SFI SYSTEM, Diagnostic DTC:P1046, P1055

DTC Code DTC Name
P1046 VALVEMATIC Angle Difference (Driver)
P1055 VALVEMATIC Angle Difference (ECU)

DESCRIPTION

The VALVEMATIC system is able to continuously change the valve lift amount and valve timing. The VALVEMATIC system cooperates with the VVT-i to adjust the valve lift amount and valve timing optimally according to driving conditions. The ECM calculates the target intake air amount based on the amount the accelerator pedal is depressed and the engine speed to determine the value lift amount (duration), valve timing and throttle valve opening angle. The continuously variable valve lift controller assembly operates the actuator to adjust the duration to the duration requested by the ECM via CAN communication. The actual operating conditions are monitored by the sensors in the continuously variable valve lift controller assembly, which send the actual duration value to the ECM. The continuously variable valve lift controller assembly consists of the EDU, actuator, differential roller gear, angle sensor and position sensor.

A0058X5E02
Text in Illustration
*1 ECM *2 Continuously Variable Valve Lift Controller Assembly
*3 EDU *4 Actuator
*5 Differential Roller Gear *6 Position Sensor and Angle Sensor
*7 Engine *8 Continuously Variable Valve Train
DTC No. DTC Detection Condition Trouble Area

P1046

P1055

The actual duration differs from the requested duration by 14.5°CA or more for a certain period of time (1 trip detection logic).


  • P1046: Detected on the continuously variable valve lift controller assembly side

  • P1055: Detected on the ECM side


  • Continuously variable valve lift controller assembly

  • Camshaft housing

Perform the following procedures to confirm that the VALVEMATIC system is operating normally.


  1. Connect the GTS to the DLC3.

  2. Start the engine.

  3. Turn the GTS on.

  4. Enter the following menus: Powertrain / Engine and ECT / Active Test / Activate the VALVEMATIC (ENG ON).

    Note

    Make sure the following conditions are met when performing the Active Test.


    • The engine is running.

    • The engine coolant temperature is 40°C (104°F) or higher.

    • The vehicle is stationary.

    • The shift lever is in neutral.

    Result
    The "VALVEMATIC Current Angle" follows the "VALVEMATIC Target Angle".

Tech Tips

Perform a simulation test by referring to the engine coolant temperature and intake air temperature recorded in the freeze frame data.

When the Active Test results are abnormal, remove the continuously variable valve lift controller assembly from the camshaft housing and perform the "Activate the VALVEMATIC (ENG OFF)" Active Test with the removed continuously variable valve lift controller to determine whether the problem is with the continuously variable valve lift controller assembly or camshaft housing.

CAUTION / NOTICE / HINT

Tech Tips


  • If DTC P1047 is output at the same time as DTC P1046, disregard DTC P1047 and proceed with the inspection.

  • The VALVEMATIC system is monitored by the EDU (DTC P1046) in the continuously variable valve lift controller assembly and the ECM (DTC P1055). When a VALVEMATIC system malfunction is detected and DTC P1046 is not output, DTC P1055 is output.

  • After performing repairs, perform the following procedures and check that DTCs are not output again.


  1. Connect the GTS to the DLC3.

  2. Start the engine and warm it up.

  3. Turn the GTS on.

  4. Clear the DTCs Click here.

  5. Turn the ignition switch off and wait 10 seconds.

  6. Start the engine and idle it for 20 seconds.

  7. Clear the DTCs Click here.

  8. Turn the ignition switch off and wait 10 seconds.

  9. Start the engine and idle it for 20 seconds.

  10. Turn the ignition switch off and wait 10 seconds.

  11. Turn the ignition switch to ON.

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

  13. Read the DTCs.


  • After using the GTS to perform minimum valve lift learning, keep the engine idling for 30 seconds to complete learning. Otherwise, the VALVEMATIC system may not operate normally, causing poor acceleration, etc.

PROCEDURE


  1. CHECK ANY OTHER DTCS OUTPUT


    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.

      Result
      Result Proceed to
      DTC P1046 and/or P1055 A
      DTC P0112, P0113, P0115, P0117 or P0118 is output at same time as DTC P1046 and/or P1055 B

      Tech Tips


      • If an engine coolant temperature sensor malfunction DTC or intake air temperature sensor malfunction DTC is output at the same time as DTC P1046, check the corresponding temperature sensor first.

      • After repairing the temperature sensor, clear the DTCs, perform a simulation test and check that the temperature sensor DTC is not output.

      • When the temperature sensor DTC does not reoccur but DTC P1046 is output again, perform troubleshooting from the next step. If a DTC is not output, troubleshooting is complete.


    B
    A
  2. PERFORM ACTIVE TEST USING GTS


    1. Remove the continuously variable valve lift controller assembly from the camshaft housing 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 / Active Test / Activate the VALVEMATIC (ENG OFF).

    6. When the continuously variable valve lift controller assembly is operated using GTS, check whether the shaft moves Click here.

      Note


      • Make sure to perform the "Activate the VALVEMATIC (ENG OFF)" Active Test with the continuously variable valve lift controller assembly removed from the vehicle.

      • Perform the Active Test with the body of the continuously variable valve lift controller assembly connected to ground, as the continuously variable valve lift controller assembly is grounded through the body.

      Result
      GTS Operation Specified Condition
      Low VALVEMATIC Current Angle is 100 to 120 deg(CA) and shaft extends
      High VALVEMATIC Current Angle is 250 deg(CA) or more and shaft retracts

      Tech Tips


      • If the malfunction does not reoccur, refer to the engine coolant temperature and intake air temperature recorded in the freeze frame data and perform a simulation test.

      • Perform "Inspection After Repair" after replacing the camshaft housing or continuously variable valve lift controller assembly Click here.


    OK
    NG