Mitsubishi Colt Ralliart. Manual - part 669

 

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Mitsubishi Colt Ralliart. Manual - part 669

 

 

GROUP 13B

MULTIPORT FUEL 

INJECTION (MPI) 

<4G1>

CONTENTS

GENERAL INFORMATION . . . . . . . .

13B-2

SERVICE SPECIFICATIONS. . . . . . .

13B-6

SEALANT. . . . . . . . . . . . . . . . . . . . . .

13B-6

SPECIAL TOOLS. . . . . . . . . . . . . . . .

13B-7

TROUBLESHOOTING . . . . . . . . . . . .

13B-9

DIAGNOSIS TROUBLESHOOTING 

 

FLOW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

13B-9

DIAGNOSIS FUNCTION. . . . . . . . . . . . . . . 

13B-9

INSPECTION CHART FOR 

 

DIAGNOSIS CODES  . . . . . . . . . . . . . . . . . 

13B-18

INSPECTION CHART FOR 

 

TROUBLE SYMPTOMS . . . . . . . . . . . . . . . 

13B-20

INSPECTION PROCEDURE FOR 

 

DIAGNOSIS CODES  . . . . . . . . . . . . . . . . . 

13B-24

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

13B-242

Data List Reference Table  . . . . . . . . . . . . . 

13B-335

Actuator Test Reference Table . . . . . . . . . . 

13B-344

CHECK AT THE ECU TERMINALS . . . . . . 

13B-346

INSPECTION PROCEDURE USING 

 

OSCILLOSCOPE  . . . . . . . . . . . . . . . . . . . . 

13B-352

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

13B-358

THROTTLE BODY (THROTTLE 

 

VALVE AREA) CLEANING . . . . . . . . . . . . . 

13B-358

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

13B-358

FUEL PUMP CONNECTOR 

 

DISCONNECTION (HOW TO REDUCE 
PRESSURIZED LINES)  . . . . . . . . . . . . . . . 

13B-360

FUEL TANK PUMP OPERATION CHECK . 

13B-361

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

13B-362

ENGINE CONTROL RELAY 

 

CONTINUITY CHECK . . . . . . . . . . . . . . . . . 

13B-363

FUEL PUMP RELAY CONTINUITY 

 

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

13B-363

THROTTLE VALVE CONTROL SERVO 

 

RELAY CONTINUITY CHECK  . . . . . . . . . . 

13B-364

INTAKE AIR TEMPERATURE 

 

SENSOR CHECK . . . . . . . . . . . . . . . . . . . . 

13B-364

ENGINE COOLANT TEMPERATURE 

 

SENSOR CHECK . . . . . . . . . . . . . . . . . . . . 

13B-365

OXYGEN SENSOR CHECK . . . . . . . . . . . . 

13B-365

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

13B-367

THROTTLE VALVE CONTROL 

 

SERVO CHECK  . . . . . . . . . . . . . . . . . . . . . 

13B-368

OIL FEEDER CONTROL VALVE CHECK. . 

13B-369

FUEL PRESSURE SOLENOID 

 

VALVE CHECK . . . . . . . . . . . . . . . . . . . . . . 

13B-369

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

13B-370

REMOVAL AND INSTALLATION  . . . . . . . . 

13B-370

THROTTLE BODY ASSEMBLY . . . . .

13B-373

REMOVAL AND INSTALLATION  . . . . . . . . 

13B-373

ENGINE-ECU  . . . . . . . . . . . . . . . . . . .

13B-375

REMOVAL AND INSTALLATION  . . . . . . . . 

13B-375

Main

Index

Group

TOC

GENERAL INFORMATION

MULTIPORT FUEL INJECTION (MPI) <4G1>

13B-2

GENERAL INFORMATION

M1131000102752

The Multipoint Fuel Injection System consists of sen-
sors which detect the engine conditions, the 
engine-ECU which controls the system based on sig-
nals from these sensors, and actuators which oper-
ate under the control of the engine-ECU. The 

engine-ECU carries out activities such as fuel injec-
tion control, idle speed control and ignition timing 
control. In addition, the engine-ECU is equipped with 
several diagnosis modes which simplify trouble-
shooting 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 by the fuel pump, with the pressure being regu-
lated by the fuel pressure regulator. The fuel thus 
regulated 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 1-3-4-2. This is called sequential fuel 
injection. The engine-ECU provides a richer air/fuel 
mixture by carrying out "open-loop" control when the 

engine is cold or operating under high load condi-
tions in order to maintain engine performance. In 
addition, when the engine is warm or operating under 
normal conditions, the engine-ECU controls the 
air/fuel mixture by using the oxygen sensor signal to 
carry out "closed-loop" control in order to obtain the 
theoretical air/fuel mixture ratio that provides the 
maximum cleaning performance from the three way 
catalyst.

