Advanced Diagnostics

Advanced Diagnostics - DTC P1009: Variable Valve Timing Control (VTC) Advance Malfunction






General Description
The variable valve timing control (VTC) system controls the timing of the intake camshaft. It uses oil pressure to operate the VTC actuator so the valve timing is optimized depending on driving conditions. The engine control module (ECM)/powertrain control module (PCM) monitors the phase control command and the actual timing of the camshaft by using camshaft position (CMP) sensor A. If an over-advanced camshaft phase (compared to the directed value) continues or when the camshaft phase is otherwise abnormal, a malfunction is detected and a DTC is stored.

Monitor Execution, Sequence, Duration, DTC Type, OBD Status






Enable Conditions






Malfunction Threshold
When the camshaft phase value is not 48.8° or less within the monitored area (camshaft phase control directed value plus failure judgment value) after 4 seconds have passed, or when the camshaft phase value is 20.0° or less and continues for 4 seconds or more, even when the VTC does not actuate.

Driving Pattern
Start the engine and let it idle.

Diagnosis Details

Conditions for setting the DTC
When a malfunction is detected, the MIL comes on and a Pending DTC, a Confirmed DTC, and the freeze data are stored in the ECM/PCM memory.

Conditions for clearing the DTC
The MIL is cleared if the malfunction does not return in three consecutive trips in which the diagnostic runs. The MIL, the Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command or by disconnecting the battery.