Intake Valve Timing Intermediate Lock Control - Lock/Unlock Activation

Fig 1: Intake Valve Timing Intermediate Lock Control Lock/Unlock Activation Diagram

Courtesy of NISSAN NORTH AMERICA, INC.

When the ignition switch is turned OFF from the idle state, ECM activates the intake valve timing intermediate lock control solenoid valve to drain oil pressure. Accordingly, the lock key is activated by the spring, and the cam phase is fixed at the intermediate position.

When starting the engine by cold start, ECM activates the solenoid valve to maintain the condition that the cam phase is fixed at the intermediate position.

When the engine coolant temperature exceeds 60°C (140°F), ECM turns OFF the solenoid valve and starts normal intake valve timing control.