On-Vehicle Inspection of
FUEL SYSTEM
VALVE>
Components
VALVE POSITION SENSOR
Equipment side
connector
Engine
control
module
valve position sensor
OPERATION
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The
valve position sensor converts the
changes (increase or decrease) in the valve
position of the idle air control motor into pulse
signals and inputs these signals to the engine
control module. The engine control module de-
termines the valve position from these signals
and also controls the idle air control motor.
l
power is supplied to the
valve position
sensor from the engine control module, and the
ground connection is positioned in the engine
control module.
l
power is applied to the two
valve posi-
tion sensor output terminals from the engine
control module. When the
valve position is
changed (increased or decreased) by the DC
motor inside the idle air control motor, the
valve position sensor generates a pulse signal
from the opening and closing between the out-
put terminal and the ground.
TROUBLESHOOTING HINTS
Hint 1: The
valve position sensor is the most
important sensor for controlling the idle
speed. If a malfunction develops when the
engine is idling and the engine load is varied
by turning the air conditioning switch to ON
and OFF, etc., this sensor is probably defec-
tive.
TSB Revision
Summary of Contents for 1989 Galant
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