Engine Control Module (ECM) Replacement

ECM Mounting:

ECM With PROM And Cal-Pak:

When replacing a production ECM with a service ECM, 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 being replaced and transferred to the new unit. Refer to PROM, CALPAK, and MEMCAL for procedures under COMPUTERIZED ENGINE CONTROLS.

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.