Ignition control MITSUBISHI COLT 2006 Service User Guide

GENERAL INFORMATION
MULTIPOINT FUEL INJECTION (MPI) <4A9>13A-6
List of Component Functions
NameFunction
ECU
Engine-ECU or engine-CVT-ECU The signals that are input by the sensors enable the
actuators to be controlled in accordance with the
driving conditions.
Sensors
Ignition switch-IGThis signal indicates the ON/OFF condition of the
ignition switch. When this signal is input, the
engine-ECU or engine-CVT-ECU
supplies power to the crank angle sensor, camshaft
position sensor, etc.
Ignition switch-STThis signal indicates that the engine is cranking.
Based on this signal, the engine-ECU or
engine-CVT-ECU controls the fuel injection,
throttle valve position, and the injection timing that
are suited for starting the engine.
Manifold absolute pressure sensor Uses a pressure conversion element to detect the
pressure in the intake manifold, converts it into a
voltage signal, and outputs it to the
engine-ECU or engine-CVT-ECU. The
engine-ECU or engine-CVT-ECU
optimally corrects the fuel injection amount and the
like based on this signal.
Oxygen sensor This sensor, which contains zirconia and platinum
electrodes, detects the level of oxygen concentration
in the exhaust gases. The engine-ECU or
engine-CVT-ECU determines whether the
air-fuel ratio is at the optimal stoichiometric ratio in
accordance with this oxygen concentration level.
Barometric pressure sensorThis sensor detects the altitude of the vehicle. It
enables the engine-ECU or engine-CVT-ECU
to make fuel injection volume corrections in
order to achieve an appropriate air-fuel ratio.
Intake air temperature sensorThis sensor, which contains a thermistor, detects the
temperature of the intake air. The engine-ECU
or engine-CVT-ECU makes fuel injection
volume corrections that suit the intake air
temperature, in accordance with the voltage that is
output by this sensor.
Engine coolant temperature sensorThis sensor, which contains a thermistor, detects the
temperature of the engine coolant. The engine-ECU
or engine-CVT-ECU determines the
warm-up condition of the engine in accordance with
the voltage that is output by this sensor, in order to
control the fuel injection volume, idle speed, and
ignition timing.

GENERAL INFORMATION
MULTIPOINT FUEL INJECTION (MPI) <4A9>13A-7
Throttle position sensor This sensor detects the position of the throttle valve
and inputs it into the engine-ECU or
engine-CVT-ECU . Based on the voltage that
is output by this sensor, the engine-ECU or
engine-CVT-ECU effects throttle valve
feedback control.
Accelerator pedal position sensor This sensor detects the position of the accelerator
and inputs it into the engine-ECU or
engine-CVT-ECU . Based on the voltage that
is output by this sensor, which determines the
accelerator position (and the intention of the driver),
the engine-ECU or engine-CVT-ECU
effects appropriate fuel injection and throttle valve
position controls.
Camshaft position sensorThis sensor detects the top-dead-center (TDC) of the
compression stroke of each cylinder.
Crank angle sensorThis sensor detects the crank angle and inputs it into
the engine-ECU or engine-CVT-ECU .
The engine-ECU or engine-CVT-ECU
effects injector control and other controls in
accordance with the signals received from this
sensor.
Detonation sensorThis sensor, which contains a piezoelectric element,
detects the vibration of the cylinder block that results
from knocking. The engine-ECU or
engine-CVT-ECU detects only the knocking
of the engine from these vibrations, in order to retard
the ignition timing in accordance with the strength of
the knocks.
Alternator FR terminalThis terminal is used for detecting the duty cycle ratio
that energizes the alternator field coil.
Inhibitor switch This is a contact point type switch that inputs a signal
into the engine-CVT-ECU to determine whether the
shift lever is in the neutral position.
Stop lamp switchThis is a contact point type switch that detects how
the brake pedal is depressed.
Actuators
Engine control relayThis relay turns ON and OFF the engine-ECU
or engine-CVT-ECU power circuit.
Throttle valve control servo relayThis relay turns ON and OFF the actuation power
circuit for the throttle valve control servo in the
engine-ECU or engine-CVT-ECU .
InjectorThe injectors inject fuel in accordance with the
injection signals received from the engine-ECU
or engine-CVT-ECU .
Ignition coil (with power transistor)Applies ignition coil primary current intermittently in
accordance with the ignition signals received from
the engine-ECU or engine-CVT-ECU ,
in order to generate high voltage for ignition.
Name Function

FUEL INJECTION CONTROL
MULTIPOINT FUEL INJECTION (MPI) <4A9>13A-9
FUEL INJECTION CONTROL
M2132003000840
This control system is basically the same as that of
the 4G1-Non-Turbo engine used in the COLT.
System Configuration Diagram
AK600487
Catalytic
converterInjector
From fuel
pump
AB
Manifold absolute pressure sensor
Engine-ECU
or
Engine-CVT-
ECU Barometric pressure sensor
Intake air temperature sensor
Engine coolant temperature sensor
Throttle position sensor
Accelerator pedal position sensor Detonation sensor
Camshaft position sensor Crank angle sensor
Ignition switch-ST Oxygen sensor (front)
Oxygen sensor (rear)

