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 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

  • 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

  • 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. If there is an open or short in the oil pressure sensor circuit, the ECM detects the problem and stores a DTC.

WIRING DIAGRAM

A01QTR7E06
*a Oil Pressure Sensor

CAUTION / NOTICE / HINT

Note


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

    Click here

  • Check that no DTCs are stored after performing initialization.

    Click here

PROCEDURE


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

    CAUTION:

    The 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 conducted after checking and confirming that the engine is operating normally.

    • Perform this test while the CVT fluid temperature is between 50 and 100°C (122 and 212°F).

    • Perform this test with the A/C off.

    • Do not perform the stall speed test for longer than 5 seconds.


    1. Warm up the engine.

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

    3. Connect the GTS to the DLC3.

    4. Turn the ignition switch to ON.

    5. Turn the GTS on.

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


      Powertrain > Engine and ECT > Active Test
      Tester Display
      Connect the TC and TE1

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

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


      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:


      • 3.5 to 4.5 MPa (35.7 to 45.9 kgf/cm2, 508 to 653 psi): D position stall speed test

      • 2.5 to 4.5 MPa (25.5 to 45.9 kgf/cm2, 363 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 assembly with motor is operating)

      		 -

      Powertrain > Engine and ECT > Data List
      Tester Display
      A/T Oil Pressure
      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 B32 oil pressure sensor connector.

    2. Disconnect the B93 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) - B93-109 (EPTO) Always Below 1 Ω
      B32-2 (PTO) - B93-79 (PTO) Always Below 1 Ω
      B32-3 (VC) - B93-110 (VCPT) Always Below 1 Ω
      B32-1 (E2) or B93-109 (EPTO) - Body ground and other terminals Always 10 kΩ or higher
      B32-2 (PTO) or B93-79 (PTO) - Body ground and other terminals Always 10 kΩ or higher
      B32-3 (VC) or B93-110 (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 Switch Condition Specified Condition
      B93-79 (PTO) - Body ground Ignition switch ON Below 1 V
      B32-2 (PTO) - Body ground Ignition switch ON Below 1 V
      Result
      Proceed to
      OK
      NG

    NG

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

    OK

  3. CHECK ECM (VCPT TERMINAL VOLTAGE)


    1. A01QPD8C31
      *a

      Front view of wire harness connector

      (to Oil Pressure Sensor)

      Disconnect the oil pressure sensor connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      B32-3 (VC) - B32-1 (E2) Ignition switch ON 4.75 to 5.25 V
      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