Mitsubishi 1989 Galant, Service Manual

Page: 266 / 1273

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