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Home >> Lexus >> 2021 >> LS 500 Base, AWD >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control System - Service Information >> ECM >> Removal [10/2023 - ] >> Caution / Notice / Hint
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Caution / Notice / Hint

The necessary procedures (adjustment, calibration, initialization or registration) that must be performed after parts are removed and installed, or replaced during ECM removal/installation are shown below.

NECESSARY PROCEDURES AFTER PARTS REMOVED/INSTALLED/REPLACED

Replaced Part or Performed Procedure Necessary Procedure Effect/Inoperative Function when Necessary Procedure not Performed Link
Disconnect cable from negative battery terminal Operate the multiplex network master switch assembly (retractable outer mirror switch) to extend and retract the outer rear view mirror assembly Parking support brake system Refer to INITIALIZATION [10/2023 - ]
Initialize rear door sunshade system Rear door sunshade system Refer to INITIALIZATION [12/2017 - ]
ECM Vehicle Identification Number (VIN) registration DTC P063051 is output Refer to REGISTRATION [12/2017 - ]
ECU configuration - Refer to ECU CONFIGURATION [10/2023 - ]
Update ECU security key Vehicle Control History (RoB) are stored Refer to UPDATE ECU SECURITY KEY [10/2023 - ]
Heavy Knock History 
  • Save history
  • Write history
- Refer to REGISTRATION [12/2017 - ]
Switch specification information Vehicle Control History (RoB) are stored Refer to INITIALIZATION [10/2023 - ]
Perform code registration Engine start Refer to REGISTRATION [10/2023 - ]
If possible to read the transmission compensation code from the previous ECM 
  • Transfer transmission compensation code (step 2)*1
  • Perform road test to allow ECM to learn
  • Large shift shock
  • Engine overruns
for AGA0E, Initialization:
Refer to INITIALIZATION [12/2017 - ]
for AGA0E, Registration:
Refer to REGISTRATION [12/2017 - ]
for AGA0F, Initialization:
Refer to INITIALIZATION [12/2017 - ]
for AGA0F, Registration:
Refer to REGISTRATION [12/2017 - ]
If impossible to read the transmission compensation code from the previous ECM 
  • Set transmission compensation code (step 1)*2
  • Perform road test to allow ECM to learn

*1: Read the transmission compensation code from the previous ECM, then transfer it to the new ECM.

*2: Set the transmission compensation code of the current automatic transmission.

HINT: 

When the cable is disconnected/reconnected to the battery terminal, systems temporarily stop operating. However, each system has a function that completes learning the first time the system is used.