Antilock Brake System (ABS): 1351

1351-YAW RATE/ACCELERATION SENSOR - UNDER VOLTAGE





When Monitored and Set Condition
^ When Monitored: ignition on.
^ Set Condition: The Controller Antilock Brake (CAB) detects a ESP Yaw Rate/Lateral Acceleration Sensor Under voltage condition.

POSSIBLE CAUSES
- ESP YAW RATE/LATERAL ACCELERATION SENSOR 5-VOLT SUPPLY CIRCUIT OPEN
- ESP YAW RATE/LATERAL ACCELERATION SENSOR 5-VOLT SUPPLY CIRCUIT SHORT TO GROUND
- ESP YAW RATE/LATERAL ACCELERATION SENSOR 5-VOLT SUPPLY CIRCUIT SHORT TO SENSOR
- GROUND
- ESP YAW RATE/LATERAL ACCELERATION SENSOR
- CONTROLLER ANTILOCK BRAKE (CAB)
- For a complete Antilock Brake System (ABS) Circuit Diagram, (Refer to -BRAKES/ELECTRICAL - SCHEMATICS AND DIAGRAMS).

Diagnostic Test
1. MEASURE THE YAW RATE/ACCELERATION SENSOR 5 VOLT SUPPLY CIRCUIT





Turn the ignition off. Disconnect the Yaw Rate/Acceleration Sensor harness connector.

Note: Check connectors - Clean/repair as necessary.

Turn the ignition on. Measure the voltage of the Yaw Rate/Acceleration Sensor 5 Volt Supply circuit at the Yaw Rate/Acceleration Sensor harness connector.
Is the voltage between 4.5 and 5.0 volts?
No >> Go to 2
Yes >> Replace the Yaw Rate/Acceleration Sensor. Perform ABS VERIFICATION TEST. ABS Verification Test

2. MEASURE THE RESISTANCE BETWEEN GROUND AND THE YAW RATE/ACCELERATION SENSOR 5-VOLT SUPPLY CIRCUIT





With the ignition off. Disconnect the Controller Antilock Brake (CAB) harness connector.

Note: Check connectors - Clean/repair as necessary.

Measure the resistance between ground and the 5-Volt Supply circuit.
Is the resistance below 100k ohms?
Yes >> Repair the 5-Volt Supply circuit for a short to ground. Perform ABS VERIFICATION TEST. ABS Verification Test
No >> Go to 3

3. MEASURE THE RESISTANCE BETWEEN THE SENSOR GROUND CIRCUIT AND THE YAW RATE/ ACCELERATION SENSOR 5-VOLT SUPPLY CIRCUIT





With the ignition off. Measure the resistance between the 5-Volt Supply circuit and Sensor Ground circuit at the Yaw Rate/Acceleration Sensor harness connector.
Is the resistance below 100k ohms?
Yes >> Repair the 5-Volt Supply circuit for a short to the Sensor Ground circuit. Perform ABS VERIFICATION TEST. ABS Verification Test
No >> Go to 4

4. MEASURE THE RESISTANCE OF THE YAW RATE/ACCELERATION SENSOR 5-VOLT SUPPLY CIRCUIT





With the ignition off.
Measure the resistance of the 5-Volt Supply circuit from the Yaw Rate/
Acceleration Sensor harness connector to the CAB harness connector.
Is the resistance below 5.0 ohms?
Yes >> Replace the Controller Antilock Brake (CAB) Module. Perform ABS VERIFICATION TEST. ABS Verification Test
No >> Repair the Yaw Rate/Acceleration Sensor 5-Volt Supply circuit for an open. Perform ABS VERIFICATION TEST. ABS Verification Test