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.
Circuit Description
The DTC P1690 Rocker Arm Actuator Solenoid Control Circuit diagnostic monitors the electrical circuit of the rocker arm oil control solenoid. Rocker arm oil control solenoid enables the Powertrain Control Module (PCM) to operate the high speed cam system. High speed cam system significantly increases valve lift at engine speeds above 6000 RPM. A second camshaft lobe with a high lift profile is cast into each camshaft, alongside the low/medium speed lobes. Unique rocker arms follow both high speed and low/medium speed cam lobes. At engine speeds below 6000 RPM, low/medium speed cam lobes operate the rocker arms. When rocker arm oil control solenoid is turned ON between 6000-8200 RPM, rocker arms are operated by high speed cam lobes. Rocker arm oil control solenoid is controlled by a Pulse Width Modulated (PWM) signal from PCM. A fault in the solenoid control circuit will set a DTC P1690.
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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.