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 Code

DTC Detection Condition


  1. Diagnosis Condition

  2. Malfunction Status

  3. Malfunction Time

  4. Other

 Trouble Area
P0842

  1. 2 seconds or more have elapsed after the engine is started.

  2. There is a short circuit in the 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 have elapsed after the engine is started.

  2. There is an open circuit in the 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 circuit in the oil pressure sensor circuit. When there is an open or short circuit in the oil pressure sensor circuit, the ECM detects the problem, illuminates the MIL and stores the DTC.

WIRING DIAGRAM

A0052RME24
*a Oil Pressure Sensor

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 intelligent 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.

      Engine and ECT
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      A/T Oil Pressure

      Secondary oil pressure value/

      min.: -0.625 MPa

      max.: 9.575 MPa

      Secondary oil pressure inspection


      • D position stall speed test: 4.45 to 5.54 MPa

      • R position stall speed test: 4.45 to 5.54 MPa

      		 -
      Result
      Result Proceed to
      Data displayed is not as specified under Normal Condition A
      Data displayed is as specified under Normal Condition B

    B

    REPLACE ECM Click here

    A

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


    1. A005979E03
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Oil Pressure Sensor)
      *2

      Front view of wire harness connector

      (to ECM)

      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
      Tester Connection Condition Specified Condition
      B32-1 (E2) - B39-72 (EPTO) Always Below 1 Ω
      B32-2 (PTO) - B39-73 (PTO) Always Below 1 Ω
      B32-3 (VC) - B39-95 (VCPT) Always Below 1 Ω
      B32-1 (E2) or B39-72 (EPTO) - Body ground Always 10 kΩ or higher
      B32-2 (PTO) or B39-73 (PTO) - Body ground Always 10 kΩ or higher
      B32-3 (VC) or B39-95 (VCPT) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT ECM (VCPT TERMINAL VOLTAGE)


    1. A0053K1E03
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Oil Pressure Sensor)

      Disconnect the oil pressure sensor 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
      B32-1 (E2) - B32-3 (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

    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

      • Oil pressure sensor

      • Yaw rate sensor

    • 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 (Inclination: 0 +/-0.25°).

    • 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

      • Oil pressure sensor

      • Yaw rate sensor

    • 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 (Inclination: 0 +/-0.25°).

    • 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

  8. REPLACE ECM


    1. Replace the ECM Click here.


    NEXT

  9. 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

      • Oil pressure sensor

      • Yaw rate sensor

    • 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 (Inclination: 0 +/-0.25°).

    • 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