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, 4B, 5A, 71, 72
Steering Wheel Position Signal Can Lo | C0460 00 | C0460 00 | -- | C0460 42, 4B, 5A, 71, 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.

• | The VSES indicator turns ON.

• | The driver indicator turns ON.

### 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

Antilock Brake System 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

Scan Tool Data List for EBCM

### 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. Ignition OFF, disconnect the harness connector at the steering angle sensor.
2. Test for less than 6 ohm of resistance between the low reference circuit terminal 6 and ground.

⇒ | If greater than the specified range, test for an open/high resistance in the low reference circuit. If the circuit tests normal, replace the EBCM.

3. Ignition ON, test for 11.8-12.2 volts between the 12-volt reference circuit terminal 1 and ground.

⇒ | If less than the specified range, test the 12-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the EBCM.

⇒ | If greater than the specified range, test the 12-volt reference circuit for a short to voltage. If the circuit tests normal, replace the EBCM.

4. Ignition OFF, disconnect the harness connector at the EBCM.
5. Ignition ON, test for 0 volts between the communication circuit terminal 18 and ground.

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

6. Test for 0 volts between the communication circuit terminal 19 and ground.

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

7. Ignition OFF, test for infinite resistance between the communication circuit terminal 18 and ground.

⇒ | If not the specified value, test the communication circuit for a short to ground.

8. Test for infinite resistance between the communication circuit terminal 19 and ground.

⇒ | If not the specified value, test the communication circuit for a short to ground.

9. Test for less than 1 ohm of resistance between the communication circuit terminals 18 and terminal 3.

⇒ | If greater than the specified range, test the communication circuit for an open/high resistance.

10. Test for less than 1 ohm of resistance between the communication circuit terminals 19 and terminal 4.

⇒ | If greater than the specified range, test the communication circuit for an open/high resistance.

11. Test for infinite resistance between the communication circuit 18 and the communication circuit 19.

⇒ | If not the specified value, test the communication circuits for a short together.

12. If all circuits test normal, replace the Steering Angle Sensor.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• | Steering Angle Sensor Centering

• | Diagnostic Test Drive

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