13-274
FUEL SYSTEM <DOHC>
On-Vehicle Inspection of
Components
CLOSED THROTTLE POSITION SWITCH
Terminal
voltage
Throttle shaft
turning angle
Engine control module
Throttle position
sensor connector
Component
connector
Harness side
connector
OPERATION
l
The closed throttle position switch functions to
convert (to HIGH/LOW-level voltage) data as to
w h e t h e r t h e a c c e l e r a t o r i s d e p r e s s e d o r
r e -
leased, and to input that voltage (as signals) to
the engine control module. The engine control
module, based upon those signals, regulates the
idle air control motor.
TROUBLESHOOTING HINTS
If there is an abnormal condition of the closed throt-
tle position switch switch output even though the
results of the checking of the closed throttle posi-
tion switch harness and of the component itself in-
dicate a normal condition, the cause may be pre-
sumed to be one of the following.
l
Voltage within the engine control module is ap-
plied, by way of the resistance, to the closed
throttle position switch.
When the foot is taken off the accelerator, the
closed throttle position switch is switched ON,
so the current is grounded.
As a result, the closed throttle
terminal
voltage changes from HIGH to LOW level.
(1) Improper adjustment of the accelerator cable or
the automatic-cruise-control cable.
(2) Improper adjustment of the closed throttle posi-
tion switch (fixed SAS).
TSB
Revision
Summary of Contents for 1989 Galant
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