ignition MITSUBISHI 3000GT 1991 Repair Manual

FUEL SYSTEM - On-vehicle Inspection of MPI Components13-119PURGE CONTROL SOLENOID VALVE
Q Harness side
connector
I
Control relay
@ Equipment side
connector connector
unit
OlAO324
Engine control unit connector
7FUO653OPERATION
lThe purge control solenoid valve is an ON-OFF type one which controls introduction of purge air from the
canister into the intake air plenum.
lThe battery power is supplied to the purge control solenoid valve through the control relay. When the
engine control unit turns ON the power transistor in the unit, current flows to the coil, introducing purge
air.
INSPECTION
Using Multi-use Tester
Function
Actuator testItem No.Drive content
Check conditionNormal state
08Solenoid valve from OFFIgnition switch: ONOperating sound is heard
to ONwhen driven
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13-120FUEL SYSTEM - On-vehicle Inspection of MPI Components
HARNESS INSPECTION
@ Harness side
connector
T7FUO525
I -connector57FUO526
1
Measure the power supply voltage.
l Connector: Disconnected0 Ignition switch: ON
Check for an open-circuit, or a short-circuit to ground between the purgecontrol solenoid valve and the engine
control unit,
lEngine control unit connector:
Disconnected@-+A
lPurge control solenoid valve con-nector: DisconnectedRepair the
harness.

ACTUATOR INSPECTIONRefer to GROUP 17
- Evaporative Emission Control System.
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13-122FUEL SYSTEM - On-vehicle Inspection of MPI Components
INSPECTIONUsing Multi-use Tester
Function
Actuator testItem No.
Drive content
Check condition
Normal state
10Change solenoid valve
from OFF to ON stateIgnition switch: ONOperating sound is heardwhen driven
HARNESS INSPECTION
1
@ Harness side
connector
Measure the power supply voltage.
Y01105*4Engine control unit
harness side connector
Control relay)
Repair the
-S harness.C@vJ-~)
d
Ls
ACTUATOR INSPECTIONRefer to GROUP 17
- Exhaust Gas Recirculation (EGR) System.
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13-124FUEL SYSTEM -On-vehicle Inspection of MPI Components
INSPECTIONUsing Multi-use tester
Function
Actuator testItem No.Drive content
Check conditionNormal state
09Turn solenoid valve fromIgnition switch: ONOFF to ONr%;reard when
HARNESS INSPECTION
@ Harness side
connector
Measure the power supply voltage.
l Connector: Disconnectedl Ignition switch: ON
Voltage
(V)2-* q
SVRepair thei* harness.(@m - Con-
trol relay)
7FUO527
Check for an open-circuit, or a short-circuit to ground, between the fuelpressure control solenoid valve andthe engine control unit.
lEngine controLunit connector:
Disconnected
lFuel pressure control valve con-nector: Disconnected
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FUEL SYSTEM - On-vehicle Inspection of MPI Components'13-127
INSPECTIONUsing Multi-use tester
LFunctionItem No.Drive contentCheck conditionNormal state
Actuator test12
Turn solenoid valve fromIgnition switch: ONOFF to ON
CliZli~,“eard when
HARNESS INSPECTION
Measure the power supply voltage.
l Connector: Disconnectedl Ignition switch: ON
trol relay)
7FUO525
Check for an open-circuit, or a short-circuit to ground, between the wastegate control solenoid valve and the
engine control unit.
lWaste gate control solenoid valveconnector: DisconnectedlEngine control unit connector:
DisconnectedRepair the
-+ harness.
(@m- ml)
7FUO526
ACTUATOR INSPECTIONRefer to GROUP 15.
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13-128FUEL SYSTEM - On-vehicle Inspection of MPI Components
BOOST METER
Ignition switch
(IG,)@ Equipment side
connector
Boost
meter
Engine
control
unit
111
i-F7FUO985
Engine control unit connector
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FUEL SYSTEM - On-vehicle Inspection of MPI Components13-129
i
HARNESS INSPECTION@ Harness side connector
*7FUO986Engine control unit
harness side
connect0r
1
Measure the power supply voltage.l Connector: Disconnected
l Ignition switch: ON
Voltage
(V)
svRepair the
harness.
(@I@-- Ini-tion coil9IG])
Check for an open-circuit or a short-circuit to ground, between the engine
control unit and the boost meter.
