Rough Road Sensor: Testing and Inspection

Rough road signal from ABS/EDL control module, checking

NOTE:
- When the ABS/EDL control module senses wheel spin, it produces the rough road signal. When the ECM recognizes the rough road signal, the misfire recognition is switched off.
- Check the rough road signal only when the DTC 18014 "Rough Road Spec Engine Torque ABS-ECU Electrical Malfunction" is stored. The possible "Misfire" malfunction is in this case a subsequent malfunction that can be disregarded.
- The wiring and the rough road signal are monitored by the ECM.

Required special tools and test equipment
- VAG 1551 or VAG 1552 Scan Tool (ST) with VAG 1551/3 adapter cable
- VAG 1598/22 test box

Test requirements
- ECM coding OK

Test sequence
- Switch ignition off.
- Connect VAG 1598/22 test box to ECM harness connector.Refer to "Scan Tool Testing/Scan Tool Connecting and Initial Checks/Connecting VAG 1598/22 Test Box" Testing and Inspection







- Check signal wiring between ECM/test box terminal 45 and ABS control module for short circuit or open circuit.

If the wiring is OK:
- Replace ABS control module.

If the malfunction occurs again after the ABS control module has been replaced:
- Replace Motronic ECM -J220-.
- Carry out adaptation of throttle valve control module to ECM.
- Check readiness code. If Diagnostic Trouble Code (DTC) memory has been erased, or ECM was disconnected, generate new readiness code. Refer to "Moniters, Trips and/or Drive Cycle (Readiness Codes)/Checking Readiness Code" Testing and Inspection Refer to "Moniters, Trips and/or Drive Cycle (Readiness Codes)/Generating Readiness Code Testing and Inspection