ECU AUDI A4 1998 B5 / 1.G APB Engine Additional Signals Checking Workshop Manual

24-198

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.
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24-206
If the correct control modules are installed:

- Check to be sure the multi-pin connectors of the
control modules are securely connected.
If multi-pin connectors are properly secured:

- Check CAN-bus system as described in repair
manual Page 24
-202
.

The following trouble shooting procedure is
recommended if three or more control
modules communicate via a "two-wire bus
system".

- Read out malfunctions stored in the control
modules.

This will help to identify a malfunction in the
wiring.
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