1989 MITSUBISHI GALANT Service Repair Manual

FUEL SYSTEM - :::;:it,t*?pec*ion Of MF’13-187
\
Normal waveform6FU1281
Oscillo 2
lOV-
ovII
Normal waveform
6FU1282
HARNESS
INSPECTION Using Oscilloscope
1. Primary signal of ignition coil
(1) Run the engine at an idle revolution speed.
(2) Connect the probe to oscilloscope pick-up point 1 as shown in the circuit diagram, and check the primary
signal of the ignition coil.
2. Control signal of power transistor
(I) Connect the probe to oscilloscope pick-up point 2 as
shown in the circuit diagram, and check the control
signal of the power transistor.
CI1
@ Harness side connector
Check for continuity between ignition
‘R/4(21 I@I Harness siclecoil and ignition switch [IGI.
connectorl Ignition switch [IGI connector:/,‘\0”
Disconnected1
4
l ignition coil connector: Discon-
nected
NOTE
Touch the circuit tester probes to
both ends of the harness.19FUOO54,/I
Repair the
harness
_A- h
Check for open-circuit, or short-circuit
to ground, between ignition power
transistor and engine control module.
l Ignition power transistor connec-
tor: Disconnected
l Engine control module connec-
tor: Disconnected
9FUOO37
Check for continuity of the ground cir-
cuit of an ignition power transistor.
0 Ignition power transistor connec-
tor: Disconnected lFUO649
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-i4
@Harness side
connector
/
Check to be sure that there is no
continuity between the ignition coil
and the earth.
l Ignition coil connector: Discon-
netted/ Check fo

r
short in the
ignition coil
primary
/ circuit
9FUOO38 1
13-188
On-Vehicle Inspection of MFI
FUEL SYSTEM
- Components
6
I
--
ml---X
A!
g@
0
T lFUO650
lgnltion
tlmlngadjustment
connector
E-:1
ll!?!
* 7FU1060
L
Measure the voltage of the control
signal circuit of the ignition power
transistor.
0 Ignition power transistor connec- tor: Disconnected
l Ignition switch: START
Voltage
(VI I
Measure the voltage of the ignrtion
timing adjustment terminal.
l Ignition switch: ON
Voltage
(VI
0 OKlIzI6
Repair the
harness
(@El - Ial
4.0 - 5.2
ACTUATOR INSPECTION Refer to GROUP 16
- Ignition System. Repair the
harness
(@El - 11041)
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On-Vehicle Inspection of MFI
FUEL SYSTEM (SOHC-16 VALVE> - Components13-189
EVAPORATIVE EMISSION PURGE SOLENOID
IEvaporative emission/
Multipomfuel
injection relay
Evaporative emission
purge solenoid
-cofxiectorVI@ Harness side connector
p
Q I:
1
@ Eauioment side
Engine !!!I module ki
J
5ELl205)
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Engine control module connector
OPERATION
INSPECTION
Using Scan Tool
Refer to
P.13-99.

