Mitsubishi Galant (2004+). Manual — part 1077
13B-1
GROUP 13B
MULTIPORT FUEL
INJECTION (MFI)
<3.8L ENGINE>
CONTENTS
GENERAL DESCRIPTION. . . . . . . .
MULTIPORT FUEL INJECTION (MFI)
DIAGNOSIS . . . . . . . . . . . . . . . . . . .
TROUBLESHOOTING STRATEGY . . . . . .
DIAGNOSTIC FUNCTION . . . . . . . . . . . . .
FAIL-SAFE FUNCTION REFERENCE
TABLE. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DIAGNOSTIC TROUBLE CODE CHART . .
SYMPTOM CHART. . . . . . . . . . . . . . . . . . .
DIAGNOSTIC TROUBLE CODE
PROCEDURES. . . . . . . . . . . . . . . . . . . . . .
SYMPTOM PROCEDURES . . . . . . . . . . . .
DATA LIST REFERENCE TABLE . . . . . . .
ACTUATOR TEST REFERENCE TABLE. .
CHECK AT THE POWERTRAIN CONTROL MODULE
(PCM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
INSPECTION PROCEDURE USING AN
OSCILLOSCOPE . . . . . . . . . . . . . . . . . . . .
SPECIAL TOOLS. . . . . . . . . . . . . . .
ON-VEHICLE SERVICE. . . . . . . . . .
COMPONENT LOCATION . . . . . . . . . . . . .
THROTTLE BODY (THROTTLE VALVE AREA)
CLEANING . . . . . . . . . . . . . . . . . . . . . . . . .
FUEL PRESSURE TEST . . . . . . . . . . . . . .
FUEL PUMP CONNECTOR DISCONNECTION (HOW
TO REDUCE PRESSURIZED FUEL LINES)
FUEL PUMP OPERATION CHECK . . . . . .
MULTIPORT FUEL INJECTION (MFI) RELAY AND
THROTTLE ACTUATOR CONTROL MOTOR RELAY
CONTINUITY CHECK. . . . . . . . . . . . . . . . .
FUEL PUMP RELAY CONTINUITY CHECK
INTAKE AIR TEMPERATURE SENSOR
CHECK . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ENGINE COOLANT TEMPERATURE SENSOR
CHECK . . . . . . . . . . . . . . . . . . . . . . . . . . . .
HEATED OXYGEN SENSOR CHECK . . . .
INJECTOR CHECK . . . . . . . . . . . . . . . . . . .
THROTTLE ACTUATOR CONTROL MOTOR
CHECK . . . . . . . . . . . . . . . . . . . . . . . . . . . .
EVAPORATIVE EMISSION PURGE SOLENOID
CHECK . . . . . . . . . . . . . . . . . . . . . . . . . . . .
EVAPORATVE EMISSION VENTILATION SOLENOID
CHECK . . . . . . . . . . . . . . . . . . . . . . . . . . . .
EGR VALVE CHECK. . . . . . . . . . . . . . . . . .
INJECTOR . . . . . . . . . . . . . . . . . . . .
REMOVAL AND INSTALLATION . . . . . . . .
THROTTLE BODY ASSEMBLY . . . .
REMOVAL AND INSTALLATION . . . . . . . .
POWERTRAIN CONTROL MODULE
(PCM) . . . . . . . . . . . . . . . . . . . . . . . .
REMOVAL AND INSTALLATION . . . . . . . .
SPECIFICATIONS . . . . . . . . . . . . . .
FASTENER TIGHTENING
SPECIFICATIONS. . . . . . . . . . . . . . . . . . . .
GENERAL SPECIFICATIONS . . . . . . . . . .
SERVICE SPECIFICATIONS . . . . . . . . . . .
SEALANT AND ADHESIVE . . . . . . . . . . . .
GENERAL DESCRIPTION
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-2
GENERAL DESCRIPTION
M1131000101050
.
The multiport Fuel Injection System consists of sen-
sors which detect the engine conditions, the POW-
ERTRAIN CONTROL MODULE (PCM) which
controls the system based on signals from these
sensors, and actuators which operate under the con-
trol of the PCM.
The PCM carries out activities such as fuel injection
control, idle air control, and ignition timing control.
In addition, the PCM is equipped with several diag-
nostic test modes which simplify troubleshooting
when a problem develops.
.
FUEL INJECTION CONTROL
The injector drive times and injector 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 PCM 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 PCM 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 obtains the maximum
cleaning performance.
.
THROTTLE VALVE OPENING CONTROL
This system electrically controls the opening of the
throttle valve. The PCM 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 PCM 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 passes 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 PCM from engine
speed, intake air volume, engine coolant tempera-
ture, and atmospheric pressure.
.
