MITSUBISHI GALANT 1989 Service Repair Manual

FUEL SYSTEM <DOHC> -On-Vehicle
Inspection
of
MFI Components13-309
ACTUATOR INSPECTION
Operation inspection
NOTE
When removing the vacuum hose, make a mark so that it can
later be installed in the original connecting position.
(1) Remove the vacuum hose (blue stripe, black) from the solenoid valve.
(2) Cut off the harness connector.
(3) Apply a negative pressure in the nipple to which the black vacuum hose is connected with a hand vacuum pump and
check that it is airtight when voltage is applied to the
solenoid valve terminal and when not applied.
Battery Other solenoid Normal conditionvoltagevalve nipple
Not applied OpenVacuum leaks.
Closed by fingerVacuum is maintained.
Applied
OpenVacuum is maintained.
Inspection of coil resistance
Measure coil resistance with a tester.
Standard value: 36-46
S2 [at 20°C (68”F)I
TURBOCHARGER WASTE GATE SOLENOID <Turbo>
Multiport fuelinjection relay
@Component side,,2
connector/\
1
lE?l283
@J Harness side\/
connector“1
II
Engine control module connector
MlJZABA
Turbocharger wastegate solenoid
Engine
control
1module105
1
OlLo8381I
0110324
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13-310FUEL SYSTEM <DOHC>- On-Vehicle Inspection
of MFI Components
OPERATION
lThe turbocharger waste gate solenoid is an ON-tion relay. When the engine control
module
OFF type solenoid valve and controls the leaking turns on the power transistor inside
the unit,
of overboost pressure that is fed to the
turbo-current flows to the coil and some overboost
charger waste gate actuator. pressure that is fed to the turbocharger waste
l Battery power is supplied to the turbocharger gate solenoid leaks out.
waste gate solenoid via the
multiport fuel injec-
TROUBLESHOOTING HINTS
Since the results of the inspection of the turbo-
charger waste gate solenoid harness and single
parts are normal, the following troubles can be in-
ferred if there is some trouble such as poor accele-
ration, etc.
(1) Malfunction of the overboost pressure control system
(2) Poor intake air hose connection
(3) Malfunction of turbo charger, turbocharger waste gate solenoid
(4) Clogging of exhaust gas system
INSPECTION
Using Scan tool
Function Item No.
Actuator test 12
Description Inspection conditionsNormal condition
Sp:$r?,oi$;;alve switched from
ignition switch: ONOperating sound is
heard when driven.
HARNESS INSPECTION
Harness sideconnector
1
@
uI 6FU1305
Engine
control
module
harness
side
connector
105
JP--r6FUO973
Measure the power supply voltage.
9
1 Battery positivevoltage ]c)ll< f k&f$i
Check for an open-circuit, or short-circuit to around, between the turbn-charger w’aste g&e solenoid and thkengine control module.
* Turbocharger waste gate solenoid
connector: Disconnected
* Engine control module connec-tor: DisconnectedRepair theharness.
C@O--rn)
ACTUATOR INSPECTION
Refer to GROUP 15.
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FUEL SYSTEM <DOHC> -
On-Vehicle
Inspection
of MFI
Components13-311
BOOST METER <Turbo>
meter/
Ignition switch (IG,)I
M13ZACA
Boost meter
Engine control module connector OlLO838
A6FU1552
HARNESS INSPECTION
@ Harness sideconnector
6FU1550
Engine
control module
harness
side
connectc
ii+7 =6FU1551
Measure the power supply voltage.
. Connector: Disconnected. Ignition switch: ON
Voltage (VI
1Battery positive voltage 1
cl2
Repair theharness.
@~,“”
Check for an open-circuit or a short-circuit to ground, between the enginecontrol module and the boost meter.
* Booste meter connector: Discon-nected* Engine control module connec-tor: Disconnected
4.ASTOP
i+
Repair theharness.
vAlB-[33)

13-312FUEL SYSTEM <DOHC>- On-Vehicle Inspection
of
MFI
Components
FUEL PRESSURE TESTMxwXAAe
(1) Reduce the internal pressure of the fuel pipes and hoses.
