Jeep Wrangler TJ. Manual — part 57
Symptom List:
LEFT FRONT SENSOR CIRCUIT FAILURE
LEFT REAR SENSOR CIRCUIT FAILURE
RIGHT FRONT SENSOR CIRCUIT FAILURE
RIGHT REAR SENSOR CIRCUIT FAILURE
Test Note:
All symptoms listed above are diagnosed using the same tests.
The title for the tests will be LEFT FRONT SENSOR CIRCUIT
FAILURE.
When Monitored and Set Condition:
LEFT FRONT SENSOR CIRCUIT FAILURE
When Monitored:
Ignition on. The CAB monitors the Wheel Speed Sensor circuits
continuously.
Set Condition:
If the CAB detects an open or shorted wheel speed sensor circuit, the
Diagnostic Trouble Code (DTC) will set.
LEFT REAR SENSOR CIRCUIT FAILURE
When Monitored:
Ignition on. The CAB monitors the Wheel Speed Sensor circuits
continuously.
Set Condition:
If the CAB detects an open or shorted wheel speed sensor circuit, the
Diagnostic Trouble Code (DTC) will set.
RIGHT FRONT SENSOR CIRCUIT FAILURE
When Monitored:
Ignition on. The CAB monitors the Wheel Speed Sensor circuits
continuously.
Set Condition:
If the CAB detects an open or shorted wheel speed sensor circuit, the
Diagnostic Trouble Code (DTC) will set.
RIGHT REAR SENSOR CIRCUIT FAILURE
When Monitored:
Ignition on. The CAB monitors the Wheel Speed Sensor circuits
continuously.
Set Condition:
If the CAB detects an open or shorted Wheel speed sensor circuit, the
Diagnostic Trouble Code (DTC) will set.
POSSIBLE CAUSES
SENSOR OR CONNECTOR DAMAGE
INTERMITTENT DTC
WHEEL SPEED SENSOR OPEN OR SHORTED TO GROUND
WHEEL SPEED SENSOR (+) OR (-) CIRCUIT SHORTED TO VOLTAGE
19
BRAKES (CAB)
POSSIBLE CAUSES
WHEEL SPEED SENSOR (+) OR (-) CIRCUIT SHORTED TO GROUND
WHEEL SPEED SENSOR CIRCUITS SHORTED TOGETHER
SPEED SENSOR (+) OR (-) CIRCUIT OPEN
CAB - INTERNAL SHORT OR OPEN
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 a Wheel Speed Sensor Circuit Failure DTC?
All
Yes
→ Go To 2
No
→ Go To 9
2
Turn the ignition off.
Inspect the affected Wheel Speed Sensor and Connector.
Is the Sensor or Connector Damaged?
All
Yes
→ Repair as necessary.
Perform ABS VERIFICATION TEST - VER 1.
No
→ Go To 3
3
Turn the ignition off.
Disconnect the affected Wheel Speed Sensor connector.
Note: Check connector - Clean/repair as necessary.
Measure the resistance across the Wheel Speed Sensor (+) and (-) circuits at the
Sensor side of the connector.
Measure the resistance between ground and the (+) and (-) circuits on the Sensor side
of the connector.
Is the Sensor resistance 900 to 1300 ohms and resistance to ground more than 15k
ohms?
All
Yes
→ Go To 4
No
→ Repair the short or replace the Wheel Speed Sensor, as necessary.
Perform ABS VERIFICATION TEST - VER 1.
4
Turn the ignition off.
Disconnect the affected 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 Wheel Speed Sensor (+) and (-) circuits.
Is the voltage above 1 volt at either circuit?
All
Yes
→ Repair the Wheel Speed Sensor circuit for a short to voltage.
Perform ABS VERIFICATION TEST - VER 1.
No
→ Go To 5
20
BRAKES (CAB)
LEFT FRONT SENSOR CIRCUIT FAILURE —
Continued
TEST
ACTION
APPLICABILITY
5
Turn the ignition off.
Disconnect the affected Wheel Speed Sensor Connector.
Disconnect the CAB Connector.
Measure the resistance between the Wheel Speed Sensor (+) and (-) circuits and
ground.
Is the resistance below 15,000 ohms for either circuit?
All
Yes
→ Repair the Wheel Speed Sensor circuit short to ground.
Perform ABS VERIFICATION TEST - VER 1.
No
→ Go To 6
6
Turn the ignition off.
Disconnect the CAB Connector.
Disconnect the affected Wheel Speed Sensor harness connector.
Measure the resistance through the Wheel Speed Sensor (+) and (-) circuits at the
CAB harness connector.
Is the resistance below 200 ohms?
All
Yes
→ Repair the Wheel Speed Sensor circuits shorted together.
Perform ABS VERIFICATION TEST - VER 1.
No
→ Go To 7
7
Turn the ignition off.
Disconnect the affected 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 (+) and (-) circuits.
Is the resistance below 5 ohms for both circuits?
All
Yes
→ Go To 8
No
→ Repair the Wheel Speed Sensor (+) or (-) circuit for an open.
Perform ABS VERIFICATION TEST - VER 1.
8
If there are no possible causes remaining, view repair.
All
Repair
Replace the Controller Antilock Brake in accordance with the
Service Information.
Perform ABS VERIFICATION TEST - VER 1.
9
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 component and in-line 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.
21
BRAKES (CAB)
LEFT FRONT SENSOR CIRCUIT FAILURE —
Continued
Symptom List:
LEFT FRONT SENSOR SIGNAL FAILURE
LEFT REAR SENSOR SIGNAL FAILURE
RIGHT FRONT SENSOR SIGNAL FAILURE
RIGHT REAR SENSOR SIGNAL FAILURE
Test Note:
All symptoms listed above are diagnosed using the same tests.
The title for the tests will be LEFT FRONT SENSOR SIGNAL
FAILURE.
When Monitored and Set Condition:
LEFT FRONT SENSOR SIGNAL FAILURE
When Monitored:
Wheel speed comparison is checked at drive off and continuously
thereafter.
Set Condition:
If, during an ABS stop, the CAB commands any valve solenoid on for an
extended length of time, and does not see a corresponding wheel speed change, the
Diagnostic Trouble Code (DTC) is set. The DTC can also set if the signal is missing or
erratic.
LEFT REAR SENSOR SIGNAL FAILURE
When Monitored:
Wheel speed comparison is checked at drive off and continuously
thereafter.
Set Condition:
If, during an ABS stop, the CAB commands any valve solenoid on for an
extended length of time, and does not see a corresponding wheel speed change, the
Diagnostic Trouble Code (DTC) is set. The DTC can also set if the signal is missing or
erratic.
RIGHT FRONT SENSOR SIGNAL FAILURE
When Monitored:
Wheel speed comparison is checked at drive off and continuously
thereafter.
Set Condition:
If, during an ABS stop, the CAB commands any valve solenoid on for an
extended length of time, and does not see a corresponding wheel speed change, the
Diagnostic Trouble Code (DTC) is set. The DTC can also set if the signal is missing or
erratic.
RIGHT REAR SENSOR SIGNAL FAILURE
When Monitored:
Wheel speed comparison is checked at drive off and continuously
thereafter.
Set Condition:
If, during an ABS stop, the CAB commands any valve solenoid on for an
extended length of time, and does not see a corresponding wheel speed change, the
Diagnostic Trouble Code (DTC) is set. The DTC can also set if the signal is missing or
erratic.
22
BRAKES (CAB)
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