DIAGNOSTIC TEST MODE
• When an abnormality is detected in one of the
sensors or actuators related to emission control,
the Malfunction Indicator Lamp (SERVICE
ENGINE SOON or Check Engine Lamp) illumi-
nates to warn the driver.
• When an abnormality is detected in one of the
sensors or actuators, a diagnostic trouble code
corresponding to the abnormality is stored in the
PCM.
• The RAM data inside the PCM 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 (MUT-III sub
assembly) under certain circumstances.
.
GENERAL DESCRIPTION
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-3
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.
FAN RELAY CONTROL
• The radiator fan and condenser fan speeds are
controlled in response to the engine coolant tem-
perature and vehicle speed.
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 System −
Evaporative Emission System
− General Descrip-
tion
.)
EGR CONTROL
• (Refer to GROUP 17, Emission Control System −
Exhaust Gas Recirculation (EGR) System - Gen-
eral Description
.)
GENERAL DESCRIPTION
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-4
MULTIPORT FUEL INJECTION (MFI) SYSTEM DIAGRAM
NOTE: For the vacuum routing, refer to GROUP 17, Emission Control System
−
Vacuum Hoses
−
Vacuum
Hose Routing
AK301872
MANIFOLD
ABSOLUTE
PRESSURE
SENSOR
THROTTLE
ACTUATOR
CONTROL
MOTOR
CAMSHAFT
POSITION
SENSOR
LEFT BANK HEATED OXYGEN
SENSOR (FRONT)
FUEL TANK
DIFFERENTIAL
PRESSURE
SENSOR
FUEL TANK
TEMPERATURE
SENSOR
EVAPORATIVE EMISSION
VENTILATION VALVE
FUEL TANK
EVAPORATIVE
EMISSION
CANISTER
3 THROTTLE POSITION SENSOR
(MAIN/SUB)
MASS AIRFLOW
SENSOR
ENGINE
COOLANT
TEMPERATURE
SENSOR
RIGHTBANK
HEATED
OXYGEN
SENSOR
(FRONT)
RIGHT BANK HEATED
OXYGEN SENSOR (REAR)
FUEL PRESSURE
REGULATOR
EVAPORATIVE
EMISSION
VENTILATION
SOLENOID
LEFT BANK HEATED OXYGEN
SENSOR (REAR)
FUEL PUMP
CRANKSHAFT POSITION
SENSOR
FUEL
LEVEL
SENSOR
AIR
INLET
INTAKE AIR TEMPERATURE
SENSOR
EVAPORATIVE
EMISSION
PURGE SOLENOID
INJECTOR
EGR VALVE
(STEPPER MOTOR)
1 MASS AIRFLOW SENSOR
2 INTAKE AIR TEMPERATURE SENSOR
3 THROTTLE POSITION SENSOR (MAIN/SUB)
4 MANIFOLD ABSOLUTE PRESSURE SENSOR
5 ENGINE COOLANT TEMPERATURE SENSOR
6 CAMSHAFT POSITION SENSOR
7 CRANKSHAFT POSITION SENSOR
8 RIGHT BANK HEATED OXYGEN SENSOR (FRONT)
9 RIGHT BANK HEATED OXYGEN SENSOR (REAR)
10 LEFT BANK HEATED OXYGEN SENSOR (FRONT)
11 LEFT BANK HEATED OXYGEN SENSOR (REAR)
12 FUEL TANK DIFFERENTIAL PRESSURE SENSOR
13 FUEL TANK TEMPERATURE SENSOR
14 FUEL LEVEL SENSOR
ACCELERATOR PEDAL POSITION SENSOR
(MAIN/SUB)
KNOCK SENSOR
POWER STEERING PRESSURE SWITCH
OUTPUT SHAFT SPEED SENSOR
TRANSMISSION RANGE SWITCH
GENERATOR FR TERMINAL
IGNITION SWITCH - IG
IGNITION SWITCH - ST
POWER SUPPLY
1 THROTTLE ACTUATOR
CONTROL MOTOR
2 EGR VALVE (STEPPER
MOTOR)
3 INJECTOR
4 EVAPORATIVE EMISSION
PURGE SOLENOID
5 EVAPORATIVE EMISSION
VENTILATION SOLENOID
IGNITION COIL, IGNITION
POWER TRANSISTER
MULTIPORT FUEL
INJECTION (MFI) RELAY
FUEL PUMP RELAY
THROTTLE ACTUATOR
CONTROL MOTOR RELAY
GENERATOR G TERMINAL
HEATED OXYGEN SENSOR
HEATER
FAN CONTROL RELAY
(RADIATOR, A/C CONDENSER)
A/C COMPRESSOR CLUTCH
RELAY
DIAGNOSTIC OUTPUT
PCM (WITH
BAROMETRIC
PRESSURE
SENSOR)
SENSE
DECIDE
ACT
AB
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