Diesel Data: Automotive Repair

C0460




DTC C0460

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

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

* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC C0460 39
- Steering Position Sensor Circuit Internal Electronic Failure

DTC C0460 42
- Steering Position Signal Initialization Not Accomplished

DTC C0460 4B
- Steering Position Signal Calibration Not Accomplished

DTC C0460 5A
- Steering Position Sensor Not Plausible - Steering Angle Sensor Offset Fault

DTC C0460 71
- Steering Position Sensor Invalid Serial Data Received

DTC C0460 72
- Steering Position Sensor Circuit Malfunction Rolling Count Invalid Signal

Diagnostic Fault Information






Circuit/System Description

The electronic brake control module (EBCM) supplies 12 V reference to the steering angle sensor and the multi-axis acceleration sensor. The EBCM receives serial data messages from both the steering wheel angle sensor and the multi-axis acceleration sensor.

The steering wheel angle sensor sends a serial data message to the EBCM representing 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 V.

Conditions for Setting the DTC

The EBCM detects the following steering angle sensor fault:

* Steering angle sensor is not calibrated.

* Steering angle sensor output signal is out of range.

* Steering angle sensor is reporting an internal electronic failure.

Action Taken When the DTC Sets

* The ABS indicator turns ON.

* The red brake warning indicator turns ON.

* The hill descent indicator turns ON, if equipped with hill hold.

* The traction/stability control indicator turns ON, if equipped with electronic stability control.

* The EBCM disables the ABS, the traction control and the electronic stability control for the duration of the ignition cycle.

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 40 consecutive drive cycles.

Diagnostic Aids

* Steering wheel angle sensor is not calibrated.

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

* Verify the steering wheel and steering wheel angle sensor is installed correctly.

* The vehicle should not pull in either direction while driving straight on a level surface.

* Confirm that all tires are of the proper size and that all are matching brands. Check and adjust all tires to the stated cold air pressure as identified on the tire placard. If a mis-sized or non-matching brand tire is present, inform the customer that in order for the vehicle stability enhanced system to function normally, tires need to be a uniform size and rolling diameter.

Reference Information

Schematic Reference

Antilock Brake System Schematics [1][2]Antilock Brakes / Traction Control Systems

Connector End View Reference

Component Connector End Views 1-2 Shift Solenoid (SS) Valve (MN5)

Description and Operation Reference

ABS Description and Operation Description and Operation

Electrical Information Reference

* Circuit Testing Circuit Testing

* Connector Repairs Connector Repairs

* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections

* Wiring Repairs Wiring Repairs

Scan Tool Reference

Control Module References Programming and Relearning for scan tool information

Circuit/System Verification

1. Verify that DTC U1500 00, U2142 00 or U2143 00 is not present.

If any of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle Diagnostic Trouble Code (DTC) List - Vehicle.

2. Verify that DTC C0460 42, C0460 4B or C0460 5A is not present.

If any of the DTCs are present, perform the Steering Angle Sensor Centering Procedures.

3. Ignition ON, observe the scan tool Steering Wheel Position parameter. The reading should correspond with the actual steering wheel position as the steering wheel is turned through its entire range of motion.

If the parameter does not correspond with the actual steering wheel position, refer to Circuit/System Testing.

4. 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 harness connector at the B99 Steering Wheel Angle Sensor.

2. Test for less than 10 ohms between the low reference circuit terminal 6 and ground.

If greater than specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K17 Electronic Brake Control Module.

3. Ignition ON, test for B+ between the 12 V reference terminal 1 and ground.

If less than the specified range, test the 12 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K17 Electronic Brake Control Module.

4. Disconnect the harness connector at the K17 Electronic Brake Control Module.

5. Ignition ON, test for less than 1 V between the signal circuit terminal 19 and ground.

If greater than the specified value, test the signal circuit for a short to voltage.

6. Test for less than 1 V between the signal circuit terminal 18 and ground.

If greater than the specified value, test the signal circuit for a short to voltage.

7. Ignition OFF, test for infinite resistance between the signal circuit terminal 19 and ground.

If not the specified value, test the signal circuit for a short to ground.

8. Test for infinite resistance between the signal circuit terminal 18 and ground.

If not the specified value, test the signal circuit for a short to ground.

9. Test for less than 2 ohms between the signal circuit terminal 19 at the K17 electronic brake control module harness connector and the signal circuit terminal 4 at the B99 Steering Wheel Angle Sensor.

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

10. Test for less than 2 ohms between the signal circuit terminal 18 at the K17 Electronic Brake Control Module harness connector and the signal circuit terminal 3 at the B99 Steering Wheel Angle Sensor.

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

11. If all circuits test normal, replace the B99 Steering Wheel Angle Sensor.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the repair.

* Steering Angle Sensor Replacement (NVH) Removal and Replacement

* Control Module References Programming and Relearning for EBCM replacement, programming and setup