CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM, Diagnostic DTC:P0841, P2829

DTC Code DTC Name
P0841 Transmission Fluid Pressure Sensor "A" Performance
P2829 Pressure Control Solenoid "K" Performance (Shift Solenoid Valve SLS)

DESCRIPTION

The ECM controls the secondary oil pressure calibration based on the secondary oil pressure signal detected by the oil pressure sensor.

DTC No.

DTC Detection Condition


  1. Diagnosis Condition

  2. Malfunction Status

  3. Malfunction Time

  4. Other

 Trouble Area
P0841

  1. The requested oil pressure value is 1.4 MPa (14.3 kgf/cm2, 203 psi) or more.

  2. The oil pressure sensor output value is 0.5 MPa (5.1 kgf/cm2, 73 psi) or less.

  3. 2 seconds

  4. 1 trip detection logic

  • Oil pressure sensor

  • ECM

  1. The requested oil pressure value is 1.0 MPa (10.2 kgf/cm2, 145 psi) or less.

  2. The oil pressure sensor output value is 2.5 MPa (25.5 kgf/cm2, 363 psi) or more.

  3. 3 seconds

  4. 1 trip detection logic
P2829

  1. The requested oil pressure value is 1.0 MPa (10.2 kgf/cm2, 145 psi) or less.

  2. The oil pressure sensor output value is 2.5 MPa (25.5 kgf/cm2, 363 psi) or more.

  3. 3 seconds

  4. 1 trip detection logic

  • Continuously variable transaxle assembly

  • ECM

  1. The shift lever is in D, and the vehicle speed is less than 8 km/h (5 mph).

  2. The ratio of the transmission revolution sensor (NIN) speed and the transmission revolution sensor (NOUT) speed exceeds the specified value.

  3. 0.2 seconds or more

  4. 1 trip detection logic

  1. The oil pressure sensor output value is less than 0.35 MPa (3.6 kgf/cm2, 51 psi) and the target gear ratio is 2.0 or more.

  2. The actual gear ratio is less than 1.0.

  3. 1.5 seconds or more

  4. 1 trip detection logic

MONITOR DESCRIPTION

The ECM checks for belt clamping high-pressure or low-pressure errors. When a mechanical malfunction is detected at the shift solenoid valve SLS and at the oil pressure sensor, the ECM detects the problem, illuminates the MIL and stores the DTC.

PROCEDURE


  1. CHECK OTHER DTC OUTPUT (IN ADDITION TO DTC P0841 AND P2829)


    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
      Both of P0841 and P2829 are output A
      Only P0841 is output B
      Only P2829 is output C
      P0841 and/or P2829 and other DTCs are output D

      Tech Tips

      If any other DTCs besides P0841 or P2829 are output, perform troubleshooting for those DTCs first.


    B

    READ VALUE USING GTS (A/T OIL PRESSURE) Click here

    C

    READ VALUE USING GTS (A/T OIL PRESSURE) Click here

    D

    GO TO DTC CHART Click here

    A

  2. 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 the test with the A/C off.

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


    1. Fully apply the parking brake and chock the 4 wheels.

    2. Connect the GTS to the DLC3.

    3. Turn the ignition switch to ON.

    4. Start the engine.

    5. Turn the GTS on.

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

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

    8. 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 within Normal Condition range A
      Data displayed is not within Normal Condition range B

    B

    REPLACE OIL PRESSURE SENSOR Click here

    A

  3. REPLACE ECM


    1. Replace the ECM 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 OIL PRESSURE SENSOR


    1. Replace the oil pressure sensor Click here.


    NEXT

  6. CLEAR DTC


    1. Clear the DTC Click here.


    NEXT

  7. 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

  8. CHECK DTC OUTPUT


    1. Perform a road test.

    2. Connect the GTS to the DLC3.

    3. Turn the ignition switch to ON.

    4. Turn the GTS on.

    5. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

    6. Read the DTCs using the GTS.

      Result
      Result Proceed to
      P0841 and/or P2829 is output A
      DTC is not output B

    B

    END

    A

  9. REPLACE ECM


    1. Replace the ECM Click here.


    NEXT

  10. 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

  11. CHECK DTC OUTPUT


    1. Perform a road test.

    2. Connect the GTS to the DLC3.

    3. Turn the ignition switch to ON.

    4. Turn the GTS on.

    5. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

    6. Read the DTCs using the GTS.

      Result
      Result Proceed to
      P2829 is output A
      DTC is not output B

    B

    END

    A

  12. REPLACE CONTINUOUSLY VARIABLE TRANSAXLE ASSEMBLY


    1. Replace the continuously variable transaxle assembly Click here.


    NEXT

  13. CLEAR DTC


    1. Clear the DTC Click here.


    NEXT

  14. 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

  15. 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 the test with the A/C off.

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


    1. Fully apply the parking brake and chock the 4 wheels.

    2. Connect the GTS to the DLC3.

    3. Turn the ignition switch to ON.

    4. Start the engine.

    5. Turn the GTS on.

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

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

    8. 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

  16. REPLACE OIL PRESSURE SENSOR


    1. Replace the oil pressure sensor Click here.


    NEXT

  17. CLEAR DTC


    1. Clear the DTC Click here.


    NEXT

  18. 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

  19. CHECK DTC OUTPUT


    1. Perform a road test.

    2. Connect the GTS to the DLC3.

    3. Turn the ignition switch to ON.

    4. Turn the GTS on.

    5. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

    6. Read the DTCs using the GTS.

      Result
      Result Proceed to
      DTC P0841 is output A
      DTC P0841 is not output B

    B

    END

    A

  20. REPLACE ECM


    1. Replace the ECM Click here.


    NEXT

  21. 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

  22. 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 the test with the A/C off.

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


    1. Fully apply the parking brake and chock the 4 wheels.

    2. Connect the GTS to the DLC3.

    3. Turn the ignition switch to ON.

    4. Start the engine.

    5. Turn the GTS on.

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

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

    8. 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 within Normal Condition range A
      Data displayed is not within Normal Condition range B

    B

    REPLACE CONTINUOUSLY VARIABLE TRANSAXLE ASSEMBLY Click here

    A

  23. REPLACE ECM


    1. Replace the ECM Click here.


    NEXT

  24. 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

  25. REPLACE CONTINUOUSLY VARIABLE TRANSAXLE ASSEMBLY


    1. Replace the continuously variable transaxle assembly Click here.


    NEXT

  26. 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