CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM, Diagnostic DTC:P0841, P2829

DTC Code DTC Name
P0841 Transmission Fluid Pressure Sensor/Switch "A" Circuit Range/Performance
P2829 Pressure Control Solenoid "K" Performance or Stuck Off

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/Switch "A" Circuit Range/Performance

Either one of the following conditions is met (1 trip detection logic):


  • When the requested oil pressure is 1.4 MPa (14.3 kgf/cm2, 203 psi) or more, the oil pressure sensor output is 0.5 MPa (5.1 kgf/cm2, 73 psi) or less for 2 seconds or more.

  • When the requested oil pressure is 1.0 MPa (10.2 kgf/cm2, 145 psi) or less, 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 for 3 seconds or more.

  • Oil pressure sensor

  • ECM

 Comes on DTC stored
P2829 Pressure Control Solenoid "K" Performance or Stuck Off

One of the following conditions is met (1 trip detection logic):


  • When the requested oil pressure is 1.0 MPa (10.2 kgf/cm2, 145 psi) or less, the oil pressure sensor output is 2.5 MPa (25.5 kgf/cm2, 363 psi) or more for 3 seconds or more.

  • When the vehicle speed is less than 8 km/h (5 mph), the ratio of the transmission revolution sensor (NIN) output speed and transmission revolution sensor (NOUT) output speed exceeds a specified value for 0.2 seconds or more.

  • When the oil pressure sensor output is less than 0.35 MPa (3.6 kgf/cm2, 51 psi) and the target gear ratio is 2.0 or more, the actual gear ratio is less than 1.0 for 1.5 seconds or more.

  • 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

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.

    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:


    • Do not perform a stall test if there are any people or objects near the vehicle.

    • Do not perform a stall test if any wheel chocks are out of position.

    • Do not perform the stall test on a slippery or low-friction surface that could allow the tires to spin.

    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 more than once, make sure to wait 15 seconds or more between tests.


    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.

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

    8. According to 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:


      • 2.7 to 5.4 MPa (27.5 to 55.1 kgf/cm2, 392 to 783 psi): D position stall test

      • 2.8 to 5.4 MPa (28.6 to 55.1 kgf/cm2, 406 to 783 psi): R position stall test

      		 -
      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.

      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.

      Click here

    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 and/or P2829 is output A
      DTC is 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.

      Click here

    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 P2829 is output A
      DTC is 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

  12. CLEAR DTC


    1. Clear the DTCs.

      Result
      Proceed to
      NEXT

    NEXT

    PERFORM INITIALIZATION Click here

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

    CAUTION:


    • Do not perform a stall test if there are any people or objects near the vehicle.

    • Do not perform a stall test if any wheel chocks are out of position.

    • Do not perform the stall test on a slippery or low-friction surface that could allow the tires to spin.

    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 more than once, make sure to wait 15 seconds or more between tests.


    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.

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

    8. According to 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:


      • 2.7 to 5.4 MPa (27.5 to 55.1 kgf/cm2, 392 to 783 psi): D position stall test

      • 2.8 to 5.4 MPa (28.6 to 55.1 kgf/cm2, 406 to 783 psi): R position stall test

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

    B

    REPLACE ECM Click here

    A

  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.

      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.

      Click here

    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 is 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. REPLACE ECM


    1. Replace the ECM.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    PERFORM INITIALIZATION Click here

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

    CAUTION:


    • Do not perform a stall test if there are any people or objects near the vehicle.

    • Do not perform a stall test if any wheel chocks are out of position.

    • Do not perform the stall test on a slippery or low-friction surface that could allow the tires to spin.

    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 more than once, make sure to wait 15 seconds or more between tests.


    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.

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

    8. According to 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:


      • 2.7 to 5.4 MPa (27.5 to 55.1 kgf/cm2, 392 to 783 psi): D position stall test

      • 2.8 to 5.4 MPa (28.6 to 55.1 kgf/cm2, 406 to 783 psi): R position stall test

      		 -
      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

  21. REPLACE ECM


    1. Replace the ECM.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    PERFORM INITIALIZATION Click here

  22. REPLACE CONTINUOUSLY VARIABLE TRANSAXLE ASSEMBLY


    1. Replace the continuously variable transaxle assembly.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    PERFORM INITIALIZATION Click here