CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM, Diagnostic DTC:P0841 and 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 Code

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 higher.

  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 difference between the calculated primary pulley pressure and target primary pulley pressure is 2.0 MPa (20.4 kgf/cm2, 290 psi) or higher.

  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 difference between the calculated primary pulley pressure and target primary pulley pressure is below 0.5 MPa (5.1 kgf/cm2, 73 psi).

  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 a specified value.

  3. 0.2 seconds

  4. 1-trip detection logic

  1. The oil pressure sensor output value is below 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. 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 the 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.

    5. Read the DTCs using the GTS.

      Tip:

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

      Table 1. 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

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

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

    GO TO DTC CHART

    (Click here)

  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.

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

    8. In accordance with the display on the GTS, read the Data List.

      Table 2. 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:

      • 4.1 to 5.3 MPa (41.9 to 54.0 kgf/cm2, 594.5 to 768.5 psi): D position stall test

      • 4.3 to 5.3 MPa (43.9 to 54.0 kgf/cm2, 623.5 to 768.5 psi): R position stall test

      -
      Table 3. Result

      Result

      Proceed to

      Data display is within Normal Condition range

      A

      Data display is not within Normal Condition range

      B

    REPLACE OIL PRESSURE SENSORClick here

  3. REPLACE ECM

    1. Replace the ECM (Click here).

    PERFORM INITIALIZATION

    (Click here)

  4. REPLACE OIL PRESSURE SENSOR

    1. Replace the oil pressure sensor (Click here).

  5. CLEAR DTC

    1. Clear the DTCs (Click here).

  6. PERFORM INITIALIZATION

    Note:

    • Performing reset memory will clear the learned values of both the yaw rate sensor (deceleration sensor zero point calibration) and CVT oil pressure (CVT oil pressure calibration). Make sure to perform reset memory, yaw rate 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 sensor

    • After performing reset memory, always perform yaw rate 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, yaw rate sensor calibration (deceleration sensor zero point calibration) and CVT oil pressure calibration (Click here).

    2. Check for DTCs again (Click here).

  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.

    6. Read the DTCs using the GTS.

      Table 4. Result

      Result

      Proceed to

      DTC P0841 and/or P2829 is output

      A

      DTCs are not output

      B

    END

  8. REPLACE ECM

    1. Replace the ECM (Click here).

  9. PERFORM INITIALIZATION

    Note:

    • Performing reset memory will clear the learned values of both the yaw rate sensor (deceleration sensor zero point calibration) and CVT oil pressure (CVT oil pressure calibration). Make sure to perform reset memory, yaw rate 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 sensor

    • After performing reset memory, always perform yaw rate 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, yaw rate sensor calibration (deceleration sensor zero point calibration) and CVT oil pressure calibration (Click here).

    2. Check for DTCs again (Click here).

  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.

    6. Read the DTCs using the GTS.

      Table 5. Result

      Result

      Proceed to

      DTC P2829 is output

      A

      DTCs are not output

      B

    END

  11. REPLACE CONTINUOUSLY VARIABLE TRANSAXLE ASSEMBLY

    1. Replace the continuously variable transaxle assembly (Click here).

    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.

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

    8. In accordance with the display on the GTS, read the Data List.

      Table 6. 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:

      • 4.1 to 5.3 MPa (41.9 to 54.0 kgf/cm2, 594.5 to 768.5 psi): D position stall test

      • 4.3 to 5.3 MPa (43.9 to 54.0 kgf/cm2, 623.5 to 768.5 psi): R position stall test

      -
      Table 7. Result

      Result

      Proceed to

      Data display is within Normal Condition range

      A

      Data display is not within Normal Condition range

      B

    REPLACE OIL PRESSURE SENSORClick here

  13. REPLACE ECM

    1. Replace the ECM (Click here).

    PERFORM INITIALIZATION

    (Click here)

  14. REPLACE OIL PRESSURE SENSOR

    1. Replace the oil pressure sensor (Click here).

  15. CLEAR DTC

    1. Clear the DTCs (Click here).

  16. PERFORM INITIALIZATION

    Note:

    • Performing reset memory will clear the learned values of both the yaw rate sensor (deceleration sensor zero point calibration) and CVT oil pressure (CVT oil pressure calibration). Make sure to perform reset memory, yaw rate 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 sensor

    • After performing reset memory, always perform yaw rate 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, yaw rate sensor calibration (deceleration sensor zero point calibration) and CVT oil pressure calibration (Click here).

    2. Check for DTCs again (Click here).

  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.

    6. Read the DTCs using the GTS.

      Table 8. Result

      Result

      Proceed to

      DTC P0841 is output

      A

      DTCs are not output

      B

    END

  18. REPLACE ECM

    1. Replace the ECM (Click here).

    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.

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

    8. In accordance with the display on the GTS, read the Data List.

      Table 9. 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:

      • 4.1 to 5.3 MPa (41.9 to 54.0 kgf/cm2, 594.5 to 768.5 psi): D position stall test

      • 4.3 to 5.3 MPa (43.9 to 54.0 kgf/cm2, 623.5 to 768.5 psi): R position stall test

      -
      Table 10. Result

      Result

      Proceed to

      Data display is within Normal Condition range

      A

      Data display is not within Normal Condition range

      B

    REPLACE CONTINUOUSLY VARIABLE TRANSAXLE ASSEMBLYClick here

  20. REPLACE ECM

    1. Replace the ECM (Click here).

    PERFORM INITIALIZATION

    (Click here)

  21. REPLACE CONTINUOUSLY VARIABLE TRANSAXLE ASSEMBLY

    1. Replace the continuously variable transaxle assembly (Click here).

    PERFORM INITIALIZATION

    (Click here)