Engine Control Module: Service and Repair

REMOVAL




The Engine Control Module (ECM) (16) is bolted to a support bracket near the fuel filter. The support bracket mounts to the block with four capscrews and vibration isolators. A ground wire is fastened to the bracket. The other end of the wire is fastened to the engine block.

1. Record any Diagnostic Trouble Codes (DTC's) found in the ECM.

To avoid possible voltage spike damage to the ECM, ignition key must be off, and both negative battery cables must be disconnected before unplugging ECM connectors.

2. Disconnect both negative battery cables at both batteries.
3. Remove the 50-way and 60-way connector bolts at the ECM.

NOTE: The connector bolt is a female allen head. As bolt is being removed, very carefully remove connectors from the ECM.

4. Remove five ECM mounting bolts and remove ECM from vehicle.

INSTALLATION




Do not apply paint to ECM or a poor ground will result.
1. Position the ECM (16) to the ECM support bracket and install the five mounting bolts. Tighten bolts to 24 N.m (18 ft. lbs.).
2. Check pin connectors in ECM, 50-way and 60-way connectors for corrosion or damage. Repair as necessary.
3. Clean pins in the 50-way and 60-way electrical connectors with a electrical contact cleaner.
4. Install the 50-way and 60-way connectors to ECM. Tighten connector bolts to 3 N.m (27 in. lbs.).
5. Reconnect both negative battery cables.
6. Use a diagnostic scan tool to erase any Diagnostic Trouble Codes (DTC's) from ECM.