Rough Road Sensor: Testing and Inspection

Signal For Rough Road Recognition From ABS/EDL Control Module, Checking


NOTE:
- The ABS/EDL control module generates the rough road signal if it recognizes wheel spin on a wheel. The Engine Control Module (ECM) switches off the misfire recognition once the rough road signal is recognized by the ECM.
- The rough road signal should only be checked if the malfunction (P1606) 18014 "Rough Road Spec Engine Torque ABS-ECU/Electrical Malfunction" is stored in the DTC memory. It is possible that the malfunction "Misfiring" is also stored in DTC memory, however this is then a sequence error and should be ignored.
- The wiring and the rough road signal is monitored by the ECM.


Test conditions
- Control module coding OK.

Test sequence
- Connect VAG1598/31 test box to wiring harness for engine control module. Do not connect to the engine control module itself. Refer to "Scan Tool Testing/Scan Tool Connecting and Initial Checks/Connecting VAG1598/31 Test Box" Testing and Inspection
- Check wire from test box socket 74 to ABS Control Module according to wiring diagram for short circuit or open circuit.

If no malfunction is detected:
- Replace ABS control module.

If, after the ABS control module has been replaced the malfunction appears again:
- Replace Engine Control Module (ECM)