Pilot 4WD V6-3.5L (2008)
Valve Deactivation Solenoid: Description and Operation
Variable Cylinder Management (VCM) System (J35Z1 Engine)
The i-VTEC (intelligent variable valve timing and lift electric control system) adopts a cylinder pause VTEC (variable cylinder system). The cylinder
pause VTEC system pauses the intake and exhaust valves on the rear bank under certain conditions such as cruise and fuel cut (see illustration). Since the
valves on the rear bank are closed, the frictional losses from valve spring compression and pumping are reduced because no air is compressed in the rear
bank. This reduces engine drag.
Operation
During 6 Cylinder Mode (intake valve side)
With the rocker arm oil control solenoid (VTEC solenoid valve) off, the rocker arm oil control valve (VTEC spool valve) directs oil pressure. Oil
pressure then enters the secondary rocker arm from the oil passage in the intake rocker shaft, and it moves the VTEC switching piston in the rocker arm.
This causes the VTEC switching piston to slide into primary rocker arm, locking primary rocker arm and the secondary rocker arm together. Primary
rocker arm is then actuated by the secondary rocker arm.
During 6 Cylinder Mode (exhaust valve side)
With the rocker arm oil control solenoid (VTEC solenoid valve) off, the rocker arm oil control valve (VTEC spool valve) directs oil pressure. Oil
pressure then enters secondary rocker arms A and B from the oil passage in the exhaust rocker shaft, and it moves the VTEC switching piston in the
rocker arm. This causes the VTEC switching pistons to slide into primary rocker arms A and B, locking primary rocker arms A and B to the secondary
rocker arms A and B. Secondary rocker arms A and B are then actuated by the primary rocker arms A and B.
