2008 MITSUBISHI LANCER EVOLUTION X turn signal

MITSUBISHI MULTI COMMUNICATION SYSTEM (MMCS)
TSB Revision
CIRCUIT DIAGRAMS90-188
MITSUBISHI MULTI-COMMUNICATION SYSTEM (MMCS) (CONTINUED)
COMBINATION
METER
INTERFACE
CIRCUITCAN TRANSCEIVER
CIRCUIT CPU (FUSE )
9
RHEOSTATTONE
ALARM INTERFACE
CIRCUIT
AUDIO VISUAL NAVIGATION UNIT
·AIR CONDITIONING
SYSTEM
·AUTO-CRUISE
CONTROL SYSTEM
·CLOCK
·HANDS FREE
SYSTEM
·INVECS-III CVT
·TURN-SIGNAL
LIGHT AND
HAZARD WARNING
LIGHT:
·AIR CONDITIONING
SYSTEM
·INVECS-III CVT
·TURN-SIGNAL
LIGHT AND
HAZARD WARNING
LIGHT: NOTEJOINT CONNECTOR (3)

EMISSION CONTROL
ENGINE AND EMISSION CONTROL17-13
EXHAUST GAS RECIRCULATION (EGR) VALVE
An EGR valve is installed in the EGR valve support.The EGR
valve controls EGR flow volume using the stepper motor
method and reduces exhaust gas (NOx) and fuel consumption.
The EGR valve drives the stepper motor based on the signal
from ECM. When stepper motor rotor turns in clockwise or
anti-clockwise direction, the shaft fitted with a rotor and a screw
expands and contracts and the movement of the shaft causes
the valve to go up and down. Thus, EGR path gap is controlled
minutely. The stepper motor turns 15
° per step. The stepper
motor turns forward or back only up to the angle dictated by the
number of pulse signals (number of steps) from the ECM. In
other words, increase and decrease of the EGR flow volume
depends on the number of signals (number of steps) from
ECM. ECM changes current flow to the 4 coils (A, B, C, D) in
the stepper motor in sequence according to the phase pattern
in the following chart in order to turn the stepper motor rotor.
Open valve changes phase in order of 0
→ 1 → 2 → 3 → 0. Close
valve changes phase in order of 3
→ 2 → 1 → 0 → 3.
Phase
numberStepper motor coil
Coil ACoil BCoil CCoil D
0ONOFFOFFON
1ONOFFONOFF
2OFFONONOFF
3OFFONOFFON
AK604144
Coil
Shaft
Valve Outlet
Inlet
Rotor
Magnet
AB
AK604145
From MFI relay
EGR valve
(stepper motor)
ECM Coil
ACoil
BCoil
CCoil
DFlow rate
Step
AB

SENSOR
MULTIPORT FUEL SYSTEM (MFI)13A-21
.
GENERATOR FR TERMINAL
Generator turns ON/OFF the power transistor in the voltage
regulator to adjust current flow in the field coil according to
alternator output current. In this way generator's output voltage
is kept adjusted (to about 14.7 V). The ratio of power transistor
ON time (ON duty) is output from generator FR terminal to
ECM. ECM uses this signal to detect generator's output current
and drives throttle actuator control motor according to output
current (electric load). This prevents change in idle speed due
to electric load and helps maintain stable idle speed.
.
AK602229AD
FR BS
Field coil
IC regulator
GeneratorIgnition switch-IG
Battery
ECM

SENSOR
MULTIPORT FUEL SYSTEM (MFI)13A-22
GENERATOR L TERMINAL
After turning on the ignition switch, the current is input by the
ECM to the generator L terminal. This allows the IC regulator to
be on and the field coil to be excited. When the generator
rotates in this situation, the voltage is excited in the stator coil
and the current is output from B-terminal through the commuta
-
tion diode. Also the generated voltage is input to the voltage
regulator through the commutation diode. After the electric gen
-
eration begins, the current is supplied to the field coil from this
circuit. In addition, the generated voltage is output from the
generator L terminal to the ECM. This allows the ECM to detect
that the electric generation begins. The ECM outputs the ON
signal to the combination meter through the CAN and then
turns off the generator malfunction light.
AK602577
L BS
AC
Battery
GeneratorIC regulator Ignition switch-IG
CAN
communication
Generator
malfunction
light
Combination meterECM
Field coil

