Vibe FWD L4-1.8L VIN L (2005)
1.8L RPO - LNK Engine Valvetrain
During engine operation below 6,000 RPM, the rocker arms (8) follow the low/medium speed cam lobes (4). When engine oil is allowed to flow
unobstructed to the rocker arms, the arms follow the high speed cam lobes (3), increasing valve lift. The flow of engine oil to the rocker arms is
controlled by the rocker arm oil control solenoid valve. The solenoid is pulse width modulated (PWM) by the powertrain control module (PCM). The
rocker arm oil pressure switch detects oil pressure when the rocker arm oil control solenoid is ON. The oil pressure switch input enables the PCM to
monitor the operation of the rocker arm oil control solenoid. The rocker arm oil filter removes dirt and debris from the supply of engine oil to the
rocker arm shafts.
Rocker Arm Operation
