Engine Control Module (ECM) Replacement

ENGINE CONTROL MODULE (ECM) REPLACEMENT

Service of the engine control module (ECM) should consist of either replacement of the ECM or programming of the electrically erasable programmable read only memory (EEPROM). If the diagnostic procedures call for the ECM to be replaced, the replacement ECM should be checked to ensure that the correct part is being used. If the correct part is being used, remove the faulty ECM and install the new service ECM. The replacement ECM must be programmed.

Removal Procedure
1. Using a scan tool, retrieve the percentage of remaining engine oil. Record the remaining engine oil life.

IMPORTANT: It is necessary to record the remaining engine oil life. If the replacement module is not programed with the remaining engine oil life, the engine oil life will default to 100%. If the replacement module is not programmed with the remaining engine oil life, the engine oil will need to be changed at 5000 km (3,000 mi) from the last engine oil change.

2. Disconnect the negative battery cable.
3. Disconnect the cooling fan electrical connector for additional clearance while removing the ECM.




4. Depress the ECM/transmission control module (TCM) cover retainers (2).
5. Remove the ECM/TCM cover from the ECM/TCM bracket (1).




6. Disconnect the ECM electrical connectors (2) from the ECM (1)

IMPORTANT: It is not necessary to disconnect the ECM electrical connectors in order to remove the ECM from the ECM/TCM bracket. Only disconnect the electrical connectors if servicing of component requires disconnecting of the electrical connectors.

NOTE: Refer to Handling ESD Sensitive Parts Notice in Service Precautions.

IMPORTANT: Remove any debris from around the ECM connector surfaces before servicing the ECM. Inspect the ECM module connector gaskets when diagnosing or replacing the ECM. Ensure that the gaskets are installed correctly. The gaskets prevent contaminant intrusion into the ECM.




7. Release the bracket ECM retainers (1).
8. Tilt the ECM (2) away from the ECM/TCM bracket.




9. Remove the ECM (2) from the ECM bracket (1).




10. Only when replacement of the ECM/TCM bracket (2) is necessary, remove the TCM (1).




11. Remove the ECM/TCM bracket retaining bolts (2).
12. Remove the ECM/TCM bracket (1) from the vehicle frame.

Installation Procedure
1. If the ECM/TCM bracket (1) was previously removed, install the ECM/TCM bracket (1) to the vehicle frame.




2. Install the ECM/TCM bracket retaining bolts (2).
3. Tighten the ECM/TCM bracket bolts.

NOTE: Refer to Fastener Notice in Service Precautions.

Tighten the bolts to 10 N.m (89 lb in).




4. If the TCM was previously removed from the ECM/TCM bracket (2), install the TCM (1).




5. Insert the ECM (2) into the retaining slots of the ECM/TCM bracket (1).




6. Secure the ECM (2) to the ECM/TCM mounting bracket ensuring the ECM retaining tabs (1) are fully engaged.




7. Connect the ECM electrical connectors (2) to the ECM (1) if previously removed.




8. Install the ECM/TCM cover (2) to the ECM/TCM bracket (1).
9. Ensure the ECM/TCM cover retainers (2) are fully engaged with the ECM/TCM bracket (1).
10. Connect the cooling fan electrical connector.
11. Connect the negative battery cable.
12. If the ECM was replaced the replacement ECM must be programmed. Programming and Relearning