DTC P10A0: VALVEMATIC Angle Difference(CSS); DTC P1055: VALVEMATIC Angle Difference (ECU) [06/2015 - ]: 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 valve 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 sends 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.
| *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. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Memory |
|---|---|---|---|---|---|
| P1055 | VALVEMATIC Angle Difference (ECU) | The actual duration differs from the requested duration by 14.5°CA or higher for a certain period of time (1 trip detection logic). |
|
Comes on | DTC stored |
| P10A0 | VALVEMATIC Angle Difference(CSS) | The actual duration differs from the requested duration by 14.5°CA or higher for a certain period of time (1 trip detection logic). |
|
Comes on | DTC stored |
Perform the following procedures to confirm that the VALVEMATIC system is operating normally.
- Connect the Techstream to the DLC3.
- Start the engine.
- Turn the Techstream on.
- Enter the following menus: Powertrain / Engine and ECT / Active Test / Activate the VALVEMATIC(ENG ON) / Gas Valve Control / VALVEMATIC Current Angle and VALVEMATIC Target Angle.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 P or neutral.
Result
The "VALVEMATIC Current Angle" follows the "VALVEMATIC Target Angle".
HINT:
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 sub-assembly and perform the "Activate the VALVEMATIC(ENG OFF)" Active Test with the continuously variable valve lift controller assembly removed to determine whether the problem is with the continuously variable valve lift controller assembly or camshaft housing sub-assembly.