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FUEL SYSTEM <SOHC-8 VALVE>
(2) Deposits adhering to the ttirottle valve.
(3) Air being taken into the intake manifold due to a
gasket leak, etc.
OPERATION
and is integrated in the ISC motor system. The slid-
ing pin of ISC motor position sensor is in contact
with the end of the plunger. Therefore, as the plun-
ger moves, the internal resistance of ISC motor pos-
ition sensor varies. This leads to the variation of the
output voltage. ISC motor position sensor detects
TROUBLESHOOTING HINTS
Since idling is not controlled when ISC motor posi-
tion sensor
is troubled, idling may not be evenly
maintained.
INSPECTION
Using Scan tool
Function
Item No.
Data reading 15
NOTE
The idle speed control motor position sensor output voltage may be about 500 mV 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
Data display
Inspection conditions
. Engine coolant tempera-
Sensor detec-
tion voltage
ture: 85-95'C (185-203°F)
. Lights, cooling fan, electrical
accessories: OFF
. Transaxle: neutral (A/T mod-
els: "P" range)
switch: ON (The compressor
clutch must be operating
when the air conditioning
switch is ON.)
Measure the power supply voltage of
the idle speed control motor position
TSB Revision
(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 ISC motor system, and
sends the signal to ECM. ECM processes the ISC
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 en-
gine idling.
Load conditions
Air conditioning
switch: OFF
Air conditioning
switch: ON
Air conditioning
switch: ON
Select lever:
shift to "D"
range.
Standard value
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Table of Contents
Troubleshooting
