WOW !!! WAY OVER THE TOP testing. That is the type of testing the OEM would do in their lab. I would never have imagined a issue like that. I can think of NO ONE that would have spent that amount time and money on the issue. Fantastic job! NOTE: Next time wrap the key FOB with tin foil to shield the key, cheap and fast. A metal cookie can with sealing lid works well also.
I just cant understand why the tpms sensor would wake up the pcm while the unit is off? either way more proof that there are way to many electrical components on these newer vehicles
Because the TPMS module is also the keyless entry/remote start module so it has fused power at all times. Both the key FOB and TPMS sensors likely transmit on the same frequency (315 or 433mhz). So, the TPMS module will detect and analyze the TPMS signal even with the key off. That is my understanding of why it was waking up.
Wow crazy case study! Thanks for sharing! I don't really see the value in the sniffer; you can pull the fuses one at a time like you have to do anyway to find out the ID. It is still a really cool tool! I love the idea of using amp clamps to figure out what's turning on first.
I'm not sure if you heard this part in the video but the second time I ran the test with the amp clamps I had 2 fuses pulling power at the exact same time. The scope I was using didn't have a fast enough sample rate to be able to accurately tell which amp clamp saw current first. That's why I had to buy the sniffer. After using the sniffer I highly recommend all technicians buy one. They are only about $200 and SO easy to use! The problem with CAN bus decoding with a PicoScope is you are limited to 8 pages of code before the buffer runs out of room. That can be a huge disadvantage when trying to figure out a problem like this one. Being able to log over 100K messages before the buffer runs out is SO valuable! Now you can easily see the same ID woke up the buss every time over a period of several hours. That test could probably run about a week long before running out of buffer room. With the PICO I would've had to reset the scope after each time the buss woke up.
Just out of curiosity did you check the current draw over time on a known good truck of same year make and model? just seems strange all 4 sensors doing the same thing... Very interesting 🤔
No, I haven't done a test yet on a known-good truck. So far the customer hasn't had any more issues but it's only been a few weeks since he picked it up. We work on a pretty good amount of these newer Superdutys so one day I will have to give it a try.
Ford and Chevy have the most fragile and unreliable tpms in my experience. I've seen a two year old buick with a sensor that died. Very bad oe quality of an important part that was developed due to a government mandate.
WOW !!! WAY OVER THE TOP testing. That is the type of testing the OEM would do in their lab. I would never have imagined a issue like that. I can think of NO ONE that would have spent that amount time and money on the issue. Fantastic job! NOTE: Next time wrap the key FOB with tin foil to shield the key, cheap and fast. A metal cookie can with sealing lid works well also.
GREAT VIDEO.
That probably would have gone to a technician not equipped as well as yourself and never been diagnosed.
Wow you really went all in to figure out the issue, that was an excellent informative video. Thanks for sharing your experience 👍🏼👍🏼👍🏼👍🏼👍🏼
This was more fascinating and informative than I every could have expected! Thank you!
This should have more views. Awesome
I just cant understand why the tpms sensor would wake up the pcm while the unit is off? either way more proof that there are way to many electrical components on these newer vehicles
Because the TPMS module is also the keyless entry/remote start module so it has fused power at all times. Both the key FOB and TPMS sensors likely transmit on the same frequency (315 or 433mhz). So, the TPMS module will detect and analyze the TPMS signal even with the key off. That is my understanding of why it was waking up.
Ok . U good man. In fact u extremely good.no u at another level man. That was amazing diagnosis.
Great job and perseverance. Are you a member of diagnostic network? If not, you need to join and post this case study, it is diagnostic GOLD.
I am not. I am a member of IATN however.
Oh boy, I need to buy over $1000 in new tools to diagnose this problem. Great detective work.
I don't mind spending big $$$ on tools that will help me advance my career.
I like to buy tools also.
Wow crazy case study! Thanks for sharing! I don't really see the value in the sniffer; you can pull the fuses one at a time like you have to do anyway to find out the ID. It is still a really cool tool! I love the idea of using amp clamps to figure out what's turning on first.
I'm not sure if you heard this part in the video but the second time I ran the test with the amp clamps I had 2 fuses pulling power at the exact same time. The scope I was using didn't have a fast enough sample rate to be able to accurately tell which amp clamp saw current first. That's why I had to buy the sniffer. After using the sniffer I highly recommend all technicians buy one. They are only about $200 and SO easy to use!
The problem with CAN bus decoding with a PicoScope is you are limited to 8 pages of code before the buffer runs out of room. That can be a huge disadvantage when trying to figure out a problem like this one. Being able to log over 100K messages before the buffer runs out is SO valuable! Now you can easily see the same ID woke up the buss every time over a period of several hours. That test could probably run about a week long before running out of buffer room. With the PICO I would've had to reset the scope after each time the buss woke up.
@@TechnicianRed Thanks, do you have a link for it?
@@advancedleveldiagnostics no. Just Google Peak PCAN USB
@@TechnicianRed Thanks!
Just out of curiosity did you check the current draw over time on a known good truck of same year make and model? just seems strange all 4 sensors doing the same thing... Very interesting 🤔
No, I haven't done a test yet on a known-good truck. So far the customer hasn't had any more issues but it's only been a few weeks since he picked it up. We work on a pretty good amount of these newer Superdutys so one day I will have to give it a try.
Yeah I would just be curious to see how a "known good" behaves. If you do and remember let me know what you see.@@TechnicianRed
These are fun but definitely not the most profitable projects but that customer won't be going anywhere else again
Can you make video on pscan how to setup in detail . Software to use and what can be done in detail thx. Great info
I will consider it but I wouldn't hold your breath!
Doesnr TPMS include the S for "sensor"? Always thought it was weird instead of saying TPM sensor. Like when people say "ATM machine".
Not really. TPMS stands for "Tire Pressure Monitoring System". So saying TPMS sensor is actually not really wrong or redundant.
Some tpms don't have sensors like vw / audi or honda products
Did you find out which brand of sensor was used? So the fix was to disable TPM.
No I never found out what brand sensor was used. And yes- disabling TPMS fixed the issue.
Ford and Chevy have the most fragile and unreliable tpms in my experience. I've seen a two year old buick with a sensor that died. Very bad oe quality of an important part that was developed due to a government mandate.