Engine Control Module (ECM)
ENGINE CONTROL MODULE (ECM)REMOVAL AND INSTALLATION
CAUTION:
- When replacing the engine control module (ECM), do not replace the immobilizer-ECU (WCM) or KOS-ECU at the same time with ECM. When replacing multiple ECUs, always replace only one ECU at a time and complete necessary ID registration using the scan tool. (Refer to Keyless Operation System (KOS) - Diagnosis, ID Code Registration Judgment Table.)
- After the engine control module (ECM) replacement, idling speed may be unstable because the MFI engine learning is not completed. To make it stable, let the system learn the idling. (Refer to General (Body and Chassis), Precautions Before Service - Learning Procedure for Idling in MFI Engine)
- After the engine control module (ECM) replacement, register a key code using the scan tool (Refer to General (Body and Chassis) - Precautions Before Service, How to Perform Vehicle Identification Number (VIN) Writing).
- When replacing the engine control module (ECM), be sure to use an engine control module (ECM) with which the vehicle identification number writing and coding are completed. If diagnostic trouble code No. P0630 vehicle identification number-related or No. P1676 variant coding-related is set in the engine control module (ECM), replace it with an engine control module (ECM) to which the same vehicle identification number has been entered and the same coding has been made.
- When the engine control module (ECM) is replaced, the initial learning value of timing chain elongation amount must be stored and written by using the scan tool (Refer to General (Body and Chassis) - Precautions Before Service, Timing Chain Maintenance).
Pre-Removal And Post-Installation Operation:
Removal Steps 1-7 (Part 1):
Removal Steps 1-7 (Part 2):
REMOVAL SERVICE POINT
[[A]] BREAK-OFF BOLTS REMOVAL
1. Drill in the break-off bolt a hole deep enough for the tap to stand.
2. Remove the break-off bolt with a left-hand tap.
INSTALLATION SERVICE POINTS
]]A[[ BREAK-OFF BOLTS INSTALLATION
Tighten until the head of break-off bolt is broken off.
]]B[[ INITIALIZATION OPERATION
Turn the ignition switch to the "ON" and then to "LOCK" (OFF) position and hold it for at least 10 seconds.