check engine MITSUBISHI GALANT 1989 Service Repair Manual

13-166
On-Vehicle Inspection of MFI
FUEL SYSTEM
- Components
INSPECTION
Using Oscilloscope Refer

to P.13-69.
HARNESS INSPECTION
c
IIlFUO633j switch
1218 Harness -.-..-Aside
connectorCheck for continuity of the ground
circuit.
l Crankshaft
position sensor connec-
tor: Disconnected
Ground) lFUO634
I
3:
@ Harnessside connectorfF
68
Engine control
module harness
side connector
J 9P-
l Crankshaft position sensor connec-
tor: Disconnected
9FUOO29 II
Check for open circuit or short circuit
to ground, between camshaft position
sensor and engine control module.
l Engine control module connec- tor: Disconnected
Measure the impressed voltage.
l Crankshaft position sensor connec- tor: Disconnected
l Engine control module connec-
tor: Connected
l ignition switch: ON
Voltage
(V)
4.8 - 5.2 module
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FUEL SYSTEM (SOHC-16 VALVE> - :::%%t:nspection Of MF’13-169
INSPECTION
Using Scan Tool
i
t
/FunctionItem No. i Data display Check condition Check content
Normal state
Data reading
) 22( Cranking l Engine cranking
speed l Tachometer con-’ Compare cranking speed, Indicated speed to
and scan tool reading agree
netted (check on and ~

I
off of primary current 1
of ignition coil by1
tachometer)
Function 1
Item No. Data display ICheck condition !Check content Normal state
Data reading
i 22 ~
Idle speed l Engine: idling! l Closed throttle posi-
tion switch: ONp i ;;:;;:::;;:;;;
20°C (68°F)1 l,lOO-1,300 rpm
40°C
(I
04°F)950-I ,I 50 rpm
: 80°C (176°F) ~
600-800 rpm
I
Using Oscilloscope
Refer to P.13-74.

13-170FUEL SYSTEM - ::$%:ti=pection Of MF’
HARNESS INSPECTION
III@ HarnessMeasure the power supply voltage.-/-J side connectorl Crankshaft position sensor connec-
tor: Disconnected
l Ignition switch: ON
Voltage
(VI
Repair the
hahrness
(@a - Igni-
B+tion switch)
or check the
ignition
lFUO633 !switch
1 FU0634
side connectorside connector
Engine control module
Engine control moduleharness side connect01harness side connect01
9FUOO30
Check for continuity of the ground
circuit.
l Crankshaft position sensor connec- tor: Disconnected
1 Repair th
e
Check for open circuit, or short-circuit
to ground, between crankshaft posi-
tion sensor and engine control mod-
ule.
l Engine control module connec-
tor: Disconnected
l Crankshaft position sensor connec-
tor: Disconnected ~
Repair the
+ harness
/ @El-El)
*
lFUO637
Measure the impressed voltage.
l Crankshaft position sensor connec- tor: Disconnected
l Engine control module connec-
tor: Connected
l Ignition switch: ON
1 TSB Revision

On-Vehicle Inspection of MFI
FUEL SYSTEM (SOHC-16 VALVE> - Components13-171
IGNITION SWITCH-ST Ignition switch (ST)
Engine control module connector T
-nEngine control module5171
OPERATION INSPECTION
Using Scan Tool
Refer to
P.13-77. 7FUO653
6FU1267
HARNESS INSPECTION
Engine control
module harnessMeasure the input voltage to theside connectorengine control module.
l Engine control module connec-
tor: Disconnected
l Ignition
switch: START
harness
(j?iJ - lgnitiol
switch) or
check the
ignition
6FUl258switch/
module harnesside connector
l Engine control module connec-
tor: Disconnected
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13-172
On-Vehicle inspection of MFI
FUEL SYSTEM
- Components
IGNITION SWITCH-ST AND PARK/NEUTRAL POSITION SWITCH
Ignition switch (ST)
-T-@ k&pe;grt side
Starter Sterminalf
8
I 7FUO653
Engine control module
0~~~2~5
Engine control module connector
OPERATION
TROUBLESHOOTING HINTS INSPECTION
Using Scan Tool
Refer to
P.13-78.
HARNESS INSPECTION
r
I!-@ Harnessside connector
II1Measure the power supply voltage of
B o
4’
_j
F---l
the park/neutral position switch.-
0
Il Engine control module connec-
tor: DisconnectedI
l Park/neutral position switch con-0/
r
I nectar:
Disconnected
I l Ignition switch: START
Voltage
(V)
he 9FUO266
~

