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Home >> Lexus >> 2021 >> UX 200 Base >> Repair and Diagnosis (Single Page) >> Transmission >> Automatic Trans >> Continuously Variable Transaxle (CVT) System (K120) (Diagnostic Codes) (1 Of 2) >> Continuously Variable Transaxle System >> DTC P0840-15: Transmission Fluid Pressure Sensor/Switch "A" Circuit Short To Battery or Open [10/2018 - 07/2022] >> Procedure

DTC P0840-15: Transmission Fluid Pressure Sensor/Switch "A" Circuit Short To Battery or Open [10/2018 - 07/2022]: Procedure

  1. READ VALUE USING TECHSTREAM (BELT CLAMPING FORCE SENSOR) 
    WARNING:

    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.

    NOTE:
    • 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.
    1. Warm up the engine.
    2. 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 has been pushed to the lock side, the maximum amount of braking force is applied if the electric parking brake switch is pushed to the lock side one more time.

    3. Connect the Techstream to the DLC3.
    4. Turn the engine switch on (IG).
    5. Turn the Techstream on.
    6. Enter the following menus: Powertrain / Transmission / Active Test / Activate the TC Terminal.
    7. 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) 
      1. Engine switch on (IG), engine stopped and shift lever in P
    8. Enter the following menus: Powertrain / Transmission / Data List / Belt Clamping Force Sensor.
    9. 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

      Result Proceed to
      Data List value is normal A
      Data List value is not normal B

    Result: 

    B 

    See step  3

    Result: 

    A 

    See step  2

  2. REPLACE TCM 
    1. Replace the TCM.

      Refer to COMPONENTS [10/2018 - 07/2022]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    PERFORM REGISTRATION AND INITIALIZATION 

    for Registration: Refer to REGISTRATION [10/2018 - 07/2022]

    for Initialization: Refer to INITIALIZATION [10/2018 - 07/2022]

  3. CHECK TCM (VCPT TERMINAL VOLTAGE) 
    1. Disconnect the C31 oil pressure sensor connector.
      GTY823646Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Oil Pressure Sensor)
    2. Turn the engine switch on (IG).
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      C31-3 (VC) - C31-1 (E2) Engine switch on (IG) 4.75 to 5.25 V
    4. Connect the C31 oil pressure sensor connector.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  10

    Result: 

    OK 

    See step  4

  4. CHECK HARNESS AND CONNECTOR (OIL PRESSURE SENSOR - TCM) 
    1. Disconnect the C31 oil pressure sensor connector.
    2. Disconnect the C36 TCM connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      C31-2 (PTO) or C36-50 (PTO) - Other terminals Always 10 kΩ or higher
    4. Connect the C36 TCM connector.
    5. Connect the C31 oil pressure sensor connector.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

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

    Result: 

    OK 

    See step  5

  5. REPLACE OIL PRESSURE SENSOR 
    1. Replace the oil pressure sensor.

      Refer to COMPONENTS [10/2018 - 07/2022]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  6

  6. CLEAR DTC 
    1. Clear the DTCs.

      Powertrain > Transmission > Clear DTCs 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  7

  7. PERFORM INITIALIZATION 
    1. Perform Initialization.

      Refer to INITIALIZATION [10/2018 - 07/2022]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  8

  8. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED (P084015) 
    1. Connect the Techstream to the DLC3.
    2. Start the engine and wait for 5 seconds or more.
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / Transmission / Trouble Codes.
    5. Read the DTCs.

      Powertrain > Transmission > Trouble Codes 

      Result

      Result Proceed to
      DTCs are not output A
      DTC P084015 is output B

    Result: 

    A 

    END 

    Result: 

    B 

    See step  9

  9. REPLACE TCM 
    1. Replace the TCM.

      Refer to COMPONENTS [10/2018 - 07/2022]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    PERFORM REGISTRATION AND INITIALIZATION 

    for Registration: Refer to REGISTRATION [10/2018 - 07/2022]

    for Initialization: Refer to INITIALIZATION [10/2018 - 07/2022]

  10. CHECK HARNESS AND CONNECTOR (OIL PRESSURE SENSOR - TCM) 
    1. Disconnect the C31 oil pressure sensor connector.
    2. Disconnect the C36 TCM connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      C31-3 (VC) or C36-49 (VCPT) - Other terminals Always 10 kΩ or higher
    4. Connect the C36 TCM connector.
    5. Connect the C31 oil pressure sensor connector.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

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

    Result: 

    OK 

    See step  11

  11. REPLACE TCM 
    1. Replace the TCM.

      Refer to COMPONENTS [10/2018 - 07/2022]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    PERFORM REGISTRATION AND INITIALIZATION 

    for Registration: Refer to REGISTRATION [10/2018 - 07/2022]

    for Initialization: Refer to INITIALIZATION [10/2018 - 07/2022]

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