check engine MITSUBISHI GALANT 1989 Service Repair Manual

FUEL SYSTEM -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)
250-270 kPa (36-38 psi)
(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
system I
TSB Revision

13-314FUEL SYSTEM -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.
TSB Revision1

FUEL SYSTEM -
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
TSB Revision

13-316FUEL SYSTEM -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 Engine: Soon after the warmed up engine isB+started (approx. 1 minute)
i9
Stepper motor0%
coil (Repeat the
variation.)
‘7Stepper motorcoil
8Stepper motorco11
TSB Revision

FUEL SYSTEM -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
TSR Revision-
-
‘i

FUEL SYSTEM - Fuel Tank 4WD>13-323
03AOllO03AOlll
f%? hose
‘F;el high pressure
-Fuelgaugeand \n pump assembly- 03AO107
TSB Revision
FUEL PUMP AND GAUGE ASSEMBLY REPLACE-
MENT
MlBGEAG
(1) Remove the protectors.
(2) Disconnect the fuel pump and gauge assembly harness connector, and then remove the hole cover.
(3) Bleed the remaining pressure from the fuel pipe line to prevent fuel discharge. (Refer to
P.13-312.)
(4) Disconnect fuel high pressure hose and remove the fuel
tank pressure control valve, then remove the fuel pumpand gauge assembly.
(5) Apply the specified sealant to the rear floor pan.
Specified sealant: 3M ATD Part No.8625 or equivalent
(6) After installing the fuel pump and gauge assembly, start the
engine and check to ensure that there is no fuel leakage.

FUEL SYSTEM - Fuel Line and Vapor Line 13-325
Mounting
bolts 03F008
I--l03FOO7Standard value: 20-25 mm (8-1.0 in.)
t&-----Eye bolt
Gasket
Fuel filter
#-----
Flare nut
;y;; main ------A\
J
I
-.
High-presfuel hose
J-ring

O”
SERVICE POINTS OF REMOVALMlSKBAMl
1. REMOVAL OF EYE BOLT
Remove the eye bolt while holding the fuel filter nut
securely.
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. REMOVAL OF FUEL FILTER (1) Loosen the main pipe flare nut while holding the fuelfilter nut securely.
(2) Remove the fuel filter mounting bolts, and then remove the fuel filter from the bracket.
INSPECTIONMlOKCABl
l Check the hose and pipes for cracks, bend, deformationand clogging.
lCheck the evaporative emission canister for clogging.
l Check the fuel filter for clogging and damage.
SERVICE POINTS OF INSTALLATIONMlJKDAPl
6. INSTALLATION OF FUEL VAPOR HOSE/4. FUEL RE-
TURN HOSE
(1) If the fuel pipe has a stepped part, connect the fuel
hose to the pipe securely, up to the stepped part, as
shown in the figure.
(2) If the fuel pipe does not have a stepped part, connect the fuel hose to the pipe securely, so that it is the
standard value.
3. INSTALLATION OF FUEL FILTER (1) When installing the fuel filter, first temporarily install thefilter to the filter bracket; then insert the main pipe at
the connector part of the filter, and manually screw in
the main pipe’s flare nut.
(2) Holding the fuel filter nut, tighten the fuel main pipe’s
flare nut and eye bolt at the specified torque. Then
tighten the filter to the bracket.
TSB Revision 2. INSTALLATION OF HIGH PRESSURE FUEL HOSE
Apply engine oil to the hose union.
Insert the hose, being careful not to damage the O-ring, and
tighten securely.
Caution
Because there is high pressure applied between the
fuel pump and the injection mixer, be especially sure
that there is no fuel leakage in this area.

