Mitsubishi Galant. Manual — part 80
13-1
GROUP 13
CONTENTS
MULTIPORT FUEL INJECTION (MFI) <2.4L> . . . . . . . . . . . . . .
MULTIPORT FUEL INJECTION (MFI) <3.0L> . . . . . . . . . . . . . .
FUEL SUPPLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
13A-2
GROUP 13A
CONTENTS
GENERAL DESCRIPTION. . . . . . . . .
MULTIPORT FUEL INJECTION(MFI)
DIAGNOSIS . . . . . . . . . . . . . . . . . . . .
TROUBLESHOOTING STRATEGY . . . . . .
TROUBLE CODE DIAGNOSIS. . . . . . . . . .
FAIL-SAFE/BACKUP FUNCTION TABLE .
DIAGNOSTIC TROUBLE CODE CHART . .
SYMPTOM CHART. . . . . . . . . . . . . . . . . . .
DATA LIST REFERENCE TABLE . . . . . . .
ACTUATOR TEST REFERENCE TABLE. .
CHECK AT THE POWERTRAIN CONTROL
MODULE (PCM) . . . . . . . . . . . . . . . . . . . .
INSPECTION PROCEDURE USING A
OSCILLOSCOPE . . . . . . . . . . . . . . . . . . . .
SPECIAL TOOLS. . . . . . . . . . . . . . . .
ON-VEHICLE SERVICE. . . . . . . . . . .
COMPONENT LOCATION . . . . . . . . . . . . .
THROTTLE BODY (THROTTLE VALVE AREA)
CLEANING . . . . . . . . . . . . . . . . . . . . . . . . .
THROTTLE POSITION SENSOR ADJUSTMENT
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
BASIC IDLE SPEED ADJUSTMENT . . . . .
FUEL PRESSURE TEST . . . . . . . . . . . . . .
FUEL PUMP CONNECTOR DISCONNECTION
(HOW TO REDUCE PRESSURIZED FUEL LINES)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
FUEL PUMP OPERATION CHECK . . . . . .
MULTIPORT FUEL INJECTION (MFI) RELAY AND
FUEL PUMP RELAY CONTINUITY CHECK
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
INTAKE AIR TEMPERATURE SENSOR CHECK
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ENGINE COOLANT TEMPERATURE SENSOR
CHECK . . . . . . . . . . . . . . . . . . . . . . . . . . . .
THROTTLE POSITION SENSOR CHECK .
HEATED OXYGEN SENSOR CHECK . . . .
INJECTOR CHECK . . . . . . . . . . . . . . . . . . .
IDLE AIR CONTROL MOTOR (STEPPER MOTOR)
CHECK . . . . . . . . . . . . . . . . . . . . . . . . . . . .
EVAPORATIVE EMISSION PURGE SOLENOID
CHECK . . . . . . . . . . . . . . . . . . . . . . . . . . . .
EGR SOLENOID CHECK . . . . . . . . . . . . . .
INJECTOR . . . . . . . . . . . . . . . . . . . . .
REMOVAL AND INSTALLATION . . . . . . . .
THROTTLE BODY ASSEMBLY . . . . .
REMOVAL AND INSTALLATION . . . . . . . .
DISASSEMBLY AND ASSEMBLY . . . . . . .
SPECIFICATIONS . . . . . . . . . . . . . . .
FASTENER TIGHTENING SPECIFICATIONS
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
GENERAL SPECIFICATIONS . . . . . . . . . .
SERVICE SPECIFICATIONS . . . . . . . . . . .
SEALANT AND ADHESIVE . . . . . . . . . . . .
GENERAL DESCRIPTION
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-3
.
G EN ER A L DESC RIPTIO N
M1131000100109
The Multiport Fuel Injection System consists of
sensors, actuators and the powertrain control
module (PCM). The sensors detect the engine
condition. The module controls the system based on
signals from these sensors. The actuators work
under the control of the PCM. The PCM carries out
activities such as fuel injection control, idle air
control, and ignition timing control. In addition, the
PCM has several diagnostic test modes which
simplify troubleshooting when a problem develops. In
addition, the PCM is equipped with several
diagnostic test modes which simplify troubleshooting
when a problem develops.
FUEL INJECTION CONTROL
The PCM controls injector drive times and injector
timing to supply the optimum air/fuel mixture to the
engine according to the continually-changing engine
operation conditions. A single injector is mounted at
the intake port of each cylinder. The fuel pump
supplies pressurized fuel from the fuel tank to the
fuel injectors. The fuel pressure regulator controls
the fuel pressure. Thus, the regulated fuel is
distributed to each injector. Fuel is normally injected
for each cylinder every two rotations of the
crankshaft. The firing order is 1-3-4-2. Each cylinder
has a dedicated fuel injector. This is called
"multiport." The PCM provides a richer air/fuel
mixture by carrying out "open-loop" control when the
engine is cold or running under high load conditions.
Thus, engine performance is maintained. In addition,
when the engine is under normal operating
temperature after warming-up, the PCM controls the
air/fuel mixture according to the heated oxygen
sensor signal. This control is a "closed-loop" control.
