The electronic brake control module (EBCM) supplies a reference voltage of 5 volts to the yaw rate sensor/lateral accelerometer, the steering wheel position sensor and the master cylinder pressure sensor. The sensor supply voltage is monitored via an internal feedback circuit to the EBCM microprocessor.
This diagnostic procedure supports the following DTCs:
• | DTC C0290 Devise Voltage Reference Output Circuit |
• | DTC C0292 Devise Voltage Reference Input Circuit |
The ignition is ON.
The EBCM detects that the sensor supply voltage is less than 4.75 volts or greater than 5.25 volts for 30 milliseconds.
• | The EBCM disables the vehicle stability enhancement system (VSES). |
• | The stability system caution indicator turns ON. |
The numbers below refer to the step numbers on the diagnostic table.
This step tests for a shorted yaw rate sensor/lateral accelerometer or steering wheel position sensor.
This step tests for a shorted master cylinder pressure sensor. The presence of DTC C0110 is normal during this step.
Step | Action | Yes | No | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Schematic Reference: Antilock Brake System Schematics Connector End View Reference: Antilock Brake System Connector End Views | |||||||||||||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | |||||||||||
2 |
Does the DTC reset? | Go to Step 3 | Go to Diagnostic Aids | ||||||||||
3 |
Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 12 | Go to Step 4 | ||||||||||
4 |
Did you find and correct the condition? | Go to Step 12 | Go to Step 5 | ||||||||||
Does the DTC reset? | Go to Step 6 | Go to Step 8 | |||||||||||
Does the DTC reset? | Go to Step 11 | Go to Step 7 | |||||||||||
7 | Replace the BPMV. Refer to Control Module References . Did you complete the replacement? | Go to Step 12 | -- | ||||||||||
8 | Reconnect the steering wheel position sensor harness connector. Does the DTC reset? | Go to Step 10 | Go to Step 9 | ||||||||||
9 |
Important: Replace the lateral accelerometer/yaw rate sensor. Use the scan tool to perform a Yaw Rate Sensor Recalibration procedure. Replace the yaw rate sensor/lateral accelerometer. Refer to Vehicle Yaw Sensor with Vehicle Lateral Accelerometer Replacement . Did you complete the replacement? | Go to Step 12 | -- | ||||||||||
10 | Replace the steering wheel position sensor. Refer to Steering Wheel Position Sensor or Steering Shaft Lower Bearing Replacement . Did you complete the replacement? | Go to Step 12 | -- | ||||||||||
11 |
Important: Following EBCM replacement, perform the setup procedure for the EBCM. Use the scan tool to perform the Tire Size Calibration procedure. Replace the EBCM. Refer to Control Module References . Did you complete the replacement? | Go to Step 12 | -- | ||||||||||
12 |
Does the DTC reset? | Go to Step 3 | System OK |