Mike's Workshop Manuals
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Toyota
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2003
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Highlander Base, 2.4 D, AWD
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Repair and Diagnosis
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Engine Performance
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System
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Engine Control System Self Diagnostics - 4-Cylinder
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Diagnostic Tests
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DTC P0505: Idle Control System Malfunction
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Possible Causes
Possible Causes
Open or short in Idle Air Control (IAC) valve circuit.
IAC valve is stuck open or closed.
Open or short in A/C switch circuit.
Defective air induction system.
Defective ECM.