check engine MITSUBISHI GALANT 1989 Service Manual PDF
[x] Cancel search | Manufacturer: MITSUBISHI, Model Year: 1989, Model line: GALANT, Model: MITSUBISHI GALANT 1989Pages: 1273, PDF Size: 37.62 MB
Page 190 of 1273
13-48 FUEL SYSTEM
Check for continuity between the
checking terminal and the engine
control module, and between the
multiport fuel Injection relay termi-nals.
connector
01 A0579
.
Multiport fuel injection relay con-
nector: Disconnected
. Engine control module connec-
tor: Disconnected
. Fuel pump connector: Discon-
netted
Repair the
harness.
Measure the power supply voltage of
the
multiport fuel injection relay.
.
Multiport fuel injection relay con-
Harness sideconnector
Engine control
module harnessCheck for an open-circuit, or a short-
side connectorcircuit to ground, between the multi-port fuel injection relay and the en-
gine control module.
. Multiport fuel injection relay con-
nectar:
Disconnected
. Engine control module connec-
tor: Disconnected Repair
the-+ harness.
(@a-8)
Harness side
connector
@
Check for continuity, of the ground
circuit.
- Multiport fuel injection relay con-
nectar:
Disconnected.
Repair
theharness.
a vmil-Ground)
@ Harness sideconnector
Check for an open-circuit, or a short-circuit to ground, between the multi-port fuel injection relay and the fuel
w-we Multiport fuel injection relay con-
nector: Disconnected
. Fuel pump connector: Discon-
nettedRepair the-+ harness.
GilIl-@El)T
OlA0401
MULTIPORT FUEL INJECTION RELAY INSPECTION
Refer to P.13-44.
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Page 192 of 1273
13-50 FUEL SYSTEM
INSPECTION
Using Scan Tool
Item No. Data display Inspection conditions
12Sensor de-
tection air
volume (fre-
quency) . Engine coolant
temperature: 85-95°C(185-205°F). Lights, cooling fan, elec-
trical accessories: OFF
. Transaxle: neutral (iVT
models: “P” range)
RacingFrequency in-
creases as racing
rpm increases.
NOTEThe volume air flow sensor output frequency may be about 10% higher than\
indicated above when the vehicle is new [driven approximately 500 km (300 miles) or less].
Regular waveform 03A0203
HARNESS INSPECTION
@
Harness sideconnector
6
0-0
~
0
=
Using Oscilloscope
(1) Run the engine at idle speed.
(2) Connect the probe to the
osilloscope pick-up point a
s
shown in the circuit diagram, and check the wave form.
Measure the power supply voltage.
. Connector: Disconnected
. Ignition switch: ON
--P
IRepair the
Harness sideconnector
Measure the terminal voltage.
. Connector: Disconnected
. Ignition switch: ON ~
0
OK’ 30
Repair the
harness
.
cm-an)
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Page 193 of 1273
FUEL SYSTEM
Harness side
Check for continuity of the ground
circuit.
. Connector: Disconnected
@+A
Repair the
harness.
@3l-FiBill
J
INTAKE AIR TEMPERATURE SENSORMlJYGAA
Volume air flow
sensor)
\
Intake air
temperature sensor Temperature 16Z456
L- @ Volume air flow
sensor connector
Harness side connector
I
rEGine control module A 24,
wTemperature1621008
&5V1
7FUO479
OPERATION
lThe intake air temperature sensor functions to sensor; it passes through the intake air temper-
convert the temperature of the air (intaken to
ature sensor, which is a type of resistor, and is
the engine) to voltage, and to input that voltage grounded at the engine control module.
(as signals) to the engine control module. The Note that the resistance of the intake air
tem-
engine control module, based upon those sig-perature sensor decreases when the tempera-
nals, then corrects the amount of fuel injection,
ture of the intake air increases.
etc.lThe intake air temperature sensor terminal vol-
lThe 5V power supply within the engine control
tage becomes higher when the resistance of
module is supplied, by way of the resistance the intake air temperature sensor increases, and
within the unit, to the intake air
temperatur
e
becomes lower when the resistance decreases.
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Page 194 of 1273
13-52 FUEL SYSTEM
Consequently, the intake air temperature sensor
terminal voltage varies in accordance with the
temperature of the intake air, becoming lower
when the temperature of the intake air in-
creases. TROUBLESHOOTING HINTS
Because the intake air temperature sensor detects
the temperature of the intake air in the air cleaner, it
indicates a temperature different than the
tempera-
ture of the outside air when the engine is running.
INSPECTION
Using Scan tool
Function Item
No.
