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 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 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


    DTC Detection Condition 2:

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

  2. The difference between the calculated primary pulley pressure and target primary pulley pressure is 2.5 MPa (25.5 kgf/cm2, 363 psi) or more.

  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 1.0 MPa (10.2 kgf/cm2, 145 psi) or less.

  2. The difference between the calculated primary pulley pressure and target primary pulley pressure is 2.5 MPa (25.5 kgf/cm2, 363 psi) or more.

  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) output speed and transmission revolution sensor (NOUT) output 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 less than 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 malfunctions. If a mechanical malfunction of the shift solenoid valve SLS or the oil pressure sensor is detected by the ECM, it illuminates the MIL and stores a DTC.

CAUTION / NOTICE / HINT

Note


  • Perform initialization after replacing any parts related to the continuously variable transaxle system.

    Click here

  • Check that no DTCs are stored after performing initialization.

    Click here

Tech Tips

After performing repair, clear the DTCs and perform the following procedure to check that DTCs are not output.


  1. Perform the D position test in Road Test.

    Click here

  2. Check for DTCs again.

    Click here

PROCEDURE


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


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

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


      Powertrain > Engine > Trouble Codes

    5. Read the DTCs using the GTS.

      Tech Tips

      If any DTCs other than 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
      DTC 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:

    A 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 performed after checking and confirming that the engine is normal.

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

    • Perform this test with the air conditioning off.

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

    • When performing the stall speed test repeatedly, wait for 15 seconds or more between tests.

    • Perform this test with the AUTO function (shift-linked function) of the electronic parking brake system off.


    1. Warm up the engine.

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

      Tech Tips

      When the electric parking brake switch (combination switch assembly) is pulled to the lock side 2 times (2 lock operations), the maximum amount of braking force is applied.

    3. Connect the GTS to the DLC3.

    4. Turn the engine switch on (IG).

    5. Turn the GTS on.

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


      Powertrain > Engine > Active Test
      Active Test Display
      Connect the TC and TE1
      Data List Display
      A/T Oil Pressure

    7. Observe "A/T Oil Pressure" in the Data List.

    8. According to the display on the GTS, read the Data List.


      Powertrain > Engine > 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:


      • 4.2 to 5.5 MPa (42.8 to 56.1 kgf/cm2, 609 to 798 psi): D position stall speed test

      • 3.1 to 4.5 MPa (31.6 to 45.9 kgf/cm2, 449 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 with motor assembly is operating)

      		 -
      Result
      Result Proceed to
      Data List value is normal A
      Data List value is not normal 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.


      Powertrain > Engine > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  6. PERFORM INITIALIZATION

    Note


    • Performing Reset Memory will clear the learned values 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, Deceleration Sensor Zero Point Calibration, and CVT Oil Pressure Calibration if any of the parts in the following table have been replaced.

      Replaced Part

      • Continuously variable transaxle assembly

      • ECM

      • Oil pressure sensor

      • Airbag ECU assembly (Yaw rate and acceleration sensor)

    • After performing Reset Memory, always perform 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

      Result
      Proceed to
      NEXT

    NEXT

  7. CHECK DTC OUTPUT


    1. Perform a road test.

    2. Connect the GTS to the DLC3.

    3. Turn the engine switch on (IG).

    4. Turn the GTS on.

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


      Powertrain > Engine > 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 values 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, Deceleration Sensor Zero Point Calibration, and CVT Oil Pressure Calibration if any of the parts in the following table have been replaced.

      Replaced Part

      • Continuously variable transaxle assembly

      • ECM

      • Oil pressure sensor

      • Airbag ECU assembly (Yaw rate and acceleration sensor)

    • After performing Reset Memory, always perform 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

      Result
      Proceed to
      NEXT

    NEXT

  10. CHECK DTC OUTPUT


    1. Perform a road test.

    2. Connect the GTS to the DLC3.

    3. Turn the engine switch on (IG).

    4. Turn the GTS on.

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


      Powertrain > Engine > 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:

    A 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 performed after checking and confirming that the engine is normal.

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

    • Perform this test with the air conditioning off.

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

    • When performing the stall speed test repeatedly, wait for 15 seconds or more between tests.

    • Perform this test with the AUTO function (shift-linked function) of the electronic parking brake system off.


    1. Warm up the engine.

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

      Tech Tips

      When the electric parking brake switch (combination switch assembly) is pulled to the lock side 2 times (2 lock operations), the maximum amount of braking force is applied.

    3. Connect the GTS to the DLC3.

    4. Turn the engine switch on (IG).

    5. Turn the GTS on.

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


      Powertrain > Engine > Active Test
      Active Test Display
      Connect the TC and TE1
      Data List Display
      A/T Oil Pressure

    7. Observe "A/T Oil Pressure" in the Data List.

    8. According to the display on the GTS, read the Data List.


      Powertrain > Engine > 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:


      • 4.2 to 5.5 MPa (42.8 to 56.1 kgf/cm2, 609 to 798 psi): D position stall speed test

      • 3.1 to 4.5 MPa (31.6 to 45.9 kgf/cm2, 449 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 with motor assembly is operating)

      		 -
      Result
      Result Proceed to
      Data List value is normal A
      Data List value is not normal 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.


      Powertrain > Engine > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  16. PERFORM INITIALIZATION

    Note


    • Performing Reset Memory will clear the learned values 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, Deceleration Sensor Zero Point Calibration, and CVT Oil Pressure Calibration if any of the parts in the following table have been replaced.

      Replaced Part

      • Continuously variable transaxle assembly

      • ECM

      • Oil pressure sensor

      • Airbag ECU assembly (Yaw rate and acceleration sensor)

    • After performing Reset Memory, always perform 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

      Result
      Proceed to
      NEXT

    NEXT

  17. CHECK DTC OUTPUT


    1. Perform a road test.

    2. Connect the GTS to the DLC3.

    3. Turn the engine switch on (IG).

    4. Turn the GTS on.

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


      Powertrain > Engine > 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:

    A 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 performed after checking and confirming that the engine is normal.

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

    • Perform this test with the air conditioning off.

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

    • When performing the stall speed test repeatedly, wait for 15 seconds or more between tests.

    • Perform this test with the AUTO function (shift-linked function) of the electronic parking brake system off.


    1. Warm up the engine.

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

      Tech Tips

      When the electric parking brake switch (combination switch assembly) is pulled to the lock side 2 times (2 lock operations), the maximum amount of braking force is applied.

    3. Connect the GTS to the DLC3.

    4. Turn the engine switch on (IG).

    5. Turn the GTS on.

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


      Powertrain > Engine > Active Test
      Active Test Display
      Connect the TC and TE1
      Data List Display
      A/T Oil Pressure

    7. Observe "A/T Oil Pressure" in the Data List.

    8. According to the display on the GTS, read the Data List.


      Powertrain > Engine > 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:


      • 4.2 to 5.5 MPa (42.8 to 56.1 kgf/cm2, 609 to 798 psi): D position stall speed test

      • 3.1 to 4.5 MPa (31.6 to 45.9 kgf/cm2, 449 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 with motor assembly is operating)

      		 -
      Result
      Result Proceed to
      Data List value is normal A
      Data List value is not normal 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