Jeep XJ. Manual — part 578
TEST
ACTION
APPLICABILITY
8
Turn the ignition off.
Disconnect the CAB connector.
Set up a voltmeter to measure AC voltage on the Right Front Wheel Speed Sensor
Signal Circuits at the CAB connector.
Raise the right front wheel off the ground.
Quickly rotate the wheel by spinning the tire by hand.
Measure the AC voltage on the Right Front Wheel Speed Sensor (+) and (-) Signal
Circuits.
Does the voltage go above 650 millivolts as the wheel is rotated?
All
Yes
→
Replace the CAB.
Perform ABS VERIFICATION TEST - VER 1.
No
→
Replace the Right Front Wheel Speed Sensor.
Perform ABS VERIFICATION TEST - VER 1.
43
BRAKES (CAB)
RIGHT FRONT SENSOR SIGNAL FAILURE —
Continued
Symptom:
RIGHT REAR SENSOR CIRCUIT FAILURE
When Monitored and Set Condition:
RIGHT REAR 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 REAR WHEEL SPEED SENSOR OR CONNECTOR DAMAGE
INTERMITTENT DTC
RIGHT REAR WHEEL SPEED SENSOR (+) CIRCUIT SHORTED TO GROUND
RIGHT REAR WHEEL SPEED SENSOR (-) CIRCUIT SHORTED TO GROUND
RIGHT REAR WHEEL SPEED SENSOR - SHORT TO GROUND
CAB - INTERNAL SHORT OR OPEN
RIGHT REAR WHEEL SPEED SENSOR (+) CIRCUIT OPEN
RIGHT REAR WHEEL SPEED SENSOR (-) CIRCUIT OPEN
RIGHT REAR WHEEL SPEED SENSOR (+) CIRCUIT SHORTED TO VOLTAGE
RIGHT REAR WHEEL SPEED SENSOR (-) CIRCUIT SHORTED TO VOLTAGE
RIGHT REAR WHEEL SPEED SENSOR CIRCUITS SHORT TOGETHER
RIGHT REAR 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 RR Wheel Speed Sensor Circuit Failure DTC?
All
Yes
→
No
→
2
Turn the ignition off.
Inspect the Right Rear Wheel Speed Sensor and Connector.
Is the Sensor or Connector Damaged?
All
Yes
→
Repair as necessary.
Perform ABS VERIFICATION TEST - VER 1.
No
→
44
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 Rear 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 Rear Wheel Speed Sensor Connector.
Disconnect the CAB Connector.
Measure the resistance between the Right Rear Wheel Speed Sensor (+) Circuit and
ground.
Is the resistance below 15,000 ohms?
All
Yes
→
Repair the Right Rear Wheel Speed Sensor (+) circuit Short to
Ground.
Perform ABS VERIFICATION TEST - VER 1.
No
→
5
Turn the ignition off.
Disconnect the Right Rear 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 Rear Wheel Speed Sensor (-) circuit and
ground.
Is the resistance below 15,000 ohms?
All
Yes
→
Repair the Right Rear Wheel Speed Sensor (-) Circuit Short to
Ground.
Perform ABS VERIFICATION TEST - VER 1.
No
→
6
Turn the ignition off.
Disconnect the Right Rear Wheel Speed Sensor Connector.
Note: Check connector - Clean/repair as necessary.
Measure the resistance between ground and both of the Right Rear Wheel Speed
Sensor circuits.
Is the resistance below 15,000 ohms?
All
Yes
→
Replace the Right Rear 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.
45
BRAKES (CAB)
RIGHT REAR SENSOR CIRCUIT FAILURE —
Continued
TEST
ACTION
APPLICABILITY
8
Turn the ignition off.
Disconnect the Right Rear 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 of the wheel speed sensor (+) circuit.
Is the resistance below 5 ohms?
All
Yes
→
No
→
Repair the Right Rear Wheel Speed Sensor (+) Circuit Open.
Perform ABS VERIFICATION TEST - VER 1.
9
Turn the ignition off.
Disconnect the Right Rear 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 of the Right Rear Wheel Speed Sensor (-) circuit.
Is the resistance below 5 ohms?
All
Yes
→
No
→
Repair the Right Rear Wheel Speed Sensor (-) Circuit Open.
Perform ABS VERIFICATION TEST - VER 1.
10
Turn the ignition off.
Disconnect the Right Rear Wheel Speed Sensor connector.
Note: Check connector - Clean/repair as necessary.
Disconnect the CAB connector.
Note: Check connector - Clean/repair as necessary.
Turn the ignition on.
Measure the voltage of the Right Rear Wheel Speed Sensor (+) Circuit.
Is the voltage above 1 volt?
All
Yes
→
Repair Right Rear Wheel Speed Sensor (+) Circuit Shorted to
Voltage.
Perform ABS VERIFICATION TEST - VER 1.
No
→
11
Turn the ignition off.
Disconnect the Right Rear Wheel Speed Sensor connector.
Note: Check connector - Clean/repair as necessary.
Disconnect the CAB connector.
Note: Check connector - Clean/repair as necessary.
Turn the ignition on.
Measure the voltage of the Right Rear Wheel Speed Sensor (-) Circuit.
Is the voltage above 1 volt?
All
Yes
→
Repair Right Rear Wheel Speed Sensor (-) Circuit Short to
Voltage.
Perform ABS VERIFICATION TEST - VER 1.
No
→
46
BRAKES (CAB)
RIGHT REAR SENSOR CIRCUIT FAILURE —
Continued
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