Data reading 13 Data display
Sensor de-tectlontemperature
connector
-,-S=
[
a
ry:
EQO
n
OlRO262
Check conditions
Ignition switch: ON
Or, engine running Intake air temp.
At
-20°C (-4°F)
At 0°C (32°F)
Standard value -20°C
0°C
IAt60~) I 80°CI
HARNESS INSPECTION
I
@ Harness sideconnector 8 0-0
Jill
I54
T
Volume air flowsensor side connector
Check for continuity of the ground
circuit.
. Connector: Disconnected
/-
/OKcl2
--/
Repair theharness.
@El-lT$lH)
IMeasure the power supply voltage.
Connector: Disconnected Ignition
switch: ON
IASTOPVoltage (V)
1 4.5-4.9 1
SENSOR INSPECTION
(1) Disconnect the volume air flow sensor connectors.
(2) Measure resistance between terminals @
and
@.
6FUO622
Temperature “C (“F)
0(32)
20(68)
80 (176)
Resistance (kS2)
6.0
2.7
0.4A
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Page 196 of 1273
13-54 FUEL SYSTEM
TROUBLESHOOTING HINTS Hint 1: Hint 2:
If there is a malfunction of the barometric-pressure If, during high-speed driving, there is a noticeable
sensor,
driveability of the vehicle will become worse sharp drop of the displayed pressure of th
e
barometric-rxessure sensor, check for clogging ofparticularly at hig’h altitude
.
the air cleaner.
INSPECTION Using Scan tool
AltitudeStandard valueICheck conditions
Item No. Data display
25Sensor detec-
tion pressure
Function
Data reading
Ignition switch: ON
At 0 m (0 ft.) 760 mmHg
At 600
m(1,969ft.j710 mmHg
I
At 1,200 m660
mmHg(3,937
ft.)
At 1,800
m(5,906 ft.) 610 mmHgI
HARNESS INSPECTION
Check for continuity of the ground
circuit.
. Connector: Disconnected
connector
L,?
la
Fi
gg-CI
e
Repair the
harness.
KBEil-IBHZI)
Measure the power supply voltage of
the barometric oressure
sensor.
. Connector: Disconnected
. Ignition switch: ON
Harness side
connector
Check for an open-circuit or a short-circuit to ground between the engine
control module and the barometric pressure sensor.
f Volume air flow sensor connector: Disconnected
Engine control
module harness
@ Harness sideside connector
Engine control module connec-
tor: Disconnected Repair the
harness.
ozsEl-~)
1 TSB Revision
Page 198 of 1273
13-56 FUEL SYSTEM
INSPECTION
Using Scan tool
FunctionItem No.
Data reading
-*LI
Data display
Sensor de-
tection
temperature
HARNESS INSPECTION
connector OlLO461Check conditions
Ignition switch: ON
Or, engine running Coolant temperature
Standard value
At
-20°C (-4°F)-20°C
At 0°C (32°F)0°C I
At
20°C (68°F)20°C
connector - Ic
OIL0463L
-16R1251
Temperature “C (“F)Resistance (kS2)
0 (32)5.9
20 (68)2.5
40 (104)1.1
80 (176) 0.3
(3) If the resistance deviates from the standard value greatly
replace the sensor.
J
TSB Revision
At 40°C (104°F)40°C
At 80°C (176°F)80°C
1
Check for continuity of the ground
circuit.
. Connector: Disconnected
Repair the
harness.
b&XII-@.
lm
Measure the power supply voltage.I. Connector: Disconnected
Ignition switch: ONVoltage
(VI
SENSOR INSPECTION
(1) Remove engine coolant temperature’ sensor from the
intake manifold.
(2) With temperature sensing portion of engine coolan
t
temperature sensor immersed in hot water check resist-
ance.
Page 200 of 1273
13-58 FUEL SYSTEM
TROUBLESHOOTING HINTS
Hint 1:Hint 2:
The signals of the throttle-position sensor are more If the voltage of the throttle-position sensor deviates
important for control of the automatic transaxle than from the standard value, check once again after
for control of the engine; shifting “impact shocks” making the throttle-position sensor adjustment.
are produced if there is a malfunction of the
throttle-position sensor.
INSPECTION
Using Scan tool
Function/ Item No.1 Data display 1 Inspection conditions1 Throttle valve1 Standard value
Data reading 14 Sensor
vol-tageIgnition switch: ON held
for 15 sec. or more
HARNESS INSPECTION
E q-0
JJ ~
@ Harness side0
connector
@ Harness sideconnector
Harness side
connector
Measure the power supply voltage of
the throttle position sensor.
