Engine Control Module: Service and Repair

ENGINE CONTROL MODULE (ECM) REPLACEMENT

REMOVAL PROCEDURE

NOTE: Always turn the ignition off when installing or removing the ECM connectors in order to prevent damage to the components.

1. Turn the ignition OFF.

IMPORTANT: Ensure That There Is No Main Relay Circuit Voltage (ecm Fuse).




2. Use a DVOM in order to measure the main relay circuit voltage at the ECM fuse in the underhood fuse block.
3. Disconnect the battery negative cable.
4. Remove the ECM fuse in the underhood fuse block.
5. Remove the TCM/IPC fuse in the underhood fuse block.
6. Remove the ECM/TCM fuse in the underhood fuse block.
7. Unlock the chassis side (upper) ECM electrical connector.
7.1. Depress the ECM electrical connector lever lock (1).
7.2. Simultaneously rotate the ECM connector clamp lever and depress the lock slide (2).

NOTE: In order to prevent any possible electrostatic discharge damage to the ECM, do not touch the connector pins.




8. Remove the body side (upper) ECM connector.




9. Unlock and remove the engine side (lower) ECM connector.




10. Remove the ECM redundant ground wire and bolt (2) from the ECM.




11. Remove the ECM bolts.
12. Remove the ECM.
13. If you are replacing the ECM bracket, perform the following steps:




14. Remove the electrical connector bracket and bolt from the ECM bracket.




15. Remove the ground wire and bolt from the ECM bracket.




16. Remove the wire harness retainer and bolt from the side of the ECM bracket.




17. Remove the ECM bracket bolts (2 and 3).
18. Remove the ECM bracket (1).

INSTALLATION PROCEDURE




1. Install the ECM bracket (1).

NOTE: Refer to Fastener Notice in Service Precautions.

2. Install the ECM bracket bolts (2 and 3).

Tighten
1. Tighten the ECM bracket bolt (2) to 10 N.m (89 lb in).
2. Tighten the ECM bracket bolts (3) to 23 N.m (17 lb ft).




3. Install the wire harness retainer and bolt (2) to the side of the ECM bracket.

Tighten
Tighten the wire harness retainer bolt to 23 N.m (17 lb ft).




4. Install the electrical connector bracket and bolt to the ECM bracket.

Tighten
Tighten the electrical connector bracket bolt to 10 N.m (89 lb in).




5. Install the wiring harness ground wire and bolt to the ECM bracket.

Tighten
Tighten the wiring harness ground wire bolt 10 N.m (89 lb in).

NOTE: In order to prevent any possible electrostatic discharge damage to the ECM, do not touch the connector pins.




6. Install the ECM.
7. Install the ECM bolts.

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




8. Install the ECM redundant ground and bolt (2) to the ECM.

Tighten
Tighten the ECM redundant ground wire bolt to 5 N.m (44 lb in).




9. Install the engine side (lower) ECM connector.




10. Install the body side (upper) ECM connector.
11. Install the ECM/TCM fuse in the underhood fuse block.
12. Install the TCM/IPC fuse in the underhood fuse block.
13. Install the ECM fuse in the underhood fuse block.
14. Connect the battery negative cable to the battery.
15. Program the ECM. Refer to Service Programming System (SPS) in Programming. Programming and Relearning
16. Turn OFF the ignition for at least 5 seconds after the programming event is complete.
17. Perform the idle learn procedure. Refer to Idle Learn Procedure. Programming and Relearning
18. Use the scan tool to clear all DTCs.