IGNITION TIMING AND DISTRIBUTION CONTROL
MULTIPOINT FUEL INJECTION (MPI) <4A9>13A-11
IGNITION TIMING AND DISTRIBUTION CONTROL
M2132005000750
This control system is basically the same as that of
the 4G1-Non-Turbo engine used in the COLT.
System Configuration Diagram
AK402031
Ignition switch-IG
Ignition
coil Battery
Spark plug
Cylinder No. 1 2 3 4
Manifold absolute
pressure sensor
Intake air temperature sensor
Barometric pressure sensor
Engine coolant
temperature sensor
Camshaft position sensor
Crank angle sensor
Detonation sensor
Ignition switch-ST
Engine-ECU
or Engine-
CVT-ECU
AG
OTHER CONTROL FUNCTI O NS
M21320100 0059 6
The following co ntrols are b a sically t he sa me a s
those
of the 4G1 - No n
−turbo eng ine u s ed in the
CO
L
T
.
•ENGINE CONTROL RELA Y CONTROL
•THROTTLE VA L V E C O NTROL SER VO R E LA Y
CONTROL
•MIVEC (Mitsub i sh i Inno vative V a lve T i ming Elec-
tronic Con t rol System)
•FUEL PUMP RELA Y CONTROL
•OXYGEN S E NSOR HEA T E R CONTR O L
•A/C RELAY CONTROL
•ALTER N A T OR CONTROL

FAN RELAY CONTROL
MULTIPOINT FUEL INJECTION (MPI) <4A9>13A-12
FAN RELAY CONTROL
M2132026400117
M
AK402032
OFFON ON
OFF
Engine coolant temperature sensor
Accelerator pedal position sensor Crank angle sensor
Engine-ECU or
Engine-CVT-ECU
Battery
Ignition
switch-IG
Cooling fan
control relay
Cooling fan
control relay A/C switch
AD
A/C switchVehicle speedEngine coolant
temperaturePower transistorFan operation
OFF80 km/h or lessApproximately 96°C
or moreONRotated
Approximately 96°C
or lessOFFStopped
80 km/h or moreApproximately
105
°C or more
ONRotated
Approximately
105
°C or less
OFFStopped
ON−−ONRotated

DIAGNOSIS SYSTEM
MULTIPOINT FUEL INJECTION (MPI) <4A9>13A-14
DIAGNOSIS SYSTEM
M2132009000882
Engine-ECU or engine-CVT-ECU has
been provided with the following functions for easier
system inspection.FREEZE-FRAME DATA
When the engine-ECU or engine-CVT-ECU
detects a problem and stores the resulting
diagnosis code, the engine condition at that time is
also memorized. The M.U.T.-III can then be used to
analyze this data in order to increase the effective
-
ness of troubleshooting. The freeze-frame data dis-
play items are given below.
Item No.DataUnit
13Intake air temperature sensor°C
21Engine coolant temperature sensor°C
22Crank angle sensorr/min
24Vehicle speed sensorkm/h
32Manifold absolute pressure sensorkPa
44Ignition advancedeg
81Long-term fuel compensation%
82Short-term fuel compensation%
87Calculated load value%
88Fuel control conditionOpen loopOL
Closed loopCL
Open loop owing to drive conditionOL-DRV
Open loop owing to system malfunctionOL-SYS
Closed loop based on one oxygen sensorCL-HO2S
8AThrottle position sensor (main)%
A1Oxygen sensor (front)V
A2Oxygen sensor (rear)V
DIAGNOSIS CODE
The diagnosis and engine warning lamp items are
given in the table below.
Code No.Diagnosis itemMain diagnosis contentsEngine
warning lamp
P0011Variable valve timing systemAbnormal MIVEC system−
P0105Manifold absolute pressure sensor
systemOpen circuit or short-circuit in
sensor-related circuitsON
P0110Intake air temperature sensor
systemOpen circuit or short-circuit in
sensor-related circuitsON
P0115Engine coolant temperature sensor
systemOpen circuit or short-circuit in
sensor-related circuitsON
P0122*Throttle position sensor (main)
circuit low inputOpen circuit or short-circuit in
sensor-related circuitsON
P0123*Throttle position sensor (main)
circuit high inputShort-circuit in sensor-related
circuitsON

