1989 MITSUBISHI GALANT Service Repair Manual

FUEL SYSTEM - General Information13-3
FUEL SYSTEM
GENERAL INFORMATION
MFI SYSTEM DIAGRAM

*1 Oxygen sensor
*2
Volume air flow sensor *3
Intake air temperature
sensor *4
Engine coolant tempera-
ture sensor *5
Throttle position sensor *6
Closed throttle position
switch *7 Camshaft position sensor
*8
Crankshaft position sen-
sor
‘9 Idle
speed control motor
position sensor
*I 0 Barometric pressure sensor
l Ignition switch-ST
l Power supply
l Vehicle-speed sensor
l Air conditioning switch
l Park/neutral position
switch
l Power steering pressure switch
A/T: Vehicles with an automatic transaxle
()/ $%?i modul
e
Closed throttle Evaporative
position switch emission canister
ir-con.)/ \
10
Throttle position
temp. sensor Fuel tank
- =
Oxygen M13BA-
I
*I Injector~2 Idle speed control motort3 Evaporative emission
purge solenoid
l Fuel pump control
l Multiport fuelinjection relay
l A/C compresser clutch
relay
l Ignition timing control
l On-board diagnostic
output
l Check engine/mul-function indicator lamp
Fue
l
: -
I
pump
purge
solenolo Catalvtic
converter
\/ *4 Thermal vacu valve Vacuum hose color
G: Green
R: Re
d
B: Black
L: Light blue
Y: Yellow
dJJ/ U’Engine coolant temp. sensor
PCV: Positive Crankcase Ventilation
6FU1125
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13-4FUEL SYSTEM - General Information
*I Oxygen sensor
*2 Volume
air
flow sensor$3 Intake air temperature
sensor
*4 Engine coolant tempera-ture sensor
“5 Throttle position sensor‘6 Closed throttle position switch
*7 Camshaft position sensor*8 Crankshaft position sen-
sor
*9 Idle speed control motor position sensor “I 0
Barometric pressure
sensor
‘11 EGR temperature sensor
l Ignition switch-STl Power supply
l
Vehrcle-speed sensor
l Air conditioning switch
l Park/neutral position
switch
l Power steering pressure switchI13
Engrnecontrol module10
rl Injectort2 Idle speed control motorr3 Evaporative emission
purge solenoid
r4 EGR solenoidl Fuel pump control
(Multiport fuel
injection relay)
l A/C compresser clutchrelay0 Ignition timing control
l On-board diagnostic
output
l Check engine/muj-function indicator lamp
A/T: Vehicles
with an automatrc
transaxle
Closed throttleposition switch Evaporative
emission
/(For auto air-con.) can’ster
/ n
Vacuum hose
G: Green
R: Red
B: Black L: Light blue
Y: Yellow
erature sensor Air

filter
Fuel tank - =
Oxygen sensor
\ U /Eni coolant temp. sensor1FUO447
Crankshaft
position sensor
Camshaft
position
sensor
color
PCV: Posrtive
Crankcase
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FUEL SYSTEM - Specifications
SPECIFICATIONS
GENERAL SPECIFICATIONS
Items
Fuel
Tank capacity
Return system
Filter
Fuel pump
Type
Driven by
Throttle body Throttle bore
Throttle position sensor
Idle speed control motor
Closed throttle position switch
Idle speed control motor position sensor
Engine control module Identification
model No.


Sensors
Volume air flow sensor
Barometric pressure sensor
Intake air temperature sensor
Engine coolant temperature sensor
Oxygen sensor
Vehicle speed sensor
Park/neutral position switch
Camshaft position sensor
Crankshaft position sensor EGR temperature sensor
Power steering pressure switch
Actuators
Multiport fuel injection relay type
Injector type and number
Injector identification mark
Evaporative emission purge solenoid
EGR solenoid
Fuel pressure regulator Regulated pressure
NOTE*I: *2: >
*3: Specifications
dm3 (gal.) 60 (15.9)
Equipped
High pressure type
Electrical, in-tank type
Electric motor
mm (in.) 50 (1.9691 Variable resistor type
Electric motor
Contact type, within idle speed control motor
Variable resistor type E2T14473*‘,

