For 1990-2009 cars

### Diagnostic Instructions

• | Perform the Diagnostic System Check - Vehicle prior to using the diagnostic procedure.

• | Review Strategy Based Diagnosis for an overview of the diagnostic approach.

• | Diagnostic Procedure Instructions provides an overview of each diagnostic category.

### DTC Descriptors

DTC C0460 39: Steering Position Sensor Circuit Malfunction
DTC C0460 5A: Steering Position Sensor
DTC C0460 71: Steering Position Sensor Data Error
DTC C0460 72: Steering Position Sensor Circuit Malfunction

### Circuit/System Description

The steering angle sensor shares a 12 V ignition supply voltage with the electronic brake control module (EBCM) and the yaw-rate sensor. The EBCM applies a ground to the steering angle sensor low reference circuit, which is shared with the yaw-rate sensor.

The steering angle sensor provides a serial data signal output to the EBCM that represents the steering wheel degree of rotation. The EBCM utilizes this signal to calculate the driver intended driving direction.

### Conditions for Running the DTC

The ignition is ON.

### Conditions for Setting the DTC

The EBCM detects the following steering angle sensor fault:

• | Steering angle sensor internal failure

• | Steering angle sensor output signal out of range

• | Steering angle sensor not calibrated

### Action Taken When the DTC Sets

• | The EBCM disables the ABS-TCS/ESP for the duration of the ignition cycle

• | One or all of the following warning indicators may activate:

- | ABS-TCS warning indicator

- | ABS-TCS warning display

- | ESP warning display

- | Brake failure indicator

- | Trac-off warning display

### Conditions for Clearing the DTC

• | The current DTC moves into history when there is no current logged during the self-test.

• | The DTC is cleared with a scan tool.

### Reference Information

#### Schematic Reference

Antilock Brake System Schematics

#### Connector End View Reference

Component Connector End Views

#### Electrical Information Reference

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

#### Scan Tool Reference

Scan Tool Data List

### Circuit/System Verification

1. With scan tool installed, calibrate the steering angle sensor.
2. Turn the ignition OFF for 10 seconds.
3. Drive the vehicle in a straight ahead direction for 15 minutes. If the DTC did not set as a current DTC see diagnostic aids.

### Circuit/System Testing

1. Ignition OFF, disconnect the steering angle sensor connector.
2. Test the steering angle sensor reference voltage circuit for a short to voltage, short to ground, an open or high resistance.

⇒ | If the reference voltage circuit did not test normal, repair the circuit.

3. Test the steering angle sensor ground circuit for an open or high resistance.

⇒ | If the reference ground circuit did not test normal, repair the circuit.

4. Test the steering angle sensor CAN HI and LO circuit for a short to voltage, short to ground, an open or high resistance.

⇒ | If the steering angle sensor CAN HI and LO circuits did not test normal repair the circuit.

⇒ | If the steering angle sensor CAN HI and LO circuits tested normal, replace the steering angle sensor.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• | Steering Wheel Position Sensor Replacement

• | Steering Wheel Position Sensor Centering