Turn ignition switch OFF and disconnect the battery negative (-) terminal.

Remove the battery.

(Refer to "Engine Electrical System" - Battery")

Disconnect the ECM Connector (A).

Remove the mounting bolts and nut, and then remove the ECM bracket assembly (B).

Remove the ECM (B) after loosening the mounting nuts (A) from the bracket.

Install in the reverse order of removal.

TEST ECM GROUND CIRCUIT: Measure resistance between ECM and chassis ground using the backside of ECM harness connector as ECM side check point. Repair any problem found.

TEST ECM CONNECTOR: Disconnect the ECM connector and visually check the ground terminals on ECM side and harness side for bent pins or poor contact pressure. Repair any problem found.

If problem could not be found in Steps 1 and 2, the ECM could be faulty. If so, make sure there is no DTC before replacing the ECM with a new one, and then check the vehicle again. If DTC is found, examine this first before replacing ECM.

RE-TEST THE ORIGINAL ECM: Install the original ECM (may be broken) into a known-good vehicle and check the vehicle. If the problem recurs, replace the original ECM with a new one. If the problem does not recur, this is an intermittent problem. (Refer to "Intermittent Problem Inspection Procedure" in Basic Inspection Procedure.)

After replacing the ECM of the vehicle by using the immobilizer, the following procedure must be performed.

[If installing a used ECM]

Perform "ECM Neutral Mode" procedure using GDS. (Refer to "Body Electrical System - "Immobilizer System - Repair procedures")

After finishing "ECM Neutral Mode", perform "Key Teaching" procedure using GDS. (Refer to "Body Electrical System - "Immobilizer System - Repair procedures")

[If installing a new ECM]

Perform "Key Teaching" procedure using GDS. (Refer to "Body Electrical System - "Immobilizer System - Repair procedures")

After replacing the ECM of the vehicle by using the smart key system (button start), the following procedure must be performed.

[If installing a used ECM]

Perform "ECM Neutral Mode" procedure using GDS. (Refer to "Body Electrical System - "Smart key System - Repair procedures")

After finishing "ECM Neutral Mode", turn IGN ON then OFF using the smart key or start button. Then the ECM learns information on the smart key automatically.

[If installing a new ECM]

Turn IGN ON then OFF using the smart key or start button. Then the ECM learns information on the smart key automatically.

Perform ETC module learning after replacing the ETC module.

(Refer to Electronic Throttle Control System - "Adjustment")