Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSMAZDA20086 S SPORT, 4D HATCHBACK, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 5 (ENGINE CONTROLS - TESTS W/CODES - 2.3L)CIRCUIT TESTSDTC P0505 - IDLE CONTROL SYSTEM MALFUNCTIONCONDITION
2008 Mazda 6 s Sport, 4D Hatchback, Standard
DTC P0505 - Idle Control System Malfunction: Condition
2008 Mazda 6 s Sport, 4D Hatchback, StandardSECTION Condition
WARNING: This page is about a different car, the 1997 Mazda Millenia. However, it is still accessible from the selected car via links, so may be relevant.
DTC is set when actual engine speed is excessively higher or lower than target speed preset in ECM for more than 14 seconds. Possible causes are:
- Idle Air Control (IAC) valve malfunction.
- Leakage in intake air system.
- Open or short circuit between terminal "A" on IAC valve and main relay.
- Open or short circuit between terminal "B" on IAC valve and terminal No. 4M on Engine Control Module (ECM).
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.