The closed-loop control achieves the theoretical air/
fuel mixture ratio where the catalytic converter can
obtain the maximum cleaning performance.
IDLE AIR CONTROL
The engine control module controls the amount of air
that bypasses the throttle valve according to
changes in idling conditions and engine load during
idling. Thus, idle speed is kept at an optimum speed.
The PCM drives the idle air control (IAC) motor
according to engine coolant temperature, A/C, and
other electrical load. Thus, idle speed is kept at an
optimum speed. In addition, when the air
conditioning switch is turned off and on while the
engine is idling, the IAC motor adjusts the throttle
valve bypass air amount. Thus, idle speed is
maintained at constant speed regardless of various
engine load conditions.
IGNITION TIMING CONTROL
The ignition power transistor located in the ignition
primary circuit turns on and off to control primary
current flow to the ignition coil. This maintains
ignition timing at an optimum level regardless of
various engine operating conditions. The PCM
determines the ignition timing according to engine
speed, intake air volume, engine coolant
temperature, and atmospheric pressure.
DIAGNOSTIC TEST MODE
•
When a fault is detected in any of the sensors or
actuators related to emission control, the
SERVICE ENGINE SOON/MALFUNCTION
INDICATOR LAMP illuminates to warn the driver.
•
When a fault is detected in one of the sensors or
actuators, a diagnostic trouble code
corresponding to the fault 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
controlled by the scan tool MUT-II (MB991502)
under certain circumstances.
OTHER CONTROL FUNCTIONS
1. Fuel Pump Control Turns on the fuel pump relay
so that current is supplied to the fuel pump while
the engine is cranking or running.
2. A/C Compressor Clutch Relay Control Turns on
and off the air conditioning compressor clutch.
3. Evaporative Emission Purge Control (Refer to
GROUP 17, Emission Control System
−
Evaporative Emission Control System
−
General
Information.
4. EGR Control (Refer to GROUP 17, Emission
Control System
−
Exhaust Gas Recirculation
(EGR) System
−
General Information.
GENERAL DESCRIPTION
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-4
MULTIPORT FUEL INJECTION (MFI) SYSTEM DIAGRAM
NOTE: For the vacuum hose routing, refer to
GROUP 17, Vacuum Hoses
AK000583
A
E
1 HEATED OXYGEN SENSOR (FRONT)
2 VOLUME AIR FLOW SENSOR
3 INTAKE AIR TEMPERATURE SENSOR
4 THROTTLE POSITION SENSOR
5 CAMSHAFT POSITION SENSOR
6 CRANKSHAFT POSITION SENSOR
7 BAROMETRIC PRESSURE SENSOR
8 ENGINE COOLANT TEMPERATURE SENSOR
9 HEATED OXYGEN SENSOR (REAR)
10 MANIFOLD DIFFERENTIAL PRESSURE SENSOR
11 FUEL TANK DIFFERENTIAL PRESSURE SENSOR
POWER SUPPLY
VEHICLE SPEED SENSOR
A/C SWITCH
PARK/NEUTRAL POSITION SWITCH
POWER STEERING PRESSURE SWITCH
IGNITION SWITCH - ST
1 INJECTOR
2 EVAPORATIVE EMISSION
PURGE SOLENOID
3 IDLE AIR CONTROL MOTOR
4 EGR SOLENOID
5 EVAPORATIVE EMISSION
VENTILATION SOLENOID\
FUEL PUMP RELAY
MULTIPORT FUEL INJECTION
(MFI) RELAY
A/C COMPRESSER CLUTCH RELAY
SERVICE ENGINE SOON/
MALFUNCTION INDICATOR LAMP
DIAGNOSTIC OUTPUT
IGNITION COIL,
IGNITION POWER TRANSISTER
PCM
SENSE
DECIDE
ACT
AIR INLET
3 INTAKE AIR
TEMPERATURE SENSOR
3 IDLE AIR
CONTROL
MOTOR
7, 2
VOLUME AIR FLOW SENSOR
(WITH BAROMETRIC
PRESSURE SENSOR)
11 FUEL TANK
DIFFERENTIAL
PRESSURE
SENSOR
EVAPORATIVE
EMISSION
CANISTER
FUEL TANK
5 EVAPORATIVE
EMISSION
VENTILATION
SOLENOID
2 EVAPORATIVE
EMISSION
PURGE
SOLENOID
4 EGR
SOLENOID
4 THROTTLE POSITION
SENSOR
MANIFOLD
DIFFERENTIAL
PRESSURE
SENSOR
10
EGR
VALVE
VACUUM
CONTROL
VALVE
M*1
*2
FROM
FUEL
PUMP
TO
FUEL
TANK
FUEL
PRESSURE
REGULATOR
1
8
INJE-
CTOR
5 CAMSHAFT
POSITION
SENSOR
ENGINE COOLANT
TEMPERATURE
SENSOR
1 HEATED OXYGEN SENSOR (FRONT)
6 CRANK SHAFT
POSITION SENSOR
9 HEATED OXYGEN SENSOR (REAR)
NOTE
*1 : Manifold port
*2 : Restrictor
AB
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