Mitsubishi Evolution X. Manual - part 123

SENSOR

TSB Revision

MULTIPORT FUEL SYSTEM (MFI)

13A-21

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FUEL TANK DIFFERENTIAL PRESSURE SENSOR

The fuel tank differential pressure sensor is installed to the fuel 
pump module. The fuel tank differential pressure sensor out-
puts the voltage to the ECM using the piezo resistive semicon-
ductor in accordance with the difference between pressure in 
the fuel tank and the pressure of the atmosphere. When moni-
toring the evaporative leak, the ECM detects malfunctions of 
the evaporative emission control system by monitoring the 
amount of output voltage changes from this sensor. The sensor 
characteristics are as shown in the diagram.

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AK702849

AD

12

0

OFF

ON

ECM terminal voltage V

Operating point

Clutch pedal:
release

Clutch pedal:
depress

Stroke mm

Cluch pedal
position switch

ECM

ON

OFF

AK604121

Pressure

Fuel tank differential
pressure sensor

AB

AK604122

5 V

0

Ground

Output voltage V

 

Pressure kPa (in. Hg)

Fuel tank differential pressure sensor

ECM

Power supply

Output signal

AB

SENSOR

TSB Revision

MULTIPORT FUEL SYSTEM (MFI)

13A-22

FUEL TANK TEMPERATURE SENSOR

The fuel tank temperature sensor is installed to the fuel pump 
module. The fuel tank temperature sensor detects the tempera-
ture inside the fuel tank using the resistance change in the ther-
mistor and outputs the voltage to the ECM in accordance with 
the temperature inside the fuel tank. The ECM monitors the 
evaporative leak in accordance with the fuel tank temperature. 
The sensor characteristics are as shown in the diagram.

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GENERATOR FR TERMINAL

Generator turns ON/OFF the power transistor in the voltage 
regulator to adjust current flow in the field coil according to gen-
erator output current. In this way generator's output voltage is 
kept adjusted (to about 14.4 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.

AK604123 AB

Sensory part
(thermistor)

Fuel tank
temperature
sensor

AK604124

ECM

Resistance k

Ω

Output voltage V

 

5 V

AB

Fuel tank temperature
sensor (thermistor)

Fuel tank
temperature ˚C (˚F)

Fuel tank
temperature ˚C (˚F)

SENSOR

TSB Revision

MULTIPORT FUEL SYSTEM (MFI)

13A-23

.

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.

AK702852AE

FR

B

S

Field coil

IC regulator

Generator

Ignition switch-IG

Battery

ECM

SENSOR

TSB Revision

MULTIPORT FUEL SYSTEM (MFI)

13A-24

AK702853AD

L

B

S

Field coil

IC regulator

Generator

Ignition switch-IG

Battery

ECM

CAN
communication

Generator
malfunction
light

Combination meter