check engine MITSUBISHI 3000GT 1991 Owners Manual

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.
1 TSB Revision1

FUEL SYSTEM - On-vehicle lnwection of MPI ComDonents13-121
LEGR CONTROL SOLENOID VALVE - Non Turbo, Turbo>MlBYZBAControl relav
EGR control
solenoid valve@ Equipment side
connector
Engine
control
unitEngine control unit connector
7FUO653
OPERATION
lThe EGR control solenoid valve is a duty control type solenoid valve. It makes control by leaking EGR valve
operating negative pressure to the throttle body A port.
lPower supply from the battery is sent through the control relay to the EGR control solenoid valve. When
the engine control unit turns off the power transistor inside the unit, current no more flows through the
coil and EGR valve operating negative pressure leaks.
TROUBLESHOOTING HINTIf the results of EGR control solenoid valve on-vehicle and off-vehicle inspections are normal but the
self-diagnosis code for EGR system failure is displayed, check the EGR valve, vacuum hose and EGR passage
for blocking.
c.
1 TSB Revision

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.
1 TSB Revision

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
TSB Revision

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.
1 TSB Revision

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.
1 TSB Revision

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
1 TSB RevisionI

13-132
IFUEL SYSTEM
- 0
n-vehicle Inspection of MPI Components
HARNESS INSPECTION
Engine control unitharness side connectorCheck for an open-circuit or a short-circuit to ground, between the enginecontrol unit and the variable inductioncontrol servo connector.l
Variable induction control servoconnector: DisconnectedlEngine control unit connector:Disconnected
t
Repair the
harness.
*A7FUO84
ACTUATOR INSPECTIONRefer to GROUP 15.
1 TSB Revision

13-134FUEL SYSTEM - On-vehicle InsDection of MPI ComDonents
INSPECTIONUsing Multi-use Tester
FunctionItem No. Data displayCheck condition. Driving conditionStandard valueData reading 45
Stepper
Engine warmed up
Apply fairly sharp
To reach tempo-motor stepbraking at 50 km/h
rarily 70 to
(4th speed) to100 stepsstop vehicle
NOTESelect a place where a rear-end collision is unlikely.
HARNESS INSPECTION
side connector
Engine control umtharness side connecm
6FU1543
Check for an open-circuit or a short-circuit to ground, between the ABScontrol unit and the engine controlunit.l
ABS control unit connector: Dis-connectedlEngine control unit connector:
Disconnected7Repair the
harness.
(@m-ml)
I
I
I
I
IiI
I
~,
I\
TSB Revision1

13-136FUEL SYSTEM - On-vehicle Inspection of MPI Components
HARNESS INSPECTION
’ IEngine control
unit harness
&;;;;;g;;gconnector
.j/ \%: c.
T
Check for an open-circuit, or a short-circuit to ground between the transax-’le control unit and the engine controlunit,
lTransaxle control unit connector:
Disconnected
lEngine control unit connector:
Disconnected
c----JOK
Repair the
harness.
C@pJ- 11161)
*6FU1543Engine control
unit harness
control
?ss side
6FU1543
-I3@ Transaxle control
unit harness sideEngine control
unit harness
side connector
6FU1543
Check for an open-circuit, or a short-circuit to ground between the transax-le control unit and the engine control-unit.
lTransaxle control unit connector:
Disconnected
lEngine control unit connector:
DisconnectedRepair the
harness.
@pJ-gj,
Check for an open-circuit, or a short-circuit to ground between the transax-
le control unit and the engine control
unit.
lTransaxle control unit connector:
Disconnected
lEngine control unit connector:
DisconnectedRepair the-+ harness.
@ml -FJ)
1 TSB Revision