set MITSUBISHI GALANT 1989 Service Owner's Guide

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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13-96 FUEL SYSTEM - On-Vehicule Inspection of MFI Components
IGNITION COIL AND IGNITION POWER TRANSISTOR
ignition coil (IGI)
Ml3WAA
Harness side
@connector0
Harness side
Component side
Distributor\/ 2
4.I_lgnltion. .!
I@LZ)
TachcImetertimingA? I--:*:^^adjustment-_
Lllrnacr
r;rlnI 101 i IG.72 Jl”F
Componenr side
6FU1280
OPERATION
l When the ignition power transistor unit is
switched ON by the signals from the engine
control module, the primary current of the igni-
tion coil will flow. When the ignition power tran-
sistor unit is switched OFF, the primary current
flow is interrupted, and high voltage is produced
at the secondary coil.
l When the engine control module switches OFF
INSPECTION
the power transistor within the unit, the battery
voltage within the unit is applied to the ignition
power transistor unit, and the ignition power
transistor unit is switched ON. In addition, the power transistor unit is switched OFF when the
engine control module switches ON the power
transistor within the unit.
Using Scan tool
1 Function1 Item No.1 Data display / Inspection conditions/ Engine condition 1 Standard value
Data reading 44
Ignition
advance . Engine: warm up
750 rpm (idling)5- 15 “BTDC. Timing light: set(Use the timing light to
check the actual ignition
2,000 rpm 30-40 “BTDCtiming.)
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13-106
FUEL SYSTEM - On-Vehicule Inspection of MFI Components
TERMINAL VOLTAGE CHECK CHART
Terminal arrangement of engine control module connector NflTF
01 LO838
. .- -B+: Battery positive voltage
Terminal
No.Check condition (Engine state)StandardvalueRemarksCheck item
103
Backup power supply lgnitron
switch: OFF
102Power supply ignition switch: ONB+
107
109
Fuel pump dnve signal
Engine: Cranking 8V or higher
Engine: Idling
B+I
Ignition switch: ON
Engine:
ldlrng
Ignition switch: ON
Engine: idling
Engine speed: 2,000 rpm
B+I
o-3v
4.5- 5.5v
2.2- 3.2V
56
23
10
Multiport fuel
injection relay
(Fuel pump)
Sensor
rmpressecvoltage
Volume air flow
sensor
Air intake
temperature sensor Ignition
Air intake temperature of
0°C (32°F)switch:ONAir Intake temperature of 20°C (68°F); ji/
Air Intake temperature of 40°C (104°F)1.5-2.1V
Air intake temperature of 80°C (176’F)0.4- 1 .OV
Barometric
pressure sensor
Ignition
Altitude of 0 m (0 ft.)3.7-4.3vswitch:ON Altitude
of 1,200 m (3,937 ft.)3.2-3.av
Engrne coolant lgnitron
Coolant temperature of 0°C (32°F)3.2-3.Wtemperature switch: -sensorONCoolant temperature of 20°C (68°F)2.3-2.9v
1 Coolant temperature of 40°C
(104°F) 1 1.3- 1.9V(
) Coolant temperature of 80°C
(176’F)
1 0.3-0.9V
Throttle posrtionsensor Ignition swatch: It
Set the throttle valve to the
is kept ON for 15
seconds or more
Closed throttle position switchII
I
I
-
Ignition Set the throttle valve to the idlingo-1vswitch:position.3NSlightly open the throttle valve. 4V
or higher
3
16
!O
9
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FUEL SYSTEM -On-Vehicule Inspection of MFI Components13-107
TerminalCheck ItemCheck condition
(Engine state)StandardNo.valueRemarks
22
Camshaft position Engine: Cranking0.2 - 3.ov
sensor
Engrne: ldllng
21Crankshaft position Engine: Crankingsensor
Engine: Idling0.2 - 3.ov
108
104
18
lgnrtron switch-ST Engine: Cranking 8V
or higher
Park/neutral Ignition
Set the selector lever to
P or N.o-3v
position switch switch
:
ONSet the selector lever to D, 2, L or R.8- 14V
Vehicle speed
l Ignition switch: ON
sensor l Slowly run the vehicle forwardkeFaF:hevariation.)
Power steering
pressure switch
;;ir;z;ditioning
Engine:Steering wheel idle state
Idling opera-
tion after
warming-up During steering wheel operation
Engrne:Turn OFF the air conditioning switch.
Idling
Turn ON the air conditioning switch.(The air conditioning compressor is in
the drive state.)
B+
o-3v
o-3v
B+
35
1
51
52
50
51
54
Air conditioning
compressor
clutch relay
Oxygen sensor
No.
