Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM1000000028EL4
Model Year Start: 2023 Model: Corolla Hatchback Prod Date Range: [11/2022 -           ]
Title: K120 / K121 (CVT): K120 CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: P084011; Transmission Fluid Pressure Sensor/Switch "A" Circuit Short To Ground; 2023 - 2025 MY Corolla Corolla Hatchback [11/2022 -        ]

DTC

P084011

Transmission Fluid Pressure Sensor/Switch "A" Circuit Short To Ground

DESCRIPTION

The TCM performs learning control for the belt clamping pressure based on the belt clamping pressure signal, which is output by the oil pressure sensor.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

Note

P084011

Transmission Fluid Pressure Sensor/Switch "A" Circuit Short To Ground

When 2 seconds or more have elapsed since engine start, a short to ground is detected in the oil pressure sensor circuit for 0.5 seconds or more (1-trip detection logic).
  • Wire harness or connector
  • Oil pressure sensor
  • TCM

Comes on

DTC stored

SAE Code:

P0842

MONITOR DESCRIPTION

This DTC indicates a short to ground in the oil pressure sensor circuit. If there is a short to ground in the oil pressure sensor circuit, the TCM detects the malfunction, illuminates the MIL and stores a DTC.

MONITOR STRATEGY

Related DTCs

P0842: Oil pressure sensor/Range check (Low voltage)

Required sensors/Components

Oil pressure sensor

Frequency of operation

Continuous

Duration

0.5 sec.

MIL operation

Immediate

Sequence of operation

None

TYPICAL ENABLING CONDITIONS

Starter

OFF

Lost Communication with ECM/PCM (U0100)

(Pending / MIL)

Not detected

Battery voltage

8 V or more

Engine switch

On (IG)

TYPICAL MALFUNCTION THRESHOLDS

Oil pressure sensor voltage

Less than 0.28 V

COMPONENT OPERATING RANGE

Oil pressure sensor voltage

0.28 V or more and 4.9 V or less

CONFIRMATION DRIVING PATTERN

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 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 and wait for 5 seconds or more. [*1]

    HINT:

    [*1]: Normal judgment procedure.

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

  7. Enter the following menus: Powertrain / Transmission / Utility / All Readiness.
  8. Input the DTC: P084011.
  9. 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

CAUTION:

  • Do not perform a stall test if there are any people or objects near the vehicle.
  • The vehicle could begin moving suddenly, resulting in a serious accident.
  • Do not perform a stall test if any wheel chock is out of position.
  • The vehicle could begin moving suddenly, resulting in a serious accident.
  • Do not perform the stall test on a slippery or low-friction surface that could allow the tires to spin.
  • The vehicle could begin moving suddenly, resulting in a serious accident.

NOTICE:

  • Perform the universal trip to clear permanent DTCs.

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

PROCEDURE

1.

READ VALUE USING TECHSTREAM (BELT CLAMPING FORCE SENSOR)

CAUTION:

A stall speed test should always be performed with at least 2 people. One person should observe the condition of the wheels and wheel chocks while the other is performing the test.

NOTICE:

  • This test must be performed after checking and confirming that the engine is normal.
  • Perform this test with the CVT fluid temperature between 50 and 100°C (122 and 212°F).
  • Perform this test with the air conditioning off.
  • Do not perform the stall speed test for longer than 5 seconds.
  • When performing the stall speed test repeatedly, wait for 15 seconds or more between tests.
  • Perform this test with the AUTO function (shift-linked function) of the electric parking brake system off.

(a) Warm up the engine.

(b) Fully apply the parking brake and chock all 4 wheels.

HINT:

When the parking brake indicator (red) is illuminated after the electric parking brake switch (electric parking brake switch assembly) has been pulled to the lock side, the maximum amount of braking force is applied if the electric parking brake switch (electric parking brake switch assembly) is pulled to the lock side one more time.

(c) Connect the Techstream to the DLC3.

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

(e) Turn the Techstream on.

(f) Enter the following menus: Powertrain / Transmission / Active Test / Activate the TC Terminal.