E2T36273*2, E2T36278*3
E2T14472”. E2T36272*2, E2T36277*3
Karman vortex type
Semiconductor diffusion type
Thermistor type
Thermistor type
Zirconia type Reed switch type
Contact switch type
Photo interrupter type
Photo interrupter type
Thermistor type
Contact switch type
Contact switch typeElectromagnetic, 4
B21 OH*‘,*2,
N21 OH*3
ON/OFF type solenoid valve
Duty cycle type solenoid valve
kPa (psi) 335 (47.6)
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13-6
FUEL SYSTEM - Specifications
SERVICE SPECIFICATIONSMl3CE.
ItemsSpecifications
Basic ignition timing
5”?2”BTDC at curb idle
Curb idle speed rpm
7502 100Idle
speed when air conditioning is on rpm
-am-r>850 at neutral position
4A>700 at D range
Basic idle speed rpm
750+50
Throttle position sensor adjusting voltageV 0.48-0.52 at curb idl
e
Throttle position sensor resistance
k-2 3.5-6.
5
Idle speed control motor coil resistance
Q 5-35 [at 20°C (68”F)l
Idle
speed control motor position sensor resistance
M-2 4-
6
Intake air temperature sensor resistance kQ 2.7 [at
20°C (68”F)l
Engine coolant temperature sensor resistancekc2
20°C (68°F)2.5
80°C (176°F)0.3
Fuel pressurekPa (psi)
Vacuum hose disconnection
330-350 (47-50) at curb idle
Vacuum hose connection Approx. 270 (38) at curb idle
Injector coil resistance
R 13-16 [at 20°C (68”F)]
TORQUE SPECIFICATIONSMIICC-
Items
Oxygen sensor
Engine coolant temperature sensor
Throttle position sensor attaching screws Idle speed control motor attaching screws
Fuel rail mounting bolts
High-pressure fuel hose to fuel rail
Fuel pressure regulator to fuel rail
Throttle body mounting
bolts
Accelerator cable adjusting bolts
Fuel tank drain plug
Electrical fuel pump Screws
Bolt (at lower side)
Fuel unit mounting screws gauge
High pressure hose to electrical fuel pump
High pressure hose to fuel main pipe
Fuel main pipe to fuel filter
Eye bolt
Fuel filter mounting bolts
Fuel pipes clip attaching boltNmft.lbs.
40-5030-36
20-4015-29
1.5-2.5 1.1-1.8
2.5-4.51.8-3.3
IO-137-
9
4-6 3-4
7-11 5-8
15-22
11-16
4-
6
3-4
17-26 12-19
2-3 1.4-2.2
9-14
7-10
2-
3
1.4-2.2
30-4022-2
9
30-4022-29
30-4022-29
25-3
5
18-25
9-14
7-10
9-1
4
7-10
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FUEL SYSTEM VALVE>- Specifications/Special Tools13-7
SEALANTM13CE-
Items Specified sealant
Engine coolant temperature sensor threaded portion 3M
NUT locking
No.4171 or equivalent
SPECIAL TOOLS
Ml JDA-
Number
NameI Use
OPTIONAL: AVAI
OPTIONAL: AVAILABLE FROM O.T.C.
MB991 341 l z
NOTE
‘1: <1
989 models>l *:
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13-8
FUEL SYSTEM - Troubleshooting
TROUBLESHOOTING
EXPLANATION OF TROUBLESHOOTING PROCEDURESMlBEBAD
Effective troubleshooting procedures related to problems of the MFI
system are described below.
START
1. Confrrmatron of the mal-functron.
2. Read-out of the diag-
nostic trouble code.
I
I
3. Assumption of the prob-
able cause of the mal-
function, and deter-
mrnatron of theappropriate checkpoints.
4. Checking of the engine
control module’s inputand output signals.
6. Checking of the
MFIcomponent itself.
8. Confirmation that repair procedures have been
completed and thatreoccurrence has been
prevented.
I. Confirmation of the malfunction.lCause the malfunction to reoccur and check the details
of the malfunction and the conditions (engine condition,
driving conditions, etc.) when the malfunction reoccurs.
2.Read-out of the diagnostic trouble code.
lWhen the diagnostic trouble code is read out and the diagnostic trouble code is output, refer to the diagnos-
tic chart and repair the indicated location of the mal- function.
3.Assumption of the probable cause of the malfunction, and
determination of the appropriate check points.
lRefer to the “CHECK CHART CLASSIFIED BY PROB-
LEM SYMPTOMS” and confirm the sequence of check-
ing for the indicated malfunction.
4. Checking of the engine control module’s input and output signals.
0Using the scan tool or an oscilloscope, check the input
and output signals of the engine control module.
aIf the input and output signals are normal, sensor input/
actuator control can. be judged to be normal, so check
the input and output signals of the subsequent check point.
5.Checking of the MFI
component’s harness.lIf an abnormal condition of the input and output signals
of the engine control module is discovered, check, and
repair if necessary, the body harness of the
MFI com-
ponent.
lAfter making this repair, again check the input and out- put signals of the engine control module; if they are
normal, proceed to the checking of the input and out-
put signals of the subsequent check point.
6.Checking of the MFI
component itself.aIf the input and output signals of the engine control
module are abnormal even though the body harness is
