gmc Workshop Repair Guides

GMC Workshop Service and Repair Manuals

Relays and Modules - Fuel Delivery and Air Induction > < Engine Control Module (ECM) Replacement
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Engine Control Module: Service and Repair
Throttle Body Fuel Injection

When replacing a production ECM/PCM with a service ECM/PCM, transfer the broadcast code and production number from the production unit to the
service unit. Also during replacement, the PROM, CALPACK, and if equipped, the MEMCAL must be removed from the ECM/PCM being replaced
and transferred to the new unit. Refer to PROM, CALPAK and MEMCAL in this section for replacement procedures.

1.

Disconnect battery ground cable.

2.

Then disconnect two computer electrical connectors.

3.

Remove computer mounting hardware.

4.

Remove computer from passenger compartment.

5.

Reverse procedure to install.

Relays and Modules - Fuel Delivery and Air Induction > < Engine Control Module (ECM) Replacement