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 MANUALSHONDA2000ACCORD EX SEDAN L4-2254CC 2.3L SOHC (VTEC) MFIREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTDESCRIPTION AND OPERATIONIDLE CONTROL SYSTEM
2000 Honda Accord EX Sedan L4-2254cc 2.3L SOHC (VTEC) MFI
Idle Control System
2000 Honda Accord EX Sedan L4-2254cc 2.3L SOHC (VTEC) MFISECTION Idle Control System
When the engine is cold, the A/C compressor is on, the transmission is in gear, the brake pedal is depressed, the P/S load is high, or the alternator is charging, the ECM/PCM controls current to the IAC valve to maintain the correct idle speed.
The idle speed of the engine is controlled by the IAC (Idle Air Control) valve:
- After the engine starts, the IAC valve opens for a certain time. The amount of air is increased to raise the idle speed by about 150 - 300 rpm.
- When the engine coolant temperature is low, the IAC valve is opened to obtain the proper fast idle speed. The amount of bypassed air is thus controlled in relation to engine coolant temperature.
The idle speed of the engine is controlled by the IAC (Idle Air Control) valve:
- After the engine starts, the IAC valve opens for a certain time. The amount of air is increased to raise the idle speed by about 150 - 300 rpm.
- When the engine coolant temperature is low, the IAC valve is opened to obtain the proper fast idle speed. The amount of bypassed air is thus controlled in relation to engine coolant temperature.
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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.