with them and we have similar conditions to NY where I am. The Deutsch connectors are kinda pricey though. Superseal works just as well, but Deutsch is more industry standard, well over here in the Yurops anyway.
The whole reason to worry about a connector or a hard wired o2 sensor is for the next time changing it. If you replace both sides with another type connector, you will not match up with the new O2 sensor down the line.
Great video and great fix. Well done.
+Dennis Wilkinson Thanks
Really like the new intro. Keep it fresh and interesting.
You made more effort to do it right than most would.
for a small town you have a NICE parts yard ! :)
It's nice to know some things never change. When I was pulling wrenches we all knew that the AMC Jeeps were crap and no one with a lick of sense would buy one. So now we've had the Chrysler Jeep, the Mercedes Jeep, and finally the Fiat Jeep and they are still crap. My daughter bought one without my knowing about it. It lasted long enough to get off warranty without giving her any grief. After warranty.....that's another story.
great intro!
Chrysler didn't like that people were getting upset that the vehicle "didn't" have oil pressure at idle when hot. Since less than 10 p.s.i. looked "bad" on their REAL gauge they faked the oil pressure gauge to look like you always had a WHOPPING 40 P.S.I.! Atleast that's what I read and honestly it makes sense. I had a 1999 grand Cherokee that acted the same way and I was dumbfounded till I realized it was fake news. Love your work Eric! Keep it up.
if i remember correctly, jeep have a body control module, this part regulates the negative current. and the processing control module regulates the positive current. the idea is to make the wiring harness much simpler, how it works well you can tell by your writings on the white board.
all good
It'll run, no need to waste time. I have a kit of 1-6 pin weather packs at the house for that reason. Yeah, both sides have to be replaced, it's not factory, but it works for backyard wrenching.
Love the white board of knowledge segments, my Ford is the same, has a gauge but it's just an on/ off switch . Like the idea of phoning Ivan , I'm going to start doing that too. LOL
+STEVE ROB Sure, feel free to call him any time, especially after midnight haha
Love the repair. Gotta do what you gotta do. I know the o2 sensor would outlast the car but I would've preferred to add Male and female connectors so IF something goes wrong I can fix it. Just my little opinion
I enjoyed the video! I have the dreaded P0420 on my 02 Subaru Outback H4. I'm using an Open Source Scan Tool called Romraider. It's not as nice as your scanner, but I think it will do the job if I can learn how to use it. The thing I like about your videos is your approach to troubleshooting. You break it down into its simplest parts and logically work through the problem. Personally, I appreciate that you rewired the O2 sensor they way you did. No it's not spec, but you did the best job that could be done with the resources you have. And you got that Jeep back up and running! I watch your videos because you have the experience and knowledge of automotive systems. And most importantly, you can transfer that knowledge to the masses. Even though I don't know you personally, I feel confident to work on my vehicle--even in really hard to diagnose problems. As a side note, I'm putting in my application at a Subaru dealership for an entry-level Lube Tech job. At 49 years old, I want to start a new career as an Auto-tech. Thanks for the inspiration!
P0420 on a sooby is pretty common. Especially at or around 150k
Figures. I'm at about 173k. OEM Cats are ~1k. If the Cat turns out to be bad, is OEM my only realistic option?
100% OEM only on those, trust me I have been down that road. Aftermarket will not work!
As the owner of two pristine '04 Grand Cherokees, I'd love to figure out how to make the "idiot gauge' function so that it reads actual oil pressure. A video on how to do this would be MOST welcome!
I'm a fairly new, very enthusiastic fan of SMA.
Another SMA thumbs up video! At 27:32, the likely reason the Jeep does not have a real oil pressure variable gauge is that the readings would freak out the average person. Oil pressure ranges from 10-15psi at idle to 70-90psi at 3,000 rpm. Imagine how the average person would react when they are watching that gauge, come off the highway and stop at a traffic light. All the average person needs to know is whether they have oil pressure.
+Sandbag1300 Yeah I think a simple light would be just fine in this case..
