Mitsubishi Outlander GS45X. Manual — part 767

13B-1

GROUP 13B

MULTIPORT FUEL

INJECTION (MFI)

<3.0L ENGINE>

CONTENTS

GENERAL INFORMATION . . . . . . . .

13B-3

GENERAL SPECIFICATIONS . . . . . .

13B-6

SERVICE SPECIFICATIONS. . . . . . .

13B-7

SEALANT AND ADHESIVE. . . . . . . .

13B-7

SPECIAL TOOL . . . . . . . . . . . . . . . . .

13B-8

MULTIPORT FUEL INJECTION (MFI)
DIAGNOSIS . . . . . . . . . . . . . . . . . . . .

13B-10

TROUBLESHOOTING STRATEGY . . . . . .

13B-10

DIAGNOSTIC FUNCTION . . . . . . . . . . . . .

13B-11

FAIL-SAFE FUNCTION REFERENCE

TABLE. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

13B-48

DIAGNOSTIC TROUBLE CODE CHART . .

13B-50

SYMPTOM CHART . . . . . . . . . . . . . . . . . . .

13B-55

DIAGNOSTIC TROUBLE CODE

PROCEDURES . . . . . . . . . . . . . . . . . . . . . .

13B-58

SYMPTOM PROCEDURES . . . . . . . . . . . .

13B-750

DATA LIST REFERENCE TABLE. . . . . . . .

13B-836

GENERAL SCAN TOOL (GST) MODE 01
REFERENCE TABLE . . . . . . . . . . . . . . . . .

13B-853

ACTUATOR TEST REFERENCE TABLE . .

13B-858

CHECK AT THE ENGINE CONTROL MODULE

(ECM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

13B-860

INSPECTION PROCEDURE USING AN
OSCILLOSCOPE . . . . . . . . . . . . . . . . . . . .

13B-868

Continued on next page

13B-2

ON-VEHICLE SERVICE. . . . . . . . . . .

13B-877

COMPONENT LOCATION . . . . . . . . . . . . .

13B-877

THROTTLE BODY (THROTTLE VALVE AREA)
CLEANING . . . . . . . . . . . . . . . . . . . . . . . . .

13B-882

FUEL PRESSURE TEST . . . . . . . . . . . . . .

13B-883

FUEL PUMP CONNECTOR DISCONNECTION

(HOW TO REDUCE PRESSURIZED FUEL

LINES). . . . . . . . . . . . . . . . . . . . . . . . . . . . .

13B-886

FUEL TANK PUMP OPERATION CHECK .

13B-886

MULTIPORT FUEL INJECTION (MFI) RELAY
CONTINUITY CHECK. . . . . . . . . . . . . . . . .

13B-886

FUEL PUMP RELAY CONTINUITY

CHECK . . . . . . . . . . . . . . . . . . . . . . . . . . . .

13B-887

INJECTOR RELAY AND THROTTLE ACTUATOR
CONTROL MOTOR RELAY CONTINUITY

CHECK . . . . . . . . . . . . . . . . . . . . . . . . . . . .

13B-888

INTAKE AIR TEMPERATURE SENSOR

CHECK . . . . . . . . . . . . . . . . . . . . . . . . . . . .

13B-888

ENGINE COOLANT TEMPERATURE SENSOR
CHECK . . . . . . . . . . . . . . . . . . . . . . . . . . . .

13B-889

HEATED OXYGEN SENSOR CHECK . . . .

13B-889

INJECTOR CHECK . . . . . . . . . . . . . . . . . . .

13B-894

THROTTLE ACTUATOR CONTROL MOTOR

CHECK . . . . . . . . . . . . . . . . . . . . . . . . . . . .

13B-894

ENGINE OIL CONTROL VALVE CHECK . .

13B-895

EVAPORATIVE EMISSION PURGE SOLENOID
CHECK . . . . . . . . . . . . . . . . . . . . . . . . . . . .

13B-896

EVAPORATIVE EMISSION VENTILATION
SOLENOID CHECK . . . . . . . . . . . . . . . . . .

13B-896

EGR VALVE CHECK. . . . . . . . . . . . . . . . . .

13B-896

INJECTOR . . . . . . . . . . . . . . . . . . . . .

13B-897

REMOVAL AND INSTALLATION . . . . . . . .

13B-897

THROTTLE BODY ASSEMBLY . . . . .

13B-901

REMOVAL AND INSTALLATION . . . . . . . .

13B-901

ENGINE CONTROL MODULE (ECM)

13B-903

REMOVAL AND INSTALLATION . . . . . . . .

