check engine MITSUBISHI GALANT 1989 Service Repair Manual
[x] Cancel search | Manufacturer: MITSUBISHI, Model Year: 1989, Model line: GALANT, Model: MITSUBISHI GALANT 1989Pages: 1273, PDF Size: 37.62 MB
Page 398 of 1273
HARNESS INSPECTION
Engine control
module harness
1-OlLO421
Measure the ignition switch terminal
input voltage.
. Engine control module connector:
Disconnected. Ignition swatch: ON
13-256FUEL SYSTEM
Repair theharness.
(Ignition
switch -
Ilrol) @ Harness side
connector
Measure the power supply voltage ofthe multioort fuel iniection relav.
. Connector: Disconnected
Voltage (V)
IBattery positive voltageI
Repair theharness.
(Batter-y-
@@I)
connector
Engine controlmodule harnessCheck for an open-circuit, or a short-circuit to ground, between the engine
control module and the multiport fuelinjection relay.
. Engine control module connec-tor: Disconnected. Multiport fuel injection relay con-nectar: DisconnectedRepair theharness. 7FUO467
alJ*:
k!ii
054 3 2
-
109
9 7 6 Engine control
module
harnessside connector
@ Harness sideconnector
Check for an open-circuit, or a short-circuit to ground, between the engine
control module and the multiport fuelinjection relay.
.
Multiport fuel injection relay con-nector: Disconnected
@--A
. Engine control module connec-tor: Disconnected Repair the-+ harness.
@@I~ El-@?J. 11071)
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Page 399 of 1273
FUEL SYSTEM
OlLO521
01
LO220
fx!l
.‘,~‘,_C;:i2J,‘:,
OlLO222
1J 7FUO470
1MULTIPORT FUEL INJECTION RELAY INSPECTION
(1) Remove the multiport fuel injection relay.
(2) Use jumper wires and connect
multiport fuel injection relay
terminal
@I to the battery 0 terminal and terminal @I to the
battery 0 terminal.
Caution
Be very careful when connecting the jumper wires because the relay will be damaged if a mistake is made
with the contact terminals.
(3) With battery
0 terminal jumper wire connected and dis-
connected, measure the voltage at multiport fuel injection
relay terminals @ and 0.
(4) Use jumper wires to connect multiport fuel injection relay
terminal
@I to the battery 0 terminal and terminal @ to the
battery 0 terminal.
(5) Disconnecting the jumper wire on the terminal 0 side of
the battery, check whether or not continuity exists across
terminals
@ and @ of the multiport fuel injection relay.
Continuity between terminals 0-0
(6) Use jumper wires and connect multiport fuel injection relay
terminal
@ to the battery 0 terminal and terminal 0 to the
battery 0 terminal.
(7) With the battery 0 terminal jumper wire connected and
disconnected, measure the voltage at multiport fuel injec-
tion relay terminal
0.
Jumper wireTerminal Voltage @
ConnectionBattery positive voltage
Not connected OV
(8) Replace the multiport fuel injection relay if faulty
ENGINE CONTROL MODULE POWER GRtXJNla
Refer to P.13-45.
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Page 400 of 1273
k.
13-258FUEL SYSTEM
FUEL PUMP Fuel pump
check terminal
-I--
-
Ignition switch
[r
Ignition switch [IGI @
Component side
connector @ Harness side
Iconnecto
r
Fuel pump connector
I
,- __ _ /OlAO488
-T
IComponent side
connector
@
h 56 @
Harness side
1
v y
connector
-NC-
lrll
0
1-z
Fuel pump checkA 13 terminal harness
side-1 connector
I Engine
control
module
connector
Engine control module
6FU1295
01 LO838
OPERATION
l
Activates the fuel pump during engine cranking
and while the engine is running.
l When the ignition switch is set to the START
position, the current flows, by way of the multi-
port fuel injection relay coil, from the ignition
switch to ground. As a result, the multiport fuel
injection relay switch is switched ON, and the
power for activation of the fuel pump is sup-
plied, by way of the multiport fuel injection relay
switch, from the battery to the fuel pump.
lWhile the engine is running, the engine control module switches ON the power transistor, after
which current flows to the multiport fuel injec-
tion relay coil, and the power for activation of
the fuel pump is supplied to the fuel pump.
lWhen the multiport fuel injection relay switch is
switched ON, battery voltage is also applied to
the engine control module, and so the engine
control module detects the fact that the power
for activation of the fuel pump is being supplied
to the fuel pump.