+South Main Auto Repair Yes, I agree. In fact, I had that model Jeep. The next generation model beginning in 2005, that I currently own now, replaced the gauge with an oil light.
And here I am thinking "Why not both?"
Give me a gauge to tell what the actual oil pressure is for those who want to know, and below a certain threshold (7-8 PSI) it turns on a red light which the rest of us can pay attention to.
The human brain is really good at dealing with more information than it needs to make a decision quickly. In this case "So long as the light's not on, don't worry about it".
Oil pressure is a really good way to tell when it's time to get a new engine (or rebuild the one you have, but nobody does that these days unless it's from an older muscle car).
EDIT: These days you wouldn't even need a physical oil pressure gauge, just put the info in the same display that's showing you the fuel economy, time, outside temperature, and stuff like that.
Heck with one more sensor you could have it measure the pressure drop across the oil filter to tell you when to replace the filter instead of just replacing the filter every time you change the oil. Maybe keep that bit for the high-end package with all the bells and whistles.
My 2002 Dodge Dakota 4.7 V8 has a variable pressure switch. Just checked my schematics.
@@SouthMainAuto All the WJs up until 2002 or 2003 had a real sensor that would read pressure and when they switched to a dummy switch they didn't want to reconfigure the cluster so people didn't think they "lost" a feature. It was done to stop complaints to the dealership of low oil pressure since it is hard to explain to the customer that it is normal when the vehicle is hot on a hot day to have a lower pressure at idle. LOL
The winters are getting very short here in Australia as well. It is also very much still summer here with 34 - 36 (93 - 96)deg temps at the moment. Keep posting those great vid's......P.S Nice shirt. JimTheCarGuy.
+Potaka79 Oh man so you get no snow then huh
Minus the automotive connector , that’s the same style oil light switch used on Briggs and Koehler small engines.
yes
thee ol jeep has seen better days. Also liked the beginning of the video with the B&W stills.
+dwoodog Yeahhh....
+Hello World Yeah I am always messin with new stuff. No biggy
I seen that BCM sticker, great rifles.
Overhaulin' is on the TV, but that is on mute and I am watching this instead...
+mrman17 haha nice :)
On the wj's (99-04) the oil pressure sensor reads actual pressure from 99-02. Mid 02-04 reads "on-off" it was in preparation for the next model Jeep without a guage. Hope that helps.
26:24 LMAO, awesome reference EO !!!
Eric, in industrial automation, some two wire sensors have a constant voltage supply and the device varies the current it sinks. Usually they vary between 0 and 40 mA. The application is for long leads or noisy environments. Have you ever seen that approach used in a vehicle?
Your camera work is amazing
hey eric, oil pressure gauge reminds me of a saab i worked on here in the uk, it had a turbo boost pressure gauge showing boost when the turbo was siezed, totaly pointless, great vids keep em comin.
All Grand Cherokees 93-03 use actual pressure data and displays real time pressure. They switched the sensor unit in the Jeep in your video in 04, which is what year that Jeep is according to the grille and fog lights.
Good job
Thanks buddy, really good job.
+Lao Han Tun No prob, thanks
Nicely done Eric. Nice Jimthecarguy t-shirt too
+Badgertronix Haha thanks. Jim is a cool guy. Not as cool as Steve Rob but pretty cool...
No justification needed...kudos for even spending time going junkyard shopping for the connector. Another good vid!
+RlfRottn Hey ya gotta look
I personally think you went over and above trying to find a connector for that O2. What a strange way jeep has of determining oil pressure. I think that would have drove me nuts to diagnose and learn how it worked. Good job as always and I really enjoy your videos so keep'em coming.
+Garlin Willingham Sometimes we need to figure it out.
Hi there Eric i have a helpful hint for you on all zippers rub paraffin wax its used for lots of things like canning candlemaking you can put it on shovels plows help keeping the snow from sticking as much it works as a lub on zippers i hope this will help you out.
keep up the good work....
Thank you I was able to see the plugs on exhuast
Chryslers typically have both an oil pressure on/off dummy switch AND an actual oil pressure sensor. I'm not familiar with the 4.0L specifically, but a lot of Chrysler motors are like that.