Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Electrical System Components
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).
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.