Mitsubishi 1989-1993 GALANT Service Manual page 156

13-14
FUEL SYSTEM <SOHC-8 VALVE> - Troubleshooting
trouble diagnostic
item
code No.
14 Throttle (1) The signal voltage of the
position
sensor
(2) Though the closed throttle (2) Open-circuit, short-circuit
Idle speed
15 (1) The signal voltage of the
control
motor
position
sensor (2) The signal voltage of the
(3) During idling, the signal
21 Engine (1) The signal voltage of the
coolant
re sensor
(2) The signal voltage of the
(3) During engine
22 Crankshaft
Though the engine is cranking (1) The crankshaft position sensor
position 4 seconds or more, the signal
sensor
voltage of the crankshaft
position sensor does not vary
(to be high/low).
Though the engine is running,
23 Camshaft
position
the signal voltage of the
sensor
camshaft position sensor does
not vary (to be high/low).
Diagnostic content
throttle position sensor is
position switch is on, the
signal voltage of the
throttle position sensor is
idle speed control motor
position sensor is 4.8V or
higher.
idle speed control motor
position sensor is 0.2V or
lower.
voltage of the idle speed
control motor position
sensor for the throttle
valve opening degree is
excessively low.
engine coolant
temperature sensor is
engine coolant
temperature sensor is
0.11 V or lower.
warming-up, the engine
coolant temperature
sensor signal indicates
that the engine coolant
temperature drops.
TSB Revision
Major cause
(1) The throttle position sensor is
troubled or improperly
adjusted.
improper connector contact
occurs in the throttle position
sensor circuit.
(3) The closed throttle position
switch ON is troubled.
(4) The closed throttle position
switch signal line is
short-circuited.
(5) The engine control module is
troubled.
(1) The idle speed control motor
position sensor is troubled.
(2) Open-circuit, short-circuit or
improper connector contact
occurs in the idle speed control
motor position sensor circuit.
(3) The throttle position sensor is
troubled or improperly
adjusted.
(4) Open-circuit, short-circuit or
improper connector contact
occurs in the throttle position
sensor circuit.
(5) The engine control module is
troubled.
(1) The engine coolant
temperature sensor is troubled.
(2) Open-circuit, short-circuit or
improper connector contact
occurs in the engine coolant
temperature sensor circuit.
(3) The engine control module is
troubled.
is troubled.
(2) Open-circuit, short-circuit or
improper connector contact
occurs in the crankshaft
position sensor circuit.
(3) The engine control module is
troubled.
(1) The camshaft position sensor is
troubled.
(2) Open-circuit, short-circuit or
improper connector contact
occurs in the camshaft position
sensor circuit.
(3) The engine control module is
troubled.
Remarks (trouble
phenomenon, etc.)
Slightly improper
l
acceleration
< M / T >
Or Improper
l
Engine stop
l
Engine stop
l
Engine stop*
l
During cold weather,
Starting is
l
impossible*.
Unstable idling*
l
acceleration*
Engine
l
impossible.
Unstable idling*
l
acceleration*