MITSUBISHI COLT 2006 Service Repair Manual

FUEL INJECTION CONTROL
MULTIPOINT FUEL INJECTION (MPI) <4G1>13B-7
FUEL INJECTION CONTROL
M2132003000851
The following control is basically the same as those
of the 4G6-MIVEC engine used in the GRANDIS, the
following improvements have been added.•Fuel pressure control solenoid valve
In accordance with the signal received from the
engine-ECU, the fuel is controlled.
System Configuration Diagram
AK401883AD
Air flow sensor
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)
Engine-
ECU
Injector from
fuel pump
To
fuel tank Fuel pressure regulator
Fuel pressure control
solenoid valve
Oil feed
er con t rol valveThe oil fee der control va lve , which is actuate d by the
signals re
ceived f r om th e eng ine-ECU, co ntrols the
valve timing.
Oxygen sensor he ater Tu rns ON a nd OFF the o x ygen senso r heate r circuit
in
accordan ce wit h the sign als rece ive d from the
en
gine-ECU.
Fuel p r essure control solenoid va lveControls the fue l pressure in a cco rdance with the
signals re
ceived f r om th e eng ine-ECU.
Wa ste g a te solen o id valveControls the boo st pre s sure tha t af fe ct s th e waste
ga
te actuator in accord ance with signals re ceived
from the
engin e -ECU.
ECU
Nam
e Func tion

THROTTLE VALVE OPENING ANGLE CONTROL AND IDLE SPEED CONTROL
MULTIPOINT FUEL INJECTION (MPI) <4G1>13B-8
THROTTLE VALVE OPENING ANGLE CONTROL AND IDLE
SPEED CONTROL
M2132003500209
The following control is basically the same as those
of the 4G1-Non-Turbo engine used in the COLT, the
following improvements have been added.
•Clutch monitor switch
The clutch monitor switch inputs the signal into the
engine-ECU to transmit the information about
whether the clutch pedal is depressed or not. By this
signal, the engine-ECU identifies the clutch pedal is
depressed when the transmission is shifted, and per
-
form the following control. When the clutch pedal is
depressed, the throttle valve is automatically closed
and the ignition timing is retarded at the same time.
System Configuration Diagram
AK401884AF
Motor drive power
supply
(From throttle valve
control servo relay)
Engine-ECU
Throttle
position
sensor
Main Sub Sub Main
Throttle valve
control servo Accelerator
pedal position
sensor
Throttle valve control unit
Engine control unit
Motor drive circuit

IGNITION TIMING AND DISTRIBUTION CONTROL
MULTIPOINT FUEL INJECTION (MPI) <4G1>13B-9
IGNITION TIMING AND DISTRIBUTION CONTROL
M2132005000761
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
Air flow sensor
Intake air temperature sensor
Barometric pressure sensor
Engine coolant temperature
sensor
Camshaft position sensor
Crank angle sensor
Detonation sensor
Ignition switch-ST
Clutch switch
Engine-
ECU
AH

FUEL PRESSURE CONTROL
MULTIPOINT FUEL INJECTION (MPI) <4G1>13B-10
FUEL PRESSURE CONTROL
M2132020000069
Normally, the negative pressure in the intake mani-
fold acts upon the fuel pressure regulator to maintain
the fuel pressure at a constant level with regard to
the pressure inside the intake manifold, causing the
amount of fuel injected to be controlled proportion to
the injector drive time. However, if the engine is
started while the engine coolant temperature and the
intake air temperature are high, the engine-ECU makes current flow to the fuel pressure control sole
-
noid valve to activate the fuel pressure regulator by
means of atmospheric pressure. Because of this, the
generation of fuel vapour due to the high fuel pres
-
sure and high temperature is avoided, and the idling
stability immediately after restarting the engine at
high temperature is maintained.
AK402663
To fuel
tank
From
fuel
pump
Fuel pressure
regulator
Fuel pressure
control solenoid
AB
Engine control
relay
Engine coolant temperature
sensorIntake air temperature
sensor
Engine-ECU
Battery

