FUEL SYSTEM <DOHC> Troubleshooting
O n - b o a r d
diagnostic
code No.
item
Diagnostic content
Major cause
Remarks
phenomenon, etc
25
Barometric
(1) The signal voltage of the
(1) The barometric pressure sensor
l
Unstable idling*
pressure
barometric pressure
is troubled.
l
Improper
sensor
sensor is
or higher.
(2) Open-circuit, short-circuit or
acceleration*
(2) The signal voltage of the
improper connector contact
Improper start*
barometric pressure
occurs in the barometric
sensor is
or lower.
pressure sensor circuit.
(3) The engine control module is
troubled.
31
Knock
sensor
Open-circuit in the knock
sensor circuit.
(1) The knock sensor is troubled.
(2) Open-circuit, short-circuit or
improper connector contact
occurs in the knock sensor
circuit.
Improper
acceleration*
(3) The engine control module is
troubled.
41
Injector
Injector is not continuously
driven for 4 seconds during
engine cranking or idle
operation.
(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.
l
Unstable idling
Improper
acceleration
Improper start
42
Fuel pump
The engine runs but power to
(1) Open-circuit, short-circuit or
l
Impossible start
drive the motor is not supplied
improper connector contact
l
Engine stop
to the fuel pump.
occurs in the fuel pump power
supply circuit.
(2) The
fuel injection
relay is troubled.
(3) The engine control module is
troubled.
43
EGR
During engine running after
(1) The EGR valve is not opened.
l
Deterioration of
warming-up,
(2) The negative pressure of the
exhaust gas
(1) The EGR amount is small.
EGR valve control is excessively
purifying
(The signal voltage of the
low.
performance
EGR temperature sensor
(3) The EGR
is troubled.
is excessively high.)
(4) The EGR temperature sensor is
(2) The signal voltage of the
troubled.
EGR temperature sensor
(5) Open-circuit, short-circuit or
is 0.1 or less.
improper connector contact
occurs in the EGR temperature
sensor circuit.
(6) The engine control module
troubled.
44
Ignition
During engine running, the
(1) The ignition coil is troubled.
l
Unstable idling*
ignition signal is not input.
(2) Open-circuit, short-circuit or
Improper
power
However, cases in which
improper connector contact
acceleration*
transistor
ignition signals are input to all
occurs in the igntion primary
l
Improper start*
unit
cylinders are excluded.
circuit.
(3) The ignition power transistor
unit is troubled.
(4) The engine control module is
troubled.
TSB Revision
Summary of Contents for 1989 Galant
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