(2) Disconnect the fuel high pressure hose at the fuel rail side.
Caution
Cover the hose connection with rags to prevent splash
of fuel that could be caused by some residual pressure
in the fuel pipe line.
(3) Remove the throttle body stay.
(4) Place the MD998742-01
adapter on the end of the fuel rail,
then attach the fuel high pressure hose to the adapter
using the bolts supplied with the MIT210196
fuel pressure
test assembly.
(5) Attach one end of the fuel hose supplied with the
MIT21 0196 to the quick-disconnect fitting on the
MD998742-01 adapter. Attach the other end of the hose
to the fuel pressure gauge.
(6) Connect the (-) battery terminal.
(7) Connect a jumper wire to the terminal for activation of the fuel pump and to the positive
(+) terminal of the battery to
activate the fuel pump. With fuel pressure applied, check to
be sure that there is no fuel leakage from the fuel pressure
gauge and the special tool connection part.
(8) Disconnect the jumper wire (from the terminal for activa-
tion of the fuel pump) to stop the fuel pump.
(9) Start the engine and let it idle. (10)Measure
the fuel pressure during idling.
Standard value:
Approx. 270 kPa (38 psi) <Non-Turbo>
Approx. 190
kPa (27 psi) <Turbo>
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FUEL SYSTEM <DOHC> -On-Vehicle Inspection
of MFI
Components13-313
(11)Disconnect
the vacuum hose from the fuel pressure
regulator, and then measure the fuel pressure while using a
finger to plug the end of the hose.
Standard value:
330-350 kPa (47-50 psi) <Non-Turbo>
250-270 kPa (36-38 psi) <Turbo>
(12)Check to be sure that the fuel pressure during idling does
not decrease even after the engine is raced a few times.
(13)Use a finger to gently press the fuel return hose while
repeatedly racing the engine, and check to be sure that
there is fuel pressure in the return hose also.
NOTE
There will be no fuel pressure in the return hose if there is insufficient fuel flow.
(14)lf the fuel pressure measured in steps (IO) to (13) deviates
from the standard value range, check for the probable cause by referring to the table below, and then make the
appropriate repair.
Condition Probable causeRemedy
. Fuel pressure is too low.
Fuel filter is clogged.Replace the fuel filter.. Fuel pressure drops during racing... No fuel pressure in fuel return hose.Malfunction of the valve seat with-Replace the fuel pressure regula-in the fuel pressure regulator, ortor.fuel leakage to return side causedby spring deterioration.
Fuel pump low discharge pressure.Replace the fuel pump.
Fuel pressure is too high.
The valve within the fuel pressureReplace the fuel pressure regula-regulator is sticking. tor.
Clogging of the fuel return hose
Clean or replace the hose and/orand/or the pipe.pipe.
No change of the fuel pressure when Damaged vacuum hose or nippleReplace the vacuum hose, or clean
vacuum hose is connected and when not clogging.the nipple.connected.
IMalfunction of the fuel pressureChecking the fuel pressure controlcontrol system <Turbo>
system <Turbo>I
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13-314FUEL SYSTEM <DOHC> -On-Vehicle Inspection
of
MFI
Components
(15)Stop the engine and check for a change of the value
indicated by the fuel pressure gauge. The condition is
normal if there is no decrease of the indicated value within
two minutes.
If there is a decrease of the indicated value, monitor the
speed of the decrease, and, referring to the table below,
determine the cause of the problem and make the
appropriate repair.
ConditionProbable causeRemedy
After the engine is stopped, the fuel injector leakage pressure drops graudally.Replace the injector.
Leakage at the fuel pressure reg-ulator valve seat Replace the fuel pressure regula-tor.
There is a sudden sharp drop of the fuel
pressure immediately after the engine isThe check valve (within the fuel pump) is not closed.Replace the fuel pump.
stopped.
(16) Reduce the internal pressure of the fuel pipes and hoses.
(Refer to P. 13-l 02.)
