MITSUBISHI GALANT 1989 Service Repair Manual

FUEL SYSTEM <DOHC> - Service Adjustment Procedures
13-249
<1989 models> /zz Throttle position
(2) If a scan tool is not used, perform the following operation.,-
~1989 models> @ Disconnect the throttle-position sensor connector,
and connect the special tool (test harness) between the
disconnected connectors.
:1989 models>@Connect a digital-type voltmeter between the @ termin-
al (red clip, sensor ground) and the @I terminal (blue clip,
sensor output) of the throttle-position sensor connec-
tor.
Blue
clip
<From 1990 models> @ 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
@ (sensor ground).
(3) Switch ON the ignition switch. (Do not start the engine.)
(4) Check the throttle-position sensor’s output voltage.
When a scan tool is used, select Item
No.14 to read the
throttle position sensor output voltage.
Standard value:
0.48-0.52 V.
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FUEL SYSTEM <DOHC> -On-Vehicle Inspection of MFI Components13-251
ON VEHICLE INSPECTION OF MFI COMPONENTS
COMPONENT LOCATION
4 QCiW41QQWPQWQ
I l-+-Y8’
-,..I- - IIII\< I IJ I
/ \lI/--Gl/
El q
I &
q
‘\
P P
6EM0166
MIBYA-A
6FUO843
NameSymbol
NameSymbol
Air conditioning compressor clutch relayKidle air control motor (stepper motor)C
Air conditioning switch0Ignition coil (ignition power transistor)G
Closed throttle position switch (fixed SAS)EIgnition timing adjustment terminalR
Crankshaft position sensor and camshaft posi-HInjectorJtion sensor- Knock sensorYData link connectorS~Multiport
fuel injection relayNEngine control moduleQ-Park/neutral position switch <A/T>vEngine coolant temperature sensorF-Power steering pressure switchUEGR solenoidL- Throttle position sensorDEGR temperature sensorM-Turbocharger waste gate solenoidXEvaporative emission purge solenoidI~ Vehicle speed sensor (reed switch)PFuel pressure solenoidwVolume air flow sensor (incorporating intakeFuel pump check terminalTair temperature sensor and barometric pres-B- sure sensor)
Heated
oxygen sensorIA I-
NOTE
The “Name” column is arranged in alphabetical order.II TSB
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13-252FUEL SYSTEM <DOHC>- On-Vehicle Inspection of MFI Components
Heated oxygen sensor
la&/+$&,s ‘T*
1 \‘!;/ *- 7)lY-7
\ I--.P--&O596I ~~
- ~~~- ,,od&>/ ‘I.! m
”<1989 Ilgnltlon co11 (Ignition:
Dower transistor).\ [
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FUEL SYSTEM <DOHC> -On-Vehicle Inspection of MFI Components13-253
116AO41I
!
,
I-
.~-A. 6FUOf512 1
I
I
\
-
’ ‘J je,u-.-.-Air condk&g.~
I- _ .~ ~~-switch ___..~- -
6FUO845
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13-254FUEL SYSTEM <DOHC>- On-Vehicle Inspection of MFI ComponentsVehicle
speed sensor
adjustment terminal
- check terminal ---
-
II
,
Turbocharger
waste gate
a,ylenoid
‘I K&h--
=yq@
control module
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FUEL SYSTEM <DOHC>- On-Vehicle Inspection of MFI Components13-255
COMPONENTS INSPECTION PROCEDURE-
Using Scan ToolMlsYsAGa
Refer to P.13-41.
POWER SUPPLY AND IGNITION SWITCH-IG
zT=f?Qjkeinjection relay
contrc! qcdule ,6A04,,-
----_OFF/ (IN
t5
’ i
4
-
‘OWE;uppl-
Ignition switch [IG,]
Component
side
connect<
763 66.----
1 6FU1331, )r
Ml3YcAB
Harness
@ side connector
01 LO838
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 mul-
tiport
fuel injection relay coil to ground.
INSPECTION
Using Scan tool As a result, the
multiport fuel injection relay
switch is switched ON, and power is supplied,
by way of the multiport fuel injection relay
switch, from the battery to the engine control
module.
Function
Data reading Item No.
Data display Check conditionsStandard value
16
Engine control module power- Ignition switch: O
N
Battery positive voltage
supply voltage
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HARNESS INSPECTION
Engine control
module harness
1-OlLO421
Measure the ignition switch terminal
input voltage.