. Connector:’ Disconnected
. Ignition switch: ON
Check for continuity of the ground
circuit.
Connector: Disconnected
Repair the
harness.
bZilZl-m* &I)
Check for an open-circuit, or a short-
circuit to ground, between the engine
control module and the throttle posi-
. Throttle position sensor connector: Engine control module connector:
Disconnected Repair the
harness.
Fi&TUI-mj
01103611
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Page 202 of 1273
13-60 FUEL SYSTEM
OPERATION
TROUBLESHOOTING HINTS
INSPECTION-Using Scan tool
Refer to P.13-57.
HARNESS INSPECTION
Measure the power supply voltage of
the throttle positlon
sensor.
. Connector: Disconnected
. Ignition switch: ON
6FU1241
. Connector: Disconnected
6FU1242
Er’ ”I
miglne controlodule harnessCheck for an open-circuit, or a short-
side connectorcircuit to ground between the engineIcontrol module and the throttle posi-
tion sensor.
19
!!F!=6FU1243
. Throttle position sensor connector: Disconnected0
OK
. Engine control module connector:
Disconnectedr
ASTOP
L
I\:
Throttle posltlon/
sensor connector6FU1244
Repair the
harness.
i
K292Ha)
SENSOR INSPECTION
(1) Disconnect the throttle position sensor connector.
(2) Measure resistance between terminal @ (sensor ground)
and terminal
@ (sensor power).
Standard value: 3.5-6.5
kQ
(3) Connect a pointer type ohmmeter between terminal @
(sensor ground terminal) and terminal
@ (sensor output
terminal).
(4) Operate the throttle valve slowly from the idle position to the full open position and check that the resistanc
e
changes smoothly in proportion with the throttle valve
opening angle.
(5) If the resistance is out of specification, or fails to change smoothly, replace the throttle position sensor.
Throttle position sensor installation torque: 1.5-2.5 Nm (1.1-1.8
ft.lbs.)
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Page 203 of 1273
FUEL SYSTEM
CLOSED THROTTLE POSITION SWITCH
control -Idle speed control
motor connector
@ Component sideconnector
@ Harness sideconnector
II
ISC plunger
_---__
III*Throttle shaft turning angle
01209
2
-
Engine control module
1
6
3
OFF
aI
ON
-z
Closed throttleDosition switch
lFUO479
OPERATION
l
The closed throttle position switch functions to
convert (to HIGH/LOW-level voltage) data as to
whether the accelerator is depressed or
re-
leased, and to input that voltage (as signals) to
the engine control module. The engine control module, based upon those signals, regulates the
idle-speed control motor.
TROUBLESHOOTING HINTS
l Voltage within the engine control module is ap-
plied, by way of the resistance, to the closed
throttle position switch.
When the foot is taken off the accelerator, the
closed throttle position switch is switched ON,
so the current is grounded.
As a result, the closed throttle position switch
terminal voltage changes from HIGH to LOW
level.
If there is an abnormal condition of the closed throt-
tle position switch output even though the results
of the checking of the closed throttle position
switch harness and of the component itself indicate
a normal condition, the cause may be presumed tobe one of the following.
TSB Revision
(1) Improper adjustment of the accelerator cable or the automatic-cruise-control cable.
(2) Improper adjustment of the fixed SAS.
Page 205 of 1273
FUEL SYSTEM
CLOSED THROTTLE POSITION SWITCH
models>
Engine control module M13YKAfIdle speed control
motor (Closed throttle
position switch and
idle speed control
motor
cosition sensor)
Idle speed control/ plunger position
Throttle shaft -x-ring angle -
01209
2
Idle speed control motor
position sensor connector
/ c-~ IONrZ
i i ???FT%
;e
’T
A’,-
a
Closed throttleposition switch
/cmgso,l ,“,“,‘;a;;o;ide
6FU1245
OPERATION
TROUBLESHOOTING HINTS
INSPECTION-Using Scan tool
Refer to
P.13-61.
HARNESS INSPECTION
0I
I
@ Harness sideconnector
\
LI
6FU1246
6Fu12a
(2) Check the continuity between terminal @ and body
ground.
Accelerator pedal Continuity
Depressed Non-conductive
(ma)
IReleasedIConductive (0.
Q)1
(3) If out of specification,rep\ace the idle speed corm\ motor
7/assembly.
TSB Revision
Measure the power supply voltage of
the closed throttle position switch.
. Connector: Disconnected
. Ignition switch: ON
SENSOR INSPECTION/
(1) Disconnect the idle speed control motor position sensor connector.
I
II