(17) Disconnect the fuel pressure gauge and the special tools
from the fuel rail.
Caution
Because there will be a some residual pressure in the
fuel pipe line, use a shop towel to cover so that fuel
doesn’t splatter.
(18)Replace the O-ring at the end of the fuel high-pressure
hose with a new one. (19)After
connecting the fuel high-pressure hose to the fuel
rail, tighten the installation bolt.
(20)Check to be sure that there is no fuel leakage. @ Apply battery voltage to the terminal for activation of
@
the fuel pump so as to activate the fuel pump.
With fuel pressure applied, check for leakage of the fuel
line.
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FUEL SYSTEM <DOHC> -
On-Vehicle
Inwection of MFI
ComDonents13-315
INSPECTION OF ENGINE CONTROL MODULE
TERMINAL VOLTAGEM13zALCa
Refer to P.13-105.
TERMINAL VOLTAGE CHECK CHART
Terminal arrangement of engine control module connector
l!m n-J-J-l-II
NOTE:B+: Battery
positive voltage
TerminalCheck item Check condition (Engine state)Standardvalu
e
Remarks
No.
103
102
107
Backup power
SUPPlY
Power supply
Ignition switch: OFFB+
Ignition switch: ONB+
110
13
63
66 56
23
Ignition switch-IGIgnition switch: ON
Fuel pump Engine: Cranking
drive signal Engine: Idling
Multiport fuel Ignition switch: OFFinjection relay
(Power supply)Ignition switch: ON
Multiport fuel Ignition switch: ON
injection relay
(Fuel pump) Engine: Idling
Sensor impressed Ignition switch: ONvoltage
B+
8V or higher
B+
B+
o-3v
B+
o-3v
4.5- 5.w
10
8
16
20
Volume air flowsensor
Ax intaketemperature
sensor
Barometric
pressure sensor
Engine coolant
temperature sensor Engine: Idling
2.2-3.2V
Engine speed: 2,000 rpm
IgnitionAir Intake temperature of 0°C (32°F)3.2- 3.8V
switch:
ONAir intake temperature of 20°C (68°F)2.3- 2.9V
Air intake temperature of 40°C (104°F) 1.5-2.1V
Air intake temperature of 80°C (176°F)0.4- 1 .OV
Ignition Altitude of 0 m (0 ft.)3.7-4.3v
switch
:
ONAltitude of 1,200 m (3,937 ft.)3.2-3.8V
IgnitionCoolant temperature of 0°C (32’F)3.2-
3.Wswitch:ONCoolant temperature of 20°C (68°F)2.3- 2.9V
Coolant temperature of 40°C (104°F)1.3- 1.9V
Coolant temperature of 80°C (176°F) 0.3-0.9V
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13-316FUEL SYSTEM <DOHC> -On-Vehicle
Inspection
of
MFI
Components
TerminalNo.Check itemCheck condition (Engine state)Standardvalue
Remarks
19Throttle positronIgnition switch: ItSet the throttle valve to the0.4- 0.wsensorIS kept ON for 15seconds or moreidlrng position.
Fully open the throttle valve.4.5- 5.5v
14
Closed throttlelgnrtrono-1vposition switchswitch:Set the throttle valve to the idling
position.
ONSlightly open the throttle valve.4V or higher
22Camshaft posi-tion sensorEngine: Cranking0.2- 3.ov
Engine: ldlrng
21
Crankshfat posi-tion sensor Engine: Cranking0.2- 3.ov
Engine: Idling
108lgnrtion switch-STEngine: Cranking8V or higher
104
Park/neutral
pos-ition switchIgnitionSet the selector lever to P or N.o-3vswitch:ONSet the selector lever to D, 2, L or R.8- 14V
18Vehicle speedl Ignition switch: ON
sensorl Slowly run the vehicle forward0 - 5v(Repeat the
variation.)
5Power steering
pressure switchEngine:Idling opera-Steering wheel idle stateB+
tion afterwarming-upDuring steering wheel operationo-3v
7A&;;;ditioningEngine:Idling _Turn OFF the air conditioning switch.o-3v
Turn ON the air conditioning switch.B+
(The air conditioning compressor is in
the drive state.)
