gmc Workshop Repair Guides

GMC Workshop Service and Repair Manuals

Main Relay (Computer/Fuel System) > < Diagram Information and Instructions|Page 3797
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6. Connect the engine wiring harness electrical connectors (1) to the ECM.
7. Connect the negative battery cable.
8. If a NEW ECM was installed, program the ECM.  See: Testing and Inspection/Programming and Relearning
9. Using a scan tool, set the remaining engine oil life.

Main Relay (Computer/Fuel System) > < Diagram Information and Instructions|Page 3797