Thanks a lot PJ, and welcome back in 2021! I’ve used the simple voltmeter on a power probe to determine Comm presence on a circuit before. Nothing critical to be determined.... simply looking for a variation of voltage and the appropriate level of said voltage fluctuation. Seeing you use the simplest of diagnostic tools, a test light, should encourage most of us not to be intimidated by Comm circuits.
I have a friend, Darrell who uses his power probe to verify signals to audio speakers. He says that you can play the music through the power probe speaker. I haven't tried it myself, but I want to!
@@VoltageDropDiagnostics i actually used my old school SnapOn Vantage meter to test for audio signal. Posted a very simple video on my channel. Good to see you posting again
Excellent stuff Pat, I appreciate your time putting this together for us. Really awesome to see a new video from you my friend. Keep up the great work man, really loving the teaching you are doing!
I have not run across any comm lines shorted to power or ground yet but that was one of the variables that I may have missed, using the test light on the comm line. I have a class coming up on communication networks Thanks for taking us along on the diag! Happy New Year too😃
Check powers and grounds is like a mantra for auto techs but,,,checking the function first may rule out a power issue. When your 3rd test, 1st data test, showed that the module was sending data, the power and ground were verified. Doing that first would show that power is present.
I can agree on a simple module like this. But if we are working on an ECM that has multiple power inputs, we dont know which power feeds control what part of the circuit board. I do see what you're saying. But for me, it just feels safer to quickly test them.
you prolly dont care but does someone know of a tool to get back into an instagram account? I was stupid lost the password. I would appreciate any tricks you can offer me
@Eden Ty Thanks for your reply. I got to the site through google and I'm trying it out now. Takes quite some time so I will get back to you later with my results.
Cool diag, PJ! Never seen a wireless ECU failure before...must be a Toyota thing. Is that single wire comm wire a one-way street or bi-directional? I would assume bidirectional since you can program it with the scanner...Must be a sensing circuit in the wireless ECU similar to the Main Body ECU then?
Thanks for your everything..i have a 10 toyo highlander with a burnout smell of alternator and not charging..alt replaced..problem solved but there is no sound comming out of stereo there is a normal display of radio station but no sound i check the fuses underhood and left kick panel no luck have you seen this issue thanks..
I learned a lot as usual!! Really enjoy getting to go along with u on the diag. Would I have been able to do the programming with my Diagun, or would I need your Toyota wizard machine?
That’s a good question. Off the top of my head, I’m not sure if the diagun specifically would program the TPMS sensors, and the key fobs. But i do know that “most” bidirectional scan tools would have been able to program them.
@@VoltageDropDiagnostics I have a Verus and an old MaxiDas. And an Autel Tpms tool. So I would just keep throwing tools and maybe one would hit the target. 😂😂
I had a tundra a while back that would lose all four Tpm sensors. I knew it was the antenna or receiver but never could catch it in the act:( sadly, i never fixed it.
Awesome video ! Would you say that signal is sort of a bias voltage ? Also this failure is common on Subaru’s as well . Keyless access will be inop along with a tire light and no comp with the module .
@@VoltageDropDiagnostics pretty green on bias voltages riding on top signals , ill have to read up on that some more . This is why i love this field always something else to learn and study up on . Looking forward to more videos !
Hi i have a question for you, when you were checking the powers and grounds at the module, was using the test light the best way or would using the multimeter be a better solution incase there was voltage drop you could see it using the meter. Or are you comfortable using the test light that you would notice it dim in the case of voltage drop
I understand this video was 2 year ago and you may never respond to these comments. But I had one more question, when you used the test light to pull the com line to ground. It never lit up the test light, is that becuase the internal resistor in the computer was much greater then the test light?
So, the problem with testing powers and grounds at the module with a multimeter is that you dont know if the module is loading the circuit. Circuits should always be loaded when theyre being tested. So a multimeter is good. But a test light will actually load the circuit. Check my latest video.
Thats exactly it! Communication circuit have internal resistors that usually have relatively high resistance when compared to the test light. So when the test light is connected to ground you're essentially safely shorting the circuit to ground.
I have a 2012 Toyota Corolla and it seems that I have to push the button on the remote pretty hard to get the doors to lock and unlock. Any ideas on what that could be? Lmk.
No way is that a stupid question! That’s actually a great question! Imagine the module has a resistor in the circuit. But the resistance of that resistor is extremely high. Remember, as resistance goes up, amperage goes down. The resistance is so high that there isn’t enough amperage in the circuit to light the test light.
