Engine Control Module (ECM) Repair Procedures

Removal

For a vehicle equipped with an immobilizer, the procedures shown below must be performed after replacing the ECM. [When installing a used ECM] 1) Perform the "ECM Neutral Mode" procedure using GDS. (Refer to "Immobilizer" in group BE) 2) After completing "ECM Neutral Mode," perform the "Key Learning" procedure using GDS. (Refer to "Immobilizer" in group BE) [When installing a new ECM] Perform the "Key Learning" procedure using GDS. (Refer to "Immobilizer" in group BE)

For a vehicle equipped with a Smart Key System (push button start), the procedures shown below must be performed after replacing the ECM. [When installing a used ECM] 1) Perform the "ECM Neutral Mode" procedure using GDS. (Refer to "Smart Key" in group BE) 2) After completing "ECM Neutral Mode," insert the key (or press the start button) and turn it to the IGN ON and OFF positions. The ECM then automatically receives the smart key information. [When installing a new ECM] Insert the key (or press the start button) and turn it to ignition ON and OFF. The ECM then automatically learns the smart key information.

1. 1
   Turn the ignition switch OFF and disconnect the negative (-) battery cable.
2. 2
   Remove the cover.
3. 3
   Disconnect the ECM connector (A) and the IDB connector (B).
4. 4
   Disconnect the TCM connector (C).

   

5. 5
   Remove the mounting bolts (A) and nut (B) of the ECM, TCM and IDB brackets.

   

6. 6
   Disconnect the TCM (B) from the bracket after loosening the mounting bolt (A).

   

7. 7
   Disconnect the ECM (B) from the bracket after loosening the mounting nut (A).

   

   

Installation

For a vehicle equipped with an immobilizer, perform the "Key Learning" procedure (Refer to "Immobilizer" in group BE).

1. To install, reverse the removal procedure.

   ECM mounting bolt: 9.8 - 11.8 N·m

ECM Circuit Inspection Procedure

1. 1
   ECM GROUND CIRCUIT INSPECTION: Measure the resistance between the ECM and chassis ground using the rear side of the ECM harness connector as the ECM-side checkpoint. If a problem is found, repair it.

   Specification: Below 1 Ω

2. 2
   ECM CONNECTOR INSPECTION: Disconnect the ECM connector and visually inspect the ground terminals on the ECM side and harness side for bent pins or poor contact tension. If a problem is found, repair it.
3. 3
   If the problem is not found in steps 1 and 2, the ECM may be faulty. If so, replace the ECM with a new one, then check the vehicle again. If the vehicle operates normally, the problem may have been found in the ECM.
4. 4
   RECHECK ORIGINAL ECM: Install the original ECM (possibly faulty) 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 occur, it is an intermittent problem (Refer to "Intermittent Problem Troubleshooting" in the "Basic Troubleshooting Procedure").