On-Vehicle Inspection of
FUEL SYSTEM
VALVE>
Components
IDLE AIR CONTROL MOTOR (DC MOTOR)
Harness
connector
Equipment
connector
Engine control module
Idle air control motor
Engine control module connector
OPERATION
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The volume of intake air during engine idling is
controlled by the opening and closing of the
valve for bypassing the throttle valve, located at
the air intake port.
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The
valve opens and closes depending on
whether the DC motor inside the idle air control
motor is turning clockwise or anti-clockwise.
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The DC motor turns clockwise or anti-clockwise
according to the change in the direction of cur-
rent in the motor drive inside the engine con-
trol module.
TROUBLESHOOTING HINTS
Hint 1: While the engine is idling, if the idle speed
and
valve position (step) change when
the air conditioning switch is turned to ON
and OFF, it can be assumed that the idle air
control motor and the
valve position
sensor are operating normally.
Hint 2: If the
valve position (step) is outside the
standard position, the malfunction is prob-
ably one of the following:
Basic idle speed adjustment is wrong.
Some deposit is adhering to the throttle
valve.
(3) Air is being drawn into the air intake
manifold through a defectivegasket seal.
EGR valve sheet adhesion is defective.
(5) Combustion malfunction inside a cylin-
der.
(Spark plug, ignition coil, injector or
compression pressure is defective.)
TSB Revision
Summary of Contents for 1989 Galant
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