Circuit Description

WARNING: This page is about a different car, the 2003 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.

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.