1989 MITSUBISHI GALANT Service Repair Manual

FUEL SYSTEM (SOHC-8 VALVE> - Troubleshooting13-27
INJECTOR&INJECTOR&INJECTOR&NJEC
--
!-B-20 -7
!OXYGE!!ENSOR I'(VEHICLES FORCALIFORNIA)
5v
-w-Qz-I-
-
^
_____---______-_- ---____--&vs-- -__---- T18
I1
>
,..
-----.2
15
12
I
----.58
8
I
1
IDLE SPEEDDATA LINKCONTROL MOTORCONNECTOR
59
cl-11
I
2
1
m
II
!II II1
ib -
I
' OXYGEN SENSOR'(VEHICLES FOR
FEDE89":;
i 63 i
TSB RevisionI

13-28
FUEL SYSTEM - Troubleshooting
CIRCUIT DIAGRAM
<1991,1992 models>
SUB FUSIBLE
LINK 8
-7
MFlRELAY
c-15
jERIGNITIONSWITCH(ST)
- l--
I____-------C-08
52
m3 C-24c:
cJM/T& A/T z
cb7CL/\s
ymKPUMP
:ONNECTOR
d
OFF
- ON34FF -ON
rI . .r
"2 "6\I \Icd3 5
Fcp yzgLA
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N 51.G11.s .Az
B
m-p___-----
i/T
I
i m
104 fyy$
4 2-BW
0
:, 2
t
D-26
143
X95-AC-H0534-NH
TSB Revision

FUEL SYSTEM - Troubleshooting
13-29
;NIr(IT
zis-N2-BW?I
I
1234 c-4:3 a7
7mlss7.3 -77
J/BGi>
I
@
101RIO
2‘c-39'0
5
77
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r
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r
AUTO COMPRESSORCONTROLUYIT ITqIf3Cl36
5
c:
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I
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12
C-23
1
IGNITIONCOIL
? A-07-2X i4
ON:235uPa
" A-21
l%M;“PaDUALOF:PRESSURESW1 TCH
2
rm
A-086
54
-.-----------.0355!j ,1165cd 4
pATTERY BACK UP )1
TSB Revision

13-30FUEL SYSTEM - Troubleshooting
CIRCUIT DIAGRAM (CONTINUED)
<1991,1992 models>
IGNITIONSWITCH(IG1)IGNITION POWERTRANSISTOR
FROL
91
\lxI
z;.
F
R
VOLUME AIR FLOW SENSORs
LYAYE
z m
1
rl
\I\I/ ,,I"3"5"4 "6 "1
E
stz
8
d
j,
Y4Y (
gj ~~p=q~ @
5v5v5v
) f $ T$z T T $5$ $GNI
CLOSED'
THROTTLE :;:/,fT
THROTTLE EGRPOSITION ;;;;!;TURE
@~#ON ~&~~~~ATUREsENSoRB-02-1(VEHICLESFOR
B-02
1 4-1RI
CALIFORNIA)
B-04 /@KX35-AC-HOSWA-NY
TSB Revision

FUEL SYSTEM - Troubleshooting13-31
MFIRELAY
IIOXYGEN SENSOR(VEHICLES FORCALIFORNIA)
g k______ -___----__ -------------
mlI
----518>
EF
!, -I
s A-08c-09
f@p&g~,,-yg@
POWER STEERINGPRESSURE SWITCH
.
---