Boost meter connector: Discon-
nectedEngine control unit connector:Disconnected
ACTUATOR INSPECTIONRefer to GROUP 54.
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FUEL SYSTEM - On-vehicle lnwection of MPI ComDonents13-131
iVARIABLE INDUCTION CONTROL SERVO (DC MOTOR) Variable induction control servo
Y(DC motor)(with built-in induction/-control valve oosition sensor)-7Fllfl807Engine control unit
Close
connector
,\ IOpen@ Equipmentside1,,I2DC motorVariable
induction
control
servo
1 FU0646
Engine control unit connector
7FUO653
OPERATION
lAs the DC motor is driven clockwise or counterclockwise by the signal from the engine control unit, the
variable induction valve opens or closes.
lThe DC motor is driven clockwise or counterclockwise as the direction of current flow is changed by the
motor drive
IC in the engine control unit.
INSPECTIONUsing Multi-use tester
Function
Actuator testItem No.Drive content
Check conditionNormal state
11Drive the variable induc-Ignition switch: ONTurn the variable inductiontion control (MC) servovalve shaft (Variable induc-
(Open and close the
vari-tion valve: FULL CLOSEable induction valve)+ FULL OPEN
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FUEL SYSTEM - Orwehicle lnwection of MPI Components.13-137Fuel gauge cover
03FOOO4
j check terminal ----T( 04~oo1,/RELEASE OF RESIDUAL PRESSURE FROM HIGH
PRESSURE FUEL HOSEM13FGAIMake the following operations to release the pressure remain-
ing in fuel pipe line so that fuel will not flow out.
(I) Remove the fuel gauge cover in the luggage compartment.
(2) Disconnect the fuel pump harness connector.
(3) Start the engine and after it stops by itself, turn the ignition
switch to OFF.
(4) Connect the fuel pump harness connector.
(5) Apply the specified sealant to the rear floor pan.
Specified sealant: 3M ATD Part No. 8509 or equivalent
(6) Install the fuel gauge cover.
FUEL PUMP OPERATION CHECK
M13FDAI
(1) Set the ignition switch at OFF.
(2) Check that when the battery voltage is directly applied to
the fuel pump check terminal (black), the operating sound
of the pump can be heard.
NOTESince the fuel pump is installed in the fuel
.tank, its
operating sound cannot be readily heard. Remove the fuel
tank cap and listen to the operating sound through the filter
port.
(3) Hold the high pressure fuel hose between your fingers and
check that the fuel pressure can be felt.
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13-156ENGINE CONTROL - Service Adjustment Procedures
SERVICE ADJUSTMENT PROCEDURES
M13FBCKIACCELERATOR CABLE INSPECTION AND
a ’ADJUSTMENT
For models equipped with the cruise control system, refer to
P. 13-l 58.(1) Turn air conditioner and lights OFF.
Inspect and adjust at no load.
(2) Warm engine until stabilized at idle.
(3) Confirm idle speed is at prescribed rpm.
(4) Stop engine (ignition switch OFF).
(5) Confirm there are no sharp bends in accelerator cable.
(6) Check inner cable for correct slack.
(7) If there is too ‘much slack or no slack, adjust play by the
following procedures.@ Turn the ignition switch to the ON position (without
starting the engine) and leave in that condition for
approximately 15 seconds.@Loosen the adjusting bolts on the air intake plenum, and
then secure the outer cable so that the free play of
th,einner cable will be the standard value.
Standard value:
1 - 2 mm (.04 - .08 in.)3-5 mm
(.12-.20 in.)
NOTE
\JIf there is excessive play of the accelerator cable, the
vehicle speed drop (“undershoot”) when climbing a slope
will be large.
If there is no play (excessive tension) of the accelerator
cable, the idling speed will increase.
(8) After adjusting, confirm that throttle valve fully opens and
closes by operating pedal.
(9) Adjust accelerator cable play and confirm throttle lever
stopper touches the fixed SAS.
ACCELERATOR SWITCH INSPECTION AND
A
nADJUSTMENTMlBFlBC
09FO117Make sure that when the accelerator pedal is free, there is
;$ustingcontinuity between the terminals of the accelerator switch and
/that when the pedal is pressed until the indicated pedal stroke
A reaches the standard value, there is no continuity between
the terminals of the switch.
Standard value:Accelerator switch switching point
2 - 6 mm (.079 - .24 in.)If stroke A is out of specification, adjust with adjusting bolt.
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