(g) According to the display on the Techstream, perform the Active Test.

Powertrain > Transmission > Active Test

Tester Display

Measurement Item

Control Range

Diagnostic Note

Activate the TC Terminal

Turn on and off TC and TE1 (CG) connection

ON or OFF
  • ON: TC and TE1 are connected.
  • OFF: TC and TE1 are disconnected.

(Vehicle Condition)

  • Engine switch on (IG), engine stopped and shift lever in P

(h) Enter the following menus: Powertrain / Transmission / Data List / Belt Clamping Force Sensor.

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

Powertrain > Transmission > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Belt Clamping Force Sensor

Secondary oil pressure value

Min.: -64 MPa

Max.: 63.998 MPa

Secondary oil pressure inspection:

  • 3.5 to 4.3 MPa (35.7 to 43.8 kgf/cm2, 508 to 624 psi): D position stall test
  • 1.6 to 2.4 MPa (16.3 to 24.5 kgf/cm2, 232 to 348 psi): R position stall test

-

Powertrain > Transmission > Active Test

Active Test Display

Activate the TC Terminal

Data List Display

Belt Clamping Force Sensor

Result

Proceed to

Data List value is normal

A

Data List value is not normal

B
B

GO TO STEP 3

A

2.

REPLACE TCM

(a) Replace the TCM.

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

3.

CHECK TCM (VCPT TERMINAL VOLTAGE)

(a) Disconnect the C71 oil pressure sensor connector.

*a

Front view of wire harness connector

(to Oil Pressure Sensor)

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

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

C71-3 (VC) - C71-1 (E2)

Engine switch on (IG)

4.75 to 5.25 V

(d) Connect the C71 oil pressure sensor connector.

NG

GO TO STEP 10

OK

4.

CHECK HARNESS AND CONNECTOR (OIL PRESSURE SENSOR - TCM)

(a) Disconnect the C71 oil pressure sensor connector.

(b) Disconnect the C80 TCM connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

C71-2 (PTO) - C80-50 (PTO)

Always

Below 1 Ω

C71-2 (PTO) or C80-50 (PTO) - Body ground and other terminals

Always

10 kΩ or higher

(d) Connect the C80 TCM connector.

(e) Connect the C71 oil pressure sensor connector.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (OIL PRESSURE SENSOR - TCM)
OK

5.

REPLACE OIL PRESSURE SENSOR

(a) Replace the oil pressure sensor.

Click here 2019 - 2025 MY Corolla Corolla Hatchback [06/2018 -        ]; K120 / K121 (CVT): OIL PRESSURE SENSOR: COMPONENTS

NEXT

6.

CLEAR DTC

(a) Clear the DTCs.

Powertrain > Transmission > Clear DTCs

NEXT

7.

PERFORM INITIALIZATION

(a) Perform Initialization.

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

NEXT

8.

CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED (P084011)

(a) Connect the Techstream to the DLC3.

(b) Start the engine and wait for 5 seconds or more.

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Transmission / Trouble Codes.

(e) Read the DTCs.

Powertrain > Transmission > Trouble Codes

Result

Proceed to

DTCs are not output

A

DTC P084011 is output

B
A

END
B

9.

REPLACE TCM

(a) Replace the TCM.

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

10.

CHECK HARNESS AND CONNECTOR (OIL PRESSURE SENSOR - TCM)

(a) Disconnect the C71 oil pressure sensor connector.

(b) Disconnect the C80 TCM connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

C71-3 (VC) - C80-49 (VCPT)

Always

Below 1 Ω

C71-1 (E2) - C80-48 (EPTO)

Always

Below 1 Ω

C71-3 (VC) or C80-49 (VCPT) - Body ground and other terminals

Always

10 kΩ or higher

C71-1 (E2) or C80-48 (EPTO) - Body ground and other terminals

Always

10 kΩ or higher

(d) Connect the C80 TCM connector.

(e) Connect the C71 oil pressure sensor connector.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (OIL PRESSURE SENSOR - TCM)
OK

11.

REPLACE TCM

(a) Replace the TCM.

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