1 Injector
No. 2 Injector
No. 3 Injector
No. 4 Injector Ignition power
transistor unit l Engine: Idling
B+ or
l Air conditioning switch: OFF-ON temporarily
(The air conditioning compressor is in the 6V or
higher
drive state.)o’- 3v
Engine: Keep the engine speed at 2,000 rpm
after warming up. kQatot8h2:
(For checking, use a digital voltmeter.) variation.)
Engine: After warming up, rapidly press the
Voltage
accelerator pedal from the idling state. temporarily
drops slightly
from
14V to1 IV.
Engine speed: 3.000 rpm0.3- 3v
Evaporative
emission purge
solenoid ignition switch: ON
Keep the engine speed at 3,000 rpm after the
warmed-up engine is started.B+
o-3v
12Ignition timing
adjustment terminal
ignition
Ground the ignition timing adjustment o- 1vswitch:
terminal.ONRelease the ground of the ignition4.0- 5.W timing
adjustment terminal.
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13-120FUEL SYSTEM - Troubleshooting
CHH;K
ENGINE/MALFUNCTION INDICATOR
Among the on-board diagnostic items, a check engine/mal-
function indicator lamp comes on to notify the driver
of the
emission control items when an irregurality is detected. However, when an irregular signal returns to normal and the
engine control module judges that it has returned to normal,
the check engine/malfunction indicator lamp goes out. Moreover, when the ignition switch is turned off, the light goes
Check engine/malfunctionout. Even if the ignition switch is turned on again, the light doesindicator lamp68A.0093not come on until the irregularity is detected.
Here, immediately after the ignition switch is turn on, the
check engine/malfunction indicator lamp is lit for 5 seconds to indicate that the check engine/malfunction indicator lamp op-
erates normally.
ITEMS INDICATED BY THE CHECK ENGINE/
MALFUNCTION INDICATOR LAMP
Engine control module
Oxygen sensor
Volume air flow sensor
Intake air temperature sensor
Throttle position sensor
Engine coolant temperature sensor
Crankshaft position sensor Camshaft position sensor
Barometric pressure sensor
Ignition timing adjustment signal
Injector
EGR
Caution
Check engine/malfunction indicator lamp will come on
even when terminal for ignition timing adjustment is short-circuited. Therefore, it is not abnormal that the
light comes on even when terminal for ignition timing
adjustment is short-circuited at the time of ignition tim-
ing adjustment.
CHECK ENGINE/MALFUNCTION INDICATOR LAM
P
INSPECTION
(1) Check to be sure, when the ignition switch is set to the “ON” position, that the lamp illuminates for about five
seconds and then switches OFF.
(2) If the lamp does not illuminate, check for damage or dis- connection of the harness, or for a blown fuse or a failedlight bulb.
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13-126FUEL SYSTEM - Troubleshooting
FAILSAFE/BACK-UP FUNCTIONS LIST
If trouble with any major sensor is detected by the on-board diagnostic,\
the vehicle will be kept in the safe
driving conditions according to the preset control logic.
Trouble item Control content for trouble
Volume air flow(1)Fuel injection timing and ignition timing are determined according to th\
e throttle positionsensorsensor (TPS) and engine revolution speed signal (crankshaft position \
sensor signal).(2)The IAC motor is fixed in the appointed position so idle air control is not per\
formed.
Intake air temperature The control is executed with the suction air temperature regarded as
25°C (77°F).sensor
Throttle position The fuel injection rate is not increased for acceleration according to t\
he throttle position
sensor (TPS)sensor signal.
Engine coolantThe control is executed with the coolant temperature regarded as 80°C (176’F).temperature sensor
Camshaft positionSimultaneous injection of fuel is executed for all cylinders. (In this \
case, the
No.1 cylinder top
jenS0r
dead center is not detected at all after the ignition key is turned
on.)3arometric
pressure The control is executed with the pressure regarded as 760 mmHg
(30 in. Hg.).
sensor
AC valve position Idle air control motor is not performed.;ensor
Ixygen sensor
Closed loop control of the air/fuel mixture ratio is not executed.
READ OUT OF DIAGNOSTIC TROUBLE CODE
Refer to P.13-16.
EbW&R MEMORY OF DIAGNOSTIC TROUBLE
Refer to
P.13-17.
