Jeep XJ. Manual — part 577
TEST
ACTION
APPLICABILITY
8
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 of the wheel speed sensor (+) circuit.
Is the resistance below 5 ohms?
All
Yes
→
No
→
Repair the Right Front Wheel Speed Sensor (+) Circuit Open.
Perform ABS VERIFICATION TEST - VER 1.
9
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 of the Right Front Wheel Speed Sensor (-) circuit.
Is the resistance below 5 ohms?
All
Yes
→
No
→
Repair the Right Front Wheel Speed Sensor (-) Circuit Open.
Perform ABS VERIFICATION TEST - VER 1.
10
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.
Turn the ignition on.
Measure the voltage of the Right Front Wheel Speed Sensor (+) Circuit.
Is the voltage above 1 volt?
All
Yes
→
Repair Right Front Wheel Speed Sensor (+) Circuit Shorted to
Voltage.
Perform ABS VERIFICATION TEST - VER 1.
No
→
11
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.
Turn the ignition on.
Measure the voltage of the Right Front Wheel Speed Sensor (-) Circuit.
Is the voltage above 1 volt?
All
Yes
→
Repair Right Front Wheel Speed Sensor (-) Circuit Short to
Voltage.
Perform ABS VERIFICATION TEST - VER 1.
No
→
39
BRAKES (CAB)
RIGHT FRONT SENSOR CIRCUIT FAILURE —
Continued
TEST
ACTION
APPLICABILITY
12
Turn the ignition off.
Disconnect the CAB Connector.
Disconnect the Right 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 Right 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 Right 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.
40
BRAKES (CAB)
RIGHT FRONT SENSOR CIRCUIT FAILURE —
Continued
Symptom:
RIGHT FRONT SENSOR SIGNAL FAILURE
When Monitored and Set Condition:
RIGHT FRONT SENSOR SIGNAL FAILURE
When Monitored:
Wheel speed comparison is checked at drive off or every 7 milliseconds
(ms). Wheel speed 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 RIGHT FRONT WHEEL SPEED SENSOR CIRCUIT AND SIGNAL DTC CONDITIONS
PRESENT
RIGHT FRONT WHEEL SPEED SENSOR OR CONNECTOR DAMAGED
TONE WHEEL DAMAGED
RIGHT FRONT WHEEL SPEED SENSOR AIR GAP OUT OF SPECIFICATION
RIGHT FRONT WHEEL BEARING OUT OF SPECIFICATION
RIGHT FRONT WHEEL SPEED SENSOR INOPERATIVE
CAB - WON’T RESPOND TO RIGHT FRONT WHEEL SPEED SENSOR SIGNAL
INTERMITTENT SIGNAL DTC
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, read DTC’s.
Are both Right Front Sensor Signal Failure and Right Front Sensor Circuit Failure
displayed?
All
Yes
→
Refer to symptom Right Front 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 Right Front WSS Signal 0 Km/h (0 Mph) or differing from others by more than
5kmh (3mph)?
All
Yes
→
No
→
41
BRAKES (CAB)
TEST
ACTION
APPLICABILITY
3
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
→
4
Turn the ignition off.
Inspect the Tone Wheel for damaged or missing teeth, cracks, or looseness.
Note: The Tone Wheel Teeth should be perfectly square, not bent or nicked.
Is the Tone Wheel OK?
All
Yes
→
No
→
Replace the Tone Wheel.
Perform ABS VERIFICATION TEST - VER 1.
5
Turn the ignition off.
Using a Feeler Gauge, measure the Wheel Speed Sensor Air Gap.
NOTE: The Air Gap should be checked in at least four places on the Tone
Wheel.
Is the Air Gap between 0.42 mm - 1.71 mm (0.017
9 - 0.0689) ?
All
Yes
→
No
→
Repair as necessary.
Perform ABS VERIFICATION TEST - VER 1.
6
Turn the ignition off.
Inspect the wheel bearings for excessive runout or clearance.
Note: Refer to the appropriate service information, if necessary, for proce-
dures or specifications.
Is the bearing clearance OK ?
All
Yes
→
No
→
Repair as necessary.
Perform ABS VERIFICATION TEST - VER 1.
7
Turn the ignition off.
Visually inspect wheel speed sensor.
Visually inspect tone wheel.
Visually inspect wiring harness.
Visually inspect brakes for locking up due to lining contamination or overheating.
Inspect all Components for defects which may cause a Signal DTC to set.
Is any Component Damaged?
All
Yes
→
Repair as necessary.
Perform ABS VERIFICATION TEST - VER 1.
No
→
42
BRAKES (CAB)
RIGHT FRONT SENSOR SIGNAL FAILURE —
Continued
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