CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM, Diagnostic DTC:P0842 and 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.

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 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

Comes on (w/ OBD)

- (w/o OBD)

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 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

Comes on (w/ OBD)

- (w/o OBD)

DTC stored

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

C277073E01

CAUTION / NOTICE / HINT

Note:

  • Perform initialization when parts related to the continuously variable transaxle are replaced.

    Click hereClick here

  • Check that no DTCs are stored after performing initialization.

    Click here

PROCEDURE

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

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

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

      Powertrain > Engine and ECT > Data List

      Tester Display

      A/T Oil Pressure

      Powertrain > Engine and ECT > 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 speed test: 3.2 to 4.5 MPa

      • R position stall speed test: 3.0 to 3.5 MPa

      -

    5. In accordance with the display on the GTS, read the Data List.

      Result

      Proceed to

      Data displayed is not as specified under Normal Condition

      Data displayed is as specified under Normal Condition
    Data displayed is as specified under Normal Condition

    REPLACE ECMClick here

    Data displayed is not as specified under Normal Condition

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

    1. Disconnect the B32 oil pressure sensor connector.

    2. Disconnect the B75 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) - B75-121 (EPTO)

      Always

      Below 1 Ω

      B32-2 (PTO) - B75-89 (PTO)

      Always

      Below 1 Ω

      B32-3 (VC) - B75-120 (VCPT)

      Always

      Below 1 Ω

      B32-1 (E2) or B75-121 (EPTO) - Body ground

      Always

      10 kΩ or higher

      B32-2 (PTO) or B75-89 (PTO) - Body ground

      Always

      10 kΩ or higher

      B32-3 (VC) or B75-120 (VCPT) - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT ECM (VCPT TERMINAL VOLTAGE)

    1. C199166C01

      *a

      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

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE ECMClick here

    OK

  4. REPLACE OIL PRESSURE SENSOR

    1. Replace the oil pressure sensor.

      Click hereClick here

    Result

    Proceed to

    NEXT
    NEXT

    PERFORM INITIALIZATION

    Click hereClick here

  5. REPLACE ECM

    1. Replace the ECM.

      Click here

    Result

    Proceed to

    NEXT
    NEXT

    PERFORM INITIALIZATION

    Click hereClick here