Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM100000002B351
Model Year Start: 2023 Model: Corolla Hatchback Prod Date Range: [03/2023 -           ]
Title: K120 / K121 (CVT): K121 CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: REGISTRATION; 2023 - 2025 MY Corolla Corolla Hatchback [03/2023 -        ]

REGISTRATION

CAUTION / NOTICE / HINT

NOTICE:

  • When the continuously variable transaxle assembly is replaced, the transaxle compensation code must be registered to the ECM (Procedure 1).

    After the continuously variable transaxle assembly is installed, the Quick Response (QR) code label will be positioned where the code cannot be read. Therefore, before installing the continuously variable transaxle assembly, record the transaxle compensation code or register it using the GTS.

  • When the ECM is replaced, the existing transaxle compensation code must be registered to the new ECM (Procedure 2).
  • Perform Reset Memory after replacing the continuously variable transaxle parts.

    Click here 2023 - 2025 MY Corolla Corolla Hatchback [03/2023 -        ]; K120 / K121 (CVT): K121 CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: INITIALIZATION

PROCEDURE

1. INPUT TRANSAXLE COMPENSATION CODE INTO ECM (Procedure 1)

NOTICE:

  • Transaxle compensation codes are unique, 60-digit alphanumeric values printed on a QR code label on the transaxle. If an incorrect transaxle compensation code is registered to the ECM, shift shock may occur.
  • Do not start the engine.

(a) Record the transaxle compensation code specified on the QR code label.

*1

QR Code Label

*2

Transaxle Compensation Code

(b) Make sure that the shift lever is in P or N.

(c) Select "Set Compensation Code".

Powertrain > Engine > Utility

Tester Display

A/T Code Registration

(d) Register the transaxle compensation code.

(1) Select "Input".

(2) Manually input the transaxle compensation code. The code is a 60-digit alphanumeric value printed on the QR code label. After inputting the code, select "OK".

(e) Check that the transaxle compensation code displayed on the screen is correct by comparing it with the 60-digit alphanumeric value on the QR code label.

NOTICE:

If an incorrect transaxle compensation code is registered to the ECM, shift shock may occur.

(f) Select "NEXT" to register the transaxle compensation code to the ECM.

NOTICE:

  • If the registration process fails, the transaxle compensation code may be incorrect. Check the transaxle compensation code again.
  • If the attempted transaxle compensation code is correct, a problem with the wire harness or a bad connection with the DLC3 may cause registration failure. Check the wire harness and the DLC3 connection. If no problem is found, the ECM may be malfunctioning. Check the ECM and repeat this operation.

2. TRANSFER TRANSAXLE COMPENSATION CODE (Procedure 2)

NOTICE:

  • Transaxle compensation codes are unique, 60-digit alphanumeric values printed on a QR code label on the transaxle. If an incorrect transaxle compensation code is registered to the ECM, shift shock may occur.
  • Do not start the engine.

HINT:

The following operation is available for use when the ECM that is being replaced can still transmit its registered transaxle compensation code to the GTS.

(a) Read the transaxle compensation code.

(1) Make sure that the shift lever is in P or N.

(2) Select "Read Compensation Code".

Powertrain > Engine > Utility

Tester Display

A/T Code Registration

(3) Select "Save".

(4) Select "Save" or "Overwrite".

(5) Select "Exit".

NOTICE:

Do not use the code printed on the transaxle QR code label even if the transaxle compensation code cannot be read using the GTS. The code printed on an in-service transaxle may not match its current characteristics. Replace the ECM with a new one and perform a road test to allow the ECM to learn the transaxle characteristics.

(6) Turn the ignition switch off.

(b) Replace the ECM.

(c) Register the transaxle compensation code.

(1) Select "Set Compensation Code".

Powertrain > Engine > Utility

Tester Display

A/T Code Registration

(2) Select "Open".

(3) Select "Open" again to proceed.

(4) Select "Exit".