1989 MITSUBISHI GALANT Service Repair Manual

FUEL SYSTEM VALVE> -On-Vehicule lnsoection of MFI Comoonents13975
@ Harness srdeconnector
@ Harness sideconnector
Check for continuity of the ground
circuit.
. Connector: Disconnected
1 Reoair the
t
hainess.
(@B-Ground)
Check the voltage of the output cir-
cuit.
. Connector: Disconnected
. ignition switch: ON
u
O
K
ASTOP
Repair the
harness.
(@m-m)
CRANKSHAFT POSITION SENSOR MIBYMAB
m/i /i 6FUO6571
[VI 1 Output characteristic
@ Component sideconnector
Ignition switch (IG1)
One rotation of crankshaftposition sensor
01R0’05
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Engine control module,( 21
m---l 7F”04pp
I

13-76 FUEL SYSTEM -On-Vehicule Inspection of MFI Components
OPERATION
TROUBLESHOOTING HINTS
INSPECTION-Using Scan toolINSPECTION-Using Oscilloscope
Refer to P.13-73.
HARNESS INSPECTION
7
7FlJO49t
@Harness sideconnector
7FUO497
ISS stde connector
Measure the power supply voltage.
. Connector: Disconnected
. Ignition
switch: ON
Voltage (VI
Battery positive voltageI
cl2
Repair theharness.
K%l-Ignition
switch)
Check for continuity of the ground
circuit,
Connector: Disconnected
Repair the
harness.
@RI-Ground)
Check the voltage of the output cir-
cuit.
. Connector: Disconnected
. Ignition switch: ON
0
O
K
a@
Repair theharness.
vi!iaI-m1,
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FUEL SYSTEM -On-Vehicule Inspection of MFI CmpOnentS13977
IGNITION SWITCH-ST
>
Engine control module connector
II
Enginecontrolmodule01 LO838
Ignition switch (ST)
7
Tr108104
T-7JL
6FU1257
OPERATION
lThe ignition switch-ST inputs HIGH-level signalslWhen the ignition switch is set to START, the
to the engine control module during engine battery voltage during engine cranking is, by
cranking. The engine control module, based onway of the ignition switch, applied to the engine
those signals, regulates fuel injection during
control module, and the engine control module
starting, etc.thus detects the fact that the engine is cranking.
INSPECTION
Using Scan tool
Function Item No.1 Data display
Inspection conditions EngineNormal indication
Data reading 18 Switch status
Ignition switch: ON
Stopping
OFF
CrankingON
HARNESS INSPECTlON
Engine controlmodule harness
side connector
Measure the input voltage to the en-
gine control module.
. Engine control module connector: Disconnected
- Ignition switch: START
r6FU1259i
Repair theharness. @El-
Ground)
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13-78 FUEL SYSTEM VALVE> -On-Vehicule inspection of MFI Components
IGNITION SWITCH-ST AND PARK/NEUTRAL POSITION SWITCH
MI3YOAa
Park/neutral position s( I‘\\ \
1lclnition switch (ST)
Componentside connector@
108
Engine ’control
module
Harness side@I connectorI7
Engine control module connector
OlLO838
OPERATION
lThe ignition switch-ST inputs HIGH-level signals
to the engine control module during engine cranking. The engine control module, based on
those signals, regulates fuel injection during
starting, etc.
l When the ignition switch is set to START, the
battery voltage during engine cranking is, by
way of the ignition switch and the park/neutral
position switch, applied to the engine control
module, and the engine control module thus de-
tects the fact that the engine is cranking.
Note that battery voltage is not applied to the
engine control module if the position of the se- lector lever is other than the “P” or “N” range.
l The park/neutral position switch functions to convert the voltage to HIGH level or LOW level
TROUBLESHOOTING HINTS
If the output of the park/neutral position switch is
abnormal even though the results of the checking
of the park/neutral position switch harness and of depending upon whether the selector lever is at
the “P” or “N” range or is at some position other
than the “P” or “N” range, and inputs the result
to the engine control module. The engine con-
trol module, based upon those signals, then reg-
ulates the operation of the idle speed control
motor.
l Battery voltage within the engine control mod-
ule is applied, by way of the resistance, to the
park/neutral position switch. When the selector
lever is set to the
‘7” or “N” range, continuity is
created, via the starter motor, between the en-
gine control module’s park/neutral position
switch terminal and ground, and the terminal
voltage becomes LOW level.
the component itself are normal, it is probable that
the cause is improper adjustment of the control
cable.
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FUEL SYSTEM - On-Vehicule Inspection of MFI Components13-79
INSPECTION
Using Scan tool
Ignition switch-ST
Function Item No.Data display Check conditions
EngineNormal display
Data reading 18 Switch status
. Ignition switch: ON Stopped
OFF
CrankingON
Park/neutral position switch
Function
Item No.Data display
Check conditions Selector lever position
Normal display
Data reading 29 Shift position
. Ignition