WASTE GATE CONTROL
MULTIPOINT FUEL INJECTION (MPI) <4G1>13B-11
WASTE GATE CONTROL
M2132013000078
Turbo pressure used in the waste gate actuator is
controlled by duty control of the waste gate solenoid
valve. As a result, turbo pressure corresponding to
driving conditions can be obtained.
AK402657
Waste gate
solenoid valveWaste gate
actuator
Battery Engine-ECU Crank angle sensor
Engine
control relay
Air flow sensor
Air by-pass valve
Air
inlet Intercooler
Turbocharger
AB
AK305437
Solenoid
On SolenoidSpring set pressure
Set pressure Actual turbo
pressure (kPa)
Turbo pressure acting on waste
gate actuator (kPa)
OFFAB
The eng
ine-ECU turns the power tran sistor ON and,
whe
n normal curren t (duty 100% ) flows in th e waste
gate solen
o id valve coil, the waste gat e solenoid valve do es n o t ope n if tu rbo pre ssu re does not rise
above the set pre s sure of th e waste gate actua t or
spring since some of the turb o pressure used in th e
wa ste g a te actuato r leaks o u t.
On the ot
her hand, when current do es not flow in the
wa
ste g a te soleno id valve co il (d uty 0 % ), the wa ste
gate valve ope
ns if turbo pressure rise to the set
pressure o
f the waste gat e act uator sprin g since no
pressure leaks out
.
Conseq uently , by u s in g duty co ntrol for the waste
g
a te solen o id valve, turbo pressu re can b e con t ro lled
in a range
f r om 0% to 1 00% duty . Th is du ty co ntrol is
performed in cycles of
approximately 60ms.

OTHER CONTROL FUNCTIONS
MULTIPOINT FUEL INJECTION (MPI) <4G1>13B-12
OTHER CONTROL FUNCTIONS
M2132010000648
The following controls are basically the same as
those of the 4G1-Non-Turbo engine used in the
COLT.
•ENGINE CONTROL RELAY CONTROL
•THROTTLE VALVE CONTROL SERVO RELAY
CONTROL
•MIVEC (Mitsubishi Innovative Valve Timing Elec-
tronic Control System)
•FUEL PUMP RELAY CONTROL
•OXYGEN SENSOR (front) HEATER CONTROL
•OXYGEN SENSOR (rear) HEATER CONTROL
•FAN RELAY CONTROL
•A/C RELAY CONTROL
•ALTERNATOR CONTROL

CONTROLLER AREA NETWORK (CAN)
MULTIPOINT FUEL INJECTION (MPI) <4G1>13B-13
CONTROLLER AREA NETWORK (CAN)
M2132019000300
Establishing communication without fail is designed
by CAN communication protocol. Refer to Group
54C-CAN
P.54C-2 for the details about CAN.
The signals input into engine-ECU are as follows:
CAN Communication Input Signal Table
Input signal nameTransmitter ECU
Motor electric current signalEPS-ECU
Compressor signalMeter and A/C-ECU
Idle-up request signal
Cooling fan request signal
SYSTEM CONFIGURATION DIAGRAM
AK600527AC
Engine-
ECU
M.U.T.-III
EPS-ECU ETACS
-ECU
Steering
wheel
sensor G and
yaw rate
sensor
ASC-ECU
CAN_H
CAN_L Diagnosis
connector Combination
meter
(incorporating
meter-A/C-ECU)
: Shows sub bus line. : Shows main bus line. Terminal resistor
Terminal resistor
Main bus lines

DIAGNOSIS SYSTEM
MULTIPOINT FUEL INJECTION (MPI) <4G1>13B-14
DIAGNOSIS SYSTEM
M2132009000893
Engine-ECU has been provided with the following
functions for easier system inspection.FREEZE-FRAME DATA
When the engine-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
effectiveness of troubleshooting. The freeze-frame
data display items are given below.
Item No.DataUnit
12Air flow sensorg/sec
13Intake air temperature sensor°C
21Engine coolant temperature sensor°C
22Crank angle sensorr/min
24Vehicle speed signalkm/h
44Ignition advancedeg
79Throttle position sensor (main)mV
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
89Fuel control condition−
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 oil passage in variable
valve timing system−
P0090Fuel pressure control solenoid
valve systemOpen circuit or short-circuit in
solenoid valve-related circuitON
P0100Air flow sensor systemOpen circuit or short-circuit in
valve-related circuitsON
P0105Barometric 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
P0122Throttle position sensor (main)
circuit low inputOpen circuit or short-circuit in
sensor-related circuitsON

