Diagnostic Aids
WARNING: This page is about a different variant/trim than selected.
- With the engine idling at a normal operating temperature and all accessories OFF, monitor the following parameters on the scan tool:
- The IAC Motor Command-25 to 45 percent
- Engine speed-750 to 850 RPM
- Electrical load-No
- Commanded A/C-OFF
If any of the above parameters is outside of the typical value as indicated, inspect for the cause and repair as necessary.
- Inspect the carpet or floor mat for interfering with the free movement of the accelerator pedal.
- The scan tool can be used to isolate the cause of an intermittent DTC P0505. Engine idle speed can be controlled with the scan tool. Operate the IAC valve with the scan tool while checking for a smooth increase and decrease in engine speed. If engine speed can be controlled, the IAC system is functioning normally.
- Check for the following conditions:
- Any blockage of the air intake system
- Any blockage of the IAC passage
- Excessive deposits on the throttle plate or the throttle bore
- Any large vacuum leaks
- An intermittent malfunction may be caused by a fault in the IAC sensor electrical circuit. Inspect the wiring harness and the components for an intermittent condition. Refer to Intermittent Conditions .
- The information included in the Freeze Frame data can be useful in determining the vehicle operating conditions when the DTC first set.
- If the DTC P0505 does not reset, but a driveability symptom still exists, refer to Symptoms - Engine Controls .