Mitsubishi Outlander (2013+). Manual - part 138

ENGINE CONTROL RELAY CONTROL

MULTIPOINT FUEL INJECTION (MPI)

13A-36

ENGINE CONTROL RELAY CONTROL

M2132006000720

When the ignition switch-IG "ON" signal is input, 
engine-ECU turns ON the power transistor for control 
of the engine control relay. As a result, current flows 
through the engine control relay's coil, the relay 
switch turns ON and power is supplied to each sen-
sor and actuator. Also, when ignition switch-IG "OFF" 
signal is input, engine-ECU performs the following 
controls and then turns OFF the power transistor for 
control of engine control relay.

• Throttle valve initializing control

AK604134AD

OFF

ON

IG2

ST

LOCK

ACC

IG1

Engine control
relay

Power
source

Engine control relay control

Ignition switch-IG

Battery
backup

To each sensor and
actuator

Ignition switch

ETACS-ECU

Battery

E

ngine-ECU

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FUEL PUMP RELAY CONTROL

MULTIPOINT FUEL INJECTION (MPI)

13A-37

FUEL PUMP RELAY CONTROL

M2132006500769

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, engine-ECU 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.

AK700635

M

OFF

ON

OFF

ON

AB

IG2

ST

LOCK

ACC

IG1

ETACS-ECU

Engine-ECU

Fuel pump 
and gauge 
unit

Fuel pump
relay

Crank angle sensor

Ignition switch

Ignition switch-ST

Battery

Fuel pump
relay control

Engine control 
relay

To engine-ECU

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STARTER RELAY CONTROL

MULTIPOINT FUEL INJECTION (MPI)

13A-38

STARTER RELAY CONTROL

M2132025500672

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

AK800140

M

AB

P

N

R

OFF

ON

OFF

ON

Engine-ECU

Starter relay
control

Inhibitor
switch

Ignition switch-ST

Battery

Starter relay

Starter

ETACS
-ECU

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OXYGEN SENSOR HEATER CONTROL

MULTIPOINT FUEL INJECTION (MPI)

13A-39

OXYGEN SENSOR HEATER CONTROL

M2132007000734

When exhaust gas temperature is low, the 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 condi-
tions and the oxygen sensor activation state, 
engine-ECU changes the amount of current (duty 
ratio) to the heater to quicken the activation of the 
oxygen sensor.

AK602241AE

Battery

Oxygen sensor heater

Engine coolant
temperature sensor

Engine control
relay

E

ngine-ECU

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