Circuit/System Testing

WARNING: This page is about a different car, the 2009 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

Ignition OFF, open the hood to disable the Auto-Stop function.
Ignition ON, verify the scan tool hood position parameter displays Open.
- If the hood position does not display Open, refer to DTC P254F .
Engine operating, command the engine speed up to 1,400 RPM, down to 600 RPM, up to 1,400 RPM, and then exit using the scan tool. The engine speed should steadily increase and decrease as commanded.
- If the idle does not increase or decrease steadily, verify that one of the following conditions is not present:

Vacuum leaks
The throttle valve for the correct operation-A throttle valve that does not close correctly sets this DTC.
Restricted air intake system
The throttle body for damage and/or tampering
Incorrect or malfunctioning PCV system
Excess deposits in the throttle body
A parasitic load on the engine-For example, a transmission condition, a belt driven accessory condition

Repair the condition as necessary.