CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM, Diagnostic DTC:P0942

DTC Code DTC Name
P0942 Hydraulic Pressure Unit

DESCRIPTION

When the engine automatically stops, the front oil pump of the continuously variable transaxle also stops. For smooth starting of the vehicle, the hydraulic pressure in the continuously variable transaxle is maintained by driving the electric oil pump between the engine automatic stop and the vehicle start.

DTC No.

DTC Detection Condition


  1. Diagnosis Condition

  2. Malfunction Status

  3. Malfunction Time

  4. Other

 Trouble Area
P0942

  1. When the engine automatically starts (when the vehicle starts)

  2. The turbine (NT) rotation speed is higher than the primary pulley rotation speed.

  3. 3 Times

  4. 1 trip detection logic

  • Continuously variable transaxle assembly (Oil pump with motor assembly)

  • Stop and Start System

  • ECM

  1. While the engine automatically stops with the shift lever in D.

  2. The belt clamping pressure is below the standard value.

  3. 10 seconds have passed since the engine automatically stops.

  4. 1 trip detection logic

CAUTION / NOTICE / HINT

Tech Tips

Read freeze frame data using the GTS. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.

PROCEDURE


  1. CHECK DTC OUTPUT (IN ADDITION TO DTC P0942)


    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 / Trouble Codes.

    5. Read the DTCs using the GTS.

      Result
      Result Proceed to
      DTCs for stop and start system are not output A
      DTCs for stop and start system are output B

    B

    GO TO STOP AND START SYSTEM Click here

    A

  2. 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.

    5. In accordance with the display on the GTS, 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.: -64 MPa

      max.: 63.998 MPa

      Secondary oil pressure inspection


      • 0.2 to 2.2 MPa (2 to 22.4 kgf/cm2, 29 to 319 psi): Engine idling (Vehicle stopped with shift lever in N)

      • 4.0 to 4.8 MPa (40.8 to 48.9 kgf/cm2, 580 to 696 psi): D position stall test

      • 0.13 to 0.4 MPa (1.3 to 4.1 kgf/cm2, 18.9 to 58 psi): Engine is in an automatically stopped state

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

    B

    REPLACE ECM Click here

    A

  3. REPLACE OIL PUMP WITH MOTOR ASSEMBLY

    Click here


    NEXT

  4. PERFORM INITIALIZATION

    Note


    • Performing reset memory/initialization will clear the learned value of the deceleration sensor (deceleration sensor zero point calibration) and the CVT oil pressure (CVT oil pressure calibration). Make sure to perform reset memory, deceleration sensor zero 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

      • Brake actuator assembly (Skid control ECU)

      • Oil pressure sensor

      • Deceleration sensor

    • After reset memory, always perform deceleration sensor (deceleration sensor zero point) calibration first, and then the CVT oil pressure calibration.

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

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


    1. Using the GTS, perform the reset memory, deceleration sensor zero point calibration and CVT oil pressure calibration Click here.

    2. Check for DTCs again Click here.


    NEXT

    END

  5. REPLACE ECM


    1. Replace the ECM Click here.


    NEXT

  6. PERFORM INITIALIZATION

    Note


    • Performing reset memory/initialization will clear the learned value of the deceleration sensor (deceleration sensor zero point calibration) and the CVT oil pressure (CVT oil pressure calibration). Make sure to perform reset memory, deceleration sensor zero 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

      • Brake actuator assembly (Skid control ECU)

      • Oil pressure sensor

      • Deceleration sensor

    • After reset memory, always perform deceleration sensor (deceleration sensor zero point) calibration first, and then the CVT oil pressure calibration.

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

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


    1. Using the GTS, perform the reset memory, deceleration sensor zero point calibration and CVT oil pressure calibration Click here.

    2. Check for DTCs again Click here.


    NEXT

    END