DTC P25DF: General Description

Courtesy of HONDA, U.S.A., INC.

The variable valve timing control (VTC) system controls the phase of the intake camshaft. It uses a motor to operate the VTC actuator so the valve timing is optimized depending on driving conditions. The powertrain control module (PCM) monitors the phase control command and the actual timing of the camshaft by using the camshaft position (CMP) sensor A. If the phase difference between them is excessive for a certain time period, the PCM detects a malfunction and stores a DTC.