Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM1000000025YP5
Model Year Start: 2023 Model: Corolla Hatchback Prod Date Range: [09/2022 -           ]
Title: K120 / K121 (CVT): K120 CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: Drive Mode Select Switch Circuit; 2023 - 2025 MY Corolla Corolla Hatchback [09/2022 -        ]

Drive Mode Select Switch Circuit

SYSTEM DESCRIPTION

The TCM changes between Normal, Sport and Eco drive mode in accordance with the output of the drive mode select switch (combination switch assembly).

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Perform registration and/or initialization when parts related to the continuously variable transaxle system are replaced.

Click here 2023 MY Corolla Corolla Hatchback [09/2022 - 11/2022]; K120 / K121 (CVT): K120 CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: PRECAUTION 2023 - 2025 MY Corolla Corolla Hatchback [11/2022 -        ]; K120 / K121 (CVT): K120 CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: PRECAUTION

PROCEDURE

1.

READ VALUE USING TECHSTREAM (DRIVE MODE SELECT SWITCH (DMS+) AND DRIVE MODE SELECT SWITCH (DMS-))

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine / Data List.

(e) According to the display on the Techstream, read the Data List.

Powertrain > Engine > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Drive Mode Select Switch (DMS+)

Drive mode select switch (combination switch assembly) status

ON or OFF

  • ON: Drive mode select switch (combination switch assembly) pushed forward
  • OFF: Drive mode select switch (combination switch assembly) in neutral position

-

Drive Mode Select Switch (DMS-)

Drive mode select switch (combination switch assembly) status

ON or OFF

  • ON: Drive mode select switch (combination switch assembly) pulled rearward
  • OFF: Drive mode select switch (combination switch assembly) in neutral position

-

Powertrain > Engine > Data List

Tester Display

Drive Mode Select Switch (DMS+)

Drive Mode Select Switch (DMS-)

Result

Proceed to

Data List value is normal

A

Data List value is not normal

B

B

GO TO STEP 3

A

2.

REPLACE ECM

(a) Replace the ECM.

Click here 2023 MY Corolla Corolla Hatchback [09/2022 - 11/2022]; M20A-FKS (ENGINE CONTROL): ECM: COMPONENTS 2023 - 2025 MY Corolla Corolla Hatchback [11/2022 -        ]; M20A-FKS (ENGINE CONTROL): ECM: COMPONENTS

NEXT

PERFORM INITIALIZATION 2023 MY Corolla Corolla Hatchback [09/2022 - 11/2022]; K120 / K121 (CVT): K120 CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: INITIALIZATION 2023 - 2025 MY Corolla Corolla Hatchback [11/2022 -        ]; K120 / K121 (CVT): K120 CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: INITIALIZATION

3.

INSPECT COMBINATION SWITCH ASSEMBLY (DRIVE MODE SELECT SWITCH)

(a) Remove the combination switch assembly.

Click here 2019 - 2025 MY Corolla Corolla Hatchback [06/2018 -        ]; K120 / K121 (CVT): PATTERN SELECT SWITCH: REMOVAL

*a

Component without harness connected

(Combination Switch Assembly (Drive Mode Select Switch))

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

7 (SEL) - 5 (E)

Drive mode select switch pushed forward

Below 50 Ω

7 (SEL) - 5 (E)

Drive mode select switch in neutral position

10 kΩ or higher

6 (E) - 5 (E)

Drive mode select switch pulled rearward

Below 50 Ω

6 (E) - 5 (E)

Drive mode select switch in neutral position

10 kΩ or higher

(c) Install the combination switch assembly.

Click here 2019 - 2025 MY Corolla Corolla Hatchback [06/2018 -        ]; K120 / K121 (CVT): PATTERN SELECT SWITCH: INSTALLATION

NG

REPLACE COMBINATION SWITCH ASSEMBLY (DRIVE MODE SELECT SWITCH)

OK

4.

CHECK HARNESS AND CONNECTOR (COMBINATION SWITCH ASSEMBLY - BODY GROUND)

(a) Disconnect the I61 combination switch assembly connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

I61-5 (E) - Body ground

Always

Below 1 Ω

(c) Connect the I61 combination switch assembly connector.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (COMBINATION SWITCH ASSEMBLY - BODY GROUND)

OK

5.

CHECK HARNESS AND CONNECTOR (COMBINATION SWITCH ASSEMBLY - ECM)

(a) Disconnect the A47 ECM connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

A47-31 (YZK) - Body ground

Drive mode select switch pushed forward

Below 50 Ω

A47-31 (YZK) - Body ground

Drive mode select switch in neutral position

10 kΩ or higher

A47-41 (DMS-) - Body ground

Drive mode select switch pulled rearward

Below 50 Ω

A47-41 (DMS-) - Body ground

Drive mode select switch in neutral position

10 kΩ or higher

(c) Connect the A47 ECM connector.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (COMBINATION SWITCH ASSEMBLY - ECM)

OK

6.

REPLACE ECM

(a) Replace the ECM.

Click here 2023 MY Corolla Corolla Hatchback [09/2022 - 11/2022]; M20A-FKS (ENGINE CONTROL): ECM: COMPONENTS 2023 - 2025 MY Corolla Corolla Hatchback [11/2022 -        ]; M20A-FKS (ENGINE CONTROL): ECM: COMPONENTS

NEXT

PERFORM INITIALIZATION 2023 MY Corolla Corolla Hatchback [09/2022 - 11/2022]; K120 / K121 (CVT): K120 CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: INITIALIZATION 2023 - 2025 MY Corolla Corolla Hatchback [11/2022 -        ]; K120 / K121 (CVT): K120 CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: INITIALIZATION