@@Ahmed-rp2ve yeah! For sure lol But some systems look for that circuit to be complete, and if it isn’t it will turn on another different light lol I’m not sure if that’s the case with this though lol. If it is, I’m sure you could always solder a resistor in place lol
Hello, I am the manufacturer of LED lights and like your video on TH-cam. Would you be willing to test our led lights? Please let me know how to contact you if you are interested.
The diagramed help understand what's going on. Thanks Pat.
Thanks! I know it looked like scribble lol
Finally, the end to my Voltage Drop Diagnostics withdrawals! Hope you and the family have been doing well, PJ.
haha! I have a tundra ECM to repair. I might film that and release it soon too
@@VoltageDropDiagnostics Now you'll have me watching for that!! 😁
Thanks a lot PJ, and welcome back in 2021!
I’ve used the simple voltmeter on a power probe to determine Comm presence on a circuit before. Nothing critical to be determined.... simply looking for a variation of voltage and the appropriate level of said voltage fluctuation. Seeing you use the simplest of diagnostic tools, a test light, should encourage most of us not to be intimidated by Comm circuits.
I have a friend, Darrell who uses his power probe to verify signals to audio speakers. He says that you can play the music through the power probe speaker. I haven't tried it myself, but I want to!
@@VoltageDropDiagnostics i actually used my old school SnapOn Vantage meter to test for audio signal. Posted a very simple video on my channel. Good to see you posting again
Excellent stuff Pat, I appreciate your time putting this together for us.
Really awesome to see a new video from you my friend.
Keep up the great work man, really loving the teaching you are doing!
Thanks buddy! Hope you have been doing good!
@@VoltageDropDiagnostics oh yeah, just hamming some chain jobs brother 😉
I have not run across any comm lines shorted to power or ground yet but that was one of the variables that I may have missed, using the test light on the comm line. I have a class coming up on communication networks Thanks for taking us along on the diag! Happy New Year too😃
I had one once. It was my scan tool (a mongoose cable) that was internally shorted! Through me for a huge loop lol
Nice video PJ. Well done with your online class.
Thanks!
Always great to watch a diag !
Thanks!
Man you, phad and sma all on the same day? Gonna be a good day for watching some videos 😁
hahaha I think SMA released 2 videos, too lol
Check powers and grounds is like a mantra for auto techs but,,,checking the function first may rule out a power issue. When your 3rd test, 1st data test, showed that the module was sending data, the power and ground were verified. Doing that first would show that power is present.
I can agree on a simple module like this. But if we are working on an ECM that has multiple power inputs, we dont know which power feeds control what part of the circuit board. I do see what you're saying. But for me, it just feels safer to quickly test them.
Million thanks Pat
Thank you!
Great video PJ. Good luck in 2021
Thanks! Good luck to you too!
Excellent work as always PJ
Thanks!
That helps tremendously, thank you Pat.
Great work PJ, really good explanation on the diagram to help others understand the system. Keep up the good work
Thanks Cody!
Killer video. Thanks for the tip!!!
Thanks Gera!
PJ, awesome/ good information as always is this universal approach to fix this issue with other make and modules thanks and happy new year brother.
This will work to diagnose similar systems on other makes and models, yes
Great training video, thanks for the top diagnostic tips cheers sandy
Thank you!
Thanks for sharing PJ. Very informative and the drawing does help
Im glad the drawing helped lol I felt like I was scribbling. But its hard to draw on an ipad with just your finger lol
you prolly dont care but does someone know of a tool to get back into an instagram account?
I was stupid lost the password. I would appreciate any tricks you can offer me
@Kylen Kason Instablaster :)
@Eden Ty Thanks for your reply. I got to the site through google and I'm trying it out now.
Takes quite some time so I will get back to you later with my results.
@Eden Ty It worked and I actually got access to my account again. Im so happy:D
Thanks so much you saved my ass :D
Thanks Pat! Great video and diagram/explanation of system and solution.
Glad you enjoyed it!
Very informative. Great video
Glad you liked it
Thanks for the explanation.
great video 👌.however it would have been even greater if you had shown the programming of the tpms.
I have a video on that. Check the channel for it.
Great to see you PJ!! Hope you and your family are well! Happy New Year!
Happy new year!
Great video man! Super helpful and well explained... hope everything’s going well! Can’t wait for the next one 💪🏻
Thanks buddy!
