Engine Control Module: Service and Repair

ENGINE CONTROL MODULE (ECM) REPLACEMENT

Engine control module (ECM) service should normally consist of either ECM replacement or electrically erasable programmable read only memory (EEPROM) programming. If the diagnostic procedures require ECM replacement, inspect the ECM first to see if the correct part is being used.

IMPORTANT:
- In order to prevent internal ECM damage, the ignition must be OFF when you disconnect or reconnect the power to the ECM. For example, disconnect the power when you work with the following components:
- A battery cable
- The ECM pigtail
- The ECM fuse
- Jumper cables
- When you diagnose or replace the ECM, remove any debris from the ECM connector surfaces before servicing the ECM module connector gaskets. Ensure that the gaskets are installed correctly. The gaskets prevent contamination intrusion into the 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. Remove the connector protection assurance (CPA) locks on each ECM electrical connector, then move the connector lock levers to the unlock position.
4. Disconnect the ECM electrical connectors.




5. Remove the two screws (1) securing the ECM to the mounting bracket
6. Remove the ECM.

Installation Procedure




1. Install the ECM to the mounting bracket.

NOTE:
- Do not touch the connector pins or soldered components on the circuit board in order to prevent possible electrostatic discharge (ESD) damage to the PCM.
- In order to prevent internal damage to the PCM, the ignition must be OFF when disconnecting or reconnecting the PCM connector.

2. Install the 2 screws (1) securing the ECM to the mounting bracket

NOTE: Refer to Fastener Notice in Service Precautions.

Tighten the ECM fasteners to 1-3 N.m




3. Install the ECM electrical connectors.
4. Connect the negative battery cable.
5. If a new ECM is being installed, program the ECM. Refer to Service Programming System (SPS) in Programming and Setup. Programming and Relearning
6. Whenever the ECM or the negative battery cables have been disconnected, the crankshaft variation procedure must be performed. Refer to CKP System Variation Learn Procedure.