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Page 401 of 1273
FUEL SYSTEM
INSPECTION
Using Scan tool
Actuator test
Item No.
07
Actuation1 Inspection conditions 1 Descriotion1 Normal condition
Actuates fuel . Engine cranking
Hold the return hose Pulsation can be felt.pump, circu-. Fuel pump forcedbetween two fingerslating fuel.
activation so as to feel the
The inspectionpulsation of the flow-
should be conducted ing of fuel.
for both of the above
conditions. Listen to the pumpPump sound can be
sound at a place near
heard.the fuel tank.
iCTlON
TGrrW’-rTTrrrrrrrrrrrrrrrrrrri 1 SAL TCheck the fuel pump._---__. Apply battery voltage to the check-ing terminal and operate the pump.
@ Harnessconnector
connector 1
sideI_
Check the ground circuit of the fuel
m-m.Connector: Disconnected
Repair theharness.
if?%d
Check for continuity between the fuel
pump and the checking terminal.
Repair theharness.
CW-
Ml)
Check for continuity between the
checking terminal and the enginecontrol module, and between themultiport fuel Injection relay termi-nals.
* Multiport fuel injection relay con-nector: Disconnected- Engine control module connec-tor: Disconnected
- ;~-:edPumpconnector: Discon-
Repair theharness.
@O-00OIHl3)
1 TSB Revision
Page 402 of 1273
13-260FUEL SYSTEM
!5J
@ Harness srdeconnector
7FUO474
Harness srdc@ connector
Engine control
module harness
side connector
7FUO475
7FUO476
@Harness side
I7FllO477
Measure the power supply voltage ofthe multiport fuel injection relay ignition switch.
Connector: Disconnected
. Ignition switch: START
(@a whenchecked). Ignition switch: ON (@@ when
Check for an open-circuit, or a short-circuit, 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.
uziul-8)
Check for continuity, of the groundcircuit.
. Connector: Disconnected.
cl8
Repair theharness.
%ih,
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Check for an open-circuit, or a short-circuit to ground, between the multi-port fuel injection relay and the fuel
pump.- Multiport fuel injection relay con-nector: Disconnected
- nf;;;edw-wconnector: Discon-
MULTIPORT FUEL INJECTION RELAY IN
-
SPECTION
Refer to P. 13-257.
Page 404 of 1273
13-262FUEL SYSTEM
INSPECTION
Using Scan tool
1 Data 12reading
L
Data displayInspection conditions
Sensor de-. Engine coolanttection airtemperature: 85-95°Cvolume (fre-(185-205°F)quency) .Lights, cooling fan, elec-trical accessories: OFF. Transaxle: neutral (PJTmodels: “P” range)
Engine condition
Idling
2,000 rpm
Racing
Standard value 25-50
Hz
60-90 Hz
Frequency increases 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].
i
Regular waveform03AO203
HARNESS INSPECTION Using Oscilloscope
(1) Run the engine at idle speed.
(2) Connect the probe to the osilloscope
pick-up point as
shown in the circuit diagram, and check the wave form.
Measure the terminal voltage.
. Connector: Disconnected
. Ignition switch: ON
connectorOlMaa
Measure the power supply voltage.
. Connector: Disconnected
. Ignition switch: ON
Harness side
connectorthe multiport fueinjection relay.
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Page 405 of 1273
FUEL SYSTEM
Check for continuity of the ground
circuit of the VAF sensor.
. Connector: Disconnected
\--connector
4Harness side Check for continuity between the
en-3 air__.. --.. ..-gine control moduie and volumt
UIIflow sensor.Y---L1 A
. Engine control module connec-
tor: Disconnected- Volume air flow sensor connec-tor: Disconnected
kTOA
Repair theharness.
