The steering wheel position sensor supplies 2 analog inputs, Phase A and Phase B, to the electronic brake control module (EBCM). The 2 input signals are approximately 90 degrees out of phase. By interpreting the relationship between the 2 inputs, the EBCM can determine the position of the steering wheel and the direction of the steering wheel rotation.
This diagnostic procedure supports the following DTCs:
• | DTC C0460 Steering Position Sensor |
• | DTC C0461 Steering Position Sensor Range/Performance |
The ignition is ON.
One of the following conditions exists:
• | Both Phase A and Phase B are greater than 4.9 volts or less than 0.2 volt for 1.6 seconds. |
• | The angle change in Phase A or Phase B is greater than 36 degrees between 2 consecutive signal samples. |
The difference in the phase angle between Phase A and Phase B is greater than 16 degrees continuously for 0.25 second.
If equipped, the following actions will occur:
• | The EBCM disables vehicle stability enhancement system (VSES) for the duration of the ignition cycle. |
• | The driver information center (DIC) displays the Service Stability System message. |
• | A current DTC will clear when the malfunction is no longer present. |
• | A history DTC will clear after 100 consecutive malfunction free ignition cycles or when the scan tool Clear DTCs function is used. |
Thoroughly inspect connections or circuitry that may cause an intermittent malfunction. Refer to the following in Wiring Systems:
The numbers below refer to the step numbers on the diagnostic table.
This step test the circuitry in the high voltage range.
This step test the circuitry in the low voltage range.
This step tests the low reference circuit of the steering wheel position sensor.
Step | Action | Values | 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 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
2 |
Does the DTC reset? | -- | Go to Step 3 | Go to Diagnostic Aids |
Does the scan tool indicate that the Steering Wheel Position Sensor Data parameter is less than specified value? | 0.2 V | Go to Step 4 | Go to Step 9 | |
Does the scan tool indicate that the steering wheel position sensor data parameter is greater than specified value? | 4.8 V | Go to Step 5 | Go to Step 6 | |
Use a DMM to measure the voltage between the steering wheel position 5-volt reference circuit and the steering wheel position low reference circuit. Does the voltage measure greater than the specified value? | 4.8 V | Go to Step 10 | Go to Step 8 | |
6 | Test the 5-volt reference circuit of the steering wheel position sensor for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 14 | Go to Step 7 |
7 | Test the signal circuit of the steering wheel position sensor for an open or a short to ground. Refer to Testing for Short to Ground and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 14 | Go to Step 11 |
8 | Test the low reference circuit of the steering wheel position sensor for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 14 | Go to Step 11 |
9 | Test the signal circuit of the steering wheel position sensor for a short to voltage. Refer to Testing for Short to Ground and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 14 | Go to Step 13 |
10 | Inspect for poor connections at the harness connector of the steering wheel position sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 14 | Go to Step 12 |
11 | Inspect for poor connections at the harness connector of the electronic brake control module (EBCM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 14 | Go to Step 13 |
12 | Replace the steering wheel position sensor. Refer to Steering Wheel Position Sensor or Steering Shaft Lower Bearing Replacement in Steering Wheel and Column. Did you complete the replacement? | -- | Go to Step 14 | -- |
13 | Replace the EBCM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement? | -- | Go to Step 14 | -- |
14 |
Does the DTC reset? | -- | Go to Step 2 | System OK |