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 output by the oil pressure sensor.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P0841 Transmission Fluid Pressure Sensor "A" Performance

1. Diagnosis Condition 2. Malfunction Status 3. Malfunction Time 4. Other

DTC Detection Condition 1:


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

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

  3. 2 seconds

  4. 1-trip detection logic

DTC Detection Condition 2:


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

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

  3. 3 seconds

  4. 1-trip detection logic

  • Oil pressure sensor

  • ECM

 Comes on DTC stored
P2829 Pressure Control Solenoid "K" Performance (Shift Solenoid Valve SLS)

1. Diagnosis Condition 2. Malfunction Status 3. Malfunction Time 4. Other

DTC Detection Condition 1:


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

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

  3. 3 seconds

  4. 1-trip detection logic

DTC Detection Condition 2:


  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 a specified value.

  3. 0.2 seconds

  4. 1-trip detection logic

DTC Detection Condition 3:


  1. The oil pressure sensor output value is below 0.283 MPa (2.9 kgf/cm2, 41 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

  • Continuously variable transaxle assembly

  • ECM

 Comes on DTC stored

MONITOR DESCRIPTION

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

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. CHECK 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.


      Powertrain > Engine and ECT > Trouble Codes

    5. Read the DTCs using the GTS.

      Tech Tips

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

      Result
      Result Proceed to
      Both DTC P0841 and P2829 are output A
      Only DTC P0841 is output B
      Only DTC P2829 is output C
      P0841 and/or P2829 and other DTCs are output D

    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 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:


      • 3.1 to 4.5 MPa (31.6 to 45.9 kgf/cm2, 450 to 653 psi): D position stall speed test

      • 2.1 to 4.5 MPa (21.4 to 45.9 kgf/cm2, 305 to 653 psi): R position stall speed test

      		 -

      Powertrain > Engine and ECT > Data List
      Tester Display
      A/T Oil Pressure
      Result
      Result Proceed to
      Data display is within Normal Condition range A
      Data display is not within Normal Condition range B

    B

    REPLACE OIL PRESSURE SENSOR Click here

    A

  3. REPLACE ECM


    1. Replace the ECM.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    PERFORM INITIALIZATION Click here

  4. REPLACE OIL PRESSURE SENSOR


    1. Replace the oil pressure sensor.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  5. CLEAR DTC


    1. Clear the DTCs.

      Click here


      Powertrain > Engine and ECT > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  6. PERFORM INITIALIZATION

    Note


    • Performing Reset Memory will clear the learned value of the yaw rate and acceleration sensor (deceleration sensor zero point calibration) and the CVT oil pressure (CVT oil pressure calibration). Make sure to perform Reset Memory, yaw rate and acceleration 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

      • Oil pressure sensor

      • Yaw rate and acceleration sensor (Airbag sensor assembly)

    • After performing Reset Memory, always perform yaw rate and acceleration sensor (deceleration sensor zero point) calibration first, and then CVT oil pressure calibration.

    • Always perform calibration with the vehicle on level ground (Inclination: 0 +/- 0.25°).

    • Do not shake or vibrate the vehicle during calibration.


    1. Using the GTS, perform Reset Memory, deceleration sensor zero point calibration and CVT oil pressure calibration.

      Click here

    2. Check for DTCs again.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  7. 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.


      Powertrain > Engine and ECT > Trouble Codes

    6. Read the DTCs using the GTS.

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

    B

    END

    A

  8. REPLACE ECM


    1. Replace the ECM.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  9. PERFORM INITIALIZATION

    Note


    • Performing Reset Memory will clear the learned value of the yaw rate and acceleration sensor (deceleration sensor zero point calibration) and the CVT oil pressure (CVT oil pressure calibration). Make sure to perform Reset Memory, yaw rate and acceleration 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

      • Oil pressure sensor

      • Yaw rate and acceleration sensor (Airbag sensor assembly)

    • After performing Reset Memory, always perform yaw rate and acceleration sensor (deceleration sensor zero point) calibration first, and then CVT oil pressure calibration.

    • Always perform calibration with the vehicle on level ground (Inclination: 0 +/- 0.25°).

    • Do not shake or vibrate the vehicle during calibration.


    1. Using the GTS, perform Reset Memory, deceleration sensor zero point calibration and CVT oil pressure calibration.

      Click here

    2. Check for DTCs again.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  10. 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.


      Powertrain > Engine and ECT > Trouble Codes

    6. Read the DTCs using the GTS.

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

    B

    END

    A

  11. REPLACE CONTINUOUSLY VARIABLE TRANSAXLE ASSEMBLY


    1. Replace the continuously variable transaxle assembly.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    PERFORM INITIALIZATION Click here

  12. 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:


      • 3.1 to 4.5 MPa (31.6 to 45.9 kgf/cm2, 450 to 653 psi): D position stall speed test

      • 2.1 to 4.5 MPa (21.4 to 45.9 kgf/cm2, 305 to 653 psi): R position stall speed test

      		 -

      Powertrain > Engine and ECT > Data List
      Tester Display
      A/T Oil Pressure
      Result
      Result Proceed to
      Data display is within Normal Condition range A
      Data display is not within Normal Condition range B

    B

    REPLACE OIL PRESSURE SENSOR Click here

    A

  13. REPLACE ECM


    1. Replace the ECM.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    PERFORM INITIALIZATION Click here

  14. REPLACE OIL PRESSURE SENSOR


    1. Replace the oil pressure sensor.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  15. CLEAR DTC


    1. Clear the DTCs.

      Click here


      Powertrain > Engine and ECT > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  16. PERFORM INITIALIZATION

    Note


    • Performing Reset Memory will clear the learned value of the yaw rate and acceleration sensor (deceleration sensor zero point calibration) and the CVT oil pressure (CVT oil pressure calibration). Make sure to perform Reset Memory, yaw rate and acceleration 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

      • Oil pressure sensor

      • Yaw rate and acceleration sensor (Airbag sensor assembly)

    • After performing Reset Memory, always perform yaw rate and acceleration sensor (deceleration sensor zero point) calibration first, and then CVT oil pressure calibration.

    • Always perform calibration with the vehicle on level ground (Inclination: 0 +/- 0.25°).

    • Do not shake or vibrate the vehicle during calibration.


    1. Using the GTS, perform Reset Memory, deceleration sensor zero point calibration and CVT oil pressure calibration.

      Click here

    2. Check for DTCs again.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  17. 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.


      Powertrain > Engine and ECT > Trouble Codes

    6. Read the DTCs using the GTS.

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

    B

    END

    A

  18. REPLACE ECM


    1. Replace the ECM.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    PERFORM INITIALIZATION Click here

  19. 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:


      • 3.1 to 4.5 MPa (31.6 to 45.9 kgf/cm2, 450 to 653 psi): D position stall speed test

      • 2.1 to 4.5 MPa (21.4 to 45.9 kgf/cm2, 305 to 653 psi): R position stall speed test

      		 -

      Powertrain > Engine and ECT > Data List
      Tester Display
      A/T Oil Pressure
      Result
      Result Proceed to
      Data display is within Normal Condition range A
      Data display is not within Normal Condition range B

    B

    REPLACE CONTINUOUSLY VARIABLE TRANSAXLE ASSEMBLY Click here

    A

  20. REPLACE ECM


    1. Replace the ECM.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    PERFORM INITIALIZATION Click here

  21. REPLACE CONTINUOUSLY VARIABLE TRANSAXLE ASSEMBLY


    1. Replace the continuously variable transaxle assembly.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    PERFORM INITIALIZATION Click here