DIAGNOSIS SYSTEM
MULTIPOINT FUEL INJECTION (MPI) <4G1>13B-15
P0123Throttle position sensor (main)
circuit high inputShort-circuit in sensor-related
circuitsON
P0125Feedback system monitorOxygen sensor not operatingON
P0130Oxygen sensor systemOpen circuit or short-circuit in
sensor-related circuitsON
P0135Oxygen sensor heater systemOpen circuit or short-circuit in
heater-related circuitsON
P0136Oxygen sensor (rear) systemOpen circuit or short-circuit in
sensor-related circuitsON
P0141Oxygen sensor heater (rear)
systemOpen circuit or short-circuit in
heater-related circuitsON
P0170Abnormal fuel systemLeanness or richness problemON
P0201No. 1 injector systemOpen circuit or short-circuit in
injector-related circuitsON
P0202No. 2 injector systemOpen circuit or short-circuit in
injector-related circuitsON
P0203No. 3 injector systemOpen circuit or short-circuit in
injector-related circuitsON
P0204No. 4 injector systemOpen circuit or short-circuit in
injector-related circuitsON
P0222Throttle position sensor (sub)
circuit low inputOpen circuit or short-circuit in
sensor-related circuitsON
P0223Throttle position sensor (sub)
circuit high inputOpen circuit in sensor-related
circuitsON
P0243Abnormal waste gate systemAbnormal in waste gate solenoid
valve−
P0300Random cylinder misfire detection
systemAbnormal ignition signal (Misfiring)ON
P0301No. 1 cylinder misfire detection
systemMisfiringON
P0302No. 2 cylinder misfire detection
systemMisfiringON
P0303No. 3 cylinder misfire detection
systemMisfiringON
P0304No. 4 cylinder misfire detection
systemMisfiringON
P0325Detonation sensor systemAbnormal sensor outputON
P0335Crank angle sensor systemAbnormal sensor outputON
P0340Camshaft position sensor systemAbnormal sensor outputON
P0421Catalyst malfunctionAbnormal exhaust gas purification
performance of catalystON
P0443Purge control solenoid valve
systemOpen circuit or short-circuit in
solenoid valve-related circuitsON
Code No. Diagnosis item Main diagnosis contents Engine
warning lamp

DIAGNOSIS SYSTEM
MULTIPOINT FUEL INJECTION (MPI) <4G1>13B-16
P0500Vehicle speed sensor systemOpen circuit or short-circuit in
sensor-related circuitsON
P0513Immobilizer malfunctionOpen circuit or short-circuit in
sensor-related circuits−
P0603EEPROM malfunctionAbnormality in engine-ECU−
P0606Engine-ECU main processor
malfunctionAbnormality in engine-ECUON
P0622Alternator FR terminal systemOpen circuit or short-circuit in
system-related circuits−
P0638Throttle valve control servo circuit
range/performance problemAbnormal throttle valve control
servoON
P0642Throttle position sensor power
supply malfunctionOpen circuit or short-circuit in
sensor-related circuitsON
P0657Throttle valve control servo relay
circuit malfunctionOpen circuit or short-circuit in
sensor-related circuitsON
P1021Oil feeder control valve systemOpen circuit and short-circuit in
solenoid valve-related circuits−
P1231Trustful check active stability
control (ASC)ABS/ASC-ECU−
P1233Trustful check throttle position
sensor (main)Abnormality in throttle position
sensor (main)ON
P1234Trustful check throttle position
sensor (sub)Abnormality in throttle position
sensor (sub)ON
P1235Trustful check air flow sensorAbnormality in air flow sensorON
P1236A/D converter systemAbnormality in engine-ECUON
P1237Trustful check accelerator pedal
position sensorAbnormality in accelerator pedal
position sensorON
P1238Air flow sensor trustful for torque
monitoringAbnormality in engine-ECUON
P1239Trustful check engine speedAbnormality in engine-ECUON
P1240Trustful check ignition angleAbnormality in ABS/ASC-ECU−
P1241Torque monitoringAbnormality in engine-ECUON
P1602Communication malfunction
(between engine-ECU main
processor and system LSI)Abnormality in engine-ECUON
P1603Battery back-up circuit malfunctionOpen circuit or short-circuit in
system-related circuitsON
P2100Throttle valve control servo circuit
(open)Open circuit in throttle valve control
servo-related circuitON
P2101Throttle valve control servo
magneto malfunctionShort-circuit in system-related
circuitsON
P2108Throttle valve control servo
processor malfunctionAbnormality in engine-CVT-ECUON
Code No. Diagnosis item Main diagnosis contents Engine
warning lamp