REMOVAL AND INSTALLATION


caution
  • When the engine-ECU 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 M.U.T.-III (Refer to GROUP 42B - Troubleshooting, ID Code Registration Necessity Judgment Table ) <Vehicle with KOS installed> (Refer to GROUP 42C - Troubleshooting, ID Code Registration Necessity Judgment Table ) <Vehicle with WCM installed>.
  • After the engine-ECU replacement, idling speed may be unstable because the MPI engine learning is not completed. To make it stable, let the system learn the idling (Refer to GROUP 00 - Precautions before Service, Learning Procedure for Idling in MPI Engine ).
  • After the replacement of the engine-ECU, register a key code using M.U.T.-III (Refer to GROUP 00 - Precautions before Service, How to Perform Chassis Number Writing ).
  • When the engine-ECU is replaced, save the chassis number and perform the variant coding.
  • For replacement of the engine-ECU, save and write the initial learned value of the timing chain elongation using the M.U.T.-III. (Refer to GROUP 00 - Precautions before Service - Timing Chain Maintenance .)
Pre-removal and post-installation operation
  • Air Cleaner Assembly Removal and Installation (Refer to GROUP 15 - Air Cleaner ).

<Except vehicles for England>

Removal steps

>>B<<
 ·
 Initialisation operation (only at installation)


1.
 Engine-ECU connector


2.
 ECU stay


3.
 Engine-ECU and Engine-ECU bracket assembly


4.
 Engine-ECU bracket


5.
 Engine-ECU

<Vehicles for England>

Removal steps

>>B<<
 ·
 Initialisation operation (only at installation)
<<A>>
 >>A<<
 1.
 Brake off bolt


2.
 Connector cover


3.
 Engine-ECU connector connection


4.
 Engine control modulator stay


5.
 Engine-ECU and engine control modulator bracket
<<A>>
 >>A<<
 6.
 Brake off bolt


7.
 Engine control modulator bracket


8.
 Engine-ECU

REMOVAL SERVICE POINT

<<A>> BREAK OFF BOLT REMOVAL <VEHICLES FOR ENGLAND>

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 BOLT INSTALLATION <VEHICLES FOR ENGLAND>
Tighten the break off bolt until its head is broken off.

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