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.
SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSHONDA2000ACCORD LX COUPE V6-3.0LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSDESCRIPTION AND OPERATIONIDLE CONTROL SYSTEM
2000 Honda Accord LX Coupe V6-3.0L
Idle Control System
2000 Honda Accord LX Coupe V6-3.0LSECTION Idle Control System
Idle Control System
When the engine is cold, the A/C compressor is On, the transmission is in gear, the brake pedal is pressed, the P/S load is high, or the alternator is charging, the PCM controls current to the IAC valve to maintain the correct idle speed. Refer to the System Diagram to see the functional layout of the system.
Idle Control System Diagram
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 amount of 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.
Brake Pedal Position Switch
The brake pedal position switch signals the PCM when the brake pedal is pressed.
Idle Air Control (IAC) Valve
To maintain the proper idle speed, the IAC valve changes the amount of air bypassing the throttle body in response to an electrical signal from the PCM.
Power Steering Pressure (PSP) Switch
The PSP switch signals the PCM when the power steering load is high.
Starter (Ignition) Switch
The starter switch signals the PCM when the engine is cranking.
When the engine is cold, the A/C compressor is On, the transmission is in gear, the brake pedal is pressed, the P/S load is high, or the alternator is charging, the PCM controls current to the IAC valve to maintain the correct idle speed. Refer to the System Diagram to see the functional layout of the system.
Idle Control System Diagram
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 amount of 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.
Brake Pedal Position Switch
The brake pedal position switch signals the PCM when the brake pedal is pressed.
Idle Air Control (IAC) Valve
To maintain the proper idle speed, the IAC valve changes the amount of air bypassing the throttle body in response to an electrical signal from the PCM.
Power Steering Pressure (PSP) Switch
The PSP switch signals the PCM when the power steering load is high.
Starter (Ignition) Switch
The starter switch signals the PCM when the engine is cranking.
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.