Power Steering Control Module (PSCM) Replacement and Setup
The following service procedures require either a programming or a setup event performed for a complete repair.
If the power steering control module (PSCM) is replaced, the following procedures must be performed in the following order:
- PSCM reprogramming--Refer to Service Programming System (SPS) .
- Steering Position/Torque Sensor Calibration
Power Steering Motor or Torque Sensor Replacement
Important: The power steering motor is serviced separately from the steering gear. However, the torque sensor is serviced as part of the steering gear assembly.
After replacing either the steering gear assembly or the power steering motor, only the Steering Position/Torque Sensor Calibration procedure must be performed. Certain steering symptoms can be corrected by performing the Steering Position/Torque Sensor Calibration procedure such as:
| • | Poor, or uneven return to center |
| • | Poor, or uneven on center feel |
Steering Position/Torque Sensor Calibration
Important: Since there is no steering assist while performing this procedure, the procedure might be easier to accomplish if the vehicle is raised slightly off the ground using a hoist. Follow all on-screen instructions displayed on the scan tool in order of appearance.
- Install the scan tool.
- Engine ON.
- With the scan tool select Chassis, Power Steering Control Module and then Special Functions.
- Center the steering wheel.
- Turn the steering wheel 90 degrees from center to the right, and 90 degrees from center to the left, return the steering wheel to center.
- With the steering wheel centered, remove hands from the steering wheel and then press the calibrate key. The steering wheel may vibrate slightly for approximately 2-3 seconds.
- Wait until the scan tool screen displays "Calibration Complete". If the scan tool displays "Procedure Incomplete", repeat the calibration procedure.
- Press the exit key. Verify there is no uneven steering feel by turning the steering wheel from left to right. If the steering feel seems uneven as the steering wheel is turned in either direction, repeat the calibration procedure.
- Use the scan tool in order to clear any PSCM DTCs.
- Turn OFF the ignition.
Important: After centering the steering wheel, remove hands and other objects from the steering wheel and ensure the suspension is relaxed and no bias, or uneven force is being applied to the steering system.
Important: After turning OFF the ignition, allow 25 seconds of wait time before performing any procedures that require the vehicles battery to be disconnected, or module memory loss may occur.
