Removal and Replacement

ENGINE CONTROL MODULE (ECM)

REMOVAL AND INSTALLATION

CAUTION:
- When the ECM is replaced, do not replace the immobilizer ECU (WCM) or KOS-ECU simultaneously. When multiple ECUs are to be replaced, always replace only one ECU at a time and complete necessary ID registration using scan tool (Refer to Diagnosis - ID Codes Registration Judgment Table)[Vehicle with KOS installed] or (Refer to Diagnosis - ID Codes Registration Judgment Table) [Vehicle with WCM installed]
- After the replacement of the ECM, register a key code using scan tool MB991958 (Refer to Precautions before Service - How to Perform Vehicle Identification Number (VIN) Writing). How to Perform Vehicle Identification Number (VIN) Writing
- When the ECM is replaced, saved the vehicle identification number and perform the variant coding.
- When the ECM are replaced, make the battery current sensor calibration by using scan tool MB991958 (Refer to Precautions before Service, Battery Current Sensor Calibration). Battery Current Sensor Calibration
- After the 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 Precautions before Service - Engine Idling Learning Procedure) Learning Procedure for Idling in MFI Engine










REMOVAL SERVICE POINT

[[A]] BREAK-OFF BOLT REMOVAL [VEHICLES FOR CANADA]

1. [When using recommended tool screw extractor set (MB992678) or equivalent]







1. Drill in the break-off bolt a hole deep enough for the tap to stand.
2. Use recommended tool screw extractor set (MB992678) or equivalent to remove the break-off bolt.

2. [When using the flat-tipped screwdriver]







1. Apply force towards the direction to loose the bolt by a flat-tipped screwdriver.
2. Remove the break-off bolt.

INSTALLATION SERVICE POINTS

]]A[[ BREAK-OFF BOLT INSTALLATION [VEHICLES FOR CANADA]

Tighten until the head of break-off bolt is broken off.

]]B[[ INITIALIZATION OPERATION

Turn the ignition switch to the "ON" position and then to "LOCK" (OFF) position and hold it for at least 10 seconds.