WABCO iABS 2S/1M Standard, Maintenance Manual

Page: 47 / 188

47
Diagnostics
Blink
Code
SPN FMI
Suspect
Component
and Location
ITP
Function
Fault
Description
(FMI)
Cause Repair Information
4 4 6 Wheel
Speed
Sensor D
N/A Short Circuit Continuity
interruption
between the sensor
connections (short
circuit) has been
detected.
- Check for damaged or
missing teeth on tone ring.
- Verify tone ring is
not corroded or with
contamination.
- Check for loose wheel
bearings or excessive hub
runout.
- 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.
4 4 7 Wheel
Speed
Sensor D
N/A Tone Ring
Damaged
Wheel speed
signal drops out
periodically at
speeds higher than
6 mph.
- Check for damaged or
missing teeth on tone ring.
- Verify tone ring is
not corroded or with
contamination.
- Check for loose wheel
bearings or excessive hub
runout.
4 4 8 Wheel
Speed
Sensor D
N/A Excessive
Slip
Wheel slip over
16 seconds
continuously has
been detected.
- Adjust wheel sensor to touch
tone ring.
- Check sensor gap.
- Check for loose wheel
bearings or excessive hub
runout.