Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM1000000028FKE
Model Year Start: 2023 Model: Corolla Hatchback Prod Date Range: [11/2022 -           ]
Title: K120 / K121 (CVT): K120 CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: HOW TO PROCEED WITH TROUBLESHOOTING; 2023 - 2025 MY Corolla Corolla Hatchback [11/2022 -        ]

HOW TO PROCEED WITH TROUBLESHOOTING

CAUTION / NOTICE / HINT

HINT:

  • Use the following procedure to troubleshoot the continuously variable transaxle system.
  • *: Use the Techstream.

PROCEDURE

1.

VEHICLE BROUGHT TO WORKSHOP
NEXT

2.

CUSTOMER PROBLEM ANALYSIS

(a) Refer to How to Troubleshoot ECU Controlled Systems in Introduction.

Click here 2019 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 -        ]; INTRODUCTION: HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS: HOW TO PROCEED WITH TROUBLESHOOTING

NEXT

3.

INSPECT BATTERY VOLTAGE

(a) Measure the battery voltage.

Standard Voltage:

11 to 14 V

HINT:

If the voltage is below 11 V, recharge or replace the battery before proceeding to the next step.

NEXT

4.

CHECK CAN COMMUNICATION SYSTEM*

(a) Using the Techstream, check if the CAN communication system is functioning normally.

CAN Bus Check

OK:

CAN communication system is functioning normally.

HINT:

  • Refer to CAN Bus Check in CAN Communication System.

    Click here 2023 MY Corolla Corolla Hatchback GR Corolla [11/2022 - 03/2023]; NETWORKING: CAN COMMUNICATION SYSTEM (for Gasoline Model): DIAGNOSIS SYSTEM 2023 MY Corolla Corolla Hatchback GR Corolla [03/2023 - 08/2023]; NETWORKING: CAN COMMUNICATION SYSTEM (for Gasoline Model): DIAGNOSIS SYSTEM 2024 - 2025 MY Corolla Corolla Hatchback GR Corolla [08/2023 -        ]; NETWORKING: CAN COMMUNICATION SYSTEM (for Gasoline Model): DIAGNOSIS SYSTEM

  • The TCM is connected to the CAN communication system. Therefore, before starting troubleshooting, make sure to check that there are no malfunctions in the CAN communications system.
NG

GO TO CAN COMMUNICATION SYSTEM 2023 MY Corolla Corolla Hatchback GR Corolla [11/2022 - 08/2023]; NETWORKING: CAN COMMUNICATION SYSTEM (for Gasoline Model): HOW TO PROCEED WITH TROUBLESHOOTING 2024 - 2025 MY Corolla Corolla Hatchback GR Corolla [08/2023 -        ]; NETWORKING: CAN COMMUNICATION SYSTEM (for Gasoline Model): HOW TO PROCEED WITH TROUBLESHOOTING

OK

5.

CHECK AND CLEAR DTCS AND FREEZE FRAME DATA*

(a) Refer to DTC Check/Clear.

Click here 2023 - 2025 MY Corolla Corolla Hatchback [11/2022 -        ]; K120 / K121 (CVT): K120 CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: DTC CHECK / CLEAR

NEXT

6.

SELECT CHECK MODE DIAGNOSIS*

(a) Refer to Check Mode Procedure.

Click here 2019 - 2025 MY Corolla Corolla Hatchback [06/2018 -        ]; K120 / K121 (CVT): K120 CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: CHECK MODE PROCEDURE

NEXT

7.

CHECK FOR DTC*

(a) Proceed to DTC Check/Clear.

Click here 2023 - 2025 MY Corolla Corolla Hatchback [11/2022 -        ]; K120 / K121 (CVT): K120 CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: DTC CHECK / CLEAR

Powertrain > Transmission > Trouble Codes

Result

Proceed to

DTCs are not output.

A

DTCs are output.

B
B

GO TO STEP 14

A

8.

BASIC INSPECTION

(a) Refer to Continuously Variable Transaxle Fluid.

Click here 2019 - 2023 MY Corolla Corolla Hatchback [06/2018 - 03/2023]; K120 / K121 (CVT): CONTINUOUSLY VARIABLE TRANSAXLE FLUID: ADJUSTMENT 2023 - 2025 MY Corolla Corolla Hatchback [03/2023 -        ]; K120 / K121 (CVT): CONTINUOUSLY VARIABLE TRANSAXLE FLUID: ADJUSTMENT

(b) Refer to Park/Neutral Position Switch.

Click here 2019 - 2025 MY Corolla Corolla Hatchback [06/2018 -        ]; K120 / K121 (CVT): K120 PARK / NEUTRAL POSITION SWITCH: ON-VEHICLE INSPECTION

(c) Refer to Shift Lever.

Click here 2020 - 2023 MY Corolla Corolla Hatchback [01/2019 - 03/2023]; K120 / K121 (CVT): SHIFT LEVER: ON-VEHICLE INSPECTION 2023 - 2025 MY Corolla Corolla Hatchback [03/2023 -        ]; K120 / K121 (CVT): SHIFT LEVER: ON-VEHICLE INSPECTION

NG

GO TO STEP 11

OK

9.

PROBLEM SYMPTOMS CONFIRMATION

(a) Refer to Road Test.

Click here 2023 - 2025 MY Corolla Corolla Hatchback [09/2022 -        ]; K120 / K121 (CVT): K120 CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: ROAD TEST

(b) Refer to Mechanical System Tests.

Click here 2023 - 2025 MY Corolla Corolla Hatchback [09/2022 -        ]; K120 / K121 (CVT): K120 CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: MECHANICAL SYSTEM TESTS

(c) Refer to Hydraulic Test.

Click here 2023 - 2025 MY Corolla Corolla Hatchback [09/2022 -        ]; K120 / K121 (CVT): K120 CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: HYDRAULIC TEST

Result

Proceed to

Symptom does not occur

A

Symptom occurs

B
B

GO TO STEP 11

A

10.

SYMPTOM SIMULATION

(a) Refer to Symptom Simulation.

Click here 2019 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 -        ]; INTRODUCTION: HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS: HOW TO PROCEED WITH TROUBLESHOOTING

NEXT

11.

COMPONENT INSPECTION
NEXT

12.

REPAIR OR REPLACE
NEXT

13.

CONFIRMATION TEST
NEXT

END

14.

DIAGNOSTIC TROUBLE CODE CHART

(a) Proceed to Diagnostic Trouble Code Chart.

Click here 2023 - 2025 MY Corolla Corolla Hatchback [11/2022 -        ]; K120 / K121 (CVT): K120 CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: DIAGNOSTIC TROUBLE CODE CHART

NEXT

15.

CIRCUIT INSPECTION
NEXT

16.

IDENTIFICATION OF PROBLEM
NEXT

17.

REPAIR OR REPLACE
NEXT

18.

CONFIRMATION TEST
NEXT

END