Rough Road Sensor: Testing and Inspection

Rough Terrain Signal From ABS/EDL Control Module, Checking


Special Tools and Equipment







- VAG1526A
- VAG1527B
- VAG1594A
- VAG1598/31
- VAS5051 with VAG505/1
- or
- VAG1551 with VAG155/3B


NOTE:
- When the ABS/EDL control module recognizes that a wheel is spinning, the ABS/EDL control module generates the rough terrain signal. When the Engine Control Module (ECM) recognizes the rough terrain signal, combustion misfire recognition is switched off in the Engine Control Module (ECM).
- Only check the rough terrain signal if the malfunction "18074 (P1606) rough terrain info/engine torque from ABS cont. mod. Electrical malfunction in circuit" is stored DTC memory. It is possible that the malfunction "Combustion misfire" is also stored in DTC memory as a side effect and it can be disregarded.
- The wire connection and rough terrain signal are monitored by the Engine Control Module (ECM).


Test requirement:
- Control module coding OK. Refer to Programming Control Module (ECM), (Function 07) Testing and Inspection

Test sequence
- Switch ignition off.
- Connect VAG1598/31 test box at wiring harness to ECM, do not connect ECM. Refer to "Scan Tool Testing/Scan Tool Connecting and Initial Checks/Connecting VAG1598/31 Test Box" Testing and Inspection
- Check the following wire connection for open circuit and short circuit to Ground (GND) and B+:

Test box ABS control module (w/EDL)
VAG1598/31 -J104-
Socket Terminal
74 -

If no malfunctions are found in wire:
- Replace ABS control module.

If the malfunction is indicated again after replacing the ABS control module:
- Replace Engine Control Module (ECM).