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1998
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Civic GX, Standard
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Repair and Diagnosis
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Engine Performance
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System
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Idle Control System (GX)
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System Description
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Idle Control System
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DTC P0505: Idle control system malfunction
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Possible Cause
Possible Cause
IAC valve mechanical malfunction
Throttle body clogged port, improper adjustment
Intake manifold gasket leakage
Vacuum hose leakage
Vacuum leak
ECT sensor incorrect output
Fig 1: P0505: Idle Control System Troubleshooting Flowchart (1 Of 2)
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Fig 2: P0505: Idle Control System Troubleshooting Flowchart (2 Of 2)
Courtesy of AMERICAN HONDA MOTOR CO., INC.