C0545
DTC C0545
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 C0545 00
- Steering Wheel Torque Input Sensor
DTC C0545 4B
- Steering Wheel Torque Input Sensor Calibration Not Learned
Circuit/System Description
The steering column shaft torque sensor is a 5-volt dual analog inverse signal device which is used to sense steering direction and the amount of torque being applied to the steering column shaft when the steering wheel is turned. The valid signal voltage range of the sensor is 0.25-4.75 volts. When applying torque to the steering column shaft during a right turn, the sensors signal 1 voltage increases, while the signal 2 voltage decreases within the valid signal voltage range. When applying torque to the steering column shaft during a left turn, the sensors signal 1 voltage decreases, while the signal 2 voltage increases within the valid signal voltage range.
After replacing the power steering control module (PSCM), the torque sensor must be calibrated.
Conditions for Running the DTC
C0545 00
* Engine Running
* Steering column shaft torque input is present.
C0545 4B
The ignition is ON.
Conditions for Setting the DTC
C0545 00
* The torque sensors signal 1/signal 2 voltages are less than 0.25 volt, or greater than 4.75 volts.
* A short to ground, short to voltage, or an open in the torque sensor, or the circuits to the sensor.
C0545 4B
The PSCM has not undergone the torque sensor calibration procedure.
Action Taken When the DTC Sets
* DTC is stored in memory.
* The DIC displays the POWER STEERING warning message.
* No steering assist is provided.
Conditions for Clearing the DTC
C0545 00, C0545 4B
* A current DTC will clear on the next malfunction-free ignition cycle.
* A history DTC will clear after 100 consecutive malfunction-free ignition cycles.
Reference Information
Schematic Reference
Power Steering Schematics (Electrical Diagrams)
Connector End View Reference
Component Connector End Views
Description and Operation
Power Steering System Description and Operation (EPS) (Power Steering System Description and Operation (EPS))Power Steering System Description and Operation (HPS) (Power Steering System Description and Operation (HPS))
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
Special Tools
EL-47564 Power Steering Control Module (PSCM) Test Harness
Circuit/System Verification
Ignition ON, observe the scan tool Torque Sensor Signal 1 and the Torque Sensor Signal 2 parameters. The reading should be between 0.25-4.75 volts.
Circuit/System Testing
1. Ignition OFF, disconnect the X1 harness connector at the power steering motor/module assembly.
2. Test for less than 1 ohm between the ground circuit terminal A and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
3. Disconnect the X3 harness connector at the power steering motor/module assembly.
4. Connect the EL-47564 Power Steering Control Module (PSCM) Test Harness.
5. Test for less than 1 ohm between the low reference circuit terminal and ground at the test harness connector.
• If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the power steering motor/module assembly.
6. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal and ground at the test harness connector.
• If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the power steering motor/module assembly.
• If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the power steering motor/module assembly.
7. Verify the scan tool torque sensor signal 1 parameter is greater than 4.75 volts.
• If less than the specified range, replace the power steering motor/module assembly.
8. Install a 3A fused jumper wire between the torque sensor signal 1 circuit terminal and the low reference circuit terminal at the test harness connector. Verify the scan tool steering position sensor signal 1 parameter is less than 0.25 volt.
• If greater than the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the power steering motor/module assembly.
9. Verify the scan tool torque sensor signal 2 parameter is greater than 4.75 volts.
• If less than the specified range, replace the power steering motor/module assembly.
10. Install a 3A fused jumper wire between the torque sensor signal 2 circuit terminal and the low reference circuit terminal at the test harness connector. Verify the scan tool steering position sensor signal 2 parameter is less than 0.25 volt.
• If greater than the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the power steering motor/module assembly.
11. If all circuits test normal, replace the torque/position sensor.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
* Power Steering Assist Motor Replacement (EPS) (Service and Repair)
* Steering Column Replacement (With Electronic Power Steering) (Steering Column Replacement (With Electronic Power Steering))Steering Column Replacement (With Hydraulic Power Steering) (Steering Column Replacement (With Hydraulic Power Steering))
* Control Module References for PSCM replacement, setup, and programming