WABCO iABS 2S/1M Standard Maintenance Manual page 43

Diagnostics
Suspect
Blink
SPN FMI Component
Code
and Location
3 3 10 Wheel
Speed
Sensor C
3 3 11 Wheel
Speed
Sensor C
Fault
ITP
Description
Function
(FMI)
N/A Speed Jump
Upwards or
Downwards
N/A Abnormal
Speed
(Chatter)
Cause Repair Information
Wheel speed - Adjust wheel speed sensor
difference. until it touches the tone ring.
- Check for loose wheel
bearings or excessive hub
runout.
- Check sensor wiring and
connectors for intermittent
contact.
- Check condition of ABS
sensor head.
- Check mounting of tone ring
and condition of teeth.
- Check condition and
retention of ABS sensor spring
clip.
- Check ABS sensor cable
routing and clipping.
- Check for corroded or
damaged wiring between
the ECU and the ABS wheel
speed sensor.
- Turn the wheel at half a
revolution per second and
verify 0.2 AC volt sensor
output voltage.
Brake drag or - Check for loose wheel
chatter has been bearings or excessive hub
detected. Abnormal runout.
vibrations detected - Check sensor wiring and
which affect sensor connectors for intermittent
signal. contact.
- Check mounting of tone ring
and condition of teeth.
- Check condition and
retention of ABS sensor spring
clip as well as the mounting
block.
- Check for corroded or
damaged wiring between
the ECU and the ABS wheel
speed sensor.
- Turn the wheel at half a
revolution per second and
verify 0.2 AC volt sensor
output voltage.
43