buick Workshop Repair Guides

Buick Workshop Service and Repair Manuals

Idle Speed Control Motor <--> [Idle/Throttle Speed Control Unit] > < Computer Command Control (C-3) System
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Engine Control Module: Service and Repair
Electronic Control Module (ECM) Replacement

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. 

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.

Idle Speed Control Motor <--> [Idle/Throttle Speed Control Unit] > < Computer Command Control (C-3) System