The valve lift motor changes the camshaft angle on command from the engine ECU, which allows the intake valve lift to be changed from minimum to maximum in 300 ms.
Purpose of connector contacts:
- contact 1 - 12V power supply;
- contact 2 - "ground".
Caution: Do not apply voltage directly to the valve lift motor to avoid damaging it.
If the engine ECU detects a malfunction in the valve lift control system (valve position sensor, valve lift motor temperature increase above 175°C, etc.), the electric motor control switches to emergency operation mode.
In this mode, air supply is controlled via an electrically driven throttle valve.
Note: In this mode, it has virtually no effect on engine operation.
If the engine ECU detects a malfunction of the valve lift change motor (blocking, temperature exceeding 190°C, malfunction of the motor power relay, etc.), the motor control is switched to emergency mode.
The engine control unit does not allow any more changes to the position of the intake valves, so the system remains in the last selected position. At the same time, the throttle valve is also used to control the amount of air supplied. However, the amount of air supplied depends on the position of the valves at the time of the malfunction, which significantly affects the operation of the engine.
Note: In this mode, it may not be possible to start the engine.