With Manufacturer's Scan Tool

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 (P1606) "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.
- If an exhaust emissions test is performed on a front-wheel-drive vehicle with ABS/EDL where the front axle/wheels are moved while the rear axle/wheels remain stationary can cause DTC 18014 (P1606) to be stored DTC memory.
- The fuse for the ABS/EDL control module must be removed when performing emissions tests on these vehicles. Check and erase DTC memory for the ABS/EDL control module and the engine control module after an emissions test.

Special tools and equipment
- VAG1551 or VAG1552 Scan Tool (ST) with VAG1551/3 adapter cable
- VAG1598/22 test box

Checking conditions
- Control module coding OK.

Checking






- Connect VAG1598/22 test box to ECM harness connector.
- Check wiring for open circuit between ECM/test box (sockets 5 and 45) and ABS/EDL control module using appropriate wiring diagram.
Specified value: max. 1.5 Ohms

If the wiring is OK:
- Replace ABS Control Module (w/EDL) -J104-.

If the display does not change after replacing the ABS/EDL control module:
- Replace Motronic ECM -J220-. Service and Repair