13-190
On-Vehicle Inspection of MFI
FUEL SYSTEM
- Components
HARNESS INSPECTION
@ Multiport
connector ~
Harness sideCheck for continuity between evapo-
connector
~
rative emission purge solenoid andmultiport fuel injection relay.
l Evaporative emission purge sole- noid connector: Disconnected
I ~
l Multiport fuel injection relay con-
nector: Disconnected
1; NOT
E
Touch the circuit tester probes to
9FUOO39 !both ends of the harness.
Check for an open circuit, or a
short-
circuit to ground, between the evapo-
rative emission purge solenoid and
the engine control module.
Harness srdeconnector
l Evaporative emission purge sole-
noid connector: Disconnected
l Engine control module connec-
tor: Disconnected,I Repair th
e
* harness
@m-El)
I
ACTUATOR INSPECTION
Refer to GROUP 17
- Evaporative Emission Control System.
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FUEL SYSTEM - %i,,:::ti-pection Of MF’13-191
EGR SOLENOID
I
Engine
control module connector
Multiport fuel
injection relay
EGR solenoid
connector
\/ ‘
“
2
A6Engine
control
module
r-
w
7FlJOU3OlWIS7
OPERATION
TROUBLESHOOTING HINTS
INSPECTION
Using Scan Tool
Refer to P.13-101.
HARNESS INSPECTION
_11
I IIF5
connector
@I Harness sideconnector ul[ J
9FUOO53
Check for continuity between EGR
solenoid and
multiport fuel injection-!relay.
l EGR solenoid connector: Discon-
nettedw
l Multiport fuel injection relay
con-I
nectar:
Disconnected
NOTE
Touch the circuit tester probes to
both ends of the harness. 1
MI,
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On-Vehicle Inspection of MFI13-192FUEL SYSTEM (SOHC-16 VALVE> - Components
connector
Engine control
module
harness
Check for an open circuit, or a short-
circuit to ground, between the EGR
solenoid and the engine control mod-
ule.
l EGR solenoid connector: Discon- nected
l Engine control module connec- tor: Disconnected
0OK+ASTOP
,
wsL
Repair the
harness
mzl- El)
ACTUATOR INSPECTION
Refer to GROUP 17
- Exhaust Gas Recirculation (EGR) System.
FUEL PRESSURE TEST
Refer to
P.13-102.
INSPECTION OF ENGINE CONTROL MODUL
E
TERMINAL VOLTAGE
NOTE
Make the voltage measurement between terminal No.26
(ground terminal) and each terminal.
Refer to
P.13-105.
TERMINAL VOLTAGE CHECK CHART
Terminal arrangement of engine control module connector
7FUQ653NOTEB+: Battery positive voltage
Terminal ~
No
.
Check Item ~
Check Condition (Engine Condition)/ Standard
/ value
60j Backup power supply i Ignrtron: OFF
I-
-
,
12/ Power supplyI Ignrtion: ON
25
j
B+
B+
8
Multiport fuellgnrtion switch: ON ~
B+injection relay~ (Fuel pump)Enqine: Idle speedo-3v
61 ’Sensor impressed
Ignition switch: ONi 4.5-5.5v
voltage
70Volume air flow Engine: Idle speed/ 2.2-3.2Vj sensor
IEngine rpm: 2,000 rpm
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FUEL SYSTEM - i%$-%~pection Of MF’13-193
TerminaNo.
19
52
-rII
i
t
c
65
L
63
64t
I:
I
Check Item :Check Condition (Engrne Condrtron)
Volume air flowj Engine: Idle speedsensor reset signal
1
Engine rpm: 3,000 rpm
Intake air tempera-1Ignition switch: ON When Intake atr temperature IS 0°C (32°F)ture sensor
When intake air temperature IS 20°C (68°F)
i When intake air temperature is 40°C (104°F)
When intake air temperature is 80°C (176°F)
lgnltlon switch: ON’ When altitude is 0 m
When altitude is 1,200 m (3,937 ft.)
Ignition switch: ON
i When engine coolant temperature IS 0°C (32°F)
When engine coolant temperature is 20°C (68°F)
When engine coolant temperature is 40°C (104°F)
Barometnc pressuresensor
Engine coolant
temperature sensor
Throttle positionsensor
67
68
69
51
115
1
1
Ic22
Closed throttle
position switch
Camshaft position
sensor
Crankshaft position
sensor
Ignition switch-ST
Park/neutral position
switch
Vehicle speed sensor
Power steering
pressure switch
Air conditioning
switch
-I
I When engine coolant temperature is 80°C (176°F)
‘I
) 0.3-0.9v
Ignition switch: ON Set throttle valve to idle position.
0.3-0.6V
iFully open throttle valve.1 4.5-5.5v
Ignition switch: ON
Set throttle valve to idle position.o-1v
’ Slightly open throttle valve4V or more
Engine: Cranking0.2-3.OV
Engine: Idle speed
Engine: Cranking0.2-3.OV
Engine: Idle speed
Engine: Cranking8V or more
Ignition switch: ON
( SetselectorlevertoPorN.o-3v
i Set selector lever to D. 2, L or R.8-14V
Ignition switch: ONi 04d5v
Move the vehicle slowly forward.(Changesrepeatedly)
Engine. Idling after warmrng upSteering wheel idle stateB+
During steering wheel operationo-3v
Engine: Idle speed
’ Turn the air conditioning switch OFFo-3vI
’ Turn the air conditioning switch ON.1 B+(Air conditioning compressor is operating)!
Engine: Idle speed1 B+or
Air conditioning switch: OFF-ONI temporarily
Turn the conditioning switch ON. (Air conditioning compressor is operat\
ing) 1
6V or morej 1
1 o-3v
/ Standard
value
/ o-1v
1 6-9V
1 3.2-3.8V
: 2.3-2.9v
1.5-2.1V
i 0.4-I .ov
j 3.7-4.3v
/ 3.2-3.8V
, 3.2-3.8V
1, 2.3-2.9v
1.3-l .9vI
Air conditioningcompressor clutchrelay
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13-194FUEL SYSTEM VALVE> - ::~;:%~specion Of MF’
7-
i
TermrnalI
No. ,Check Ite
m
,Check Condrtion (Engine Condition)Standard
value
OttO.8V(Changesrepeatedly)
TFrom 1 l-14v.momen-
tarily drops
slightly
B+
o-1v
4.0-5.5v
o-3v19-13v
(After
several
seconds
have
elapsed)
B+
‘rom B+nomentarlly dropIS
I
56 1 Oxygen sensoriEngine: Running at 2,000 rpm after havrng warmed up. (Check using a
I ~
drgltal type voltmeter.)
3.6-4.4
V 2.2-3.OV
1.5-4v
(Momen-
tarily)
O-l V or 4.55.5v
1.5-4v
(Momen-
tarily)1D-IV or4.5-5.5v
2V or moreIMomen-tarily)LI-1 v
4V or moreMomen-:arily)1 I-1v
No. 1 Injector
No. 2 Injector
’ While engine is Idling after having warmed up, suddenly depress the
accelerator pedal.
1
14
2No. 3 Injector
15No. 4 Injector
Ignition power transistor unit~
Engine rpm: 3,000 rpm___-
Evaporative emission Ignition swatch: ON
purge solenoid
Runnrng at 3,000 rpm while engine is warmrng up after having beeni started.I
10II-
9
104Ignition timing
adjustment terminallgnttion switch: ON1 Earth the ignition trming adjustment terminal
I Remove the earth connection from the ignition
timing adjustment terminal.
CheckAir conditioning switch: OFF-ON
engine/malfunction
indicator lamp i
106
6
EGR solenoidlgnrtion switch: O
N
; Engine IS idling after having warmed up/j
EGR temperaturesensor
Ignition switch: ON
When the sensor temperature is
50°C (122°F).
When the sensor temperature is 180°C (212°F).
I 1I AC valve positlonsensor No.1Ignition switch: Immediately after turnrng ON5
18
AC valve position
sensor No.2lgnltion switch: lmmedlately after turning ON
dle air control motorclosed)Ignition switch: Immediately after turning ON
3le air control motor wen)lgnitlon switch:
Immediately after turning ON1
( t
i (
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