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Programming and Relearning

Known-Good ECM/PCM Substitution
Use the following procedure if you need a known-good ECM/PCM to test a vehicle. It allows you to swap an ECM/PCM from a "donor" vehicle without having to program it to the test vehicle's ignition key.
1. Cut a temporary ignition key for the test vehicle with a non-immobilizer key blank.
2. Remove the ECM/PCM from the test vehicle.
3. Write the test vehicle's VIN on the ECM/PCM you just removed to avoid confusing it with the donor vehicle's ECM/PCM.
4. Remove the known-good ECM/PCM from the donor vehicle, and install it in the test vehicle.




5. Tape the donor vehicle's ignition key head-to-head to the test vehicle's temporary key. The ECM/PCM will recognize the code from the donor vehicle's key and allow you to start the engine with the temporary key.
6. After completing your tests, reinstall both ECM/PCMs, and destroy the temporary key.
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