A4 Quattro Sedan V6-2.8L (ACK) (1997)
Rough Road Sensor: Testing and Inspection
NOTE:
-
When the ABS/EDL control module senses a wheel spinning, 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 trouble code 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.
-
Emissions testing on a front-wheel drive vehicle with ABS/EDL, during which only the front wheels turn while the rear wheels are stationary, can
result in the DTC 18014 being stored in DTC memory. Therefore, the fuse for the ABS/EDL control module must be removed. After the test,
check DTC memory for the ABS/EDL control module and the ECM. Then erase DTC memory.
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. Refer to "Code Control Module (Function 07) under On Board Diagnostic General" See: Powertrain Management/Fuel Delivery
and Air Induction/Testing and Inspection
Test sequence
-
Switch ignition off.
-
Connect VAG 1598/22 test box to ECM harness connector.
-
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.