ENGINE CONTROL - Service Adjustment Procedures13-329
SERVICE ADJUSTMENT PROCEDW,E,t&
ACCELERATOR CABLE INSPECTION AND
ADJUSTMENT
For models equipped with the auto-cruise control system, refer
to P. 13-398.
(1) Confirm there are no sharp bends in accelerator cable.
(2) On models with an SOHC engine, turn the ignition switch to the ON position (without starting the engine) and leave
in that condition for approximately 15 seconds.
(3) Loosen the adjusting bolts on the intake manifold plenum, and then secure the outer cable so that the free play of theinner cable will be the standard value.
Standard value:
>
1 - 2 mm (.04- .08
in.)
-a/T>3-5 mm (.12-.20 in.)
NOTE
If there is excessrve play of the accelerator cable, the
vehicle speed drop (“undershoot”) when climbing a slope will
be large.
If there is no play (excessive tension) of the accelerator
cable, the idling speed will increase.
(4) After adjusting, confirm that throttle valve fully opens and closes by operating pedal.
(5) Adjust accelerator cable play and confirm throttle lever
stopper touches the closed throttle position switch.
Stopper\CTP switch03AO278
A
.-\\‘\.\ ‘\
!4
:l/.\\ \\‘\ I\*\\”
j 07R0024
ACCELERATOR SWITCH INSPECTION AND
ADJUSTMENTM13FTBBa
(1) After warning up the engine, check to be sure that theaccelerator switch is ON when the accelerator pedal is in
the free condition. If there is a malfunction, adjust by using
the adjusting bolt.
(2) Press the accelerator pedal by hand until the accelerator switch switches from ON to OFF and confirm that the
amount of pedal movement (A in the figure) is within the
standard value range.
Standard value: Accelerator switch switching point
4-8 mm (.16-.31 in.)
(3) If the distance (A in the figure) is not within the standard value, adjust it by using the adjusting bolt.
I1 TSB Revision

ENGINE CONTROL - Engine Control13-331
4. APPLICATION OF GREASE TO ACCELERATOR ARM
SIDE INNER
CABLE/3. BUSHING
(1) Securely install the resin bushing of the accelerator
cable on the end of the accelerator arm.
(2) Apply multipurpose grease around the cable end.
INSPECTIONMl3ocAH
l Check the inner and outer cable for damage.
l Check the cable for smooth movement.
l Check the accelerator arm for bending.
l Check the return spring for deterioration.
l Check the connection of bushing to end metal fitting.
l Check the accelerator switch for ON/OFF switching.

SERVICE POINTS OF INSTALLATIONMlJODAW
8. APPLICATION OF SEALANT TO ACCELERATOR ARM
BRACKET
Apply the specified sealant to the bolt mounting hole, and
then tighten the accelerator arm bracket.
Specified sealant: 3M ART Part No.8663 or equivalent
TSB Revision

13-334AUTO-CRUISE CONTROL SYSTEM - Troubleshooting
TROUBLESHOOTIN
G
MlJEBDH

The auto-cruise control system performs control functions for
the setting or cancellation of the fixed-speed driving speed bas-
ed upon the data provided by input signals. As a result, when
the auto-cruise control system is canceled, the cause of the
cancellation is memorized in a separate circuit by the ECU,
regardless of whether or not the auto-cruise control system
condition is normal or abnormal, thus providing the ECU with
the on-board diagnostic function by certain fixed patterns, as
well as the function of being able to check whether or not the
ECU’s input switches or sensor are normal. Thus, by effectively
using these function, the time required checking and repair can
be shortened.
NOTE
When the computer (ECU) power supply (ignition switch andmain switch) is switched OF-F, the memorized diagnostic
trouble codes are erased, and so for this reason the power
supply must be left ON until the checking is completed.
TROUBLESHOOTING QUICK-REFERENCE CHART
when cancellation not wanted.
be set after an automatic cancellation. ECU: Electronic control unit
After the occurrence of the problem, wasYes. With the main switch ON and the engine
the ignition switch and main switch leftrunning, check the diagnostic trouble code.
ON?+ (P.13-361)
No
Can the auto-cruise control system be set
_r-l;
Yes
No (new normal)Check whether or not, then, the vehicle was driven on a
steep slope, or the SET and RESUME control switches
were operated simultaneously. (The cause is not clear
under the present circumstances.)
TSB RevisionI