Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Acura 3.5RL 1996-2004 Approved srm RL9604S11112A
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Main Menu Table of Contents
Idle Control System
System Description
The idle speed of the engine is controlled by the Idle Air Control (IAC) Valve.
The valve changes the amount of air bypassing into the intake manifold in response to electric current controlled by the
PCM. When the IAC Valve is activated, the valve opens to maintain the proper idle speed.
From
PGM-FI
MAIN
RELAY
VARIOUS
SENSORS
ENGINE COOLANT
IDLE IAC VALVE
AIR
CONTROL
THERMAL
VALVE
INTAKE IDLE
MANIFOLD ADJUSTING
SCREW
1. After the engine starts, the IAC valve opens for a certain time. The amount of air is increased to raise the idle speed
about 150 - 300 rpm.
2. When the 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 the engine coolant temperature.
3. When the idle speed is out of specification and the scan tool does not indicate Diagnostic Trouble Code (DTC) P0505 or
P1508, check the following items:
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