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 MANUALSFORD2004FOCUS ZX3, 2.3 Z, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - POWERTRAIN DTC CHARTS & DESCRIPTIONS - CNG, FLEX-FUEL & GASOLINEDIAGNOSTIC TROUBLE CODE (DTC) CHARTSP0505: IDLE AIR CONTROL SYSTEM MALFUNCTION (ALL OTHERS)
2004 Ford Focus ZX3, 2.3 Z, Standard
P0505: Idle Air Control System Malfunction (All Others)
2004 Ford Focus ZX3, 2.3 Z, StandardSECTION P0505: Idle Air Control System Malfunction (All Others)
P0505 - IDLE AIR CONTROL SYSTEM MALFUNCTION (ALL OTHERS)
| Description: | The PCM attempts to control engine speed during the KOER self-test. The test fails when the desired RPM could not be reached or controlled during the self-test. | ||
| Possible Causes: |
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| Diagnostic Aids: | The IAC solenoid resistance is 6 to 13 ohms. Monitor the IAC PID duty cycle and/or voltage. | ||
| Application | Key On Engine Off | Key On Engine Running | Continuous Memory |
| All others | GO to PINPOINT TEST KE: IDLE AIR CONTROL (IAC) VALVE Step 2. | GO to PINPOINT TEST KE: IDLE AIR CONTROL (IAC) VALVE Step 2. | GO to PINPOINT TEST KE: IDLE AIR CONTROL (IAC) VALVE Step 2. |
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.