MITSUBISHI GALANT 1989 Service Repair Manual

FUEL SYSTEM <DOHC> - Troubleshootina1 s-209
agnostic On-boardtroublediagnosticode No.item
Diagnostic content
Major causeRemarks (trouble
phenomenon, etc.)
13Intake air (1) The signal voltage of the
(1) The intake air temperature l Slightly impropertemperatu-intake air temperature
sensor is troubled.driveability*re sensorsensor is 4.5V or higher.(2) Open-circuit, short-circuit or l At high
(2) The signal voltage of the improper connector contacttemperatures,
intake air temperature occurs in the air intake
(a) Improper start*
sensor is
0.27V or lower. temperature sensor circuit. (b)Unstable
idling’
(3) The engine control module is
troubled.
14Throttle
position
sensor (1) The signal voltage of the
(1) The throttle position sensor is l Slightly improper
throttle position sensor is troubled or improperly acceleration
0.2V or lower.adjusted. <M/T
>
(2) Though the closed throttle (2) Open-circuit, short-circuit or l Improper
position switch is on, the improper connector contact driveability
signal voltage of the occurs in the throttle position
<A/T>throttle position sensor is
sensor circuit. l Engine stop2V or higher.
(3) The closed throttle position l Engine stop
switch ON is troubled.
(4) The closed throttle position l Racing is
switch signal line is impossible
short-circuited.
(5) The engine control module is
troubled.
21Engine(1) The signal voltage of the (1) The engine coolant During cold weather,
coolant engine coolant temperature sensor is troubled.
l Starting is
temperatu-temperature sensor is(2) Open-circuit, short-circuit or
impossible.*re sensor4.6V or higher.improper connector contact l Unstable idling*
(2) The signal voltage of the occurs in the engine coolant0 Improper
engine coolant temperature sensor circuit.
acceleration*
temperature sensor is (3) The engine control module is
0.1 1 V or lower.troubled.
‘(3) During engine warming-up, the engine
coolant temperature
sensor signal indicates
that the engine coolant
temperature drops.
22Crankshaft Though the engine is cranking (1) The crankshaft position sensor
l Engine s,tOp
position4 seconds or more, the signal is troubled.0 Starting Is
sensor
voltage of the crankshaft (2) Open-circuit, short-circuit or
impossible.
position sensor does not vary improper connector contact
(to be high/low). occurs in the crankshaft
position sensor circuit.
(3) The engine control module is
troubled.
23Camshaft Though the engine is running,
(1) The camshaft pOSitiOn
Sensor iSl Engine stoP*position the signal voltage of the troubled.
sensor camshaft position sensor does
(2) Open-circuit, short-circuit or
not vary (to be high/low). improper connector contact
occurs in the camshaft position
sensor circuit.
(3) The engine control module is
troubled.
24Vehiclespeed
sensor
(reed
switch) During acceleration of engine
(1) The vehicle speed sensor is The engine
revolution speed of 3,000 rpm troubled.sometimes cuts off
or more, the signal voltage of (2) Open-circuit, short-circuit or when stopping after
the vehicle speed sensor does improper connector contact
deceleration.
not vary (to be high/low). occurs in the vehicle speed
sensor circuit.
(3) The engine control module is
troubled.
II1 TSB RevisionI
c

13-210FUEL SYSTEM <DOHC> - Troubleshooting
Xaia;;;ic On-boarddiagnostic
code No.item Diagnostic content
Major causeRemarks
(troublephenomenon, etc
25Barometric
(1) The signal voltage of the (1) The barometric pressure sensor l Unstable idling*
pressure barometric pressure is troubled. l Improper
sensor sensor is
4.5V or higher.(2) Open-circuit, short-circuit or
acceleration*
(2) The signal voltage of the improper connector contact0 Improper start*
barometric pressure occurs in the barometric
sensor is
0.2V or lower. pressure sensor circuit.
(3) The engine control module is
troubled.
31Knocksensor Open-circuit in the knock
sensor circuit. (1) The knock sensor is troubled.
(2) Open-circuit, short-circuit or
improper connector contact
occurs in the knock sensor
circuit.
0 Improper acceleration*
(3) The engine control module is troubled.
41Injector Injector is not continuously
driven for 4 seconds during
engine cranking or idle
operation. (1) The injector is troubled.
(2) Open-circuit, short-circuit or
improper connector contact
occurs in the injector sensor
circuit.
(3) The engine control module is
troubled. l Unstable idling0 Improper
acceleration
0 Improper start
42Fuel pump The engine runs but power to (1) Open-circuit, short-circuit or
l Impossible start
drive the motor is not supplied improper connector contactl Engine stop
to the fuel pump. occurs in the fuel pump power
supply circuit.
(2) The
multiport fuel injection
relay is troubled.
(3) The engine control module is
troubled.
43
EGRDuring engine running after (1) The EGR valve is not opened. l Deterioration of<Califor-warming-up,
(2) The negative pressure of the exhaust gasnia>(1) The EGR amount is small.
EGR valve control is excessively purifying
(The signal voltage of the low. performance
EGR temperature sensor (3) The EGR solenoid
is troubled.
is excessively high.) (4) The EGR temperature sensor is
(2) The signal voltage of the troubled.
EGR temperature sensor (5) Open-circuit, short-circuit or
is 0.1 V or less.improper connector contact
occurs in the EGR temperature
sensor circuit.
(6) The engine control module
troubled.
44 Ignition
During engine running, the
(1) The ignition coil is troubled. l Unstable idling*
coil/ignitio-ignition signal is not input.
(2) Open-circuit, short-circuit or0 Impropern powerHowever, cases in which
improper connector contact acceleration*
transistor ignition signals are input to all
occurs in the igntion primaryl Improper start*
unit cylinders are excluded.
circuit.
(3) The ignition power transistor
unit is troubled.
(4) The engine control module is
troubled.
TSB Revision
1

FUEL SYSTEM <DOHC> - 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 <DOHC> - 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
@El@ix270.27
Closed throttle
position
switch0[51@D@D0[31@El274.27
Tamshaft position
sensorOrnOlsl@Elam277,27
Crankshaft
position
sensor@El@El@ElOD280.28
gnltion
switch-ST

<MIT>olzl3oa77
anitlon switch-ST and park/neutral)os,t,on switch <A/T>@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 <Turbo> @@Ia@El 307
urbocharger waste gate contrololenoid <Turbo>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 <DOHC> - 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 <DOHC> - 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 <DOHC> - 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 <DOHC> - 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 <DOHC> - 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 <DOHC> - 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