Mitsubishi 1989-1993 GALANT Service Manual page 266

FUEL SYSTEM <SOHC-16 VALVE> - Troubleshooting
Diagnostic On-board
trouble diagnostic
code No. item
Intake air (1) The signal voltage of the
13
re sensor
(2) The signal voltage of the
14 Throttle (1) The signal voltage of the
sensor
(2) Though the closed throttle (2) Open-circuit, short-circuit or
Engine (1) The signal voltage of the
21
coolant
re sensor
(2) The signal voltage of the
(3) During engine
22 Crankshaft Though the engine is cranking
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
intake air temperature
sensor is 4.5V or higher.
intake air temperature
sensor is 0.27V or lower.
throttle position sensor is
position switch is on, the
signal voltage of the
throttle position sensor is
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 intake air temperature
sensor is troubled.
(2) Open-circuit, short-circuit or
improper connector contact
occurs in the air intake
temperature sensor circuit.
(3) The engine control module is
troubled.
(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 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.
(1) The crankshaft position sensor
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.
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
At high
l
temperatures,
(a) Improper start
Slightly improper
l
acceleration
< M / T >
Improper
l
Engine stop
l
Engine stop
l
Racing is
l
impossible
During cold weather
Starting is
l
impossible*.
Unstable idling*
l
Improper
l
acceleration*
Engine stop
l
impossible.
Unstable idling*
l
acceleration*