Honda 2004 Odyssey, Service Manual

Page: 360 / 2459

３１
＊５２
Idle Control System Diagram
Intake Air System Diagram
11-51
VARIOUS SENSORS
INTAKE
MANIFOLD
ENGINE
COOLANT
IAC VALVE
BLK
BLK
BLK/
BLU
YEL/
BLK
PCM
From
PGM-FI
MAIN
RELAY
PCM
VARIOUS
SENSORS
INTAKE AIR
RESONATOR
AIR INTAKE DUCT
AIR TEMPERATURE
CONTROL VALVE
AIR CLEANER
INTAKE MANIFOLD
THROTTLE BODY
IAC VALVE
INTAKE AIR PIPE
From
PGM-FI
MAIN
RELAY
BLK
BLK/
RED
YEL/
BLK
INTAKE AIR
BYPASS CONTROL
THERMAL VALVE
ENGINE
COOLANT
BLK
The idle speed of the engine is controlled by the idle air control (IAC) 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.
• 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.
This system supplies air for engine needs. An intake air resonator in the intake air pipe provides additional silencing as
air is drawn into the system.
(cont’d)
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