Jeep Liberty KJ. Manual — part 832
3.
COMPARE WHEEL SPEED SENSOR SIGNALS
WARNING: Ensure brake capability is available before road testing.
With the scan tool, monitor ALL WSS speeds while an assistant drives the vehicle.
Slowly accelerate as straight as possible from a stop to 40 km/h (25 m.p.h.).
Is the Left Rear WSS speed showing 0 km/h (0 m.p.h.) or not matching other wheel speeds?
Yes
>> Go To 4
No
>> Perform the ABS Intermittent Condition diagnostic procedure in this Section.
Perform ABS VERIFICATION TEST - VER 1. (Refer to 5 - BRAKES - STANDARD PROCEDURE).
4.
INSPECT LEFT REAR WSS, WIRE HARNESS, CONNECTORS & TERMINALS
Turn the ignition off.
Inspect the Anti-Lock Brakes Module harness connector, Left Rear WSS connector, and Left Rear WSS harness
connector for broken, bent, pushed out, and corroded terminals.
Verify that the Left Rear WSS is properly installed and fastened.
Inspect the Left Rear WSS wire harness between the sensor and the Anti-Lock Brakes Module for damage.
Were any problems found?
Yes
>> Repair as necessary.
Perform ABS VERIFICATION TEST - VER 1. (Refer to 5 - BRAKES - STANDARD PROCEDURE).
No
>> Go To 5
5.
INSPECT LEFT REAR TONE WHEEL
Inspect the tone wheel for damage, missing teeth, cracks, and looseness. The teeth must be perfectly square, not
bent, or nicked.
Is the tone wheel damaged?
Yes
>> Replace the Left Rear Tone Wheel in accordance with the Service Information.
Perform ABS VERIFICATION TEST - VER 1. (Refer to 5 - BRAKES - STANDARD PROCEDURE).
No
>> Go To 6
6.
CHECK LEFT REAR WSS AIR GAP
Using a feeler gauge, measure the Left Rear WSS air gap.
NOTE: Refer to the appropriate service information for procedures and specifications.
Is the Left Rear WSS air gap within specifications?
Yes
>> Go To 7
No
>> Repair as necessary.
Perform ABS VERIFICATION TEST - VER 1. (Refer to 5 - BRAKES - STANDARD PROCEDURE).
7.
CHECK LEFT REAR WHEEL BEARING FOR DAMAGE
Check the left rear wheel bearing for excessive runout and clearance.
NOTE: Refer to the appropriate service information for procedures and specifications.
Is the left rear wheel bearing damaged?
Yes
>> Repair as necessary.
Perform ABS VERIFICATION TEST - VER 1. (Refer to 5 - BRAKES - STANDARD PROCEDURE).
No
>> Go To 8
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BRAKES - ABS ELECTRICAL DIAGNOSTICS
KJ
8.
CHECK LEFT REAR BRAKE HARDWARE FOR DAMAGE
Visually inspect the left rear brake linings for contamination and overheating. Check for dragging, bent, and seized
components and hardware.
Is any brake lining, component, or hardware damaged?
Yes
>> Repair as necessary.
Perform ABS VERIFICATION TEST - VER 1. (Refer to 5 - BRAKES - STANDARD PROCEDURE).
No
>> Go To 9
9.
VERIFY DTC IS ACTIVE
Replace the Left Rear WSS in accordance with the Service Information.
Turn the ignition on.
With the scan tool, erase ABS DTCs.
WARNING: Ensure brake capability is available before road testing.
Road test the vehicle over 40 km/h (25 m.p.h.).
With the scan tool, read ABS DTCs.
Does DTC C102A–LEFT REAR WHEEL SPEED COMPARATIVE PERFORMANCE reset?
Yes
>> Replace the Anti-Lock Brakes Module in accordance with the Service Information.
Perform ABS VERIFICATION TEST - VER 1. (Refer to 5 - BRAKES - STANDARD PROCEDURE).
No
>> Test Complete.
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BRAKES - ABS ELECTRICAL DIAGNOSTICS
5 - 89
C102B–RIGHT REAR WHEEL SPEED SENSOR CIRCUIT
For a complete wiring diagram Refer to Section 8W.
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BRAKES - ABS ELECTRICAL DIAGNOSTICS
KJ
•
When Monitored:
With the ignition on.
•
Set Condition:
If the Right Rear Wheel Speed Sensor signal current is out of range.
Possible Causes
WIRING HARNESS, TERMINAL, CONNECTOR DAMAGE
(B2) RIGHT REAR WSS 12 VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE, SHORTED TO GROUND, OR
OPEN
(B1) RIGHT REAR WSS SIGNAL CIRCUIT SHORTED TO VOLTAGE, SHORTED TO GROUND, OR OPEN
(B1) RIGHT REAR WSS SIGNAL CIRCUIT SHORTED TO (B2) RIGHT REAR WSS 12 VOLT SUPPLY CIRCUIT
RIGHT REAR WSS
ANTI-LOCK BRAKES MODULE
Diagnostic Test
1.
VERIFY DTC IS ACTIVE
Turn the ignition on.
With the scan tool, record and erase ABS DTCs.
Cycle the ignition switch.
With the scan tool, read ABS DTCs.
Does the scan tool display: C102B–RIGHT REAR WHEEL SPEED SENSOR CIRCUIT?
Yes
>> Go To 2
No
>> Perform the ABS Intermittent Condition diagnostic procedure in this Section.
Perform ABS VERIFICATION TEST - VER 1. (Refer to 5 - BRAKES - STANDARD PROCEDURE).
2.
INSPECT CONNECTORS & TERMINALS FOR DAMAGE
Turn the ignition off.
Inspect the Anti-Lock Brakes Module harness connector, Right Rear WSS harness connector, and Right Rear WSS
harness connector for broken, bent, pushed out, and corroded terminals.
Are any of the connectors or terminals damaged?
Yes
>> Repair as necessary.
Perform ABS VERIFICATION TEST - VER 1. (Refer to 5 - BRAKES - STANDARD PROCEDURE).
No
>> Go To 3
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BRAKES - ABS ELECTRICAL DIAGNOSTICS
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