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Right Front Wheel Speed Sensor Circuit

RIGHT FRONT WHEEL SPEED SENSOR CIRCUIT





When Monitored and Set Condition
^ When Monitored (Supply circuit): Ignition on. The Controller Antilock Brake (CAB) monitors the wheel speed circuit every 7 milliseconds (ms).
^ When Monitored (Signal circuit): Wheel speed comparison is checked at drive off or every 7 milliseconds (ms). Sensor Signal continuity is checked every 7 milliseconds. Wheel speed phase length supervision is checked every 7 milliseconds.
^ Set Condition (Supply circuit): If the CAB detects an open or shorted wheel speed sensor circuit, the Diagnostic Trouble Code (DTC) will set.
^ Set Condition (Signal circuit): 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.





For a complete Electronic Stability Program (ESP) Circuit Diagram refer to Diagrams; Electrical.

Diagnostic Test
1. WITH THE DRB III, READ DTCs
Turn the ignition on.





With the DRB III, record and erase DTCs.
Turn the ignition off.
Turn the ignition on.
With the DRB III, read DTCs.
Does the DRB III display a Right Front Wheel Speed Sensor Circuit Failure DTC?
Yes >> Go to 2
No >> Go to 12

2. INSPECT THE RIGHT FRONT WHEEL SPEED SENSOR
Turn the ignition off.
Inspect the Right Front Wheel Speed Sensor and connector.
Is the Sensor or Connector damaged?
Yes >> Repair as necessary. Perform ABS VERIFICATION TEST. ABS Verification Test
No >> Go to 3

3. MEASURE THE VOLTAGE OF THE RIGHT FRONT WHEEL SPEED SENSOR 12 VOLT SUPPLY CIRCUIT
With the ignition off.
Disconnect the Right Front Wheel Speed Sensor harness connector.

Note: Check connectors - Clean/repair as necessary.

Turn the ignition on.





Measure the voltage of the Right Front Wheel Speed Sensor 12 Volt Supply circuit at the Right Front Wheel Speed Sensor harness connector.
Is the voltage approximately 12 volts?
Yes >> Go to 7
No >> Go to 4

4. MEASURE THE VOLTAGE OF THE RIGHT FRONT WHEEL SPEED SENSOR 12 VOLT SUPPLY CIRCUIT
Turn the ignition off.





Measure the voltage of the Right Front Wheel Speed Sensor 12 Volt Supply circuit at the Right Front Wheel Speed Sensor harness connector.
Is the voltage 0 volts?
Yes >> Go to 5
No >> Replace the Controller Antilock Brake.Perform ABS VERIFICATION TEST.

5. MEASURE THE RESISTANCE BETWEEN GROUND AND THE RIGHT FRONT WHEEL SPEED SENSOR 12 VOLT SUPPLY CIRCUIT
With the ignition off.
Disconnect the CAB harness connector.

Note: Check connectors - Clean/repair as necessary.





Measure the resistance between ground and the Right Front Wheel Speed Sensor 12 Volt Supply circuit at the CAB harness connector.
Is the resistance below 15k ohms?
Yes >> Repair the Right Front Wheel Speed Sensor 12 Volt Supply circuit for a short to ground. Perform ABS VERIFICATION TEST.
No >> Go to 6

6. MEASURE THE RESISTANCE OF THE RIGHT FRONT WHEEL SPEED SENSOR 12 VOLT SUPPLY CIRCUIT
With the ignition off.





Measure the resistance of the Right Front Wheel Speed Sensor 12 Volt Supply circuit from the CAB harness connector to the Right Front Wheel Speed Sensor harness connector.
Is the resistance below 5.0 ohms?
Yes >> Go to 7
No >> Repair the Right Front Wheel Speed Sensor 12 Volt Supply circuit for an open. Perform ABS VERIFICATION TEST.

7. MEASURE THE RESISTANCE OF THE RIGHT FRONT WHEEL SPEED SENSOR SIGNAL CIRCUIT
With the ignition off.
Reconnect the CAB harness connector.





Measure the resistance between ground and the Right Front Wheel Speed Sensor Signal circuit.
Is the resistance less than 100 ohms?
Yes >> Go to 10
No >> Go to 8

8. MEASURE THE RESISTANCE OF THE RIGHT FRONT WHEEL SPEED SENSOR SIGNAL CIRCUIT
With the ignition off.





Measure the resistance between ground and the Right Front Wheel Speed Sensor Signal circuit.
Is the resistance greater than 300 ohms?
Yes >> Go to 9
No >> Replace the Right Front Wheel Speed Sensor. Perform ABS VERIFICATION TEST.

9. MEASURE THE RESISTANCE OF THE RIGHT FRONT WHEEL SPEED SENSOR SIGNAL CIRCUIT
With the ignition off.
Disconnect the CAB harness connector.

Note: Check connectors - Clean/repair as necessary.





Measure the resistance of the Right Front Wheel Speed Sensor Signal circuit from the CAB harness connector to the Right Front Wheel Speed Sensor harness connector.
Is the resistance below 5.0 ohms?
Yes >> Go to 11
No >> Repair the Right Front Wheel Speed Sensor Signal circuit for an open. Perform ABS VERIFICATION TEST.

10. MEASURE THE RESISTANCE BETWEEN GROUND AND THE RIGHT FRONT WHEEL SPEED SENSOR SIGNAL CIRCUIT
With the ignition off.





Measure the resistance between ground and the Right Front Wheel Speed Sensor Signal circuit at the CAB harness connector.
Is the resistance below 15k ohms?
Yes >> Repair the Right Front Wheel Speed Sensor signal circuit for a short to ground. Perform ABS VERIFICATION TEST.
No >> Go to 11

11. MEASURE THE RESISTANCE BETWEEN THE RIGHT FRONT WHEEL SPEED SENSOR 12 VOLT SUPPLY CIRCUIT AND THE SENSOR SIGNAL CIRCUIT
With the ignition off.





Measure the resistance between the Right Front Wheel Speed Sensor 12 Volt Supply circuit and the Right Front Wheel Speed Sensor Signal circuit at the CAB harness connector.
Is the resistance below 1000.0 ohms?
Yes >> Repair the Right Front Wheel Speed Sensor 12 Volt Supply circuit for a short to the Right Front Wheel Speed Sensor Signal circuit. Perform ABS VERIFICATION TEST.
No >> Replace the Controller Antilock Brake. Perform ABS VERIFICATION TEST.

12. VISUALLY INSPECT COMPONENTS FOR DAMAGE AND CORRECT INSTALLATION
Visually inspect the related wiring harness and connectors. Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out, or corroded terminals.
Visually inspect the Right Front Wheel Speed Sensor, connector and tone wheel for damage and correct installation.
Are there any visible Sensor, connector or tone wheel concerns?
Yes >> Correct the sensor, connector or tone wheel concerns as necessary. Perform ABS VERIFICATION TEST.
No >> Go to 13

13. MONITOR ALL WHEEL SPEED SENSORS WITH THE DRB III





With the DRB III, erase DTCs.
Start the engine.
With an assistant to drive, use the DRB III to monitor all wheel speed sensors. Slowly accelerate as straight as possible from a stop to 15 MPH.
Is the Right Front Wheel Speed Sensor Signal 0 or differing from others by more than 3 MPH?
Yes >> Replace the Right Front Wheel Speed Sensor. Perform ABS VERIFICATION TEST.
No >> Inspect and repair the related wiring harness for a possible intermittent condition. Perform ABS VERIFICATION TEST.
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