Mitsubishi Evolution X. Manual - part 130

HEATED OXYGEN SENSOR HEATER CONTROL

TSB Revision

MULTIPORT FUEL SYSTEM (MFI)

13A-49

HEATED OXYGEN SENSOR HEATER CONTROL

M2132007000392

When exhaust gas temperature is low, the heated 
oxygen sensor response is dull. So, response is 
improved by raising the sensor temperature by pass-
ing current through the heater at a low exhaust gas 
temperature, such as in the immediate aftermath of 
the engine start, or during the warm up operation and 

in cutting the fuel during deceleration. Based on driv-
ing conditions and the heated oxygen sensor activa-
tion state, ECM changes the amount of current (duty 
ratio) to the heater to quicken the activation of the 
heated oxygen sensor.

AK602241AD

Battery

Heated oxygen sensor heater

Engine coolant
temperature sensor

MFI relay

ECM

A/C COMPRESSOR CLUTCH RELAY CONTROL

TSB Revision

MULTIPORT FUEL SYSTEM (MFI)

13A-50

A/C COMPRESSOR CLUTCH RELAY CONTROL

M2132034500313

The ECM turns on the power transistor when the A/C 
switch ON signal is input by the A/C-ECU through 
the CAN. This allows the A/C compressor clutch 
relay to be ON and to be operated. During the high 
load operation, such as the acceleration with the fully 
opened accelerator, the ECM secures the accelera-
tion capability by turning OFF the A/C compressor 
clutch relay for the specified period to produce no 
load on the A/C compressor.

AK604138

OFF

ON

AE

Battery

A/C compressor
clutch relay

A/C compressor
assembly

A/C compressor
clutch relay control

A/C compressor
clutch

A/C
refrigerant
temperature
switch

OFF

ON

A/C switch (CAN)

ECM

GENERATOR CONTROL

TSB Revision

MULTIPORT FUEL SYSTEM (MFI)

13A-51

GENERATOR CONTROL

M2132025000343

During engine idle operation, ECM controls duty of 
conduction between generator G terminal and 
ground. (G terminal duty is controlled to be the same 
as ON duty of the power transistor inside the voltage 
regulator). If headlights etc. are turned on while 
engine is idling, the consumed current increases 
suddenly, but by gradually increasing the generator 

G terminal OFF duty, ECM restricts sudden increase 
in generator's output current and output current is 
increased only gradually. (Battery current is supplied 
to the headlamp etc. till generator produces sufficient 
current.) Thus, ECM prevents change in idle speed 
due to sudden increase of engine load.

EVAPORATIVE EMISSION PURGE CONTROL

M2132012000224

Refer to GROUP 17 

− Emission Control − Evaporative Emis-

sion Control System 

P.17-11

.

AK602242AD

Engine coolant temperature sensor

Generator G terminal

Generator FR terminal

Generator

Crankshaft position sensor

A/C switch (CAN)

Ignition switch-ST

ECM

EVAPORATIVE EMISSION CONTROL SYSTEM INCORRECT PURGE FLOW MONITOR

TSB Revision

MULTIPORT FUEL SYSTEM (MFI)

13A-52

EVAPORATIVE EMISSION CONTROL SYSTEM 

INCORRECT PURGE FLOW MONITOR

M2132027200020

The ECM detects whether the fuel vapor leakage 
exists or not from the evaporative emission control 
system. By the specified pattern within the certain 
operation range, the ECM drives the evaporative 
emission purge solenoid and the evaporative emis-
sion ventilation solenoid. This allows slight vacuum 
to be produced in the fuel tank.

The ECM measures the vacuum condition through 
the fuel tank differential pressure sensor signal. By 
comparing the normal (expected) value and the 
actual value, the ECM detects whether the fuel vapor 
leakage exists or not from the evaporative emission 
control system.

CONTROLLER AREA NETWORK (CAN)

M2132019000571

CAN communication is established to ensure the reli-
able transmission of information. Refer to GROUP 
54C 

− General Information

P.54C-2

.

AK703840

Fuel level sensor (CAN)

Engine coolant
temperature sensor

Intake air temperature
sensor 1

Mass airflow sensor

Barometric pressure
sensor

AB

Battery

MFI relay

ECM

Evaporative
emission
purge solenoid

Evaporative emission
ventilation solenoid

Fuel tank differential pressure sensor

Fuel tank temperature sensor

Check valve

Fuel tank

Fuel level
sensor