Engine Control Module: Service and Repair

NOTE: Replacement ECM's are not equipped with engine calibration units (PROMs). If the PROM is to be reused, care should be taken when removing it from defective ECM. See Prom, Replace for proper removal procedure.


1. Disconnect battery ground cable.
2. Disconnect numbered and lettered connectors from ECM.
3. Remove ECM mounting hardware, then the ECM from the passenger compartment.
4. Reverse procedure to install.