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

  • Short in oil pressure sensor circuit

  • 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

  • Open in oil pressure sensor circuit

  • 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

A005LSPE01

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 (D position stall test)

      4.4 to 6.4 MPa

      		 -
      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 B45 oil pressure sensor connector.

    2. Disconnect the B22 (for LHD) or B23 (for RHD) ECM connector.

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

      Standard Resistance (Check for Open) (for LHD)
      Tester Connection Condition Specified Condition
      B45-1 (E2) - B22-121 (EPTO) Always Below 1 Ω
      B45-2 (PSP) - B22-89 (PTO) Always Below 1 Ω
      B45-3 (VC) - B22-120 (VCPT) Always Below 1 Ω
      Standard Resistance (Check for Open) (for RHD)
      Tester Connection Condition Specified Condition
      B45-1 (E2) - B23-121 (EPTO) Always Below 1 Ω
      B45-2 (PSP) - B23-89 (PTO) Always Below 1 Ω
      B45-3 (VC) - B23-120 (VCPT) Always Below 1 Ω
      Standard Resistance (Check for Short) (for LHD)
      Tester Connection Condition Specified Condition
      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 (Check for Short) (for RHD)
      Tester Connection Condition Specified Condition
      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. INSPECT ECM (VCPT TERMINAL VOLTAGE)


    1. A005I0DE01
      Text in Illustration
      *a

      Front view of wire harness connector:

      (to Oil Pressure Sensor)

      Connect the B22 (for LHD) or B23 (for RHD) 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 4.5 to 5.5 V

    NG

    REPLACE ECM Click here

    OK

  4. REPLACE OIL PRESSURE SENSOR


    1. Replace the oil pressure sensor Click here.


    NEXT

  5. PERFORM INITIALIZATION

    Note


    • Performing reset memory will clear the learned values of both the yaw rate sensor (deceleration sensor 0 point calibration) and CVT oil pressure (CVT oil pressure calibration). Make sure to perform reset memory, yaw rate sensor 0 point calibration and CVT oil pressure calibration when replacing any of the parts shown in the following table:

      Replaced Part

      • Continuously variable transaxle assembly

      • ECM

      • Skid control computer (w/o VSC)

      • Oil pressure sensor

      • Deceleration sensor (w/o VSC)

      • Airbag sensor assembly (Yaw rate sensor) (w/ VSC)

    • After performing reset memory, always perform yaw rate sensor (deceleration sensor 0 point) calibration first, and then CVT oil pressure calibration.

    • Always perform 0 point calibration with the vehicle on level ground.

    • Do not shake or vibrate the vehicle during 0 point calibration.


    1. Using the intelligent tester, perform reset memory, deceleration sensor 0 point calibration and CVT oil pressure calibration Click here.

    2. Check that no DTC is stored.


    NEXT

    END

  6. REPLACE ECM


    1. Replace the ECM Click here.


    NEXT

  7. PERFORM INITIALIZATION

    Note


    • Performing reset memory will clear the learned values of both the yaw rate sensor (deceleration sensor 0 point calibration) and CVT oil pressure (CVT oil pressure calibration). Make sure to perform reset memory, yaw rate sensor 0 point calibration and CVT oil pressure calibration when replacing any of the parts shown in the following table:

      Replaced Part

      • Continuously variable transaxle assembly

      • ECM

      • Skid control computer (w/o VSC)

      • Oil pressure sensor

      • Deceleration sensor (w/o VSC)

      • Airbag sensor assembly (Yaw rate sensor) (w/ VSC)

    • After performing reset memory, always perform yaw rate sensor (deceleration sensor 0 point) calibration first, and then CVT oil pressure calibration.

    • Always perform 0 point calibration with the vehicle on level ground.

    • Do not shake or vibrate the vehicle during 0 point calibration.


    1. Using the intelligent tester, perform reset memory, deceleration sensor 0 point calibration and CVT oil pressure calibration Click here.

    2. Check that no DTC is stored.


    NEXT

    END