For 1990-2009 cars

### Diagnostic Instructions

• | Perform the Diagnostic System Check - Vehicle prior to using this 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 00: Steering Position Signal
DTC C0460 42: Steering Position Signal Initialization Not Accomplished
DTC C0460 4B: Steering Position Signal Calibration Not Accomplished
DTC C0460 5A: Steering Position Signal Not Plausible
DTC C0460 71: Steering Position Signal Internal Failure
DTC C0460 72: Steering Position Signal Rolling Count Invalid

### Diagnostic Fault Information

Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance
--- | --- | --- | --- | ---
Steering Wheel Position Sensor 12-Volt Reference Voltage | C0292 | C0292 | C0292 | --
Low Reference | C0460 00 | C0460 00 | -- | --
Steering Wheel Position Signal Can HI | C0460 00 | C0460 00 | -- | C0460 42, C0460 4B, C0460 5A, C0460 71, C0460 72
Steering Wheel Position Signal Can Lo | C0460 00 | C0460 00 | -- | C0460 42, C0460 4B, C0460 5A, C0460 71, C0460 72

### Circuit/System Description

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

• | Ignition voltage is greater than 9.5 volts.

### Conditions for Setting the DTC

• | Steering angle sensor is reporting an internal electronic failure.

• | Steering angle sensor has not been initialized.

• | Steering angle sensor offset is greater than 15 degrees.

### Action Taken When the DTC Sets

• | Vehicle stability enhancement system (VSES) are disabled.

• | A DIC message and/or a warning message may be displayed.

### Conditions for Clearing the DTC

• | The condition for the DTC is no longer present and the DTC is cleared with a scan tool.

• | The EBCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.

### Diagnostic Aids

• | If DTC C0292 is set, diagnose that DTC first.

• | A poor ground connection for the EBCM may cause this DTC to set.

### Reference Information

#### Schematic Reference

Antilock Brake System Schematics

#### Connector End View Reference

Component Connector End Views

#### Description and Operation

ABS Description and Operation

#### Electrical Information Reference

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

#### Scan Tool Reference

Control Module References for scan tool information

### Circuit/System Verification

1. Position the steering wheel to the straight-ahead, centered, position.
2. Install a scan tool, ignition ON, engine OFF, and view SWPS signal. One of the signals should be approximately 0-720 degrees.
3. As the steering wheel is turned, each signal should travel smoothly between 0 and 720 degrees.

### Circuit/System Testing

1. Verify that DTC C0186 or C0196 is not set

⇒ | If DTC C0186 or C0196 is set, refer to DTC C0186or DTC C0196

2. Ignition OFF, disconnect the harness connector at the EBCM.
3. Ignition ON, test for less than 1 volt between the circuit terminal of the appropriate circuit and ground.

• | Reference voltage circuit terminal 5

• | Reference ground circuit terminal 40

• | Serial Data circuit terminals 18 and 19

⇒ | If greater than the specified range, test the appropriate circuit for a short to voltage.

4. Ignition OFF, test for infinite resistance between the ignition voltage terminal of the appropriate sensor listed below and ground.

• | Reference voltage circuit terminal 5

• | Reference ground circuit terminal 40

• | Serial Data circuit terminals 18 and 19

⇒ | If less than the specified value, test the appropriate circuit for a short to ground.

5. Ignition OFF, disconnect the harness connector at the Steering Angle Sensor.
6. Ignition OFF, test for less than 2 ohms between the appropriate circuit terminals listed below.

• | Reference voltage circuit terminal 5 at the EBCM harness connector and terminal 1 at the Steering Angle Sensor harness connector.

• | Reference ground circuit terminal 40 at the EBCM harness connector and terminal 6 at the Steering Angle Sensor harness connector.

• | Communication circuit terminal 18 at the EBCM harness connector and terminal 3 at the Steering Angle Sensor harness connector.

• | Communication circuit terminal 19 at the EBCM harness connector and terminal 4 at the Steering Angle Sensor harness connector.

⇒ | If greater than the specified value, test the ignition voltage circuit for an open or high resistance.

7. If all circuits test normal, replace the Steering Angle Sensor. If the DTC resets replace the EBCM.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• | Steering Angle Sensor Centering

• | Control Module References for EBCM replacement, setup, and programming