normal, check the MFI component itself, and repair or
replace as necessary.
lAfter making this repair or replacement, again check
the input and output signals of the engine control mod-
ule; if they are normal, proceed to the checking of the
input and output signals of the subsequent check point.
7.Rechecking of the cause of the malfunction, and repair.lIf the input and output signals of the engine control
module are abnormal even though the harness check-
ing and the checking of the unit itself indicate that the
condition is normal, refer to the troubleshooting hints to recheck the probable cause, and then check other
groups and reapir as necessary.
8. Confirmation that repair procedures have been completed and that reoccurrence has been prevented.
lPerform a test to try to get the malfunction to reoccur,
and confirm that it does not.
aEliminate the true cause of the malfunction so as to
prevent its reoccurrence.
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FUEL SYSTEM - Troubleshooting
13-9
r
I Connector
6FU1216
EXPLANATION AND PRECAUTION RELATED TO
HARNESS CHECKING
l Connector symbols are described as seen from the end of
the terminal for the connector.
lThe abbreviation “B+”
used for the normal judgment value
when checking the voltage is the abbreviation for battery positive voltage.
Test harness
set (MB991348)
Jumper wire
&6FU1217
Harness <
LQ
Q,
6FUlZlBj
l
Be sure to use the special tool (test harness) when, for a
waterproof connector, checking while the circuit is conduc-
tive. If a probe is inserted from the harness side, the waterproof
capability will be lowered, thereby causing/corrosion, SO
never do so.
If there is no test harness compatible with the connector, it
is OK to use the test harness set (MB991348)
that can be
directly connected between terminals.
l When a connector is disconnected in order to check terminal voltage, etc., never insert a probe if the terminal to
be checked is a female pin, because the forceful insertion
of a probe will cause improper or incomplete contact.
l When checking for damaged or disconnected wiring of a
harness (open circuit) and if both ends of the harness are
unconnected, use a jumper wire to ground one end of the
harness, and then check for continuity between the other
end and ground. By doing this, you can check for damaged
or disconnected wiring
., and, if there is no continuity, the
harness should be repaired.
l When checking for a harness short-circuit (short-circuit to
ground), open one end of the harness and then check for
continuity between the other end and ground.
If there is continuity, the harness is short-circuited to
ground and should be repaired.
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13-10
FUEL SYSTEM - TroubleshootingTerminal
at sensor side
1\~“‘,““W,O,’ ‘\*N 4-cnDQ5a,, \llllf,,
c 3 c-11 ‘.<-!
( .[&
;%* \ g ~ &.$$~&%,;
0%: E
.Oj-,,
giI lOWI -,n
/ ~ ( ~~‘-~~~
-.mo .u. m,.0 - rj*> ;; Check engine/malfunction
indicator lamp68AOO93
l
If the voltage (power-supply voltage) supplied to a sensor
is not normal, repair the harness. If the voltage to the sensor is still not normal after the har-
ness has been repaired, repalce the engine control module
and check again.
W&K ENGINE/MALFUNCTION INDICATOR
Among the on-board diagnostic items, a check
engine/mal-
function indicator lamp comes on to notify the driver of the
emission control items when an irregurality is detected. However, when an irregular signal returns to normal
andthe
engine control module judges that it has returned to normal,
the check engine/malfunction indicator lamp goes out. Moreover, when the ignition switch is turned off, the light goes
out. Even if the ignition switch is turned on again, the light does not come on until the irregularity is detected.
Here, immediately after the ignition switch is turn on, the
check engine/malfunction indicator lamp is lit for 5 seconds to indicate that the check engine/malfunction indicator lamp op-
erates normally.
ITEMS INDICATED BY THE CHECK ENGINE/
MALFUNCTION INDICATOR LAMP
1 Enaine control module
IOxvaen sensorI
IVolume air flow sensorIIntake air temperature sensor
Throttle position sensor
Engine coolant temperature sensor
Idle speed control motor position sensor
Crankshaft position sensor
Camshaft position sensor
Barometric rxessure sensor
Injector
Fuel pump
EGR
CHECK ENGINE/MALFUNCTION INDICATOR LAMP
INSPECTION
(1) Check to be sure, when the ignition switch is set to the “ON” position, that the lamp illuminates for about five sec-onds and then switches OFF.
(2) If the lamp does not illuminate, check for damage or dis-
connection of the harness, or for a blown fuse or a failedlight bulb.
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