СИСТЕМА БЕССТУПЕНЧАТОЙ ТРАНСМИССИИ, Diagnostic DTC:P0842, P0843

DTC Code DTC Name
P0842 Transmission Fluid Pressure Sensor/Switch "A" Circuit Low
P0843 Transmission Fluid Pressure Sensor/Switch "A" Circuit High

DESCRIPTION

The ECM 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
P0842 Transmission Fluid Pressure Sensor/Switch "A" Circuit Low

1. Diagnosis Condition 2. Malfunction Status 3. Malfunction Time 4. Other


  1. 2 seconds or more after engine start

  2. Short in oil pressure sensor circuit

  3. 0.5 seconds

  4. 1-trip detection logic

  • Wire harness or connector

  • Oil pressure sensor

  • ECM

 Comes on DTC stored
P0843 Transmission Fluid Pressure Sensor/Switch "A" Circuit High

1. Diagnosis Condition 2. Malfunction Status 3. Malfunction Time 4. Other


  1. 2 seconds or more after engine start

  2. Open or short to B+ in oil pressure sensor circuit

  3. 0.5 seconds

  4. 1-trip detection logic

  • Wire harness or connector

  • Oil pressure sensor

  • ECM

 Comes on DTC stored

MONITOR DESCRIPTION

These DTCs indicate an open or short in the oil pressure sensor circuit. If there is an open or short in the oil pressure sensor circuit, the ECM detects the malfunction, illuminates the MIL and stores a DTC.

WIRING DIAGRAM

A01UCW7E03
*a Oil Pressure Sensor

CAUTION / NOTICE / HINT

Note


  • Perform initialization after replacing any parts related to the continuously variable transaxle system.

    Click here

  • Check that no DTCs are stored after performing initialization.

    Click here

Tech Tips

After performing repair, clear the DTCs and perform the following procedure to check that DTCs are not output.


  1. Start the engine and wait for 2 seconds or more.

  2. Check for DTCs again.

    Click here

PROCEDURE


  1. READ VALUE USING GTS (A/T OIL PRESSURE)

    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.

    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 electronic parking brake system off.


    1. Warm up the engine.

    2. Fully apply the parking brake and chock all 4 wheels.

      Tech Tips

      When the electric parking brake switch (combination switch assembly) is pulled to the lock side 2 times (2 lock operations), the maximum amount of braking force is applied.

    3. Connect the GTS to the DLC3.

    4. Turn the engine switch on (IG).

    5. Turn the GTS on.

    6. Enter the following menus: Powertrain / Engine and ECT / Active Test / Connect the TC and TE1.


      Powertrain > Engine > Active Test
      Active Test Display
      Connect the TC and TE1
      Data List Display
      A/T Oil Pressure

    7. Observe "A/T Oil Pressure" in the Data List.

    8. According to the display on the GTS, read the Data List.


      Powertrain > Engine > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      A/T Oil Pressure Secondary oil pressure value

      min.: -64 MPa

      max.: 63.998 MPa

      Secondary oil pressure inspection:


      • 4.2 to 5.5 MPa (42.8 to 56.1 kgf/cm2, 609 to 798 psi): D position stall speed test

      • 3.1 to 4.5 MPa (31.6 to 45.9 kgf/cm2, 449 to 653 psi): R position stall speed test

      • 0.140 to 0.400 MPa (1.4 to 4.1 kgf/cm2, 20 to 58 psi): With shift lever in D, engine is stopped by start and stop system (oil pump with motor assembly is operating)

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

    B

    REPLACE ECM Click here

    A

  2. CHECK HARNESS AND CONNECTOR (OIL PRESSURE SENSOR - ECM)


    1. Disconnect the D29 oil pressure sensor connector.

    2. Disconnect the D1 ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D29-1 (E2) - D1-109 (EPTO) Always Below 1 Ω
      D29-2 (PTO) - D1-79 (PTO) Always Below 1 Ω
      D29-3 (VC) - D1-110 (VCPT) Always Below 1 Ω
      D29-1 (E2) or D1-109 (EPTO) - Body ground and other terminals Always 10 kΩ or higher
      D29-2 (PTO) or D1-79 (PTO) - Body ground and other terminals Always 10 kΩ or higher
      D29-3 (VC) or D1-110 (VCPT) - Body ground and other terminals Always 10 kΩ or higher

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      D1-79 (PTO) - Body ground Engine switch on (IG) Below 1 V
      D29-2 (PTO) - Body ground Engine switch on (IG) Below 1 V

    5. Connect the D1 ECM connector.

    6. Connect the D29 oil pressure sensor connector.

      Result
      Proceed to
      OK
      NG

    NG

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

    OK

  3. CHECK ECM (VCPT TERMINAL VOLTAGE)


    1. A01UECYC30
      *a

      Front view of wire harness connector

      (to Oil Pressure Sensor)

      Disconnect the D29 oil pressure sensor connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      D29-3 (VC) - D29-1 (E2) Engine switch on (IG) 4.75 to 5.25 V

    3. Connect the D29 oil pressure sensor connector.

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE ECM Click here

    OK

  4. REPLACE OIL PRESSURE SENSOR


    1. Replace the oil pressure sensor.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    PERFORM INITIALIZATION Click here

  5. REPLACE ECM


    1. Replace the ECM.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    PERFORM INITIALIZATION Click here

  6. REPLACE ECM


    1. Replace the ECM.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    PERFORM INITIALIZATION Click here