Multiple PSM/ABS/Tiptronic Error codes

[Craig Apted]

Help Me Please??

 

03 996 TT. Markski Tune, Hybrids, 5bar FPR. PS2s, 138k miles, UK car. I have the following errors come up on Durametrics. 

 

Tiptronic Transmission G100

 

23: CAN: rear left wheel RPM from PSM implausible

24: CAN: front right wheel RPM from PSM implausible

25: CAN: front left wheel RPM from PSM implausible

 

ABS/PSM 5.7

 

4206: Front left speed sensor - signal implausible

4201: Front right speed sensor - signal implausible

 

I have changed the front left ABS sensor (that was the first fault to come up in this saga). I have changed both front ABS looms (Spliced in ones). I have changed tyres so they all match, had alignment done and changed the brake switch. Steering angle sensor has also been calibrated. I'm now at a loss. Has anyone had similar to this and found a solution?

 

Also, driving car normally throws no errors, but, if you boot it, PSM kicks in quite early and the brake pedal goes high (like its over vacuumed in the servo) and you can feel ABS working with slight clicks through the pedal after the slightest touch.

 

Thanks in advance for any help given.

 

Edited September 23, 2022 by Craig Apted
extra info and grammar correction

[JFP in PA]

If you have checked the wheel speed sensors at the wheel and have gotten a good signal for each of the ones reporting errors, I would start testing (continuity, resistance, short to ground, etc.) for each of the sensor wiring harness circuits from the wheels to the DME.  It is unusual for multiple wheel speed sensors to go nuts all at the same time, which may indicate a crimped or damaged harness. 

[Craig Apted]

1 minute ago, JFP in PA said:

If you have checked the wheel speed sensors at the wheel and have gotten a good signal for each of the ones reporting errors, I would start testing (continuity, resistance, short to ground, etc.) for each of the sensor wiring harness circuits from the wheels to the DME.  It is unusual for multiple wheel speed sensors to go nuts all at the same time, which may indicate a crimped or damaged harness. 

Thank you for the swift reply.

 

I had a rack change and it started shortly after. I have suspected a trapped harness as the subframe had to be dropped. Having looked, it doesn't look like any cables for the ABS/PSM go through that area as they run from the wheel carrier, through the arches and up into the frunk. However, I will check again more thoroughly because that does make sense!