35Air conditioningl Engine: IdlingB+ orcompressor
clutch relayl Air conditioning switch: OFF -, ON(The air conditioning compressor is in the
temporarily
drive state.)6V or higher o’-
3v
1Heated oxygen
sensorEngine: Keep the engrne speed at 2.000 rpmafter warming up.
(For checking, use a digital voltmeter.)ke;atoZivariation.)
51No. 1 InjectorEngine: After warming up, rapidly press the
52No. 2 Injector accelerator pedal from the idlrng state,Voltage
temporarily
drops slightly
30No. 3 Injectorfrom 14V to1 IV.
51No. 4 Injector
j8
Stepper motorcoil <Al>Engine: Soon after the warmed up engine isB+started (approx. 1 minute)
i9
Stepper motor0%
coil <A2>(Repeat the
variation.)
‘7Stepper motorcoil <Bl>
8Stepper motorco11 <B2>
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FUEL SYSTEM <DOHC> -On-Vehicle
Inspection
of MFI
Components13-317
TerminalNo.
54
55
62
57
105
I
01
2
i
E
Check item
Ignition power
transistor unit Check
condition (Engine state)
Engine speed:
3.000 rpm
Standardvalue
0.3- 3v
Remarks
Evaporativeemission purgeIgnition switch: ONB+
solenoidKeep the engrne speed at 3.000 rpm after thewarmed-up engine is started,o-3v
Fuel pressure
solenoidlgnltlon switch: ON
Engine:
Cranking - Idling(Within approx. 2 seconds)
B+
o- 3v1
B+
TurbochargerNaste gate sole-Ignition switch: ONB+ ioid
Engine: Idling (When premrum gasoline IS used.)0-3~
3oost meter
Ignition switch: ON4-13v
Engine: After warming up, rapldly press theaccelerator pedal from the idling state It temporarily
drops-slightlyIfrom B+.
Engine ignrtlonslgnalEngine: 3,000 rpm0.3-3v
lgnrtion timingadjustment
terminalIgnition Ground the ignition timing adjustment 0- 1Vswitch:terminal.ONRelease the ground of the ignition4.0- 5.5vtiming adjustment terminal.
Check engine/
malfunction indi- Ignition switch: OFF - ONo-3v
cator lamp9’- 13v(After several
minutes have
elapsed)
EGR solenoidIgnition switch: ONB+
Engine: After warming up, rapidly press theaccelerator pedal from the idling state. It temporarilydrops slightly
from B+.
EGR temperatureIgnitionSensor temperature of 50°C (122’F)3.6- 4.4V
rSt?MX
I
swlrcrl:nhir--.%?nY/V-_. ..sof temperature of 100°C (21.20~)2.2-3.0~
Engine: Idling operation after warming
UP
o-3v
B+
Engine &ed: 5.000 rPmB+
\ Anti-lock braking
signal
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‘i

13-318FUEL SYSTEM <DOHC> - Fuel Tank <FWD>
FUEL TANK <FWD>MIBGA-AREMOVAL
AND INSTALLATION
<up to 1990 models>
<From 1991 models>
3
Removal steps 03A0284
1. Fuel tank filler tube cap2. Drain plugl + 3. Return hosel +
4. Vapor hose
5. Fuel gauge unit connector
6. Electrical fuel pump connector
l 47. High pressure hose to fuel pumpconnectionI)+ 8. Filler hose~1Weasuerment of Fuel PressureH 9. Vapor hose+4 10. Self-locking nut1 I. Tank band stay12. Tank band
13. Fuel tank
I)+ 14. Vapor hose
l + 15. Fuel tank pressure control valveCaution
16. Fuel gauge unitWhen disconnecting the high pressure fuel hose, cover
17. Electrical fuel pumpthe hose connection with rags to prevent splash of fuel
18. Fuel tank filler tube that could be caused by some residual pressure in thefuel pipe line.
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