Jeep XJ. Manual — part 574
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 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 Left Rear Wheel Speed Sensor Connector.
Disconnect the CAB Connector.
Measure the resistance between the Left Rear Wheel Speed Sensor (+) Circuit and
ground.
Is the resistance below 15,000 ohms?
All
Yes
→
Repair the Left Rear Wheel Speed Sensor (+) circuit Short to
Ground.
Perform ABS VERIFICATION TEST - VER 1.
No
→
5
Turn the ignition off.
Disconnect the Left 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 Left Rear Wheel Speed Sensor (-) circuit and
ground.
Is the resistance below 15,000 ohms?
All
Yes
→
Repair the Left Rear Wheel Speed Sensor (-) Circuit Short to
Ground.
Perform ABS VERIFICATION TEST - VER 1.
No
→
6
Turn the ignition off.
Disconnect the Left Rear Wheel Speed Sensor Connector.
Note: Check connector - Clean/repair as necessary.
Measure the resistance between ground and each of the Left Rear Wheel Speed
Sensor circuits.
Is the resistance below 15,000 ohms?
All
Yes
→
Replace the Left 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.
27
BRAKES (CAB)
LEFT REAR SENSOR CIRCUIT FAILURE —
Continued
TEST
ACTION
APPLICABILITY
8
Turn the ignition off.
Disconnect the Left 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 Left Rear Wheel Speed Sensor (+) Circuit Open.
Perform ABS VERIFICATION TEST - VER 1.
9
Turn the ignition off.
Disconnect the Left 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 Left Rear Wheel Speed Sensor (-) circuit.
Is the resistance below 5 ohms?
All
Yes
→
No
→
Repair the Left Rear Wheel Speed Sensor (-) Circuit Open.
Perform ABS VERIFICATION TEST - VER 1.
10
Turn the ignition off.
Disconnect the Left 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 Left Rear Wheel Speed Sensor (+) Circuit.
Is the voltage above 1 volt?
All
Yes
→
Repair Left Rear Wheel Speed Sensor (+) Circuit Shorted to
Voltage.
Perform ABS VERIFICATION TEST - VER 1.
No
→
11
Turn the ignition off.
Disconnect the Left 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 Left Rear Wheel Speed Sensor (-) Circuit.
Is the voltage above 1 volt?
All
Yes
→
Repair Left Rear Wheel Speed Sensor (-) Circuit Short to Voltage.
Perform ABS VERIFICATION TEST - VER 1.
No
→
28
BRAKES (CAB)
LEFT REAR SENSOR CIRCUIT FAILURE —
Continued
TEST
ACTION
APPLICABILITY
12
Turn the ignition off.
Disconnect the CAB Connector.
Disconnect the Left Rear 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 Rear 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 Rear 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.
29
BRAKES (CAB)
LEFT REAR SENSOR CIRCUIT FAILURE —
Continued
Symptom:
LEFT REAR SENSOR SIGNAL FAILURE
When Monitored and Set Condition:
LEFT REAR SENSOR SIGNAL FAILURE
When Monitored:
Wheel speed comparison is checked at drive off or every 7 milliseconds
(ms). Wheel speed circuit continuity is checked every 7 milliseconds. Wheel speed phase
length supervision is checked every 7 milliseconds.
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.
POSSIBLE CAUSES
BOTH LEFT REAR WHEEL SPEED SENSOR CIRCUIT AND SIGNAL DTC CONDITIONS
PRESENT
LEFT REAR WHEEL SPEED SENSOR OR CONNECTOR DAMAGED
TONE WHEEL DAMAGED
LEFT REAR WHEEL SPEED SENSOR AIR GAP OUT OF SPECIFICATION
LEFT REAR WHEEL BEARING OUT OF SPECIFICATION
LEFT REAR WHEEL SPEED SENSOR INOPERATIVE
CAB - WON’T RESPOND TO LEFT REAR WHEEL SPEED SENSOR SIGNAL
INTERMITTENT SIGNAL DTC
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, read DTC’s.
Are both Left Rear Sensor Signal Failure and Left Rear Sensor Circuit Failure
displayed?
All
Yes
→
Refer to symptom Left Rear Sensor Circuit Failure in the
BRAKES Category.
Perform ABS VERIFICATION TEST - VER 1.
No
→
2
While an assistant drives the vehicle, monitor the Wheel Speed Sensors using the
DRBIII
t.
Slowly accelerate as straight as possible from a stop to 24 Km/h (15 Mph).
Is the Left Rear WSS Signal 0 Km/h (0 Mph) or differing from others by more than
5kmh (3mph)?
All
Yes
→
No
→
30
BRAKES (CAB)
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