-
1
3
14
--
-
3
1-
I
_------3
15
P
10
I [
12 t-----58
(ENG)
(DATA)
c-40-0

3
1
2
1
C-38
DATA LINKCONTROL MOTORCONNECTOR
' OXYGEN SENSOR'(VEHICLES FOR
1 TSB RevisionI

13-32
FUEL SYSTEM - Troubleshooting/Service Adjustment Procedures
FUEL TANK AND FUEL LINEMlBEAAA
Symptom Probable cause Remedy
Engtne malfunctions
Bent or kinked fuel pipe or hose Repair or replace3ue to insufficient fuel
SUPPlYClogged fuel pipe or hoseClean or replace
Clogged fuel filter or in-tank fuel filter Replace
Water in fuel filter Replace the fuel filter or clean the fuel tank
and fuel line
Dirty or rusted fuel tank interior Malfunctioning fuel pump
(Clogged filter in the pump) Clean or replace
Replace
Evaporative emission Mispiping of vapor line
Correct
control system malfunc-
tions (When fuel tank Disconnect vapor line piping joint Correct
filler tube cap is re- moved, pressure releas-
Folded, bent, cracked or clogged vapor line Replace
ng noise is heard) Faulty fuel tank filler tube cap
Malfunctioning fuel tank pressure control
valve Replace
Replace
LL
m ~~ : Paper clip-
F l!;“I /yFp- -
izd--_7-01
A0086SERVICE ADJUSTMENT PROCEDURES
CURB IDLE SPEED INSPECTION
MlBFHAFt
(1) The vehicle should be prepared as follows before the inspection.
lEngine coolant temperature: 85-95°C (185-203°F)
l Lights, electric cooling fan and accessories: OFF
l Transaxle: Neutral
(P for vehicles with an automatic
transaxle)
(2) Connect a tachometer or connect the scan tool to the data
link connector.
NOTE
Refer to
P.13-33 for information concerning connection Of
a tachometer.
(3) Set a timing light in position.
(4) Ground the terminal for adjustment of ignition timing.
(5) Start the engine and let it idle.
(6) Check whether or not the ignition timing is the standard
value; if not, adjust.
Standard value:
5”BTDC + 2”
(7) Stop grounding the terminal for adjustment of ignition timing. .
(8) Let the engine idle for two minutes.
(9) Check the idling rpm.
Curb idle speed:
7502 100 rpm
NOTE
The idling rpm is automatically regulated by the idle-speed control system.
1
TSB Revision

FUEL SYSTEM -Service Adjustment Procedures 13-33
For a female
pin
For a male pin
(insert at side (Insert at lock tab side.,
opposite from lock tab.)
OlLO246
(10)lf not within the standard value range, refer to the CHECK
CHART CLASSIFIED BY PROBLEM SYMPTOMS and check the
MFI component.
BASIC IDLE SPEED ADJUSTMENT
MlBFHBA
(1) The vehicle should be prepared as follows before the inspection and adjustment.
l Engine coolant temperature:
85-95°C (185-205°F)
l Lights, electric cooling fan and accessories: OFF
l Transaxle: Neutral
(P for vehicles with an automatic
transaxle)
(2) Slacken the accelerator cable enough.
(3) Connect the scan tool to the data link connector (white).
(4) If the scan tool is not used, follow the steps below.
@I Insert a paper clip (from the harness side) into the l-pin connector shown in the figure at the left.
Take care not to disconnect the connector.
Caution
The paper clip should be inserted between the
terminals as shown in the figure at the left., @ Connect a primary-voltage-detection type of tacho-
meter to the paper clip.
TSB Revision

13-34 FUEL SYSTEM -Service Adjustment Procedures
(5) Switch ON the ignition switch (but do not start the engine)and leave as if for 15 seconds or longer.
NOTE
When the ignition switch is switched ON, the idle speed
control plunger extends to the fast-idle opening degree,
and, after 15 seconds have passed, contracts to the initialposition and stops there.
Initial position: the suitable idling position at which the idle speed control motor position sensor output
voltage is
0.9V.
fi Idle-speed
--\\screw 6FU1404(6) Switch OFF the ignition switch.
(7) Disconnect the connector of the idle-speed control motor, and then secure the
ISC motor at the initial position.
(8) Sufficiently loosen the fixed SAS.
(9) Start the engine and let it idle.
(10)Check the basic idling speed.
If the scan tool is used, select
No.22 and then read the id-
ling speed.
Basic idling speed: 750
+-50 rpm
NOTE
The engine speed may be 20 to 100 rpm lower than
indicated above for a new vehicle [driven approximately
500 km (300 miles) or less], but no adjustment is necessary.If the engine stalls or the rpm is low even though the
vehicle has been driven approximately 500 km (300 miles) or more, it is probable that deposits are adhered to the
throttle valve, so clean it. (Refer to
P.13-35.)
(1l)lf there is a deviation from the standard value, turn the en-
gine speed adjustment screw to make the adjustment.
NOT
E
When the engine speed adjustment screw is turned to make the adjustment, use a hexagonal wrench if possible,
and, in order to prevent backlash of the screw, make the
final adjustment at the tightening side.
(12)Tighten the fixed SAS until the engine speed increases;
then return the fixed SAS to find the point (the “touch
point”) at which the engine speed does not decrease.
Then, from that point, return the fixed SAS and additional
one-half turn. (13)Switch
OFF the ignition switch.
1 TSB Revision