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I am very new to the forum, so if this is in the wrong place please let me know. I also tried searching for this issue but didn't find anything, if it has been covered in a previous thread I'd love to read it.
I've had my 97 C5 for about 4 weeks now and haven't had any real issues.
But today on my way home I was doing about 75mph on the highway when suddenly the Traction Control went active and stayed on. Throttle was completely unresponsive but otherwise the car felt normal.
I turned the traction control off and took the first exit possible, parked it and turned it back on again and it seemed to work fine. I drove around for a little bit and it was still fine so I went home.
The DIC did not give me any new codes but it has 10-PCM P1571 H since before, which I understand is a communications issue between the PCM and TCS.
Does anyone know if this is something I should worry about or what could've caused it? And if so, where do I start troubleshooting?
I realize this might be nothing and just a random gremlin but I'm the anxious type so I'd rather ask a stupid question than do nothing at all.
Thanks again Rob!
Unfortunately that's a little bit out of my budget right now.
After a bit of digging and reading through Bill Curlees sticky post about grounding points I'm thinking that might be a good place to start.
Bill Dearborn wrote in another thread that "The PCM supplies 5 volts on the desired torque circuit to the Electronic Brake and Traction Control Module (EBTCM). The EBTCM toggles this 5 volt signal to a ground in order to produce a duty cycle signal" so it sounds like a bad ground could cause all sorts of issues with that circuit.
So I think I'll start with going over and cleaning the ground connections and ground plug, worst case I waste some time and get rid of some grime.
But I'm definitely still open for suggestions, this vehicle is very new to me
The PCM supply a 5 volt to the EBCTM module.
The EBCTM toggles the 5volt to ground depending on the amount of torq reduction the EBCTM want .
The signal looks like the last screendump .This DTC could be caused by a faulty EBCTM
Regarding scanners a good and cheap solution is the TOPDON Topscan blotooth dongle .
You can use it on most car models produced after 1996 .
I bought one last year (less then 80 USD and it was very good in my opinion with the low cost in mind. .
I have several scanners Tech2 , Tech2win (on laptop) ,Autel and a SnapOn Edge , but the Topscan is a easy choice sometimes when I want to scan a friends car
The PCM supply a 5 volt to the EBCTM module.
The EBCTM toggles the 5volt to ground depending on the amount of torq reduction the EBCTM want .
The signal looks like the last screendump .This DTC could be caused by a faulty EBCTM
I think I see your point. But if I understand things correctly the DTC could be caused by any of four things: faulty EBCTM, faulty PCM, Sensors and/or Wiring. Wiring seems to be the cheapest and easiest thing to fix and I'm part of a makerspace with a lift so it's a pretty quick job and I figure it can't hurt to try.
I guess I could also try probing the circuit with an oscilloscope and make sure the lows and highs of the pwm signal is nice and consistent.
There's also a high probability of me not knowing what the hell I'm doing, so there's that. 😁
Speaking of faulty components, I see you're from southern Norway, I'm from western Sweden, got any tips for good places to find replacements for stuff like this?
Originally Posted by oelarse
Regarding scanners a good and cheap solution is the TOPDON Topscan blotooth dongle .
You can use it on most car models produced after 1996 .
I bought one last year (less then 80 USD and it was very good in my opinion with the low cost in mind. .
I have several scanners Tech2 , Tech2win (on laptop) ,Autel and a SnapOn Edge , but the Topscan is a easy choice sometimes when I want to scan a friends car
That's quite affordable and seems to be available on EU amazon. Gonna bookmark that. Thanks!
I did bring up the need for a proper scanner for the previously mentioned makerspace and people seem to agree, so hopefully I can get access that way 🤞
The first thing I recommend to do when having a EBCTM problem is to verify proper voltages and grounds to the module .
Depending on the DTC I would verifty the wirings of the faulty signal
Below is the schematic of the rear mounted ebctm on your car
I bought me an extra spare EBCTM module from this Swedish company some years ago to my 2000 model C5
Otherwise I think you may need to search ebay for these module .
The first thing I recommend to do when having a EBCTM problem is to verify proper voltages and grounds to the module .
Depending on the DTC I would verifty the wirings of the faulty signal
Below is the schematic of the rear mounted ebctm on your car
Yeah that makes sense and is fairly accessible. Thanks, I really appreciate the help!
Originally Posted by oelarse
I bought me an extra spare EBCTM module from this Swedish company some years ago to my 2000 model C5
Otherwise I think you may need to search ebay for these module .
I had a hunch, I was browsing their listings earlier, no EBCM module though
Traction Control got stuck ON
