The power steering control module (PSCM) continuously monitors the torque sensors input and output shaft sinusoidal voltage signals. As the steering wheel is turned and torsional twist is applied to the steering column shaft, the torque sensor's input and output shaft sinusoidal voltage signals are processed by the PSCM to detect and calculate the steering torque.

The ignition is ON.

The PSCM detects open, short to ground or short between any of the torque sensor circuits.

Schematic Reference:

Power Steering Schematics

Connector End View Reference:

Power Steering Connector End Views

Description and Operation:

Power Steering System Description and Operation

Electrical Information Reference:

Scan Tool Reference:

Ignition ON, turn the steering wheel left and right. Verify that DTC C0475 does not set.

1. Ignition OFF, disconnect the harness connector C3 at the PSCM.
2. Ignition OFF, test for between 2 and 20 ohms of resistance between the exciting circuit terminal 4 and the exciting ground circuit terminal 2 of the torque sensor.

⇒	If outside the specified range, test the exciting and exciting ground circuits for a short or an open/high resistance. If circuits test normal, replace the steering column.

3. Ignition OFF, test for between 100 and 500 ohms of resistance between the input SIN circuit terminal 8 and the torque sensor ground circuit terminal 1 of the torque sensor.

⇒	If outside the specified range, test the input SIN and the torque sensor ground circuits for a short or an open/high resistance. If circuits test normal, replace the steering column.

4. Ignition OFF, test for between 300 and 1000 ohms of resistance between the input COS circuit terminal 7 and the torque sensor ground circuit terminal 1 of the torque sensor.

⇒	If outside the specified range, test the input COS and the torque sensor ground circuits for a short or an open/high resistance. If circuits test normal, replace the steering column.

5. Ignition OFF, test for between 50 and 200 ohms of resistance between the output SIN circuit terminal 6 and the torque sensor ground circuit terminal 1 of the torque sensor.

⇒	If outside the specified range, test the output SIN and the torque sensor ground circuits for a short or an open/high resistance. If circuits test normal, replace the steering column.

6. Ignition OFF, test for between 200 and 800 ohms of resistance between the output COS circuit terminal 5 and the torque sensor ground circuit terminal 1 of the torque sensor.

⇒	If outside the specified range, test the output COS and the torque sensor ground circuits for a short or an open/high resistance. If circuits test normal, replace the steering column.

7. Ignition OFF, test for greater than 1.0 Mega-ohm of resistance between the exciting ground circuit terminal 2 and the torque sensor ground terminal 1.

⇒	If less than the specified range, test the exciting ground circuit for a short to the torque sensor ground circuit. If circuits test normal, replace the steering column.

8. Ignition OFF, test for greater than 1.0 Mega-ohm of resistance between the torque sensor ground circuit terminal 1 and ground.

⇒	If less than the specified range, test the torque sensor ground circuit for a short to ground. If circuits test normal, replace the steering column.

9. Ignition OFF, test for greater than 1.0 Mega-ohm of resistance between the exciting ground circuit terminal 2 and ground.

⇒	If less than the specified range, test the exciting ground circuit for a short to ground. If circuits test normal, replace the steering column.

10. If all circuits test normal, test or replace the PSCM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.