Mitsubishi 1989-1993 GALANT Service Manual page 267

FUEL SYSTEM <SOHC-16 VALVE> - Troubleshootinn
diagnostic
code No. item
24 Vehicle During acceleration of engine
speed revolution speed of 3,000 rpm
sensor or more, the signal voltage of
(reed
the vehicle speed sensor does
switch) not vary (to be high/low).
25 Barometric
(1) The signal voltage of the
pressure
sensor
(2) The signal voltage of the
36 Ignition The ignition timing adjusting
timing signal line is short-circuited to
adjusting the ground.
signal
41 Injector Injector is not continuously
driven for 4 seconds during
engine cranking or idle
operation.
43 During engine running after
EGR
warming-up,
(1) The EGR amount is small.
(2) The signal voltage of the
55
position the intended position (opening
sensor angle), even though idle air
control motor operates many
times.
Diagnostic content
barometric pressure
sensor is 4.5V or higher.
barometric pressure
sensor is 0.2V or lower.
(The signal voltage of the
EGR temperature sensor
is excessively high.)
EGR temperature sensor
is 0.1 V or less.
TSB Revision
Major cause
(1) The vehicle speed sensor is
troubled.
(2) Open-circuit, short-circuit or
improper connector contact
occurs in the vehicle speed
sensor circuit.
(3) The engine control module is
troubled.
(1) The barometric pressure sensor
is troubled.
(2) Open-circuit, short-circuit or
improper connector contact
occurs in the barometric
pressure sensor circuit.
(3) The engine control module is
troubled.
(1) The ignition timing adjusting
signal line is short-circuited to
the ground.
(2) The engine control module is
troubled.
(1) The injector is troubled.
(2) Open-circuit, short-circuit or
improper connector contact
occurs in the injector sensor
circuit.
(3) The engine control module is
troubled.
(1) The EGR valve is not opened.
(2) The negative pressure of the
EGR valve control is excessively
low.
(3) The EGR solenoid is troubled.
(4) The EGR temperature sensor is
troubled.
(5) Open-circuit, short-circuit or
improper connector contact
occurs in the EGR temperature
sensor circuit.
(6) The engine control module is
troubled.
(1) The IAC valve position sensor is
troubled.
(2) Open-circuit, short-circuit or
improper connector contact
occurs in the IAC valve position
sensor circuit.
(3) The idle air control motor (DC
motor) is troubled.
(4) Open-circuit, short-circuit or
improper connector contact
occurs in the idle air control
motor (DC motor) circuit.
(5) The engine control module is
troubled.
Remarks (trouble
phenomenon, etc.)
The engine
sometimes cuts off
when stopping afte
deceleration.
Unstable idling*
l
Improper
l
acceleration*
Improper
l
acceleration
Engine overheat
l
Unstable idling
l
Improper
l
acceleration
Deterioration of
l
exhaust gas
purifying
performance
l
Engine stops*
l
Unstable idling*
l