P0505

P0505
The scan tool indicates Diagnostic Trouble Code (DTC) P0505: Idle control system malfunction.

NOTE: If DTC P15O8 is stored at the same time as DTC P0505, troubleshoot DTC P15O8 first, then troubleshoot DTC P0505.

Possible Cause
- AC valve mechanical malfunction
- Fast idle thermo valve malfunction
- Throttle body clogged port, improper adjustment
- Intake manifold gasket leakage
- Intake air hose loose leakage
- Vacuum hose leakage
- ECT sensor incorrect output
- Throttle Position sensor incorrect output