P1561

DIAGNOSTIC TROUBLE CODES P1560, P1561
TCS active (test signal)
Signal low/high
No continuity or shorting to ground/batt+

Condition
No test signal from TCS when starting
TCS signal constantly high or pulses of longer duration than 2.5 seconds

Diagnostic Procedure.
1. Use the ISAT command "TCS ACTIVE" in the "READ ON/OFF" menu.
Raise the car and run the front wheels in 1st gear. On opening the throttle, the Traction Control System (TCS) lamp should light up and the ISAT show "TCS ACTIVE - YES".

If this is OK, proceed to step 5.
If not, continue as described below.

2. With the ignition switched OFF, connect a BOB to the MOTRONIC control module and cable. Read what is written about TCS active (full-load disconnection), see "TCS Active" at "Computers and Control Systems/Description and Operation".

With the warmed-up engine switched OFF and the ignition switch in the DRIVE position, check that a 100 Hz PWM signal of 0.25-1.0 V is present on pin 54.

If it is not, proceed to step 5.
If the signal is OK, proceed to step 3.





3. With the engine switched OFF and the ignition switch in the DRIVE position, check whether a test signal from the TCS control module is present on pin 38. This signal should be a 31 Hz PWM signal of about 6 V.

If the signal is not OK, check the lead between pin 38 of the MOTRONIC control module and pin 21 of the TCS control module for continuity/shorting.

4. If the MOTRONIC control module sends a signal out on pin 54 but no test signal is received on pin 38, check the lead between pin 54 of the MOTRONIC control module and pin 11 of the TCS control module.

If the lead is OK, the diagnostic trouble code has probably been generated in the TCS system. If this is the case, continue fault diagnosis in the Traction Control System.

5. If no faults can be detected after carrying out the above diagnostic procedure, clear all trouble codes and drive the car to check whether any trouble codes are generated afresh.

If they are, continue at "Before Replacing Control Module" for further diagnostic instructions. Before Replacing A Control Module