Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Replace and Program ECU or Reprogram ECU
To program a replacement or an existing ECU, perform the following procedure:
During the procedures listed below, critical data is retrieved from vehicle components and stored in the scan tool computer's hard drive. This data is needed during the programming and setup sequences.
Ensure the same scan tool is used and capable of reading, storing, and writing the vehicle's system data.
- Install EL-49642 SPS programming support tool.
- Access the Service Programming System (SPS) and follow the on-screen instructions.
- On the SPS Supported Controllers screen, select Electronic Power Steering Control Module - Prepare Control Module for Removal and follow the on-screen instructions.NOTE:
Step 3 copies the worm gear wear counter data from the power steering control module PRIOR to the module's removal and stores it on the scan tool computer's hard drive.
AFTER completing step 3, the power steering control module can now be removed and replaced.
- Replace the Power Steering Assist Motor containing the Power Steering Control Module. Refer to Power Steering Assist Motor ReplacementNOTE:
The next two steps will transfer the vehicle's critical data, including the worm gear wear counter data saved in step 2, back to the vehicle components.
- On the SPS Supported Controllers screen, select Electronic Power Steering Control Module - Programming and follow the on-screen instructions.
- On the SPS Supported Controllers screen, select Electronic Power Steering Control Module - Setup and follow the on-screen instructions.
- Perform the Steering Angle Sensor Centering and Software Endstop Learning procedure.
- Clear all DTCs after completing the programming and setup procedures.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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