Circuit Description
The electric power steering (EPS) system uses a torque sensor to detect the amount of torque being applied to the steering column shaft when the steering wheel is turned. The power steering control module (PSCM) uses this sensor as it's main input in determining the amount of steering assist needed.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC C0545 Steering Wheel Torque Input Sensor
Condition for Running the DTC
The ignition and the engine are ON.
Condition for Setting the DTC
| • | The PSCMs torque sensor input is greater than 20.7 N·m (15.2 lb ft) during a right turn. |
| • | The PSCMs torque sensor input is less than -20.7 N·m (15.2 lb ft) during a left turn. |
| • | The difference between the 2 torque sensor coils is greater than 2.4 N·m (1.7 lb ft). |
Action Taken When the DTC Sets
| • | A DTC C0545 is stored in memory. |
| • | The instrument panel cluster (IPC) message center displays the PWR STR warning message. |
| • | No steering assist is provided. |
Conditions for Clearing the DTC
| • | A current DTC will clear on the next malfunction-free ignition cycle. |
| • | A history DTC will clear after 100 consecutive malfunction-free ignition cycles. |
| • | Using a scan tool |
Diagnostic Aids
The torque sensor is hard wired to the PSCM, thus no connector or circuit testing can be performed. If an intermittent malfunction is suspected with the torque sensor, or the circuits to the torque sensor, replace the EPS assembly. Refer to Steering Column Replacement in Steering Wheel and Column. The scan tool can be used to view the torque sensor value.
Test Description
The number below refers to the step number on the diagnostic table.
Step | Action | Values | Yes | No |
|---|---|---|---|---|
Schematic Reference: Power Steering Schematics Connector End View Reference: Power Steering Connector End Views | ||||
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
Does the scan tool indicate that the Steering Shaft Torque data parameter changes state while turning the steering wheel and is less than the specified value? | 20.70 N·m (15.2 lb ft) | Go to Diagnostic Aids | Go to Step 3 | |
3 | Replace the EPS assembly. Refer to Steering Column Replacement in Steering Wheel and Column. Did you complete the repair? | -- | Go to Step 4 | -- |
4 |
Does the DTC reset? | -- | Go to Step 2 | System OK |
