POSSIBLE CAUSES
AFFECTED WHEEL SPEED SENSOR AIR GAP FAULT
WHEEL BEARING FAULT
BRAKE LINING FAULT
AFFECTED WHEEL SPEED SENSOR CIRCUIT ELECTRICAL FAULT
TEST ACTION APPLICABILITY
1 Turn the ignition on.
With the DRBIIIt, read DTCs.
With the DRBIIIt, read and record Freeze Frame information.
NOTE: The CAB must sense ALL 4 wheels at 25 km/h (15 mph) before it will
extinguish the ABS indicators.
Does the DRBIIIt display WHEEL SPEED/SIGNAL FAILURE and SENSOR CIR-
CUIT FAILURE?
All
Yes → Refer to the affected Wheel Speed SENSOR CIRCUIT FAILURE
for the related symptom(s).
Perform ABS VERIFICATION TEST - VER 1.
No → Go To 2
2 Turn the ignition on.
With the DRBIIIt in Sensors, monitorALL the Wheel Speed Sensor Signals while an
assistant drives the vehicle.
Slowly accelerate as straight as possible from a stop to 24 km/h (15 mph).
Is the affected Wheel Speed Signal showing 0 km/h (0 mph)?
All
Yes → Go To 3
No → The condition is not present at this time. Monitor DRBIIIt
parameters while wiggling the related wiring harness. Refer to
any Technical Service Bulletins(TSB) that may apply. Visually
inspect the related wiring harness and connector terminals.
Perform ABS VERIFICATION TEST - VER 1.
3 Turn the ignition off.
Inspect the CAB connector, affected Wheel Speed Sensor, and affected Wheel Speed
Sensor connector.
Is the Wheel Speed Sensor or any connector damaged?
All
Yes → Repair as necessary.
Perform ABS VERIFICATION TEST - VER 1.
No → Go To 4
4 Turn ignition off.
Inspect the affected Tone Wheel for damaged, missing teeth, cracks, or looseness.
NOTE: The Tone Wheel teeth should be perfectly square, not bent, or nicked.
Is the affected Tone Wheel OK?
All
Yes → Go To 5
No → Replace the Tone Wheel in accordance with the Service Informa-
tion.
Perform ABS VERIFICATION TEST - VER 1.
23
BRAKES (CAB)
LEFT FRONT WHEEL SPEED SIGNAL FAILURE — Continued
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