Jeep XJ. Manual — part 572
Symptom:
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 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
LEFT FRONT WHEEL SPEED SENSOR OR CONNECTOR DAMAGE
INTERMITTENT DTC
LEFT FRONT WHEEL SPEED SENSOR (+) CIRCUIT SHORTED TO GROUND
LEFT FRONT WHEEL SPEED SENSOR (-) CIRCUIT SHORTED TO GROUND
LEFT FRONT WHEEL SPEED SENSOR SHORTED TO GROUND
CAB - INTERNAL SHORT OR OPEN
LEFT FRONT WHEEL SPEED SENSOR (+) CIRCUIT OPEN
LEFT FRONT WHEEL SPEED SENSOR (-) CIRCUIT OPEN
LEFT FRONT WHEEL SPEED SENSOR (+) CIRCUIT SHORTED TO VOLTAGE
LEFT FRONT WHEEL SPEED SENSOR (-) CIRCUIT SHORTED TO VOLTAGE
LEFT FRONT WHEEL SPEED SENSOR CIRCUITS SHORT TOGETHER
LEFT 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 9Left Front Wheel Speed Sensor Circuit Failure9 DTC
present right now?
All
Yes
→
No
→
2
Turn the ignition off.
Inspect the Left Front Wheel Speed Sensor and Connector.
Is the Sensor or Connector Damaged?
All
Yes
→
Repair as necessary.
Perform ABS VERIFICATION TEST - VER 1.
No
→
19
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 Left Front Wheel Speed Sensor (+) circuit and the
Left Front Wheel Speed Sensor (-) circuit at the CAB connector.
Is the resistance between 900 and 1,300 ohms?
All
Yes
→
No
→
4
Turn the ignition off.
Disconnect the Left Front Wheel Speed Sensor Connector.
Disconnect the CAB Connector.
Measure the resistance between the Left Front Wheel Speed Sensor (+) Circuit and
ground.
Is the resistance below 15,000 ohms?
All
Yes
→
Repair the Left Front Wheel Speed Sensor (+) Circuit Short to
Ground.
Perform ABS VERIFICATION TEST - VER 1.
No
→
5
Turn the ignition off.
Disconnect the Left 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 Left Front Wheel Speed Sensor (-) Circuit and
ground.
Is the resistance below 15,000 ohms?
All
Yes
→
Repair the Left Front Wheel Speed Sensor (-) Circuit Short to
Ground.
Perform ABS VERIFICATION TEST - VER 1.
No
→
6
Turn the ignition off.
Disconnect the Left Front Wheel Speed Sensor Connector.
Note: Check connector - Clean/repair as necessary.
On the component, measure the resistance between both of the Left Front Wheel
Speed Sensor Terminals and ground.
Is the resistance below 15,000 ohms?
All
Yes
→
Replace the Left 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.
20
BRAKES (CAB)
LEFT FRONT SENSOR CIRCUIT FAILURE —
Continued
TEST
ACTION
APPLICABILITY
8
Turn the ignition off.
Disconnect the Left 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 of the wheel speed sensor (+) circuit.
Is the resistance below 5 ohms?
All
Yes
→
No
→
Repair the Left Front Wheel Speed Sensor (+) Circuit Open.
Perform ABS VERIFICATION TEST - VER 1.
9
Turn the ignition off.
Disconnect the Left 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 of the Left Front Wheel Speed Sensor (-) circuit.
Is the resistance below 5 ohms?
All
Yes
→
No
→
Repair the Left Front Wheel Speed Sensor (-) Circuit Open.
Perform ABS VERIFICATION TEST - VER 1.
10
Turn the ignition off.
Disconnect the Left Front 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 Left Front Wheel Speed Sensor (+) Circuit.
Is the voltage above 1 volt?
All
Yes
→
Repair Left Front Wheel Speed Sensor (+) Circuit Shorted to
Voltage.
Perform ABS VERIFICATION TEST - VER 1.
No
→
11
Turn the ignition off.
Disconnect the Left Front 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 Left Front Wheel Speed Sensor (-) Circuit.
Is the voltage above 1 volt?
All
Yes
→
Repair Left Front Wheel Speed Sensor (-) Circuit Short to Voltage.
Perform ABS VERIFICATION TEST - VER 1.
No
→
21
BRAKES (CAB)
LEFT FRONT SENSOR CIRCUIT FAILURE —
Continued
TEST
ACTION
APPLICABILITY
12
Turn the ignition off.
Disconnect the CAB Connector.
Disconnect the left front 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 Left Front Wheel Speed Sensor Circuits Shorted
together.
Perform ABS VERIFICATION TEST - VER 1.
No
→
13
If there are no possible causes remaining, view repair.
All
Repair
Replace the Left Front Wheel Speed Sensor.
Perform ABS VERIFICATION TEST - VER 1.
14
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.
22
BRAKES (CAB)
LEFT FRONT SENSOR CIRCUIT FAILURE —
Continued
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