Mitsubishi Outlander XL. Manual — part 1249

MULTIPORT FUEL INJECTION (MFI) RELAY CONTROL

M21302000060USA0000010000

ZK602615

OFF

ON

AA00

IG2

ST

LOCK

ACC

IG1

Battery

MFI relay

Power
supply

MFI relay control

Ignition switch-IG

Battery
back up

To each sensor and
actuator

Ignition switch

ECM

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 performs the
following controls and then turns OFF the power
transistor for control of MFI relay.

｠

Throttle valve initializing control

13A-44

MULTIPORT FUEL SYSTEM (MFI)

FUEL PUMP RELAY CONTROL

FUEL PUMP RELAY CONTROL

M21302000065USA0000010000

ZK602521

M

OFF

ON

AA00

IG2

ST

LOCK

ACC

IG1

ETACS
-ECU

ECM

Fuel pump

Fuel pump
relay

Crankshaft position sensor

Ignition switch-ST

Ignition switch

Battery

Fuel pump
relay control

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
stoppages such as engine stalling etc. by stopping the
pump.

MULTIPORT FUEL SYSTEM (MFI)

13A-45

STARTER RELAY CONTROL

STARTER RELAY CONTROL

M21302000255USA0000010000

ZK602523

M

AA00

P

Ds

D

N

R

OFF

ON

OFF

ON

ECM

Starter relay
control

Inhibitor
switch

Ignition switch-ST

Battery

Starter relay

Starter

When the ignition switch-ST signal is input, ECM turns
ON the power transistor for control of the starter relay.

13A-46

MULTIPORT FUEL SYSTEM (MFI)

HEATED OXYGEN SENSOR HEATER CONTROL

HEATED OXYGEN SENSOR HEATER CONTROL

M21302000070USA0000010000

ZK600301

Battery

ECM

Heated oxygen sensor

Engine coolant
temperature sensor

MFI relay

AA01

When exhaust gas temperature is low, the heated
oxygen sensor response is dull. So, response is
improved by raising the sensor temperature by
passing 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
driving conditions and the heated oxygen sensor
activation state, ECM changes the amount of current
(duty ratio) to the heater to quicken the activation of
the heated oxygen sensor.

MULTIPORT FUEL SYSTEM (MFI)

13A-47

A/C COMPRESSOR RELAY CONTROL