Engine Control Module: Service and Repair

Removal

CAUTION:
- In the case of the vehicle equipped with immobilizer, perform "Key Teaching" procedure together .

1. Turn ignition switch OFF and disconnect the negative (-) battery cable.
2. Disconnect the ECM connector (A).




3. Remove the bracket installation bolts (A) and the nut (B).




4. Remove the installation bolts (A), and then remove the ECM from the bracket.






Installation

CAUTION:
- In the case of the vehicle equipped with immobilizer, perform "Key Teaching" procedure together .

Installation is reverse of removal.

ECM installation nut:
9.8 - 11.8 N.m (1.0 - 1.2 kgf.m, 7.2 - 8.7 lb-ft)
ECM bracket installation bolt:
19.6 - 29.4 N.m (2.0 - 3.0 kgf.m, 14.5 - 21.7 lb-ft)
ECM bracket installation nut:
7.8 - 11.8 N.m (0.8 - 1.2 kgf.m, 5.8 - 8.7 lb-ft)

ECM Problem Inspection Procedure

1. TEST ECM GROUND CIRCUIT: Measure the voltage drop between ECM and chassis ground using the backside of ECM harness connector. The ECM harness should be connected to the ECM and the ECM must be powered up. If the problem is found, repair it.

Specification:below 1Ohms

2. 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. If the problem is found, repair it.
3. If problem is not found in Step 1 and 2, the ECM could be faulty. If so, replace the ECM with a new one, and then check the vehicle again. If the vehicle operates normally then the problem was likely with the ECM.
4. RE-TEST THE ORIGINAL ECM : Install the original ECM (may be broken) into a known-good vehicle and check the vehicle. If the problem occurs again, replace the original ECM with a new one. If problem does not occur, this is intermittent problem

VIN Programming Procedure
VIN (Vehicle Identification Number) is a number that has the vehicle's information (Maker, Vehicle Type, Vehicle Line/Series, Body Type, Engine Type, Transmission Type, Model Year, Plant Location and so forth. For more information, please refer to the group "GI" in this SERVICE MANUAL). When replacing an ECM, the VIN must be programmed in the ECM. If there is no VIN in ECM memory, the fault code (DTC P0630) is set.

CAUTION:
The programmed VIN cannot be changed. When writing the VIN, confirm the VIN carefully

1. Select "VIN Writing" function in "Vehicle S/W Management".
2. Select "Write VIN" in "ID Resister".




3. Input the VIN.

WARNING:
Before inputing the VIN, confirm the VIN again because the programmed VIN cannot be changed.




4. Turn the ignition switch OFF, then back ON.