THROTTLE VALVE OPENING CONTROL

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

IDLE SPEED 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 engine-ECU drives the throttle valve control 
servo to keep the engine running at the pre-set idle 
target speed in accordance with the engine coolant 
temperature 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 valve 
control servo adjusts the throttle valve passes 
through air amount according to the engine load con-
ditions to avoid fluctuations in the engine speed.

IGNITION TIMING CONTROL

The power transistor located in the ignition primary 
circuit turns ON and OFF to control the primary cur-
rent flow to the ignition coil. This controls the ignition 
timing in order to provide the optimum ignition timing 
with respect to the engine operating conditions. The 
ignition timing is determined by the engine-ECU from 
the engine speed, intake air volume, engine coolant 
temperature and atmospheric pressure.

Main

Index

Group

TOC

GENERAL INFORMATION

MULTIPORT FUEL INJECTION (MPI) <4G1>

13B-3

SELF-DIAGNOSIS FUNCTION

• When an abnormality is detected in one of the 

sensors or actuators related to emission control, 
the engine warning lamp (check engine lamp) 
illuminates as a warning to the driver.

• When an abnormality is detected in one of the 

sensors or actuators, a diagnosis code corre-
sponding to the abnormality is output.

• The RAM data inside the engine-ECU that is 

related to the sensors and actuators can be read 
by means of the M.U.T.-III. In addition, the actua-
tors can be force-driven under certain circum-
stances.

OTHER CONTROL FUNCTIONS

1. Fuel Pump Control

Turns the fuel pump relay ON so that current is sup-

plied to the fuel pump while the engine is crank-
ing or running.

2. A/C Relay Control

Turns the compressor clutch of the A/C ON and OFF.

3. Oil Control Valve Control

The engine-ECU carries out the duty control of the oil 

control valve according to the operation condi-
tion. This varies the phase angle of the intake 
camshaft to optimize the intake valve timing.

4. Fan Motor Control

The revolutions of the radiator fan and condenser fan 

are controlled in response to the engine coolant 
temperature and vehicle speed.

5. Alternator Output Current Control

Prevents alternator output current from increasing 

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

6. Purge Control Solenoid Valve Control

(Refer to 

P.17-13

, GROUP 17 

− Engine And Emis-

sion Control 

− Evaporative Emission Control Sys-

tem).

Main

Index

Group

TOC

GENERAL INFORMATION

MULTIPORT FUEL INJECTION (MPI) <4G1>

13B-4

GENERAL SPECIFICATIONS

Items

Specifications

Throttle body

Throttle bore mm

45

Throttle position sensor

Hall element type

Throttle valve control servo

DC motor type, having broshes

Engine-ECU

Identification No.

E6T45179

Sensors

Barometric pressure sensor

Semiconductor type

Intake air temperature sensor

Thermistor type

Engine coolant temperature sensor

Thermistor type

Oxygen sensor

Zirconia type

Accelerator pedal position sensor

Hall element type

Camshaft position sensor

Magneto resistance element type

Crank angle sensor

Magneto resistance element type

Detonation sensor

Piezoelectric type

Actuators

Engine control relay type

Contact switch type

Fuel pump relay type

Contact switch type

Injector type and number

Electromagnetic type, 4

Injector identification mark

HDB305E

Throttle actuator control motor relay

Contact switch type

Oil feeder control valve

Duty cycle type solenoid valve

Purge control solenoid valve

Duty cycle type solenoid valve

Fuel pressure solenoid valve

ON/OFF type solenoid valve

Waste gate solenoid valve

Duty cycle type solenoid valve

Fuel pressure 
regulator

Regulator pressure kPa

294

Main

Index

Group

TOC

 

 

 

 

 

 

 

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