1989 MITSUBISHI GALANT Service Repair Manual

FUEL SYSTEM - Troubleshooting13-211
FAILSAFE/BACK-UP FUNCTIONS LIST
If trouble with any major sensor is detected by the on-board diagnostic,\
the vehicle will be kept in the safe
driving conditions-accdrding
to the preset control
logic.
Trouble item
Volume air flow
sensor Control content for trouble
(1) Fuel injection timing and ignition timing are determined according\
to the throttle positior
sensor (TPS) and engine revolution speed signal (crankshaft position \
sensor signal).
(2) The idle air control motor is fixed at the specified position, and\
the idle revolution speec
control is not executed.
Intake air
temperature sensor The control is executed with the suction air temperature regarded as
25’C (77°F).
Throttle positron
sensor (TPS)The fuel injection rate is not increased for acceleration according to t\
he throttle positionsensor signal.
Engine coolant
temperature sensor The control IS executed with the engine coolant temperature regarded as 80°C
(176°F).(Even if the sensor signal becomes normal again, the control is continu\
ed until the ignition
switch is turned off.)
Camshaft position
sensor (1) Simultaneous injection of fuel is executed for all cylinders.
(In this case, the No.
1 cylinder top dead center is not detected at all after the ignition
key is turned on.)
(2) Fuel is cut 4 seconds after trouble is detected. (In this case, the No. 1 cylinder top dead center IS not detected at all after the ignition
key is turned on.)
Barometric pressure
sensor The control is executed with the pressure regarded as 760
mmHg (30 in.Hg.).
Knocksensor
The ignition timing is retarded further from the normal state, and ignit\
ion is executed even
when knocking does not occur.
Ignition coil, ignition
power transistor unitFuel is cut in the cylinder where the ignition signal is abnormal.
Heated oxygen sensor Closed loop control of the air/fuel mixture ratio is not executed.
TSB RevisionREAD OUT OF DIAGNOSTIC TROUBLE CODE
Refer to
P.13-16.
CLEAR MEMORY OF DIAGNOSTIC TROUBLE
CODE
Refer to P.13-17.

13-212
FUEL SYSTEM - Troubleshooting
CHECK CHART CLASSIFIED BY PROBLEM SYMPTOMS Starting Idling

stability Driving
>
.c
zx .-
E
EE 2-80’
52FCheck
Itemsz gp ~ =
gif8e
5;ms00 a,L%a‘;E
2
F5i5 .-
5scp ‘-re,t2aDo’6%.fP .xz YPfbz 2 ‘5 uE22
%il= 5
8
8 8gzzg-c$z8
z
Power
supply
and
ignition switch-IGOnI
255
Engine
control
module power ground
@ [ZI
45
Fuel
pumpoI51oulolIioDloiIl258
Jolume
air

flow sensorcam@Ea@@l@EilO[41@ q 261
‘ntake
air

temperature sensor0OlEiiOEtl@ q 263
3arometric
pressure
sensor0@lB@El@ q 266
Fngine coolant temperature sensorEloiIlomoaol7loEloDO@ 268
Throttle
position
sensor
@[email protected]
Closed throttle
position
switch0[51@D@D0[[email protected]
Tamshaft position
sensorOrnOlsl@Elam277,27
Crankshaft
position
sensor@El@[email protected]
gnltion
switch-ST

olzl3oa77
anitlon switch-ST and park/neutral)os,t,on switch @ElODl@ 78
/ehlcle
speed
sensor
00
80
‘ower
steering
oil
pressure
switch081
w conditlonlng swtch andr/C compressor clutch relay0285
knock sensor:Turbo. Non-Turbo From 1992 models>@ q 287
ieated oxygen
sensor
@290.29
njectors
@,[Hl@lzl@lz3@,161@Di080151@El
295
die air
control
motor (stepper
motor)0[63@!zl@al0863298 gnition
coil

and ignition
power transistor 0 m@El @El@ a 302.30’ Evaporative emission
purge
solenoid
0
99
iGR
solenoid@LaOK3@II3101
uel
pressure
solenoid @@Ia@El 307
urbocharger waste gate contrololenoid oE!l
309
‘uel
pressureOD@l5l@D@D012100
312
0:
Warm
engine (Figures
inside
the 0 indicate the checking sequence.)a: Cold engine (Figures
inside
the q indicate
the checking
sequence.)
TSB Revision1

FUEL SYSTEM - Troubleshooting13-213
PROBLEM SYMPTOMS TABLE(FORYOUR
INFORMATION) Item
Symptom
Won’t start The starter IS used to crank the engine, but there is no combustron
withrn

