WABCO iABS 2S/1M Standard Maintenance Manual page 41

Diagnostics
Suspect
Blink
SPN FMI Component
Code
and Location
3 3 5 Wheel
Speed
Sensor C
3 3 6 Wheel
Speed
Sensor C
Fault
ITP
Description
Function
(FMI)
N/A Open Circuit
N/A Short Circuit
Cause Repair Information
An open circuit - Check sensor, sensor cable
has been detected, and connectors to verify no
i.e. ECU detects a loose or damaged connection.
disconnected wheel - Verify 900-2000 ohms
speed sensor. resistance through sensor
circuit.
- Check for corroded or
damaged wiring between
the ECU and the ABS wheel
speed sensor.
- Swap sensor in question
with adjacent sensor at the
ECU. If the fault code stays
in the same location, replace
ECU. If the fault code changes
locations, replace the suspect
sensor.
Continuity - Check sensor, sensor cable
interruption and connectors to verify no
between the sensor loose or damaged connection.
connections (short - Check for corroded or
circuit) has been damaged wiring between
detected. the ECU and the ABS wheel
speed sensor.
- Check for corrosion or
discoloration at ECU sensor
pins and/or connector.
- Visually inspect sensor
extension female connector to
ensure it is not out of round or
spread resulting in intermittent
contact with the ECU sensor
pins.
- Verify 900-2000 ohms
resistance through sensor
circuit.
- Swap sensor in question
with adjacent sensor at the
ECU. If the fault code stays
in the same location, replace
ECU. If the fault code changes
locations replace the suspect
sensor.
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