Electrical System Components
WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
The PCM (5) constantly monitors the changes in engine status, such as engine speed (1), engine load (2), vehicle speed (3), and coolant temperature (4). The PCM directs the oil flow control module (412) to provide higher oil pressure to the intake valve rocker arms as required. The oil pressure switch (437) provides a signal to the PCM that oil pressure is present.
The following criteria is required for intake rocker arm activation:
- Engine speed of 4,400 RPM or greater
- Engine coolant temperature (ECT) sensor reading of 10°C (50°F) or greater
- Battery voltage of 10.5 volts or greater
- Transmission shift lever in a position other than P or N
- Engine has been running for longer than 5 seconds
- Additional information can be found within engine controls information. Refer to Rocker Arm Oil Control System Description in Engine Controls - 3.5L (L66).