Mitsubishi 1989-1993 GALANT Service Manual page 351

FUEL SYSTEM <DOHC> - Troubleshootina
agnostic On-board
trouble diagnostic
ode No.
item
13 Intake air
(1) The signal voltage of the
intake air temperature
sensor is 4.5V or higher.
(2) The signal voltage of the
intake air temperature
sensor is 0.27V or lower.
14 Throttle (1) The signal voltage of the
position throttle position sensor is
sensor
(2) Though the closed throttle
position switch is on, the
signal voltage of the
throttle position sensor is
Engine (1) The signal voltage of the
21
engine coolant
coolant
temperature sensor is
(2) The signal voltage of the
engine coolant
temperature sensor is
0.1 1 V or lower.
'(3) During engine
warming-up, the engine
coolant temperature
sensor signal indicates
that the engine coolant
temperature drops.
Crankshaft Though the engine is cranking
22
position 4 seconds or more, the signal
sensor voltage of the crankshaft
position sensor does not vary
(to be high/low).
Though the
Camshaft
23
position the signal voltage of the
camshaft position sensor does
sensor
not vary (to be high/low).
During acceleration of engine
Vehicle
24
revolution speed of 3,000 rpm
speed
sensor or more, the signal voltage of
the vehicle speed sensor does
(reed
not vary (to be high/low).
switch)
Diagnostic content
(1) The intake air temperature
(2) Open-circuit, short-circuit or
(3) The engine control module is
(1) The throttle position sensor is
(2) Open-circuit, short-circuit or
(3) The closed throttle position
(4) The closed throttle position
(5) The engine control module is
(1) The engine coolant
(2) Open-circuit, short-circuit or
(3) The engine control module is
(1) The crankshaft position sensor
(2) Open-circuit, short-circuit or
(3) The engine control module is
is running,
(1) The camshaft
(2) Open-circuit, short-circuit or
(3) The engine control module is
(1) The vehicle speed sensor is
(2) Open-circuit, short-circuit or
(3) The engine control module is
I
Major cause
sensor is troubled.
improper connector contact
occurs in the air intake
temperature sensor circuit.
troubled.
troubled or improperly
adjusted.
improper connector contact
occurs in the throttle position
sensor circuit.
switch ON is troubled.
switch signal line is
short-circuited.
troubled.
temperature sensor is troubled.
improper connector contact
occurs in the engine coolant
temperature sensor circuit.
troubled.
is troubled.
improper connector contact
occurs in the crankshaft
position sensor circuit.
troubled.
troubled.
improper connector contact
occurs in the camshaft position
sensor circuit.
troubled.
troubled.
improper connector contact
occurs in the vehicle speed
sensor circuit.
troubled.
I
Remarks (trouble
phenomenon, etc.)
Slightly improper
l
At high
l
temperatures,
(a) Improper start*
Slightly improper
l
acceleration
< M / T >
Improper
l
driveability
Engine stop
l
Engine stop
l
Racing is
l
impossible
During cold weather,
Starting is
l
impossible.*
Unstable idling*
l
acceleration*
Engine
l
impossible.
Engine
l
The engine
sometimes cuts off
when stopping after
deceleration.