1989 MITSUBISHI GALANT Service Repair Manual

FUEL SYSTEM -Service Adjustment Procedures 13-35
(14)Adjust the play of the accelerator cable. (Refer to P.13-
329.)
(15)Connect the idle-speed control motor’s connector.
(16)Adjust the throttle-position sensor.
(17)Start the engine again and let it run at idle speed for about
ten minutes; check to be sure that the idling condition is
normal.
THROTTLE BODY (THROTTLE VALVE AREA)
CLEANING
MllFlCK
(1)Start the engine and warm it up until the temperature of the
engine coolant reaches
80°C (176°F) or higher; then stop
the engine.
(2) Disconnect the air intake hose at the throttle body side.
(3) Spray cleaning liquid (from the intake port of the throttle body) onto the valve, and then leave as is for about fiveminutes.
(4) Start the engine and race it a few times; then let it run at idle speed for about one minute.
NOTE
If the engine idling speed is unstable (or the engine stalls),
let the engine run with the throttle valve slightly open.
(5) If deposits are not removed from the throttle valve, repeat steps (3) and (4).
(6) Connect the air intake hose.
(7) Using the scan tool, erase the diagnostic trouble code, or disconnect the battery’s ground cable for ten seconds orlonger and then reconnect it.
(8) Adjust the basic idle speed (engine speed adjusting screw). (Refer to
P.13-33.)
(9) Adjust the throttle position sensor.
-rottle position ” ynsor connector
(2) If a scan tool is not used, perform the following operation.
< 1989 models> @ Disconnect the throttle position sensor connector and
use the special tool (test harness) between the discon-
nected connector.
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THROTTLE POSITION SENSOR ADJUSTMEiW&
Caution
The adjustment of the throttle-position sensor should be
made after completion of the basic idle-speed adjustment.
(1) Connect the scan tool to the data link connector (white).
,

13-36 FUEL SYSTEM - Service Adjustment Procedures
:I989 models>
M
D9684783FUO179
models> Sensor side connector
@ Connect a digital type voltmeter between terminal @
(blue clip, sensor output) of the throttle position sensor
and terminal
@I (red clip, sensor ground).

