Intake Air System; Idle Control System; Throttle Body; Idle Air Control (Iac) Valve - Honda 2002 Accord Manual

Intake Air System
Refer to the System Diagram to see the functional
layout of the system.
Throttle Body
The throttle b o d y is a single-barrel side draft type. The
lower p o r t i o n of the throttle valve is heated by engine
coolant f r o m the cylinder head. The idle adjusting
screw, w h i c h increases/decreases bypass air, is located
on the t o p of the throttle body.
I D L E A D J U S T I N G
S C R E W
Idle Control System
W h e n the engine is cold, the A/C compressor is o n , the
transmission is in gear, the brake pedal is pressed,
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. Refer to the System Diagram to
see the functional layout of the system.
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 f r o m the ECM/PCM.
T o I N T A K E F r o m A I R
M A N I F O L D C L E A N E R
Power Steering Pressure (PSP) Switch
The PSP switch signals the ECM/PCM w h e n the power
steering load is high.
Starter (Ignition) Switch
The starter switch signals the ECM/PCM w h e n the
engine is cranking.
Brake Pedal Position Switch
The brake pedal position switch signals the ECM/PCM
w h e n the brake pedal is pressed.
(cont'd)
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