ACTUATOR
MULTIPORT FUEL SYSTEM (MFI)13A-23
ACTUATORM2132002000353
INJECTOR
An injector is an injection nozzle with the electromagnetic valve
that injects fuel based on the injection signal sent by ECM. 1
injector is installed in the intake manifold of each cylinder and
fixed to the fuel rail. When electricity flows through the solenoid
coil, the plunger gets sucked in. The ball valve is integrated
with the plunger, and gets pulled together with the plunger till
the fully open position so that the injection hole is fully open
and the fuel gets injected.
Voltage from the battery gets applied from the injector relay to
the injector and up to the ECM. ECM turns ON its power tran
-
sistor and prepares the injector's ground circuit. Thus, current
flows through the injector while power transistor is ON and the
injector injects fuel.
AK602272AC
Fuel
Plate Ball valvePlunger Solenoid coilConnector
Filter
AK602578
From ETACS-ECUFrom MFI relay
Injector relay
Injectors
OFF ON
ECM
AC
No. 1 No. 2 No. 3 No. 4

THROTTLE VALVE OPENING ANGLE CONTROL AND IDLE SPEED CONTROL
MULTIPORT FUEL SYSTEM (MFI)13A-39
List of main compensations for throttle valve opening angle and idle speed control
Initialize control
After ignition switch turns OFF, ECM drives the throt-
tle valve from fully closed position to fully open posi-
tion and records the fully closed/open studied value
of the throttle position sensor (main and sub) output
signals. The recorded studied values are used as
studied value compensation for compensating basic
target opening angle when the engine is started next.
CompensationsContent
Stable idle compensation (immediately after start)In order to stabilize idle speed immediately after
start, target opening angle is kept big and then
gradually reduced. Compensation values are set
based on the engine coolant temperature.
Rotation speed feedback compensation (while
idling)In case there is a difference between the target idle
speed and actual engine speed, ECM
compensates the throttle valve opening angle
based on that difference.
Atmospheric pressure compensationAt high altitudes atmospheric pressure is less and
the intake air density is low. So, the target opening
angle is compensated based on atmospheric
pressure.
Engine coolant temperature compensationCompensation is made according to the engine
coolant temperature. The lower the engine coolant
temperature the greater the throttle valve opening
angle.
Electric load compensationThrottle valve opening angle is compensated
according to electric load. The greater the electric
load, the greater the throttle valve opening angle.
Compensation when shift is in D range When transmission is changed from P or N range
to some other range, throttle valve opening angle is
increased to prevent reduction in engine speed.
Compensation when A/C is functioningThrottle valve opening angle is compensated
according to functioning of A/C compressor. While
A/C compressor is being driven, the throttle valve
opening angle is increased.
Power steering fluid pressure compensationThrottle valve opening angle is compensated
according to power steering functioning. When
power steering oil pressure rises and power
steering pressure switch is ON, the throttle valve
opening angle is increased.

MULTIPORT FUEL INJECTION (MFI) RELAY CONTROL
MULTIPORT FUEL SYSTEM (MFI)13A-45
MULTIPORT FUEL INJECTION (MFI) RELAY CONTROLM2132006000173
When the ignition switch-IG "ON" signal is input,
ECM turns ON the power transistor for control of the
MFI relay. As a result, current flows through the MFI
relay's coil, the relay switch turns ON and power is
supplied to each sensor and actuator. Also, when
ignition switch-IG "OFF" signal is input, ECM per
-
forms the following controls and then turns OFF the
power transistor for control of MFI relay.
•Throttle valve initializing control
AK604134AB OFF
ON
IG2 STLOCK
ACC
IG1
MFI relay
Power
supply
MFI relay control Ignition switch-IGBattery
back up To each sensor and
actuatorIgnition switch
ETACS-ECU Battery
ECM

FUEL PUMP RELAY CONTROL
MULTIPORT FUEL SYSTEM (MFI)13A-46
FUEL PUMP RELAY CONTROLM2132006500208
When current flows through the fuel pump relay, the
relay turns ON and the fuel pump is driven. The fuel
pump relay is built into the ETACS-ECU. When the
ignition switch-ST signal is input, ECM turns ON the
power transistor for control of the fuel pump relay. As a result, power is supplied to the fuel pump. Also, if
engine speed falls below a set value, the fuel pump
relay is turned OFF. Thus, it deals with sudden stop
-
pages such as engine stalling etc. by stopping the
pump.
AK604135
M
OFF
ON
OFF
ON
AB IG2 STLOCK
ACC
IG1
ETACS
-ECUMFI
relay
ECM Fuel pumpFuel pump
relay
Crankshaft position sensor Ignition switch
To ECM
Ignition switch-ST Battery
Fuel pump
relay control