Pcm Reprogramming
WARNING: This page is about a different car, the 2003 Saturn LW200 and 2003 Saturn L200. However, it is still accessible from the selected car via links, so may be relevant.
If a new PCM is being installed, it MUST be reprogrammed with new software and calibrations. Refer to SERVICE PROGRAMMING SYSTEM PASS-THRU PROCEDURE for reprogramming procedures. The PCM may be damaged if the reprogramming process is interrupted. Make sure scan tool is connected securely to the DLC and vehicle battery has a sufficient charge. Make sure the new PCM has the correct VIN and vehicle options.
After reprogramming the PCM, the PCM will have to learn the crankshaft notch variation for misfire diagnostics. Refer to CRANKSHAFT POSITION VARIATION LEARN PROCEDURE .