Test 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 numbers below refer to the step numbers in the diagnostic procedures.
- 1 - The Diagnostic System Check - Engine Controls prompts the technician to complete some basic checks and store freeze frame data, if applicable. This creates an electronic copy of data taken when fault occurred. Information is then stored in scan tool for later reference.
- 4 - This step checks the operation of rocker arm oil control solenoid. This inspection is to be performed when vehicle is at normal operating temperature with engine speed at 1500-2500 RPM. Turning ON the rocker arm oil control solenoid will increase valve lift enough to cause a significant drop in engine speed.
- 8 - This step checks for electrical resistance in wiring and connections of rocker arm oil control solenoid circuit. Circuit resistance as small as 45 ohms can cause a DTC P1690 to set.