CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM, 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 detected by the oil pressure sensor.

DTC No.

DTC Detection Condition


  1. Diagnosis Condition

  2. Malfunction Status

  3. Malfunction Time

  4. Other

 Trouble Area
P0842

  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
P0843

  1. 2 seconds or more after engine start

  2. Open in oil pressure sensor circuit

  3. 0.5 seconds

  4. 1 trip detection logic

  • Wire harness or connector

  • Oil pressure sensor

  • ECM

MONITOR DESCRIPTION

These DTCs indicate an open or short in the oil pressure sensor. When there is an open or short circuit in oil pressure sensor circuits, the ECM detects the problem and stores the DTC.

WIRING DIAGRAM

A01VDYHE02

PROCEDURE


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


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the tester on.

    4. Enter the following menus: Powertrain / Engine and ECT / Data List.

    5. In accordance with the display on the tester, read the 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


      • 4.4 to 6.4 MPa: D position stall test

      		 -
      Result
      Result Proceed to
      Data display is not within Normal Condition range A
      Data display is within Normal Condition range B

    B

    REPLACE ECM Click here

    A

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


    1. Disconnect the oil pressure sensor connector.

    2. Disconnect the ECM connector.

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

      Standard Resistance (for LHD)
      Tester Connection Condition Specified Condition
      B45-1 (E2) - B22-121 (EPTO) Always Below 1 Ω
      B45-2 (PTO) - B22-89 (PTO) Always Below 1 Ω
      B45-3 (VC) - B22-120 (VCPT) Always Below 1 Ω
      B22-121 (EPTO) - Body ground Always 10 kΩ or higher
      B22-89 (PTO) - Body ground Always 10 kΩ or higher
      B22-120 (VCPT) - Body ground Always 10 kΩ or higher
      Standard Resistance (for RHD)
      Tester Connection Condition Specified Condition
      B45-1 (E2) - B23-121 (EPTO) Always Below 1 Ω
      B45-2 (PTO) - B23-89 (PTO) Always Below 1 Ω
      B45-3 (VC) - B23-120 (VCPT) Always Below 1 Ω
      B23-121 (EPTO) - Body ground Always 10 kΩ or higher
      B23-89 (PTO) - Body ground Always 10 kΩ or higher
      B23-120 (VCPT) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK ECM (VCPT TERMINAL VOLTAGE)


    1. A01VGO9E01
      Text in Illustration
      *a

      Front view of wire harness connector:

      (to Oil Pressure Sensor)

      Connect the ECM connector.

    2. Turn the ignition switch to ON.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      B45-1 (E2) - B45-3 (VC) Ignition switch ON 4.75 to 5.25 V

    NG

    REPLACE ECM Click here

    OK

  4. REPLACE OIL PRESSURE SENSOR


    1. Replace the oil pressure sensor Click here.


    NEXT

  5. PERFORM INITIALIZATION


    1. Perform the initialization Click here.

    2. Check for DTCs again Click here.


    NEXT

    END

  6. REPLACE ECM


    1. Replace the ECM Click here.


    NEXT

  7. PERFORM INITIALIZATION


    1. Perform the initialization Click here.

    2. Check for DTCs again Click here.


    NEXT

    END