How to Troubleshoot the Fuel and Emissions Systems
How to End a Troubleshooting Session (required after any troubleshooting)
  1. Reset the ECM with the HDS.
  1. Do the ECM idle learn procedure.
  1. Turn the ignition switch to LOCK (0).
  1. Disconnect the HDS from the DLC.
    NOTE: The ECM is part of the immobilizer system. If you replace the ECM, it will have a different immobilizer code. In order for the engine to start, you must rewrite the immobilizer code with the HDS (immobilizer system section).