Idle Control System Diagram; Intake Air System Diagram - Honda Civic 2002-2003 Service Manual

Fuel and Emissions Systems
System Descriptions (cont'd)
Idle Control System Diagram
The idle speed of the engine is controlled by the Idle Air ControlllAC) valve:
• After the engine starts, the lAC 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 lAC valve is opened to obtain the proper fast idle speed. The
amount of bypassed air is controlled in relation to engine coolant temperature.
INTAKE MANIFOLD
THROTTLE BODY
Intake Air System Diagram
lAC VALVE INTAKE AIR DUCT
AIR CLEANER
YEL/BlK
--I11III
From
PGM·FI
BLK/ MAIN
RED RELAY
ECM/PCM
~
VARIOUS
y--- SENSORS
BlK
1
This system supplies air for engine needs. A resonator in the intake air pipe provides additional silencing as air is
drawn into the system.
11-36
'~'''~[(~~
AIR CLEANER
_--.-,
Y---=~:'-""
: J-_\
r7""9.i!iiii! -
F"l
I
,,::.>1
~
'2'
V
RESONATOR
INTAKE MANIFOLD
r
BLK YEl/BlK
---<l1lI
From
PGM-FI
BLK/ MAIN
RED RELAY
THROTTLE BODY
ECM/PCM
VARIOUS
SENSORS
BlK
1