Jeep Wrangler TJ. Manual — part 58
POSSIBLE CAUSES
SPEED SENSOR OR CONNECTOR DAMAGED
TONE WHEEL DAMAGED
WHEEL SPEED SENSOR AIR GAP OUT OF SPECIFICATION
WHEEL BEARING EXCESS RUNOUT
WHEEL SPEED SENSOR INOPERATIVE
CAB - CAN’T READ WHEEL SPEED SENSOR SIGNAL
INTERMITTENT SIGNAL DTC
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
Using the DRBIII
t, monitor all Wheel Speed Sensors while an assistant drives the
vehicle.
Slowly accelerate as straight as possible from a stop to 24 km/h (15 mph).
Note the DRBIII
t Wheel Speed Sensor readings.
Is one wheel speed signal zero or differing from others by more than 5 km/h (3 mph)?
All
Yes
→ Go To 2
No
→ Go To 7
2
Turn the ignition off.
Inspect the Wheel Speed Sensor and Connector at the affected wheel.
Is the Sensor or Connector Damaged?
All
Yes
→ Repair as necessary. The CAB must sense all four wheels at 25
km/h (15 mph) before it will extinguish the ABS Indicator.
Perform ABS VERIFICATION TEST - VER 1.
No
→ Go To 3
3
Turn the ignition off.
At the affected wheel, 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
→ Go To 4
No
→ Replace the Tone Wheel. The CAB must sense all four wheels at
25 km/h (15 mph) before it will extinguish the ABS Indicator.
Perform ABS VERIFICATION TEST - VER 1.
4
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
→ Go To 5
No
→ Repair as necessary. The CAB must sense all four wheels at 25
km/h (15 mph) before it will extinguish the ABS Indicator.
Perform ABS VERIFICATION TEST - VER 1.
23
BRAKES (CAB)
LEFT FRONT SENSOR SIGNAL FAILURE —
Continued
TEST
ACTION
APPLICABILITY
5
Turn the ignition off.
Inspect the wheel bearing for excessive runout or clearance.
Note: Refer to the appropriate service information, if necessary, for proce-
dures or specifications.
Is the bearing runout OK ?
All
Yes
→ Go To 6
No
→ Repair as necessary. The CAB must sense all four wheels at 25
km/h (15 mph) before it will extinguish the ABS Indicator.
Perform ABS VERIFICATION TEST - VER 1.
6
Turn the ignition off.
Raise the affected wheel off the ground.
Disconnect the Wheel Speed Sensor connector at the affected wheel.
Set up an AC voltmeter to read the output of the Wheel Speed Sensor.
Quickly rotate the wheel by spinning the tire by hand.
Measure the Wheel Speed Sensor AC voltage output.
Does the voltage go above 650 millivolts as the wheel is rotated?
All
Yes
→ Replace the Controller Antilock Brake in accordance with the
Service Information.
Perform ABS VERIFICATION TEST - VER 1.
No
→ Replace the Wheel Speed Sensor in accordance with the Service
Information. The CAB must sense all four wheels at 25 km/h (15
mph) before it will extinguish the ABS Indicator.
Perform ABS VERIFICATION TEST - VER 1.
7
Turn the ignition off.
Visually inspect the affected Wheel Speed Sensor for correct installation.
Visually inspect the Tone Wheel for looseness and correct installation.
Visually inspect the wiring harness for loose or intermittent connections.
Visually inspect mechanical brake components.
Inspect for conditions that may cause lockup or drag.
Inspect for seized caliper or wheel cylinder piston.
Inspect all components for a condition which may cause a Wheel Speed Signal DTC
to set.
Is any Component Damaged?
All
Yes
→ Repair as necessary. The CAB must sense all four wheels at 25
km/h (15 mph) before it will extinguish the ABS Indicator.
Perform ABS VERIFICATION TEST - VER 1.
No
→ Test Complete.
24
BRAKES (CAB)
LEFT FRONT SENSOR SIGNAL FAILURE —
Continued
Symptom:
PUMP MOTOR NOT WORKING PROPERLY
When Monitored and Set Condition:
PUMP MOTOR NOT WORKING PROPERLY
When Monitored:
Ignition on. The CAB commands the pump on at 20 km/h (12 mph) to
check its operation, if the brake switch is not applied. If the driver has their foot on the
brake, the test will run at 40 km/h (25 mph). The CAB monitors pump voltage
continuously.
Set Condition:
The DTC is stored when the CAB detects: 1) Improper voltage decay after
the pump was turned off. 2) Pump not energized by the CAB, but voltage is present for 3.5
seconds. 3) Pump is turned on by the CAB, but their is insufficient voltage to operate it.
POSSIBLE CAUSES
ABS PUMP MOTOR INTERMITTENT DTC
FUSED B(+) CIRCUIT INTERMITTENTLY SHORTED TO GROUND
FUSED B(+) CIRCUIT SHORTED TO GROUND
CAB - FUSED B(+) CIRCUIT SHORTED TO GROUND
FUSE BLOWN - PUMP MOTOR CIRCUIT
NO B+ SUPPLY TO FUSE
ABS PUMP MOTOR INOPERATIVE
FUSED B(+) CIRCUIT OPEN
GROUND CIRCUIT OPEN
GROUND CIRCUIT HIGH RESISTANCE
CAB - INTERNAL FAULT
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, actuate the ABS pump motor.
Did the Pump Motor operate when actuated?
All
No
→ Go To 2
Yes
→ Go To 13
2
Turn the ignition off.
Remove and inspect the ABS Pump fuse in the PDC.
Is the Fuse blown?
All
Yes
→ Go To 3
No
→ Go To 7
25
BRAKES (CAB)
TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Make sure the Pump Motor connector is secure.
Visually inspect the Fused B(+) Circuit in the wiring harness from the PDC to the
CAB. Look for any sign of an Intermittent Short to Ground.
Is the wiring harness OK?
All
Yes
→ Go To 4
No
→ Repair the Fused B(+) Circuit shorted to ground. The CAB must
sense all four wheels at 25 km/h (15 mph) before it will extinguish
the ABS Indicator.
Perform ABS VERIFICATION TEST - VER 1.
4
Turn the ignition off.
Remove ABS PUMP Fuse 8 from the Power Distribution Center (PDC).
Disconnect the CAB connector.
Make sure the Pump Motor connector is secure.
Note: Check connector - Clean/repair as necessary.
Using a test light connected to 12 volts, probe the Fused B (+) Circuit.
Is the test light on?
All
Yes
→ Repair the Fused B(+) circuit short to ground. The CAB must
sense all four wheels at 25 km/h (15 mph) before it will extinguish
the ABS Indicator.
Perform ABS VERIFICATION TEST - VER 1.
No
→ Go To 5
5
Turn the ignition off.
Remove ABS PUMP Fuse 12 from the PDC.
The CAB must be connected for the results of this test to be valid.
Using a test light connected to 12 volts, probe the Fused B (+) circuit in the PDC.
Is the test light on?
All
Yes
→ Replace the Controller Antilock Brake in accordance with the
Service Information.
Perform ABS VERIFICATION TEST - VER 1.
No
→ Go To 6
6
Turn the ignition off.
Make sure the Pump Motor connector is secure
If there are no potential causes remaining, replace the Fuse.
If there are no possible causes remaining, view repair.
All
Repair
Replace the ABS Pump Motor Fuse. The CAB must sense all four
wheels at 25 km/h (15 mph) before it will extinguish the ABS
Indicator.
Perform ABS VERIFICATION TEST - VER 1.
26
BRAKES (CAB)
PUMP MOTOR NOT WORKING PROPERLY —
Continued
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