NliwHBl)
DlAO!XO
MlJYGAAlUTAKE AIR TEMPERATURE SENSORI
I
Temperature-Temperature1621008
sensor connector , Intake air temperature sensor
temperature sensor
I24
Intake air
@I Harness side
connector@I Harness side
.8.I
4Enginecontrol
module 5V
I1
6FU1298
Iv---I1 TSB Revision
Page 406 of 1273
13-264FUEL SYSTEM
OPERATION
l The intake air temperature sensor functions to
convert the temperature of the air (intaken to the
engine) to voltage, and to input that voltage (as
signals) to the eingine control module. The en-
gine control module, based upon those signals,
then corrects the amount of fuel injection, etc.
lThe 5V power supply within the engine control
module is supplied, by way of the resistance
within the unit, to the intake air temperature
sensor; it passes through the intake air temper-
ature sensor, which is a type of resistor, and is
grounded at the engine control module.
Note that the resistance of the intake air
temperaturesensor decreases when the
temperature of the intake air increases.
* The intake air temperature sensor terminal
voltage becomes higher when the resistance of
the intake air temperature sensor increases, and becomes lower when the resistance decreases.
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
Data reading Item No.
13
Data display
Sensor de-
tection
temperature
HARNESS INSPECTION
II
I
Check conditions
Ignition switch: ONOr, engine running
Intake air temp.At -20°C (-4°F)
At 0°C (32°F)
At 20°C (68°F)
At 40°C (104°F)
At 80°C (176°F)
Standard value -20°C
0°C
20°C
40°C
80°C
Measure the power supply voltage.
- Connector: Disconnected. Ignition switch: ON
j
/‘“:;~~~v’0OKLl2
Repair theharness.
Cm--a
oE!l-@)
Check for continuity of the glroundcircuit of the intake air temperaturesensor.
. Connector: Disconnected
I
sidevI I 1~ I
I
Harness fi
connector ‘-------i01A051.1
1 TSB Revision1
Page 408 of 1273
13-266FUEL SYSTEM
BAROMETRIC PRESSURE SENSORMl3VHPYPl
\ Volume air
Barometric
pressure
sensor
Output Voltage
/-4
3
2
1
v 0LzLBarometric pressure mmHg 760 ~~1551
EC1537
(
7
\
‘i
6!
I
I1(
5EL1600, L-@I Harness sideconnector@Harness sidernnn~rtnr131 11, I ’““, ,. Iv-.-.,\L4 ,\-5A17 h24
Fnnine 1Anv uI
Barometric pressure sensor
-“J -control
module
I
OllO537
Engine control module connector
01 LOB38
OPERATION
l The barometric-pressure sensor functions to
convert the barometric pressure to voltage, and
to input that voltage (as signals) to the engine
control module.
The engine control module, based upon those
signals, then corrects the amount of fuel injec-
tion, etc.
TROUBLESHOOTING HINTS Hini 1:
If there is a malfunction of the barometric-pressure
sensor,
driveability of the vehicle will become worse
particularly at high altitude.
lThe 5V power supply within the engine control
module is supplied to the barometric-pressure
sensor; it passes through the circuitry within the
sensor, and is grounded at the engine control
module.
lThe barometric-pressure sensor output voltage is sent to the engine control module in propor-
tion to the barometric pressure (absolute pres-
sure).
Hint 2:
If. during high-speed driving, there is a noticeable
sharp drop of the displayed pressure of the
barometric-pressure sensor, check for clogging of
the air cleaner.
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Page 409 of 1273
FUEL SYSTEM
INSPECTION
Using Scan tool
Function Item No.
Data display
Data reading
25Sensor detec-tion pressure
HARNESS INSPECTION
Check conditions1 Altitude1 Standard value
lanltion switch: ON1 At 0 m (0 ft.)LrnmmHq
At 600 m(1,969 ft.)710 mmHg
At 1,200 m660 mmHg(3,937 ft.)
At I:800
m610 mmHg
(5,906 ft.)
. Connector:Disconnected
Measure the power supply voltage Ofthe barometric pressure sensor.
connector
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-Engine controlmodule harness
side connector
6%
Check for an open-circuit, or a shqrt-circuit to ground, between the enginecontrol module and the barometricpressure sensor.
. Volume air flow sensor connec-tor: Disconnected@--/LA
- Engine control module connec-tor: Disconnected