Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM100000001D0XG
Model Year Start: 2019 Model: Corolla Hatchback Prod Date Range: [06/2018 -           ]
Title: K120 / K121 (CVT): K120 CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: P074512; Pressure Control Solenoid "A" Circuit Short to Battery; 2019 - 2025 MY Corolla Corolla Hatchback [06/2018 -        ]

DTC

P074512

Pressure Control Solenoid "A" Circuit Short to Battery

DESCRIPTION

Using current from the TCM, the shift solenoid valve SL1 controls the C1 clutch pressure in accordance with the requested shift mode.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

Note

P074512

Pressure Control Solenoid "A" Circuit Short to Battery

A short to +B is detected in the shift solenoid valve SL1 circuit for 1 second or more (1-trip detection logic).

  • Transmission valve body assembly (Shift solenoid valve SL1)
  • Transmission wire
  • Harness and connector
  • TCM

Comes on

DTC stored

SAE Code:

P0963

MONITOR DESCRIPTION

This DTC indicates a short to +B in the shift solenoid valve SL1 circuit. If there is a short to +B in the shift solenoid valve SL1 circuit, the TCM detects the malfunction, illuminates the MIL and stores this DTC.

MONITOR STRATEGY

Related DTCs

P0963: Pressure control solenoid "A" (Shift solenoid valve SL1)/Range check (High current)

Required sensors/Components

Shift solenoid valve SL1

Frequency of operation

Continuous

Duration

1 sec.

MIL operation

Immediate

Sequence of operation

None

TYPICAL ENABLING CONDITIONS

All

The monitor will run whenever the following DTCs are not stored

None

Solenoid current cut status

Not cut

Engine switch

On (IG)

Starter

OFF

Condition (A)

Battery voltage

8 V or more and 11.499 V or less

Target current (0.1 sec. or more)

0.9 A or less

Condition (B)

Battery voltage

11.5 V or more and 16 V or less

Target current (0 sec. or more)

1 A or less

TYPICAL MALFUNCTION THRESHOLDS

Any of the following conditions are met: Condition (A) or (B)

Condition (A)

Battery voltage

8 V or more and 11.499 V or less

Solenoid current

More than 1.145 A

Condition (B)

Battery voltage

11.5 V or more and 16 V or less

Solenoid current

More than 1.22 A

COMPONENT OPERATING RANGE

Both of the following conditions are met: Condition (A) and (B)

Condition (A)

Battery voltage

8 V or more and 11.499 V or less

Solenoid current

1.145 A or less

Condition (B)

Battery voltage

11.5 V or more and 16 V or less

Solenoid current

1.22 A or less

CONFIRMATION DRIVING PATTERN

CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.

HINT:

  • After repairs have been completed, clear the DTCs and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.
  • When clearing the permanent DTCs, refer to the Clear Permanent DTC procedure.

    Click here 2019 - 2022 MY Corolla Corolla Hatchback [06/2018 - 09/2022]; K120 / K121 (CVT): K120 CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: DTC CHECK / CLEAR 2023 MY Corolla Corolla Hatchback [09/2022 - 11/2022]; K120 / K121 (CVT): K120 CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: DTC CHECK / CLEAR 2023 - 2025 MY Corolla Corolla Hatchback [11/2022 -        ]; K120 / K121 (CVT): K120 CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: DTC CHECK / CLEAR

  1. Connect the Techstream to the DLC3.
  2. Turn the engine switch on (IG) and turn the Techstream on.
  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  4. Turn the engine switch off and wait for 2 minutes or more.
  5. Turn the engine switch on (IG) and turn the Techstream on.
  6. Start the engine.
  7. Perform the D Position Shift Test inspection in Road Test. [*1]

    Click here 2019 MY Corolla Corolla Hatchback [06/2018 - 01/2019]; K120 / K121 (CVT): K120 CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: ROAD TEST 2020 - 2022 MY Corolla Corolla Hatchback [01/2019 - 09/2022]; K120 / K121 (CVT): K120 CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: ROAD TEST 2023 - 2025 MY Corolla Corolla Hatchback [09/2022 -        ]; K120 / K121 (CVT): K120 CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: ROAD TEST

    HINT:

    [*1]: Normal judgment procedure.

    The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.

  8. Stop the vehicle.
  9. Enter the following menus: Powertrain / Transmission / Utility / All Readiness.
  10. Input the DTC: P074512.
  11. Check the DTC judgment result.

    Techstream Display

    Description

    NORMAL

    • DTC judgment completed
    • System normal

    ABNORMAL

    • DTC judgment completed
    • System abnormal

    INCOMPLETE

    • DTC judgment not completed
    • Perform driving pattern after confirming DTC enabling conditions

    N/A

    • Unable to perform DTC judgment
    • Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    HINT:

    • If the judgment result shows NORMAL, the system is normal.
    • If the judgment result shows ABNORMAL, the system has a malfunction.
    • If the judgment result shows INCOMPLETE or N/A, perform the normal judgment procedure again.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • Perform the universal trip to clear permanent DTCs.

