Circuit/System Testing

Engine operating, command the engine speed up to 1,400 RPM, down to 600 RPM, up to 1,400 RPM, and then exit with a 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 valve
• 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.