FUEL SYSTEM
VALVE>
Inspection of
Components
Improper adjustment of the basic idling speed.
(2) Deposits adhering to the ttirottle valve.
(3) Air being taken into the intake manifold due to a
gasket leak, etc.
OPERATION
motor position sensor is a variable resistor type,
and is integrated in the
motor system. The slid-
ing pin of
motor position sensor is in contact
with the end of the plunger. Therefore, as the plun-
ger moves, the internal resistance of
motor pos-
ition sensor varies. This leads to the variation of the
(4) Improper seating of the EGR valve seat.
(5) lmcomplete combustion within a cylinder. (Mal-
function of spark plugs, ignition coil, injectors,
compression pressure, etc.)
the plunger position of the
motor system, and
sends the signal to ECM. ECM processes the
motor position sensor signal, idle signal, coolant
temperature signal, load signal (A/T A/C) and ve-
hicle speed signal to control the opening angle of
the throttle valve and revolution speed during
output voltage.
motor position sensor detects
gine idling.
TROUBLESHOOTING HINTS
Since idling is not controlled when
motor posi-
tion sensor
is troubled, idling may not be evenly
maintained.
INSPECTION
Using Scan tool
Function
Item No.
Data display
Inspection conditions
Load conditions
Standard value
Data reading 15
Sensor
. Engine coolant
Air conditioning
1,300
tion voltage
ture:
switch: OFF
. Lights, cooling fan, electrical
accessories: OFF
Air conditioning
1,800
. Transaxle: neutral (A/T
switch: ON
els:
range)
Closed throttle position
Air conditioning
1,900
switch: ON (The compressor
switch: ON
clutch must be operating
Select lever:
when the air conditioning
shift to “D”
switch is ON.)
range.
Engine: running at idle
NOTE
The idle speed control motor position sensor output voltage may be about 500
higher than indicated above when
the vehicle is new [driven approximately 500 km (300 miles) or less].
Caution
Before shifting the select lever to the “D” range, apply the brakes to prevent the vehicle from moving forward.
HARNESS INSPECTION
Measure the power supply voltage of
the idle speed control motor position
TSB Revision
Содержание 1989 Galant
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