gmc Workshop Repair Guides

GMC Workshop Service and Repair Manuals

Idle/Throttle Speed Control Unit > < Engine Controls - ECM May Contain Wrong PROM|Page 49
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Engine Control Module: Service and Repair

1. Disconnect battery ground cable.
2. Disconnect two ECM electrical connectors.
3. Remove the ECM mounting hardware.
4. Remove ECM from passenger compartment.
5. Reverse procedure to install.

    
CAUTION:  Replacement ECM is supplied without engine calibration unit (PROM) and care must be taken when removing the PROM from a defective
ECM as it will be used in the replacement ECM.

Idle/Throttle Speed Control Unit > < Engine Controls - ECM May Contain Wrong PROM|Page 49