From each preprogrammed mode, the GPEC1 adjusts valve timing based on operating conditions.
GPEC1 has calculated optimum intake valve timing of 112° after Top Dead Center and optimum exhaust valve tim-
ing of 97° before Top Dead Center. The GPEC1 pulse width modulates the oil control valves to advance or retard
the camshaft to their desired location. The spool valve inside the intake oil control valve is energized and moves to
allow pressurized oil into the advance chambers of the intake cam phaser. At the same time, the spool valve inside
the exhaust oil control valve is energized and moves to allow pressurized oil into the retard chambers of the exhaust
cam phaser. Oil enters the advance chambers of the intake phaser and the retard chambers of the exhaust phaser.
Oil pressure releases the lock pin from its locked position and pushes against the rotor vane. Both the rotor vanes
are moved, advancing the intake camshaft and retarding the exhaust camshaft.
REMOVAL
FRONT SOLENOID 1/1
1. Disconnect negative battery cable.
2. Remove engine cover.
3. Rotate hose clamp out of way.
4. Disconnect oil pressure sensor electrical connector.
5. Remove oil pressure sensor.
6. Disconnect variable valve timing solenoid electrical
connector.
7. Remove variable valve timing solenoid mounting
bolt.
PM
IGNITION CONTROL- SERVICE INFORMATION
8I - 65