Test Point 8

TEST POINT 8
Speed signal front right/left
Signal implausible

DTC 55, 62

Fault Effect: - No manual program.
- Upshifting is not prevented during braking.
- No downshifting during braking.
- Substitute value for transverse acceleration.

Note:
The wheel speeds can be checked with Porsche System Tester 2 (Actual values/Speed signal (FR)/(FL)). To do this, raise the vehicle and spin the right or left front wheel by hand.

1. Check wheel speed with the Tester.

2. Read out fault memory of the ABS/TC control module and remedy the fault according to the ABS test plan.






3. Check wiring from the Tiptronic control module connector pin 38 (or 39) to the ABS/TC control module connector pin 25 (or 26) for open circuit, short to ground and short to B+.