24-98
If no vehicle speed is displayed between
standstill and moving:
- Switch ignition OFF and connect VAG 1598/19
test box page 01
-255
.
- Connect VAG 1527B voltage tester between test
box sockets 13C (signal) and 10D (B+).
- Raise front of vehicle until left-front wheel is free
to rotate.
Note:
The right front wheel must NOT rotate.
- Switch ignition ON.
Voltage tester must light up at half strength
- Rotate left front wheel by hand.
Voltage tester must become brighter (flash)
If tester does not light up (become brighter) or
flash:
-
Check wiring between test box socket 13X and
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24-109
Rough road condition signal, checking
ABS control module with ABS/EDL
Notes:
Misfires can result in malfunctions such as
"Combustion misfire" being recorded in DTC
memory due to road wheel malfunctions.
If the ABS control module recognizes a free
turning wheel, it generates a rough road signal.
If the Engine Control Module (ECM) recognizes
the rough road signal, misfire recognition is
switched off in the ECM.
The rough road signal is created to check
whether DTC 18014 "Rough Road Spec Engine
Torque ABS-SG Electrical Malfunction" is
stored in DTC memory. The "Combustion
misfire" malfunction results from this signal and
can be ignored.
The rough road signal is monitored by the
ECM.
Checking requirement
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