. Engine control module connector:
Disconnected. Ignition swatch: ON
13-256FUEL SYSTEM <DOHC> -On-Vehicle Inspection of MFI Components
Repair theharness.
(Ignition
switch -
Ilrol) @ Harness side
connector
Measure the power supply voltage ofthe multioort fuel iniection relav.
. Connector: Disconnected
Voltage (V)
IBattery positive voltageI
Repair theharness.
(Batter-y-
@@I)
connector
Engine controlmodule harnessCheck for an open-circuit, or a short-circuit to ground, between the engine
control module and the multiport fuelinjection relay.
. Engine control module connec-tor: Disconnected. Multiport fuel injection relay con-nectar: DisconnectedRepair theharness. 7FUO467
alJ*:
k!ii
054 3 2

-
109
9 7 6 Engine control
module
harnessside connector
@ Harness sideconnector
Check for an open-circuit, or a short-circuit to ground, between the engine
control module and the multiport fuelinjection relay.
.
Multiport fuel injection relay con-nector: Disconnected
@--A
. Engine control module connec-tor: Disconnected Repair the-+ harness.
@@I~ El-@?J. 11071)
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FUEL SYSTEM <DOHC> -On-Vehicle inspection of MFI Components13-257
OlLO521
01
LO220
fx!l
.‘,~‘,_C;:i2J,‘:,
OlLO222
1J 7FUO470
1MULTIPORT FUEL INJECTION RELAY INSPECTION
(1) Remove the multiport fuel injection relay.
(2) Use jumper wires and connect
multiport fuel injection relay
terminal
@I to the battery 0 terminal and terminal @I to the
battery 0 terminal.
Caution
Be very careful when connecting the jumper wires because the relay will be damaged if a mistake is made
with the contact terminals.
(3) With battery
0 terminal jumper wire connected and dis-
connected, measure the voltage at multiport fuel injection
relay terminals @ and 0.
(4) Use jumper wires to connect multiport fuel injection relay
terminal
@I to the battery 0 terminal and terminal @ to the
battery 0 terminal.
(5) Disconnecting the jumper wire on the terminal 0 side of
the battery, check whether or not continuity exists across
terminals
@ and @ of the multiport fuel injection relay.
Continuity between terminals 0-0
(6) Use jumper wires and connect multiport fuel injection relay
terminal
@ to the battery 0 terminal and terminal 0 to the
battery 0 terminal.
(7) With the battery 0 terminal jumper wire connected and
disconnected, measure the voltage at multiport fuel injec-
tion relay terminal
0.
Jumper wireTerminal Voltage @
ConnectionBattery positive voltage
Not connected OV
(8) Replace the multiport fuel injection relay if faulty
ENGINE CONTROL MODULE POWER GRtXJNla
Refer to P.13-45.
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k.
13-258FUEL SYSTEM <DOHC>- On-Vehicle Inspection of MFI Components
FUEL PUMP Fuel pump
check terminal
-I--
-
Ignition switch
[r
Ignition switch [IGI @
Component side
connector @ Harness side
Iconnecto

r
Fuel pump connector
I
,- __ _ /OlAO488
-T
IComponent side
connector
@
h 56 @
Harness side
1
v y
connector
-NC-
lrll
0
1-z
Fuel pump checkA 13 terminal harness
side-1 connector
I Engine
control
module
connector
Engine control module
6FU1295
01 LO838
OPERATION
l
Activates the fuel pump during engine cranking
and while the engine is running.
l When the ignition switch is set to the START
position, the current flows, by way of the multi-
port fuel injection relay coil, from the ignition
switch to ground. As a result, the multiport fuel
injection relay switch is switched ON, and the
power for activation of the fuel pump is sup-
plied, by way of the multiport fuel injection relay
switch, from the battery to the fuel pump.
lWhile the engine is running, the engine control module switches ON the power transistor, after
which current flows to the multiport fuel injec-
tion relay coil, and the power for activation of
the fuel pump is supplied to the fuel pump.
lWhen the multiport fuel injection relay switch is
switched ON, battery voltage is also applied to
the engine control module, and so the engine
control module detects the fact that the power
for activation of the fuel pump is being supplied
to the fuel pump.
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