swatch: ON Por NPor N
D, 2, Lor RD, 2, L or R
HARNESS INSPECTION
Harness sideconnector
Engine control
Measure the input voltage of engine
control module.
. Engine control module connector: Disconnected
. Park/neutral position switch con-
nector: Connected
* Selector lever: “P” range
. Ignition switch: START
Voltage (V)
:
1
Y-OlLO42’f
PARK/NEUTRAL POSITION SWITCH INSPECTION
Measure the power supply voltage of
the park/neutral position switch.
. Engine control module connector: Disconnected
. Park/neutral position switch con-
nector: Disconnected
Check the
I+
power
supply cir-
cuit.
Measure the park/neutral position
switch terminal input voltage.
* Engine control module connector: ConnectedPark/neutral position switch con-
nector: Disconnected
8 or more
ASTOP
Repair the
harness.
C@W lIEI)
Refer to GROUP 23-Troubleshooting.
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13-80 FUEL SYSTEM -On-Vehicule Inspection of MFI Components
VEHICLE SPEED SENSOR
Vehicle speed sensor
Vehicle speed sensor
IV1
-errnInafoltage
102418
Frwyy 1/
Component side@ connector
Component side@ connector
6FU1410
Engine control
module
5v
MIBVPAA
Vehicle speed sensor
Engine control module connector Vetwle
speed [km/h (mph)]
16245

1
OlLO838
OPERATION
l
The vehicle-speed sensor is incorporated within
the speedometer; it converts vehicle-speed
data to pulse signals and inputs those signals to
the engine control module. The engine control
module, based upon those signals, regulates the
idle-speed control motor, etc.
TROUBLESHOOTING HINTS l
The vehicle-speed sensor, by intermitting by the
reed switch the flow (to ground) of the approxi-
mately
5V voltage applied from the engine con-
trol
module, produces vehicle-speed signals.
If ‘there is damaged or disconnected wiring, or a
short-circuit, of the vehicle-speed sensor signal
circuit. the engine may stall when the vehicle speed is reduced and the vehicle is stopped.
HARNESS INSPECTION
-side connector
_--- _
ia
_, - .,
:_--
gp
p
L
11Engine control
module harness
=l01AOW(1
I
Check the vehicle speed sensor out-
put circuit for continuity.
. Engine control module connector: Disconnected
. Move the vehicle.
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FUEL SYSTEM - On-Vehicule Inspection of MFI Components13-81
@ Harness sideconnector
6FU1265
n
8171615141312 11 9 1171615141312~1~1

0
I
Measure the power supply voltage of
the vehicle speed sensor.
. Connector: Disconnected
. Ignition switch: ON
6&loIw I
Voltage (V)
I4.5-4.9--I
Repair theharness.
II
I
Check for continuity of the ground
circuit.
Connector: Disconnected
Repair the
harness.
@WGround)
SENSOR INSPECTION
Refer to GROUP 54-Meters and Gauges.
POWER STEERING PRESSURE SWITCH MI3Yclha
------LI~lI I’ 6FUO65f
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Engine
Power steering 1@
blHarness sideconnector
Enoine control module connector

13-82 FUEL SYSTEM -On-Vehicule Inspection of MFI Components
OPERATION
l The power-steering pressure switch functions
to convert data as to whether there is or is not apower steering load to LOW-or HIGH-level vol-
tage, and the resulting signals are input to the engine control module. The engine control mod-
ule, based upon those signals, regulates the
idle-speed control motor. l The battery voltage within the engine control
module is applied, by way of the resistance, to
the power-steering pressure switch. When
steering maneuvers are made, the pressure of
the power-steering oil increases, thus switching
ON the power-steering pressure switch, with
the result that the current is grounded. As a re-
sult, the power-steering pressure switch vol-
tage changes from HIGH level to LOW level.
INSPECTION I) Using Scan tool
Function
Item No.
Data reading 27
Data displayInspection conditions Steering wheelNormal indication
Switch status Engine: IdlingSteering wheel idle stateOFF
During steering wheelONoperation
(2) Checking Oil Pressure
Steering wheel
Straight forward
Turned
Oil pump delivery pressure (ref. value)
less than 1,470- 1,961 kPa (213-284 psi)
more than
1,470- 1,961 kPa (213-284 psi)
HARNESS INSPECTION
I-E-I
Harness side connector 6 0
@=- -0
Q
4 1
Measure the power supply voltage.
. Connector: Disconnected. Ignition switch: ON
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