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FUEL SYSTEM - I?~FS~~ZFZLnt Procedures13-133
FUEL TANK AND FUEL LINEMIBEAAB
Symptom
Probable cause Remedy
Engine malfunctions
due to insufficient
fuel supply Bent or kinked fuel pipe or hose
Clogged fuel pipe or hose
Clogged fuel filter or in-tank fuel filter
Water in fuel filter Repair or replace
Clean or replace
Replace
Replace the fuel filter or clean the
fuel tank and fuel line
Dirty or rusted fuel tank interior
Clean or replace
Malfunctioning fuel pump
(Clogged filter in the pump)Replace
Evaporative emission
control system
malfunctions
[When fuel tank filler
tube cap is removed,
pressure releasingnoise is heard) Mispiping of vapor line
Disconnected vapor line piping joint
Folded, bent, cracked or clogged vapor line
Faulty fuel tank filler tube cap
Malfunctioning fuel tank pressure control valve Correct
Correct
Replace
Replace
Replace
SERVICE ADJUSTMENT
PROCEDURES
CURB IDLE SPEED INSPECTIONhll3MAE
(1) The vehicle should be prepared as follows before th
e
inspection.
lEngine coolant temperature: 85-95°C (185-203°F)
l Lights, electric cooling fan and accessories: OFF
l Transaxle: Neutral (P for vehicles with an automatic
transaxle)
(2) Connect a tachometer.
NOTE
Refer to
P.13-134 for information concerning connection Of
a tachometer.
(3) Set a timing light in position.
(4) Ground the terminal for adjustment of ignition timing.
(5) Start the engine and let it idle.
(6) Check whether or not the ignition timing is the standard
value; if not, adjust.
Standard value:
5”BTDC f 2”
(7) Stop grounding the terminal for adjustment of ignition timing.
(8) Let the engine idle for two minutes.
(9) Check the idling rpm.
Curb idle speed: 700
31100 rpm
NOTE
The idling rpm is automatically regulated by the idle aircontrol system.
(lO)lf not within the standard value range, refer to the CHECK
CHART CLASSIFIED BY PROBLEM SYMPTOMS and check
the
MFI component,
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FUEL SYSTEM VALVE> -Service Adjustment Procedures13437
I;gFixed SAS
Terminal @Terminal @(sensor output) (sensor ground) /
(3)Insert a feeler gauge with a thickness of 0.65 mm (.0256 in.)
between the fixed SAS and the throttle lever.
(4) Loosen the throttle position sensor mounting bolt; then turn the throttle position sensor body fully counter clock-
wise.
(5) In this condition, check for continuity between terminals
@
and 0.
(6) Slowly turn the throttle position sensor in the clockwise di- rection until the point at which continuity between termi-
nals
@I and @ changes to non-continuity is found.
Tighten the throttle position sensor installation bolt at that position.
(7) Connect the connector of the throttle position sensor.
(8) Connect the scan tool to the data link connector (white).
(9) If not using the scan tool, proceed as follows:
0 Disconnect the throttle position sensor connectors and connect the special tool, Test Harness Set, between
the disconnected connectors.
0 Connect a digtal voltmeter between the throttle posi-
tion sensor terminal
@ (sensor output) and terminal Q
(sensor ground).
(lO)Turn the ignition switch ON (but do not start the engine).
(11)Check the throttle position sensor output voltage.
When using the scan tool, select item
No.14 and read the
throttle position sensor output voltage.
Standard value:
400-1000 mV
(12) If there is a deviation from the standard value, check the throttle position sensor and the related harness.
(13) Remove the feeler gauge.
(14) Switch OFF the ignition switch.
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On-Vehicle Inspection of MFI
13-158FUEL SYSTEM (SOHC-16 VALVE> - Components
OPERATION
aThe throttle position sensor converts the throttle position opening into a voltage and inputs it to the
engine control module, which
then controls
the
fuel injection, based on the input signal.
l The
5V power in the engine control module is
supplied to the throttle position sensor. It flows
through the resistor in the sensor and is then
grounded in the engine control module.
lAs the throttle valve shaft rotates from the idle position to wide open position, the resistancebetween the variable resistor terminal of the
throttle position sensor and the ground terminal increases. As a result, the voltage at the throttle
position sensor variable resistance terminal also
increases.
INSPECTION
Using Scan Tool TROUBLESHOOTING HINTS
Hint 1: The throttle position sensor signal is more important in the control of automatic trans-
axle than in the engine control. Shifting
shock and other troubles will be caused if
this sensor is faulty.
Hint 2: If the output voltage of the throttle position
sensor is out of specification, adjust the
sensor and check the voltage again.
If there is an evidence of disturbed fixed SAS
setting, adjust the fixed SAS.
Function item No.Data displayCheck conditionThrottle valve Standard value
Data14Sensor Ignition
switch: ON At idle position 300 - 1000 mV
readingvoltage
Open slowlyIncreases with valve
opening
Open widely 4,500
- 5,500 mV
HARNESS INSPECTION
-
i1
@ Harness sideconnector
Check for continuity of the ground
circuit.
l Throttle position sensor connector: Disconnected
Repair the
harness.
(ml-m
3 Harnessside connetor
P
ECMharness sidef connector
Check for an open-circuit, or a short-
circuit to ground between the engine
control module and the throttle posi-
tion sensor.
l Throttle position sensor connector:
Disconnected
l Engine control module connec-
tor: Disconnected Repair the
harness. @El

- El)
(@III-ElII
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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
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