/B+
IiEngine control
module harness
9 HarnessIFside connector
Check for continuity between park/
neutral position switch and engine
control module.
l Engine control module connec- tor: Disconnected
l Park/neutral position switch con- nector: Disconnected
NOTE
Touch the circuit tester probes to
both ends of the harness
9~~0267
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cl OK
/ Repair the
-I, harness
j ml-m

13-174FUEL SYSTEM - :::;:%t~pection Of MF’
HARNESS INSPECTION
Engine control module
harness side connectorCheck the vehicle speed
sensor-output circuit for continuity.
l Engine control module connec-
tar! Disconnected
l Move the vehicle.
Engine controlmodule harness
side connector
66
r,‘=6FUl778
Check for open circuit or short-circuit
to ground, between engine controlmodule and vehicle speed sensor.
l Engine control module connec- tor: Disconnected
l Vehicle speed sensor connector: Disconnected Repair the
harness
@El - 8)
Check for continuity of the ground
speed sensor:
Discon-
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6FU1465 /
Measure the impressed voltage.
l Vehicle speed sensor connector: Disconnected
lEngine control module connec-
SENSOR INSPECTION Refer to GROUP
54-Meters and Gauges.

On-Vehicle Inspection of MFI
FUEL SYSTEM - Components
POWER STEERING PRESSURE SWITCH13475
700 - 2,000 (7
- 20,;i~~*~2,000
100 - 284)213- 164)
Pressure
fkPa (kg/on?*. psi11
Enaine control module connector
Enginecontrol
module
Power steering
pressure switch
@ Harness side connector
IIll
7FUO536
I
OPERATION
INSPECTION
Using Scan Tool Refer
to
P.13-82.
7Fuo653
HARNESS INSPECTION
side connector
Engine control
module harness
side connector
I
7FU1235Check for open circuit or short-circuit
to ground, between engine control module and power steering pressure
switch.
l Power steerina messure
switch
connector: Disconnected
l Engine control module connec-
tor: Disconnected
I
Repair the
harness
(@m -11071)
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On-Vehicle Inspection of MFI
FUEL SYSTEM (SOHC-16 VALVE> - Components13-177
HARNESS INSPECTION
Y
Engine control
module harness
-;side connector
01noee3
AIR CONDITIONING INSPECTION
Refer to GROUP
55-Air Conditioning. Measure the power supply voltage of
the air conditioning circuit.
I
l Air conditioning switch: ON
l Engine control module connec- tor: Disconnected
l Ignition switch: ON
EGR TEMPERATURE SENSOR
GR temperature s
@ Equipment side connector
Check the
air condi-
tioning circuit
EGR temperature sensor71@ Harness sideconnector
i
I*Temperature16210067FU1013
OPERATION
Refer to P.13-85.
INSPECTION
Using Scan tool
Function
Data reading
I
Item No
43
I
Data display
Sensor
temperature
I
Inspection conditions Engine condition Standard value
. Engine: warm up
* Engine is maintained in a . Idle
speed 7o’C (158°F) or lower
constant state for 2 minutes or more 3,500 rpm
70°C (158°F) or higher
* Remove the vacuum
hose (green stripes) from
the EGR solenoid and plug both the removed
vacuum hose end and
solenoid valve nipple.
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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)
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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)
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