@I Disconnect the throttle position sensor connector and use the special tool (test harness set) between the
disconnected connector.
@ Connect a digital type voltmeter between terminal @
(sensor output) of the throttle position sensor and
terminal
@I (sensor ground).
1 FU0619
(3) Switch ON the ignition switch (but do not start the engine) and leave as is for 15 seconds or longer.
NOTE
When the ignition switch is switched ON, the idle speedcontrol plunger extends to the fast-idle opening degree,
and, after 15 seconds have passed, contracts to the initial
position and stops there.Initial position: the suitable idling position at which the idle speed control motor position sensor output
voltage is 0.9 V.
(4) Check the throttle-position sensor’s output voltage. If the scan tool is used, select No. 14 and then read the
throttle-position sensor’s output voltage.
Standard value: 0.48-0.52
V
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FUEL SYSTEM (SOHC-8 VALVE> -Service Adjustment Procedures 13-37
--
MO-L
6FU1405
(5) If there is a deviation from the standard value, loosen the
throttle-position sensor installation bolt and then turn the
throttle-position sensor itself to make the adjustment. Be
sure to securely retighten the bolt after making the
adjustment.
NOTE
lThe output voltage becomes higher when the throttle-
position sensor is turned clockwise.
lA diagnostic trouble code for idle speed control motor position sensor may be output when adjusting the
throttle position sensor. The reason is that, when the
throttle position sensor is turned, the throttle position sensor voltage may differ from the normal voltage dur-
ing idling, but this is no malfunction of the idle speed
control motor position sensor.
(6) Switch OFF the ignition switch. (7) If a diagnostic trouble code is output when adjusting the throttle position sensor, use the scan tool and erase the di-
agnostic trouble code or first disconnect the battery (-)
cable from the battery terminal for IO
seconds or more and
then reconnect it. (This will erase the memory for the diag- nostic trouble code due to adjustment of the throttle posi-
tion sensor.)
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13-38
FUEL SYSTEM - On-Vehicule inspection of MFI Components
ON-VEHICLE INSPECTION OF MFI
COMPONENTS
COMPONENT LOCATION
Ii111 I‘I 1 II
bEM0148
6FUO843
M?BYA-
Name Symbol Name
Symbol
Air conditioning compressor clutch relay
JIgnition coil (ignition power transistor)F
Air conditioning switch 0Ignition timing adjustment terminalR
Crankshaft position sensor and camshaft posi- InjectorIGtion sensor-Multiport fuel injection relayN
Data link connectorS - Oxygen sensor
A
EGR solenoid
K-Park/neutral position switch M
EGR temperature sensor
L-Power steering pressure switchU
Engine control moduleQ- Throttle position sensorD
Engine coolant temperature sensorE- Vehicle speed sensor (reed switch)P
Evaporative emission purge solenoidHVolume air flow sensor (incorporating intake
Fuel pump check terminalTair temperature sensor and barometric pres-B
-sure sensor)
Idle speed control motor (closed throttle posi-
tion switch, idle speed control motor position
Csensor)
NOTEThe “Name” column is arranged in alphabetical order
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FUEL SYSTEM - On-Vehicule Inspection of MFI Components13-39
Oxygen sensor
n
1<19& &odekw
sensor
,,< \;F”O85:
:Frory zy models>7-motor (closed
throttle sition
switch and
or
Dositionsensor)
1;’Y/\l IV/A 6FU;4061
1\
6FUO8571\ \I / /
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13-40 FUEL SYSTEM - On-Vehicule Inspection of MFI Components
k J Au
condltioning’~l11iz ii
switch/
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@$ Q I)
RF7 ;;AJ’
,;I \, _Ii
,--\y-,
,‘c/ ’
ili-
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- A
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2%.
6FUO984
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FUEL SYSTEM - On-Vehicule Inspection of MFI Components13-41
Ciaarette
COMPONENTS INSPECTION PROCEDURE-
USING THE SCAN TOOL
Ml BYBAG
(1) Switch OFF the ignition switch.
(2) Insert the power-supply terminal of the scan tool into the cigarette lighter socket.
lf it is necessary to make the inspection while cranking the
engine, use the battery harness to take power directly from
the battery.
(3) Connect the scan tool to the data link connector.
(4) Switch ON the ignition switch.
(5) Select the vehicle model and the system. l Select by pressing the
m key.
(6) Select the function, and then check the input and outputsignals of the engine control module.If there is an abnormal condition, check the body harness,
the component itself, etc., and repair as necessary.
l Function selection menu
q SELF-DIAG CODE
q DATA LIST
q ACTUATOR TEST
q SPECIAL TEST
l After checking, press the m key.
(7) After making the repair, use the scan tool to recheck, and confirm that the abnormal condition of the input and output
signals has been corrected to the normal condition by the
(9) FrizE’the diagnostic trouble code from the memory.
lUse the scan tool to make the erasure. (Refer to P.13
17.)
lSwitch OFF the ignition switch and disconnect the ground

cab\e from the batteq Ie’tm
a\ for ten seconds

13-42 FUEL SYSTEM - On-Vehicule Inspection of MFI Components
(9) Switch OFF the ignition switch. (10)Disconnect
the scan tool. (11)Restart
the engine and perform a driving test, etc. to
confirm that the malfunction has been corrected.
POWER SUPPLY
Engine
control moduleu\\ v
OPERATION
l While the ignition switch is ON, battery power
supply is supplied to the engine control module,injectors, volume air flow sensor, etc.
l When the ignition switch is switched ON, cur-
rent flows from the ignition switch, via the MFI
relay coil to ground.
INSEPCTION
Using Scan Tool
relay ’
\/\/\/“
2
“3 “6
CL I 4,
Harness
side connector
Engine control module connector OlLO838
As a result, the MFI relay switch is switched ON,
and power is supplied, by way of the
MFI relay
switch, from the battery to the engine control
module.
IFunctionData displayICheck conditionsIStandard valueI
Data reading16Engine control modulepower-supply voltageIgnition switch: ONBattery positive voltage
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