Cool diag, PJ! Never seen a wireless ECU failure before...must be a Toyota thing. Is that single wire comm wire a one-way street or bi-directional? I would assume bidirectional since you can program it with the scanner...Must be a sensing circuit in the wireless ECU similar to the Main Body ECU then?
NVM missed the second comm wire...so one input and one output :)
Thanks for your everything..i have a 10 toyo highlander with a burnout smell of alternator and not charging..alt replaced..problem solved but there is no sound comming out of stereo there is a normal display of radio station but no sound i check the fuses underhood and left kick panel no luck have you seen this issue thanks..
I learned a lot as usual!! Really enjoy getting to go along with u on the diag. Would I have been able to do the programming with my Diagun, or would I need your Toyota wizard machine?
That’s a good question. Off the top of my head, I’m not sure if the diagun specifically would program the TPMS sensors, and the key fobs. But i do know that “most” bidirectional scan tools would have been able to program them.
@@VoltageDropDiagnostics I have a Verus and an old MaxiDas. And an Autel Tpms tool. So I would just keep throwing tools and maybe one would hit the target. 😂😂
@@billrimmer5596 i know for sure the verus would have been able to do it. Lol
Thanks PJ! Do you know the Toyota part number of the receiver in this video?
thanks!!!!
About time you do a video, if you want to get views do more man
I had a tundra a while back that would lose all four Tpm sensors. I knew it was the antenna or receiver but never could catch it in the act:( sadly, i never fixed it.
great video,thanks a lot,what kind of a tester you have for testing key fobs?
Thats a "key tool max" sold by xhorse
Thanks for sharing... Cheers.
Thanks for the visit
what is a c2126 for then? TPMS sensors test fine and status is all green.
Awesome video ! Would you say that signal is sort of a bias voltage ?
Also this failure is common on Subaru’s as well . Keyless access will be inop along with a tire light and no comp with the module .
Im not sure if I'd call it a bias voltage. Generally a bias voltage is used and a signal will ride on top of the bias, sort of. Right?
@@VoltageDropDiagnostics pretty green on bias voltages riding on top signals , ill have to read up on that some more . This is why i love this field always something else to learn and study up on . Looking forward to more videos !
Hi i have a question for you, when you were checking the powers and grounds at the module, was using the test light the best way or would using the multimeter be a better solution incase there was voltage drop you could see it using the meter. Or are you comfortable using the test light that you would notice it dim in the case of voltage drop
I understand this video was 2 year ago and you may never respond to these comments. But I had one more question, when you used the test light to pull the com line to ground. It never lit up the test light, is that becuase the internal resistor in the computer was much greater then the test light?
So, the problem with testing powers and grounds at the module with a multimeter is that you dont know if the module is loading the circuit. Circuits should always be loaded when theyre being tested. So a multimeter is good. But a test light will actually load the circuit. Check my latest video.
Thats exactly it! Communication circuit have internal resistors that usually have relatively high resistance when compared to the test light. So when the test light is connected to ground you're essentially safely shorting the circuit to ground.
great diag iam a mitsu tech
Nice! And thanks for watching!
I have a 2012 Toyota Corolla and it seems that I have to push the button on the remote pretty hard to get the doors to lock and unlock. Any ideas on what that could be? Lmk.
Honestly it just sounds like the key fob is starting to fail. But I wouldn't know without testing it
@@VoltageDropDiagnostics could it be the battery in the key? Lmk.
Stupid question...how come if its a signal 12v it won't illuminate a test light?
No way is that a stupid question! That’s actually a great question!
Imagine the module has a resistor in the circuit. But the resistance of that resistor is extremely high.
Remember, as resistance goes up, amperage goes down.
The resistance is so high that there isn’t enough amperage in the circuit to light the test light.
Completely forgot about the resistor. Was just focused on 12v + ground...thank you!
@@urahaman1479 no problem!
I only break the flash light on dash
Did you program new keys or re registered old keys?
Registered the old keys.
I have a question
Can i cancel the TPMS module or turn it off?
No, unfortunately not that I’m aware of.
@@VoltageDropDiagnostics there is the (turning the bulb off in the dashboard) option 😅
@@Ahmed-rp2ve yeah! For sure lol
But some systems look for that circuit to be complete, and if it isn’t it will turn on another different light lol
I’m not sure if that’s the case with this though lol.
If it is, I’m sure you could always solder a resistor in place lol
Hello, I am the manufacturer of LED lights and like your video on TH-cam. Would you be willing to test our led lights? Please let me know how to contact you if you are interested.