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93 - Rear Sensor Shorted

REAR SENSOR SHORTED-93





For a complete wiring diagram, refer to Wiring Diagram Information.

When Monitored
Ignition on.

Set Condition
The CAB detect high voltage on the wheel speed sensor circuit.

Possible Causes
- INTERMITTENT REAR FRONT WHEEL SPEED SENSOR DTC
- REAR FRONT WHEEL SPEED SENSOR (+) CIRCUIT SHORTED TO VOLTAGE
- REAR FRONT WHEEL SPEED SENSOR (-) CIRCUIT SHORTED TO VOLTAGE
- REAR FRONT WHEEL SPEED SENSOR (+) CIRCUIT SHORTED TO THE REAR FRONT WHEEL SPEED
- SENSOR (-) CIRCUIT
- TONE WHEEL
- EXCESSIVE REAR FRONT WHEEL SPEED SENSOR AIR GAP
- WHEEL BEARING
- REAR FRONT WHEEL SPEED SENSOR
- CONTROLLER ANTI-LOCK BRAKE

Diagnostic Test
1. DTC IS ACTIVE
Turn the ignition on.
With the scan tool, clear DTCs.
Turn the ignition off.
Turn the ignition on.
With the scan tool, read DTCs.

Does the DRBIII (R) display the DTC?
Yes >> Go To 2
No >> Go To 11

2. WHEEL SPEED SENSOR INSPECTION
Turn the ignition off.
Inspect the Wheel Speed Sensor for proper mounting.
Inspect the Wheel Speed Sensor harness and connector.
Inspect the Wheel Speed Sensor for excessive debris on the sensor.

Were any problems found?
Yes >> Repair as necessary in accordance with the Service Information.
Perform ABS VERIFICATION TEST - VER 1. ABS Verification Test
No >> Go To 3

3. TONE WHEEL DAMAGED/MISSING
Inspect the Tone Wheel in accordance with the Service Information.

NOTE: The Tone Wheel Teeth should be perfectly square, not bent or nicked.

Were any problems found?
Yes >> Replace the Tone Wheel in accordance with the Service Information.
Perform ABS VERIFICATION TEST - VER 1. ABS Verification Test
No >> Go To 4

4. EXCESSIVE WHEEL SPEED SENSOR AIR GAP
Measure the Wheel Speed Sensor Air Gap in accordance with the Service Information.

Were any problems found?
Yes >> Repair as necessary in accordance with the Service Information.
Perform ABS VERIFICATION TEST - VER 1. ABS Verification Test
No >> Go To 5

5. WHEEL BEARING LOOSE/BINDING
Inspect the wheel bearings for excessive run out or improper clearance in accordance with the Service Information.

Were any problems found?
Yes >> Repair as necessary in accordance with the Service Information.
Perform ABS VERIFICATION TEST - VER 1. ABS Verification Test
No >> Go To 6

6. REAR WHEEL SPEED SENSOR (+) CIRCUIT SHORTED TO VOLTAGE
Turn the ignition on.
Measure the voltage of the Rear Wheel Speed Sensor (+) circuit.





Is there any voltage present?
Yes >> Repair Rear Wheel Speed Sensor (+) circuit for a short to voltage.
Perform ABS VERIFICATION TEST - VER 1. ABS Verification Test
No >> Go To 7

7. REAR WHEEL SPEED SENSOR (-) CIRCUIT SHORTED TO VOLTAGE





Measure the voltage of the Rear Wheel Speed Sensor (-) circuit.

Is there any voltage present?
Yes >> Repair the Rear Wheel Speed Sensor (-) circuit for a short to voltage.
Perform ABS VERIFICATION TEST - VER 1. ABS Verification Test
No >> Go To 8





8. REAR WHEEL SPEED SENSOR (+) CIRCUIT SHORTED TO THE Rear WHEEL SPEED SENSOR (-) CIRCUIT





Turn the ignition off. Measure the resistance between the Rear Wheel Speed Sensor (+) circuit and the Rear Wheel Speed Sensor (-) circuit at the Controller Anti-lock Brake harness connector.

Is the resistance below 5.0 ohms?
Yes >> Repair Rear Wheel Speed Sensor (+) circuit for a short to the Rear Wheel Speed Sensor (-) circuit.
Perform ABS VERIFICATION TEST - VER 1. ABS Verification Test
No >> Go To 9

9. REAR WHEEL SPEED SENSOR
Turn the ignition off.
Connect the Rear Wheel Speed Sensor harness connector.
Measure the resistance between the Rear Wheel Speed Sensor (+) circuit and Rear Wheel Speed Sensor (-) circuit at the Controller Anti-lock Brake harness connector.

NOTE: The resistance should be approximately 1600-2300 ohms at 76 degrees F.

Is the resistance within the noted range?
Yes >> Go to 10
No >> Replace the Rear Wheel Speed Sensor in accordance with the Service Information.
Perform ABS VERIFICATION TEST - VER 1. ABS Verification Test

10. CONTROLLER ANTI-LOCK BRAKE
Turn the ignition off.
Inspect the related wiring harness. Look for any chafed, pierced, pinched, or partially broken wires.
Inspect the related wire harness connectors. Look for broken, bent, pushed out, or corroded terminals.
Refer to any Technical Service Bulletins that may apply.

Were any problems found?
Yes >> Repair as necessary in accordance with the Service Information.
Perform ABS VERIFICATION TEST - VER 1. ABS Verification Test
No >> Replace the Controller Anti-lock Brake in accordance with the Service Information.
Perform ABS VERIFICATION TEST - VER 1. ABS Verification Test

11. WIRING HARNESS INSPECTION
Turn the ignition off.

NOTE: Towing the vehicle with ignition ON may set this DTC.
Inspect the related wiring harness. Look for any chafed, pierced, pinched, or partially broken wires.
Inspect the related wire harness connectors. Look for broken, bent, pushed out, or corroded terminals.
Refer to any Technical Service Bulletins that may apply.

Were any problems found?
Yes >> Repair as necessary in accordance with the Service Information.
Perform ABS VERIFICATION TEST - VER 1. ABS Verification Test
No >> Test Complete.
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