C047A
DTC C047A
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 Descriptor
DTC C047A
- Electric Steering Motor Position Sensor Circuit
Circuit/System Description
The power steering control module continuously monitors the motor position sensor voltage signals. The voltage signals of the motor position sensor and the digital torque sensor index current signal are both processed by the power steering control module to detect and calculate the steering wheel angle.
Conditions for Running the DTC
The vehicle is ON or in SERVICE MODE.
Conditions for Setting the DTC
The power steering control module detects a short to ground, short to voltage, or an open/high resistance on any of the internal motor position sensor circuits, or a plausibility error as a result of a mismatch between the steering angle data from the internal steering angle sensor in the gear versus the external steering angle sensor data on the steering column.
Action Taken When the DTC Sets
* No steering assist.
* The driver information center displays the SERVICE POWER STEERING warning message.
Conditions for Clearing the DTC
* A current DTC will clear on the next malfunction-free ignition cycle.
* A history DTC will clear after 40 consecutive malfunction-free ignition cycles.
Diagnostics Aids
A communication error between the Electronic Brake Control Module and Power Steering Control Module can cause DTC C047A to set in history and display Service Power Steering warning message. Do not replace the steering gear or power steering control module if DTC C047A is set in history. If DTC C047A is current, follow the Circuit/System Testing for proper diagnosis.
Reference Information
Schematic Reference
Power Steering Schematics Electrical Diagrams
Connector End View Reference
Component Connector End Views Sunshade - Left
Description and Operation
Power Steering System Description and Operation (Electronic Power Steering) 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 Control Module References for scan tool information
Circuit/System Verification
1. Ignition ON.
2. With a scan tool, verify that DTC C0710 71 is not set.
• If DTC C0710 71 is set
Refer to DTC C0710 C0710 in Antilock Brake System Diagnostic Information and Procedures.
• If DTC C0710 71 is not set
3. With a scan tool verify that DTC C047A is not set.
• If the DTC is set
Refer to Circuit/System Testing below.
• If the DTC is not set
4. All OK.
Circuit/System Testing
1. Verify that the connector at the B137 Power Steering Shaft Torque Sensor is not damaged or have water intrusion/corrosion.
• The B137 Power Steering Shaft Torque Sensor connector is not OK
Replace the steering gear.
• The B137 Power Steering Shaft Torque Sensor connector is OK
2. With a scan tool perform the Power Steering Control Module Calibration procedure Steering Angle Sensor Centering and Software Endstop Learning. Refer to Power Steering Control Module Calibration Power Steering Control Module Calibration.
3. Verify that DTC C047A does not set.
• If the DTC does set
Replace the K43 Power Steering Control Module.
• If the DTC does not set
4. All OK.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Steering Gear Replacement (LUK, MHH) Steering Gear Replacement (LCV, MH8) Steering Gear Replacement (MH8)Steering Gear Replacement (LTG, M7W)
* Control Module References Control Module References for power steering control module replacement, programming and setup