tht(no inrtial combustion)
cylinders, and the engine won’t start.
p Starting problem There is combustion within the cylinders, but then the engine soon stalls.g
$$a combustion, then
5
(Starting takes a long Engine won’t start quickly.
time.)
Idling instability (Rough Engine speed doesn’t remain constant; changes du\
ring idling.idling)Usually, a judgment can be based upon the movement of the tachometer poi\
nter
and the vibration transmitted to the steering wheel, shift lever, body, \
etc. This i:>.ccalled rough idling.=
%zIncorrect idling speed The engine doesn’t Idle at the usual correct speed.
F
Improper
idling continui-
This non-continuity of idling includes the following elements.-0tY (I 1 Die out .._.__... The engine stalls when the foot is taken from the accelerator-Die out
pedal, regardless of whether the vehicle is moving or not.
Pass out(2) Pass out .._.... The engine stalls when the accelerator pedal is depressed 01while it is being used.
Hesitation
Sag
“Hesitation” is the delay in response1Hesitation
of the vehicle speed (engine rpm) thatNormal
occurs when the accelerator is
de-,--pressed in order to accelerate from\alnrtral-’‘** /the speed at which the vehicle is nowz accelerator,’ ’
traveling, or a temporary drop in vehi-8 pedal/*’
,’ ,’
cle speed (engine rpm) during such
acceleration. a
Serious hesitation is called “sag”.
4sAK
m depression .I’
1’
,’*;’ I(,
r-----
4’>
Time
IFUOZ23
Poor acceleration Poor acceleration is inability to obtain an acceleration corresponding t\
o the degree Of
throttle opening, even though acceleration is smooth, or the inability t\
o reach maximum speed.
F Stumbl
e
5
5
Engine rpm response is delayed when
the accelerator pedal is initially de-
pressed for acceleration from the
stopped condition.4
BNormal B
m Initiala acceleratorg pedal
I
’
-2
/#’
01 depression4t’>’ /Idling L’Stumble
IFUO224
ShockThe feeling of a comparatively large impact or vibration when the engine\
isaccelerated or decelerated.
SurgeThis is repeated surging ahead during constant speed travel or during va\
riable speed
travel.
KnockingA sharp sound like a hammer striking the cylinder walls during driving and which
adversely affects driving.
II1 TSB Revision1

13-214
FUEL SYSTEM - Troublesh’ooting
CIRCUIT DIAGRAM
< 1989 models>
SUB ILINK
A-08
"IBLE
3
1
:FFER
-
B
IA-______-_-_-------
C-08
8_______________--___---------------------
2-BW o
CONNECTOR
IK
X
35AC-H0528-NY-

-
TSB Revision
1

FUEL SYSTEM - Troubleshooting13-215
IGhSW1-
------
P
IONY (IGl)
2-BW
r
a,
r,
II
II
iI
II
It
$I I
III I
II
fII II I
II
II
ItI I
III I
-+I
IGNITION COIL
OR CIRCUITB-07
12El34
TO SPARK
PLUG
“2
I>
109 al ,5_4_---.
+
1
1
PASTOR
m
J
I:
I
c-09
r
m :
55------------------------------------.
N
4
7
3
J/B
7
3
TSB Revision

13216FUEL SYSTEM - Troubleshooting
CIRCUIT DIAGRAM (CONTINUED)
< 1989 models>
KTROLIGNITION POWER MFIUNIT TRANSISTORRELAY
,nr ,nrc n TD CT nv c!crw.fl\“l.I”mL c)I‘\ IAl””ULtll”JR"/\2
,PTAKB *,A VOLUkz! FLOWIBOR
1.25-R
LI: CRANKSHAFT1 POSITION SENSORg AND CAMSHAFT
. POSITION SENSORa
A-57
\//1 I,t“3"5"4 "6 "1‘$1 '"3*54
t5Gk3s 6mI
z3m1,
WI
wm=-i !QIIII1*I
z-l t
' I
- ____-- J,-----3 I
m
ENGINE
%%&TURE
A-55 m“‘3
1 “&a,. YYI..d”..73 nnLxD-C”OXYGEN SENSORCHECK CONNECTOR
B c-14KX35-AC-H052SA-NY
TSB Revision

FUEL SYSTEM - Troubleshooting13-217
1.25-R
d I11 58 5E--- -.
bb
vv---------_-------___---__-_--__---5-----------------------18
F
1212
sA-08-
8r^ 3
il F
>
I
%
ccl3lo ?B-14 -Al
L 71
Iv/(ENG) (DATA) I f.N I T I ON-.-- . .-.-.-...*-.IJHIH
LINK
IIMINCONNECTOR $flI;,S9MENTVVIVIYXTOR
C-18A-61FRONT SIDE
2 $klB-04
* @g
-e--POWER
STEERING
;;TqsJRE
gg$ssfiMERATURE
(VEHICLES FORCALIFORNIA)
TSB Revision

13-218
FUEL SYSTEM - Troubleshooting
CIRCUIT DIAGRAM (CONTINUED)
< 1989 models>
A-40
I@
aI3IC-36
J/B
r
@
101
MFIRELAY
I
i-l
EGK
x
SOLENOID(VHEICLES FOFCALIFORNIA)
2
r
631
ii!.?
53c-10 ,
V
I FUSIBLE LINl
A-07X r
Q
AUTO COMPRESSORCDNTROL UNIT s
52
218 C-23
G
..2DUAL,\
g;&#RE9~g,'~:yP"
A-21 OFb-‘;oN
~&~f~“‘”
@0ON:2100kPa
(299PS I )OFF:2700kPa(384PSl)
"I
F5
A-OSI
ss65iii
B-22~1 AIR" CONDITIONING
q@
XI ON:lOS'C(228'F2 OFF:115'C(239'k1
0365
YY
-IIMAGNETiC CLUTCHMFI CONTROL UNIT
KX35-AC-H05288-NY
TSB Revision