13B-903

GENERAL INFORMATION

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-3

GENERAL INFORMATION

M1131000105085

.

The Multiport Fuel Injection System consists of sen-
sors which detect the engine conditions, the ENGINE
CONTROL MODULE (ECM) which controls the sys-
tem based on signals from these sensors, and actua-
tors which operate under the control of the ECM.
The ECM carries out activities such as fuel injection
control, idle air control, and ignition timing control.
In addition, the ECM is equipped with several diag-
nostic test modes which simplify troubleshooting
when a problem develops.

.

FUEL INJECTION CONTROL

The injector drive times and injection timing are con-
trolled so that the optimum air/fuel mixture is sup-
plied to the engine to correspond to the
continually-changing engine operation conditions.
A single injector is mounted at the intake port of each
cylinder. Fuel is sent under pressure from the fuel
tank to the fuel injectors by the fuel pump, with the
pressure being regulated by the fuel pressure regula-
tor. The regulated fuel is distributed to each of the
injectors.
Fuel injection is normally carried out once for each
cylinder for every two rotations of the crankshaft.
The firing order is 1-2-3-4-5-6. Each cylinder has a
dedicated fuel injector. This is called multiport.
The ECM provides a richer air/fuel mixture by carry-
ing out "open-loop" control when the engine is cold
or operating under high load conditions in order to
maintain engine performance.In addition, when the
engine is under normal operating temperature after
warming-up, the ECM controls the air/fuel mixture by
using the heated oxygen sensor signal to carry out
"closed-loop" control. The closed-loop control
achieves the theoretical air/fuel mixture ratio where
the catalytic converter can obtain the maximum
cleaning performance.

.

THROTTLE VALVE OPENING CONTROL

This system electrically controls the opening of the
throttle valve. The ECM detects the amount of travel
of the accelerator pedal via the accelerator pedal
position sensor, and controls the actuation of the
throttle actuator control motor, which is mounted on
the throttle body, in order to attain the target throttle
valve opening that has been predetermined in accor-
dance with driving conditions.

.

IDLE AIR CONTROL

The idle speed is kept at the optimum speed by con-
trolling the amount of air that passes through the
throttle valve in accordance with changes in idling
conditions and engine load during idling.
The ECM drives the throttle actuator control motor to
keep the engine running at the pre-set idle target
speed in accordance with the engine coolant temper-
ature and A/C and other electrical load. In addition,
when the air conditioning switch is turned off and on
while the engine is idling, the throttle actuator control
motor adjusts the throttle valve pass-through air
amount according to the engine load conditions to
avoid fluctuations in the engine speed.

.

IGNITION TIMING CONTROL

The ignition power transistor located in the ignition
primary circuit turns ON and OFF to control the pri-
mary current flow to the ignition coil. This controls the
ignition timing to provide the optimum ignition timing
with respect to the engine operating conditions. The
ignition timing is determined by the ECM from engine
speed, intake air volume, engine coolant tempera-
ture, and atmospheric pressure.

.

DIAGNOSTIC TEST MODE

• When a fault is detected in one of the sensors or

actuators related to emission control, the Mal-
function Indicator Lamp (SERVICE ENGINE
SOON or Check Engine Lamp) illuminates to
warn the driver.

• When a fault is detected in one of the sensors or

actuators, a diagnostic trouble code correspond-
ing to the fault is stored in the ECM.

• The RAM data inside the ECM that is related to

the sensors and actuators can be read with the
scan tool. In addition, the actuators can be con-
trolled by scan tool MB991958 (M.U.T.-III sub
assembly) under certain circumstances.

.

GENERAL INFORMATION

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-4

OTHER CONTROL FUNCTIONS

Fuel Pump Control

• Turns the fuel pump relay ON so that current is

supplied to the fuel pump while the engine is
cranking or running.

A/C Compressor Clutch Relay Control

• Turns the compressor clutch of the A/C ON and

OFF.

Generator Output Current Control

• Prevent generator output current from increasing

suddenly and idle speed from dropping at times
such as when the headlights are turned on.

Evaporative Emission Purge Control

• (Refer to GROUP 17, Emission Control − Evapo-

rative Emission Control System

− General Infor-

mation (Evaporative Emission System)

P.17-75

.)

EGR Control

• (Refer to GROUP 17, Emission Control −

Exhaust Gas Recirculation (EGR) System

− Gen-

eral Information (Exhaust Gas Recirculation Sys-
tem)

P.17-80

.)