Jeep XJ. Manual — part 576
TEST
ACTION
APPLICABILITY
8
Turn the ignition off.
Disconnect Pump Motor Connector.
Connect a 10 gauge jumper wire between pump motor Fused B (+) circuit and a 40
Amp Fused B (+) circuit.
Connect a 10 gauge jumper wire between pump motor ground circuit and a known
good body ground.
Monitor Pump Motor operation.
Is the pump motor running?
All
Yes
→
No
→
Replace the ABS Pump Motor/Hydraulic Control Unit assembly.
Perform ABS VERIFICATION TEST - VER 1.
9
Turn the ignition off.
Remove the ABS PUMP Fuse #12 from the Power Distribution Center (PDC).
Disconnect the CAB connector.
Note: Check connector - Clean/repair as necessary.
Measure the resistance of the Fused B (+) circuit between the PDC Fuse Terminal
and the CAB connector.
Is the resistance below 10 ohms?
All
Yes
→
No
→
Repair the Fused B(+) circuit for an open.
Perform ABS VERIFICATION TEST - VER 1.
10
Turn the ignition off.
Disconnect CAB Connector.
Note: Check connector - Clean/repair as necessary.
Measure the resistance of the CAB ground circuits.
Is the resistance below 1.0 ohms?
All
Yes
→
No
→
Repair the ground circuit circuit for an open.
Perform ABS VERIFICATION TEST - VER 1.
11
Turn the ignition on.
With the DRBIII
t, enable pump motor actuation.
NOTE: Pump motor will not operate, but voltage will be applied.
Measure the voltage drop across the ABS ground circuit connection, with pump motor
actuation enabled.
Is the voltage below 0.1 volt?
All
Yes
→
No
→
Repair the Ground circuit for an open.
Perform ABS VERIFICATION TEST - VER 1.
12
If there are no potential causes remaining, view repair.
All
Repair
Replace the Controller Anti-Lock Brake in accordance with the
Service Information.
Perform ABS VERIFICATION TEST - VER 1.
35
BRAKES (CAB)
PUMP MOTOR NOT WORKING PROPERLY —
Continued
TEST
ACTION
APPLICABILITY
13
Turn the ignition off.
Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or
partially broken wires.
Visually inspect the related wire harness connectors. Look for broken, bent, pushed
out, or corroded terminals.
Refer to any Hotline letters or Technical Service Bulletins that may apply.
Were any problems found?
All
Yes
→
Repair as necessary.
Perform ABS VERIFICATION TEST - VER 1.
No
→
Test Complete.
36
BRAKES (CAB)
PUMP MOTOR NOT WORKING PROPERLY —
Continued
Symptom:
RIGHT FRONT SENSOR CIRCUIT FAILURE
When Monitored and Set Condition:
RIGHT FRONT SENSOR CIRCUIT FAILURE
When Monitored:
Ignition on. The CAB monitors the wheel speed circuit every 7
milliseconds (ms).
Set Condition:
If the CAB detects an open or shorted wheel speed sensor circuit, the
Diagnostic Trouble Code (DTC) will set.
POSSIBLE CAUSES
RIGHT FRONT WHEEL SPEED SENSOR OR CONNECTOR DAMAGE
INTERMITTENT DTC
RIGHT FRONT WHEEL SPEED SENSOR (+) CIRCUIT SHORTED TO GROUND
RIGHT FRONT WHEEL SPEED SENSOR (-) CIRCUIT SHORTED TO GROUND
RIGHT FRONT WHEEL SPEED SENSOR - SHORT TO GROUND
CAB - INTERNAL SHORT OR OPEN
RIGHT FRONT WHEEL SPEED SENSOR (+) CIRCUIT OPEN
RIGHT FRONT WHEEL SPEED SENSOR (-) CIRCUIT OPEN
RIGHT FRONT WHEEL SPEED SENSOR (+) CIRCUIT SHORTED TO VOLTAGE
RIGHT FRONT WHEEL SPEED SENSOR (-) CIRCUIT SHORTED TO VOLTAGE
RIGHT FRONT WHEEL SPEED SENSOR CIRCUITS SHORT TOGETHER
RIGHT FRONT WHEEL SPEED SENSOR RESISTANCE OUT OF SPECIFICATION
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, read DTC’s.
With the DRBIII
t, erase DTC’s.
Turn the ignition off.
Turn the ignition on.
With the DRBIII
t, read DTC’s.
Does the DRBIII
t display RF Wheel Speed Sensor Circuit Failure DTC?
All
Yes
→
No
→
2
Turn the ignition off.
Inspect the Right Front Wheel Speed Sensor and Connector.
Is the Sensor or Connector Damaged?
All
Yes
→
Repair as necessary.
Perform ABS VERIFICATION TEST - VER 1.
No
→
37
BRAKES (CAB)
TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Disconnect the CAB connector.
Note: Check connector - Clean/repair as necessary.
Measure the resistance across the Right Front Wheel Speed Sensor (+) and (-) circuits
at the CAB connector.
Is the resistance between 900 and 1,300 ohms?
All
Yes
→
No
→
4
Turn the ignition off.
Disconnect the Right Front Wheel Speed Sensor Connector.
Disconnect the CAB Connector.
Measure the resistance between the Right Front Wheel Speed Sensor (+) Circuit and
ground.
Is the resistance below 15,000 ohms?
All
Yes
→
Repair the Right Front Wheel Speed Sensor (+) circuit Short to
Ground.
Perform ABS VERIFICATION TEST - VER 1.
No
→
5
Turn the ignition off.
Disconnect the Right Front Wheel Speed Sensor Connector.
Note: Check connector - Clean/repair as necessary.
Disconnect the CAB Connector.
Note: Check connector - Clean/repair as necessary.
Measure the resistance between the Right Front Wheel Speed Sensor (-) circuit and
ground.
Is the resistance below 15,000 ohms?
All
Yes
→
Repair the Right Front Wheel Speed Sensor (-) Circuit Short to
Ground.
Perform ABS VERIFICATION TEST - VER 1.
No
→
6
Turn the ignition off.
Disconnect the Right Front Wheel Speed Sensor Connector.
Note: Check connector - Clean/repair as necessary.
Measure the resistance between ground and both of the Right Front Wheel Speed
Sensor circuits.
Is the resistance below 15,000 ohms?
All
Yes
→
Replace the Right Front Wheel Speed Sensor.
Perform ABS VERIFICATION TEST - VER 1.
No
→
7
If there are no possible causes remaining, view repair.
All
Repair
Replace the CAB.
Perform ABS VERIFICATION TEST - VER 1.
38
BRAKES (CAB)
RIGHT FRONT SENSOR CIRCUIT FAILURE —
Continued
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