check engine MITSUBISHI GALANT 1989 Service Repair Manual

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.
TSB Revision

13-182FUEL SYSTEM - ~~~;~~~t~pection Of MF’
INSPECTION
Using Scan Tool
Function1 Item
No. ’Data display 1Check conditionI Coolant temperature Standard value
IData reading / 41Drive trme
*’ 1Engine: Cranking0°C (32°F) *2Approx. 20 ms
j: 20°C (68°F)Approx. 40 ms 80°C
(176°F)/ Approx. 9.8 ms
Data reading
NOTE Item
No.
41 i
Data display 1
Check condition
IEngine state 1Standard value
Drive time
*3l Engine coolant temperature: 85 to
95°C (185 to 203°F)
l Lights, electric cooling fan, accesso-ries: OFF
l Transaxle: Neutral
(P range for AIT) Idle
speed
1 2.2-3.4 ms
*‘:The injector drive time refers to when the supply voltage is 11 V and the cranking speed is less than 250 rpm.
*2:When engine coolant temperature is lower than 0°C (32°F). injection is made by four cylinders simultaneously.
*3:When the vehicle is new [within initial operation of about 500 km (300 miles)], the injector drive time may be about
10% longer
Function Item No
.
Drive content Check condition Normal state
Actuator test
01No. 1 injector shut off Engine: Idling afterI Idle state to change further
0
2
No. 2 injector shut off
- warm-up
(becoming less stable or
(Shut off the injectors in stalling)
03li No. 3 injector shut off sequence during after-engine warm-up, check1
I04No. 4 injector shut off
the idling condition)
-k
Imp
4 AL A: Inje,t,r--m--m-Normal waveformdrive time03*0209
(1) Run the engine at idle speed.
(2) Connect the probe to the oscilloscope pick-up point as
shown in the circuit diagram, and check the waveform at
the drive side of each injector.
1
TSB Revision 1
Using Oscilloscope

FUEL SYSTEM - ~:$%:t?on Of MF’13-183
HARNESS INSPECTION
@ Multiport fuelinjection relayharness side
connector
,\---L
Ell---l0
!I?
pJ”
D
Harness
side
connector
6FU1779
@@@03Harness side
connector
1
Pmodule harness
side connector
=lFUO643
ACTUATOR INSPECTION
Refer to
P.13-92.
r I
I-
T
L
Check for continuity between injector
and
multiport fuel injection relay.
l lniector connector: Disconnected
l
tviultiport fuel injection relay con-
nector: Disconnected
NOTE
Touch the circuit tester probes to both
ends of the harness. Repair the
harnessCm
- 0@3,
Check for an open circuit, or a short
circuit to ground between the engine
control module and the injector.
l Engine control module connec-
tor: Disconnected
l Injector connector: Disconnected
TSB Revision
I

FUEL SYSTEM - :,%,,k%$spection Of MF’13-1g5
HARNESS INSPECTION
@ Harness side
connector
Engine control )module harness
side connector
- -6FU1735
Check for open circuit, or short-circuit
to ground, between idle air control motor and engine control module.
l
Idle air control motor connec-
tor: Disconnected
l Engine control module connec- tor: Disconnected0 OKSA
STOP
Repair the
harness
ml - El)
Km - El)
J
ACTUATOR INSPECTION
Use a sound scope to check if the sound of the idle air control
motor operating can be heard immediately after the ignition
switch is turned to “ON”.
NOTE
If the sound of the servo operating cannot be heard, check the
motor drive circuit and the idle air control motor.
TSB Revision

13-186On-Vehicle Inspection of MFI
FUEL SYSTEM - Components
IGNITION COIL AND IGNITION POWER TRANSISTOR
-Distributor(built inignition coiland Ignitionpower
transistor)
Equrpment srdeconnector8”
Engine control module connector Spark
plug
Iynitron coil ‘r ,
lgnitron switch (IG,)
Distributor/,@)f1
9 Harness side
connector
4
lgnrtion timingadjustment
connector
7FU0653
Engine control module 9FUOO35
OPERATION Refer to
P.13-96.
INSPECTION Using

Scan Tool
Function
/ Item No.
Data reading
i 44 Data display
iCheck condition jEngine state
Standard value_.-___-- -
-
Ignition
advance
l Engine: Warming up Idle speed
0- 13 “BTDC
l Timing light: Set (set
timing light to check
actual ignition timing)
/--
-
2,000 rpm 19-39 “BTDC
1 TSB Revision1

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
TSB Revision

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.
I%% RevisionI

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,
1 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
TSB Revision1