C102A-LEFT REAR WHEEL SPEED COMPARATIVE PERFORMANCE
For a complete wiring diagram Refer to Section 8W.
Possible Causes
|
LEFT REAR WSS LOOSE — B3, B4 CIRCUITS/CONNECTOR/TERMINAL DAMAGE
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IMPROPER LEFT REAR TIRE PRESSURE/MISMATCHED TIRES
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LEFT REAR TONE WHEEL DAMAGE
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LEFT REAR WSS
|
ANTI-LOCK BRAKE MODULE
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Diagnostic Test
1.
CHECK FOR DTC C102A-LEFT REAR WHEEL SPEED COMPARATIVE PERFORMANCE
NOTE:
This DTC must be active for the results of this test to be valid.
Turn the ignition on.
With the scan tool, record and erase DTCs.
Road test the vehicle over 40 km/h (25 mph).
NOTE:
Vehicle must be driven above 40 km/h (25 mph) for set conditions to be met.
With the scan tool, read DTCs.
Does the scan tool display: C102A-LEFT REAR WHEEL SPEED COMPARATIVE PERFORMANCE active?
Yes
No
2.
CHECK WHEEL SPEED SENSOR SIGNALS
Turn the ignition on.
With the scan tool, monitor and graph ALL the WSS speeds and compare graph while an assistant drives the vehicle.
NOTE:
If graph shows periodic dropouts pay close attention to the tone wheel.
Slowly accelerate as straight as possible from a stop to 40 km/h (25 mph).
Is the Left Rear WSS speed showing 0 km/h (0 mph) or not matching other wheels or showing erratic behavior?
Yes
No
-
The condition that caused the symptom is currently not present. Inspect the related wiring for a possible intermittent condition. Look for any chafed, pierced,
pinched, or partially broken wires.
-
Refer to the ABS-INTERMITTENT CONDITION TEST.
(Refer to 5 - BRAKES - DIAGNOSIS AND TESTING)
3.
CHECK FOR IMPROPER LEFT REAR TIRE PRESSURE/MISMATCHED TIRES
Turn the ignition off.
Check and adjust the Left Rear Tire pressure.
Check and adjust all other tire pressures.
Inspect for mismatched tires on vehicle.
Is the Left Rear Tire improperly inflated or mismatched tires on vehicle?
Yes
No
4.
CHECK LEFT REAR WSS LOOSENESS, INSPECT B3, B4 CIRCUITS/TERMINALS FOR DAMAGE
NOTE:
Check all terminals for broken, bent, pushed out, or corroded terminals
Inspect the Anti-Lock Brake Module harness connector, Left Rear WSS, and Left Rear WSS harness connector.
Inspect the Left Rear WSS for looseness, excessive corrosion and not properly fastened.
Inspect the (B3) Left Rear WSS Signal and (B4) Left Rear WSS Supply circuits between the Left Rear WSS and Anti-Lock Brake Module for damage.
Is the Left Rear WSS loose or any of the wiring/connectors/terminals damaged?
Yes
No
5.
CHECK LEFT REAR WHEEL SPEED SENSOR FOR DAMAGE
Remove the Left Rear Wheel Speed Sensor
Inspect the Left Rear Wheel Speed Sensor face for damage.
Is the Left Rear Wheel Speed Sensor damaged?
Yes
No
6.
CHECK LEFT REAR TONE WHEEL FOR DAMAGE
Inspect the Left Rear Tone Wheel for damage, missing teeth, cracks, corrosion or looseness.
NOTE:
The Tone Wheel teeth should be perfectly square, not bent, or nicked.
Is the Left Rear Tone Wheel damaged?
Yes
No
7.
LEFT REAR WHEEL SPEED SENSOR
Replace the Left Rear Wheel Speed Sensor in accordance with the Service Information.
Perform ABS VERIFICATION TEST.
(Refer to 5 - BRAKES - STANDARD PROCEDURE)
Road test the vehicle over 40 km/h (25 mph).
NOTE:
Vehicle must be driven above 40 km/h (25 mph) for set conditions to be met.
With the scan tool, read ABS DTCs.
Did DTC C102A-LEFT REAR WHEEL SPEED COMPARATIVE PERFORMANCE reset?
Yes
No