DIAGNOSIS SYSTEM
MULTIPOINT FUEL INJECTION (MPI) <4A9>13A-17
DATA LIST FUNCTION
The data list items are given in the table below
Item No.Inspection itemUnit
11Oxygen sensor (front)mV
13Intake air temperature sensor°C
14Throttle position sensor (sub)mV
16Power supply voltageV
18Cranking signal (ignition switch-ST)ON/OFF
21Engine coolant temperature sensor°C
22Crank angle sensorr/min
25Barometric pressure sensorkPa
29Inhibitor switchP or N/D, DS, L, or R
32Manifold absolute pressure sensorkPa
41Injectorsms
44Ignition advanceBTDC
49A/C relayON/OFF
59Oxygen sensor (rear)mV
67Stop lamp switchON/OFF
68Exhaust gas recirculation valveSTEP
77Accelerator pedal position sensor (sub)mV
78Accelerator pedal position sensor (main)mV
79Throttle position sensor (main)mV
7EVariable valve timing phase angleCA
13*Intake air temperature sensor°C
21*Engine coolant temperature sensor°C
22*Crank angle sensorr/min
24*Vehicle speed sensorkm/h
32*Manifold absolute pressure sensorkPa
44*Ignition advancedeg
81*Long-term fuel compensation%
82*Short-term fuel compensation%
87*Calculated load value%
88*Fuel control conditionOpen loopOL
Closed loopCL
Open loop owing to drive
conditionOL-DRV
Open loop owing to system
malfunctionOL-SYS
Closed loop based on one
oxygen sensorCL-HO2S

DIAGNOSIS SYSTEM
MULTIPOINT FUEL INJECTION (MPI) <4A9>13A-20
ACTUATOR TEST FUNCTION
The actuator test items are given in the table below
Item No.Inspection itemDrive contents
01InjectorsCut fuel to No.1 injector
02Cut fuel to No.2 injector
03Cut fuel to No.3 injector
04Cut fuel to No.4 injector
07Fuel pumpFuel pump operates
08Purge control solenoid valveSolenoid valve turns from OFF to ON
17Basic ignition timingSet to ignition adjustment mode
20Cooling fan control relayDrive the fan motor
34Throttle valve control servoStop the throttle valve control servo

GROUP 13B
MULTIPOINT FUEL INJECTION (MPI)
<4G1>
CONTENTS
GENERAL INFORMATIO N . . . . . . . .13B-2
FUEL INJECTION CONTROL . . . . . .13B-7
THROTTLE VALVE OPENING
ANGLE CONTROL AND IDLE
SPEED CONTROL . . . . . . . . . . . . . . .13B-8
IGNITION TIMING AND
DISTRIBUTION CONTROL . . . . . . . .13B-9
FUEL PRESSURE CONT ROL . . . . . .13B-10
WASTE GATE CONTROL . . . . . . . . .13B-11
OTHER CONTROL FUNCTIONS . . . .13B-12
CONTROLLER AREA NETWORK
(CAN) . . . . . . . . . . . . . . . . . . . . . . . . .13B-13
DIAGNOSIS SYSTEM. . . . . . . . . . . . .13B-14

GENERAL INFORMATION
MULTIPOINT FUEL INJECTION (MPI) <4G1>13B-3
SYSTEM BLOCK DIAGRAM
AK600528
Barometric pressure sensorEngine control unitEngine-ECU
[1] Fuel injection control
[2] Throttle valve opening control
and idle speed control
[3] MIVEC (Mitsubishi Innovative
Valve timing Electronic
control system)
[4] Ignition timing control
[5] Engine control relay control
[6] Throttle valve control servo
relay control
[7] Fuel pump relay control
[8] Oxygen sensor (front) heater
control
[9] Oxygen sensor (rear) heater
control
[10] Fuel pressure control
[11] Waste gate control
[12] Fan relay control
[13] A/C compressor relay
control
[14] Alternator control
[15] Purge control
[16] Diagnostic output
[17] RAM data transmission Throttle valve control unit
Throttle opening feedback control
Engine coolant
temperature sensor Intake air temperature sensor Air flow sensor
Accelerator pedal
position sensor (main) Throttle position sensor (sub)
Camshaft position sensor
Crank angle sensor
Oxygen sensor (front)
Oxygen sensor (rear)
Alternator FR terminal
Clutch switch
Detonation sensor
Ignition switch-IG
Ignition switch-ST
Stop lamp switch
Power supply
Throttle position sensor (main)
Accelerator pedel
position sensor (sub)
Throttle valve control servo No.1 injector
No.2 injector
No.3 injector
No.4 injector
No.1 Ignition coil
No.2 Ignition coil
No.3 Ignition coil
No.4 Ignition coil
Engine control relay
Throttle valve control servo relay
Waste gate solenoid valve
A/C compressor relay
Fuel pump relay
Alternator G terminal
Cooling fan control relay (Hi, Lo)
Purge control solenoid valve
Diagnostic output terminal
Oxygen sensor (front) heater
Oxygen sensor (rear) heater Oil feeder control valve
(for MIVEC)
Fuel pressure control
solenoid valve
AB