    Click here 2019 - 2022 MY Corolla Corolla Hatchback [06/2018 - 09/2022]; K120 / K121 (CVT): K120 CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: DTC CHECK / CLEAR 2023 MY Corolla Corolla Hatchback [09/2022 - 11/2022]; K120 / K121 (CVT): K120 CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: DTC CHECK / CLEAR 2023 - 2025 MY Corolla Corolla Hatchback [11/2022 -        ]; K120 / K121 (CVT): K120 CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: DTC CHECK / CLEAR

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

    Click here 2019 MY Corolla Corolla Hatchback [06/2018 - 01/2019]; K120 / K121 (CVT): K120 CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: PRECAUTION 2020 - 2022 MY Corolla Corolla Hatchback [01/2019 - 09/2022]; K120 / K121 (CVT): K120 CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: PRECAUTION 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

  • Check that no DTCs are stored after performing initialization.

    Click here 2019 - 2022 MY Corolla Corolla Hatchback [06/2018 - 09/2022]; K120 / K121 (CVT): K120 CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: DTC CHECK / CLEAR 2023 MY Corolla Corolla Hatchback [09/2022 - 11/2022]; K120 / K121 (CVT): K120 CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: DTC CHECK / CLEAR 2023 - 2025 MY Corolla Corolla Hatchback [11/2022 -        ]; K120 / K121 (CVT): K120 CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: DTC CHECK / CLEAR

PROCEDURE

1.

INSPECT TRANSMISSION WIRE (SHIFT SOLENOID VALVE SL1)

(a) Disconnect the C61 transmission wire connector.

*a

Component without harness connected

(Transmission Wire)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

2 (SL1+) - Other terminals

Always

10 kΩ or higher

7 (SL1-) - Other terminals

Always

10 kΩ or higher

(c) Connect the C61 transmission wire connector.

NG

GO TO STEP 4

OK

2.

CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - TCM)

(a) Disconnect the C80 TCM connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

C80-38 (SL1+) - Other terminals

Always

10 kΩ or higher

C80-37 (SL1-) - Other terminals

Always

10 kΩ or higher

(c) Connect the C80 TCM connector.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (TRANSMISSION WIRE - TCM)

OK

3.

REPLACE TCM

(a) Replace the TCM.

Click here 2019 MY Corolla Corolla Hatchback [06/2018 - 01/2019]; K120 / K121 (CVT): K120 TCM: COMPONENTS 2020 MY Corolla Corolla Hatchback [01/2019 - 03/2019]; K120 / K121 (CVT): K120 TCM: COMPONENTS 2020 - 2025 MY Corolla Corolla Hatchback [03/2019 -        ]; K120 / K121 (CVT): K120 TCM: COMPONENTS

NEXT

PERFORM REGISTRATION AND INITIALIZATION

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

for Initialization: Click here 2019 - 2022 MY Corolla Corolla Hatchback [06/2018 - 09/2022]; K120 / K121 (CVT): K120 CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: 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

4.

INSPECT TRANSMISSION WIRE

(a) Disconnect the C61 transmission wire connector.

*1

Transmission Valve Body Assembly

*2

Shift Solenoid Valve SL1

*3

Transmission Wire

-

-

*a

Shift Solenoid Valve Side

*b

Wire Harness Connector Side

(b) Disconnect the transmission wire connector from the shift solenoid valve SL1.

Click here 2019 - 2022 MY Corolla Corolla Hatchback [06/2018 - 09/2022]; K120 / K121 (CVT): K120 VALVE BODY ASSEMBLY: REMOVAL 2023 MY Corolla Corolla Hatchback [09/2022 - 11/2022]; K120 / K121 (CVT): K120 VALVE BODY ASSEMBLY: REMOVAL 2023 - 2025 MY Corolla Corolla Hatchback [11/2022 -        ]; K120 / K121 (CVT): K120 VALVE BODY ASSEMBLY: REMOVAL

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

1 (shift solenoid valve side) or 2 (SL1+) (wire harness connector side) - All other terminals

Always

10 kΩ or higher

2 (shift solenoid valve side) or 7 (SL1-) (wire harness connector side) - All other terminals

Always

10 kΩ or higher

NG

REPLACE TRANSMISSION WIRE 2019 - 2023 MY Corolla Corolla Hatchback [06/2018 - 03/2023]; K120 / K121 (CVT): TRANSMISSION WIRE: COMPONENTS 2023 - 2025 MY Corolla Corolla Hatchback [03/2023 -        ]; K120 / K121 (CVT): TRANSMISSION WIRE: COMPONENTS

OK

5.

REPLACE TRANSMISSION VALVE BODY ASSEMBLY

(a) Replace the transmission valve body assembly.

Click here 2019 - 2025 MY Corolla Corolla Hatchback [06/2018 -        ]; K120 / K121 (CVT): K120 VALVE BODY ASSEMBLY: COMPONENTS

NEXT

PERFORM REGISTRATION AND INITIALIZATION

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

for Initialization: Click here 2019 - 2022 MY Corolla Corolla Hatchback [06/2018 - 09/2022]; K120 / K121 (CVT): K120 CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: 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