1989 MITSUBISHI GALANT sensor

13-178FUEL SYSTEM VALVE> - ::$%?=pection Of MF’
HARNESS INSPECTION
Harness stdeconnector
OlAOS22L
-j-J
Harness side
connector
SFUOOS:3
TCheck for continuity of the ground
circuit.
l EGR temperature sensor connec- tor: Disconnected
Check for an open circuit, or a short
circuit to ground between the engine
control module and the EGR tempera-
ture sensor.
bi- 03
l EGR temperature sensor connec-‘u’tor: Disconnected
l Engine control module connec- tor: DisconnectedRepair the
i-, harness.
j @El-H)
TSB Revision Measure the Impressed voltage.
l Connector: Disconnected
l Engine control module connec-
tor: Connected
l Ignition switch: ON
Voltage
(V)
4.3 - 4.7
1 Replac
e
A the engine
contro
l
module.
SENSOR INSPECTION Refer to GROUP 17
- Exhaust Gas Recirculation (EGR) System.

On-Vehicle Inspection of MFI
FUEL SYSTEM - Components13-179
OXYGEN SENSOR
\l-f
\
Oxygen sensor
J
q :
i’ 1%
Lkm uA6FUO6.5
2
8
.5
s.-EE?za,w
Theoretical A/F
14 1516
4/FEClW7
j5
Engine
control module
@ Equipment side
connector
iIxy;n se;‘i,G,
A56 h72
fhx 5v
@ Harness side
connector
9FUOO32
Engine control module connector
7FL0553
OPERATION
TROUBLESHOOTING HINTS
INSPECTION
Using Scan Tool Refer to
P.13-87.
HARNESS INSPECTION
Engine control
module harness ide connector
56
1’r YlFUO5%
Check for an open circuit, or a short
circuit to ground, between the engine
control module and the oxygen sen-
sor.
l Oxygen sensor connector: Discon-
nected
l Engine control module connec-
tor: Disconnected
cl OK+02
’ Repair the
A harness
( @El-@I)
TSB Revision

13-180FUEL SYSTEM - :::;:%?pection Of MF’
@ Harness sideconnectorCheck for continuity of the ground
Repair the
harness
(@lzl - El)
IlFUOS97 1I
L
G-lI’ ‘Ila
r rI L/I
IJ
lFUO598J
SENSOR INSPECTION
(I) Warm the engine and check to be sure that the engine
coolant temperature is
85-95°C (185-203°F).
(2) Disconnect the oxygen sensor connector and connect a
digital voltmeter.
Caution
When disconnecting the oxygen sensor connector, do
not pull the connector or lead wire too strongly.
(3)Race the engine repeatedly and measure the oxygen sensor
output voltage.
Engine Sensor output
voltage
Remark
When When the a/r/fuel
mixture
racing
the 0.6
- 1 .O Vratio is enriched by racing the
engine repeatedly, a normal
engine oxygen sensor will output a
voltage of 0.6
- 1 .OV.
(4) If the sensor is defective, replace the oxygen sensor.
NOTE
For removal and installation of the oxygen sensor, refer to
GROUP 15
- Exhaust Manifold.
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13-184
On-Vehicle Inspection of MFI
FUEL SYSTEM (SOHC-16 VALVE> - Components
IDLE AIR CONTROL MOTOR (DC MOTOR)
@ Harness sideconnectorI L
[@Ex@ziJ 1
5ELWOlJ
j
e;
j 55ww3 )A’,’/
@ Equipment sideconnector
Engine control module
Idle air control motor
6FU1734
Engine control module connector
7FUCJG3
OPERATION
lThe volume of intake air during engine idling is controlled by the opening and closing of the
IAC
valve for bypassing the throttle valve, located at
the air intake port.
lThe IAC valve opens and closes depending on
whether the DC motor inside the idle air control motor is turning clockwise or anti-clockwise.
l The DC motor turns clockwise or anti-clockwise
according to the change in the direction of cur-
rent in the motor drive
IC inside the engine con-
trol module. TROUBLESHOOTING HINTS
Hint 1: While the engine is idling, if the idle speed and
IAC valve position (step) change when
the air conditioning switch is turned to ON
and OFF, it can be assumed that the idle air
control motor and the
IAC valve position
sensor are operating normally.
Hint 2: If the
IAC valve position (step) is outside the
standard position, the malfunction is prob-
ably one of the following: (I)
Basic idle speed adjustment is wrong.
(2) Some deposit is adhering to the throttle
valve.
(3) Air is being drawn into the air intake
manifold through a defectivegasket seal.
(4) EGR valve sheet adhesion is defective.
(5) Combustion malfunction inside a cylin-
der.
(Spark plug, ignition coil, injector or
compression pressure is defective.)
TSB Revision

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
1 TSB Revision

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 (
1 TSB Revision

13-196FUEL SYSTEM - General Information
FUEL SYSTEM
GENERAL INFORMATION
MFI SYSTEM DIAGRAMMl
3BA-A

*1 Injector*2 Ignition coil
(Low-
voltage power-drs-
tribution type)
*3 Idle air control motork4 Evaporative emis-
sion purge solenoid l Fuel pump control (Multiport
fuel injec-
tion relay)
l Air conditioning
corm- pressor clutch relay
* Ignition timing control) On-board diagnostic
output
) Check engine/mal-
function indicator
lamp
Engine coolant tem-
perature sensor
l Ignition swatch STl Power supplyl Vehicle-speed sen-sor
. Arr conditioning
switch
l Power steering
pressure
swatch
‘I Heated oxygen sensor ‘10*2
Volume air flow sensor *3

Intake air temperaturesensor‘4 Throttle position sensor *5
Closed throttle position
swrtch *6
Camshaft position sen-
sor “7
Crankshaft position sen-
sor“8 Barometrrc pressure
sensor
‘9 Engine coolant temper-ature switch (for cooler
cut-off)
Evaporatrveemrssion canister
Evaporatrveemlsslo”Idle airThronlecontrol motorl 3 Fast idle air valveI (Wax tvoe)position\Volume air/sensor3flow sensorf \//n,r\l 2 '8
- lnnhnn toll III1 II
II-“,--?% 11 11 EGR,/alveI.l”lll)i
Fuel injectorII
II
Vacuum hose color
G: Green
L: Light blue
I?: RedY: Yellow5: Black
Heated oxygen sensor Thermal
vacuu
a uCatalytrc converter
HMO163PCV: Positive CrankcaseVentilation
TSB Revision