Mitsubishi 1989-1993 GALANT Service Manual page 352

FUEL SYSTEM <DOHC> - Troubleshooting
diagnostic
code No. item
Barometric
25 (1) The signal voltage of the
pressure
sensor
(2) The signal voltage of the
Open-circuit in the knock
31 Knock
sensor circuit.
sensor
41 Injector Injector is not continuously
driven for 4 seconds during
engine cranking or idle
operation.
Fuel pump The engine runs but power to
42
drive the motor is not supplied
to the fuel pump.
43 During engine running after
EGR
warming-up,
(1) The EGR amount is small.
(The signal voltage of the
EGR temperature sensor
is excessively high.)
(2) The signal voltage of the
EGR temperature sensor
is 0.1 V or less.
44 Ignition During engine running, the
ignition signal is not input.
However, cases in which
transistor ignition signals are input to all
unit
cylinders are excluded.
Diagnostic content
barometric pressure
sensor is 4.5V or higher.
barometric pressure
sensor is 0.2V or lower.
(5) Open-circuit, short-circuit or
(6) The engine control module
(1) The ignition coil is troubled.
(2) Open-circuit, short-circuit or
(3) The ignition power transistor
(4) The engine control module is
TSB Revision
Major cause
(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 knock sensor is troubled.
(2) Open-circuit, short-circuit or
improper connector contact
occurs in the knock sensor
circuit.
(3) 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) Open-circuit, short-circuit or
improper connector contact
occurs in the fuel pump power
supply circuit.
(2) The multiport fuel injection
relay is troubled.
(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.
improper connector contact
occurs in the EGR temperature
sensor circuit.
troubled.
improper connector contact
occurs in the igntion primary
circuit.
unit is troubled.
troubled.
Remarks (trouble
phenomenon, etc
Unstable idling*
l
Improper
l
acceleration*
acceleration*
Unstable idling
l
acceleration
Impossible start
l
Engine stop
l
Deterioration of
l
exhaust gas
purifying
performance
Unstable idling*
l
acceleration*
Improper start*
l