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 MANUALSTOYOTA2004MATRIX XR, FWD, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 471 (ENGINE CONTROLS - DIAGNOSTICS)CIRCUIT INSPECTIONDTC P0505: IDLE AIR CONTROL SYSTEMTYPICAL MALFUNCTION THRESHOLDSIAC FUNCTIONAL CHECK
2004 Toyota Matrix XR, FWD, Standard
IAC Functional Check
2004 Toyota Matrix XR, FWD, StandardSECTION IAC Functional Check
WARNING: This page is about a different car, the 2004 Toyota RAV4. However, it is still accessible from the selected car via links, so may be relevant.
IAC FUNCTIONS CHECK
| Both of the conditions 1 and 2 are met | - |
| 1. Either of the conditions A or B is met | - |
| Condition A | Both of the following conditions (a) and (b) are met |
| (a) Engine RPM - Target engine RPM | Less than -100 RPM |
| (b) IAC flow rate learning value | 2.78 L/sec. (A/C: ON) |
| (b) IAC flow rate learning value | 2.08 L/sec. (A/C: OFF) |
| Condition B | Both of the following conditions (c) and (d) are met |
| (c) Engine RPM - Target engine RPM | More than 150 RPM (shift position: N and A/C: ON) |
| (c) Engine RPM - Target engine RPM | More than 200 RPM (shift position: D and A/C: OFF) |
| (d) IAC flow rate learning value | 0.55 L/sec. (shift position: N and A/C: ON) -0.17 L/sec. (shift position: D and A/C: OFF) |
| 2. Either of the conditions C or D is met | - |
| Condition C | - |
| IAC flow rate learning value for 0.5 sec. | Below 1.3 L/sec. or above 4.51 L/sec. |
| Condition D | Both of the following conditions (e) and (f) are met |
| (e) Number of the following condition is met | 5 times |
| (f) IAC flow rate learning value | gE "Value when fail is judged first" +1.55 L/sec. lE "Value when fail is judged first" -2.4 L/sec. |
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.