Mitsubishi 380. Manual - part 638

 

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Mitsubishi 380. Manual - part 638

 

 

MULTIPORT FUEL INJECTION (MPI) DIAGNOSIS

MULTIPORT FUEL INJECTION (MPI) <3.8L ENGINE>

13A-644

ACTUATOR TEST REFERENCE TABLE

M1131152500570

MUT-III 
DIAGNOS
TIC TOOL 
DISPLAY

ITEM 
NO.

INSPECTION 
ITEM

DRIVE 
CONTENTS

INSPECTION REQUIREMENT

NORMAL 
CONDITION

INSPECTION 
PROCEDURE 
NO.

REFERENCE 
PAGE

1

Injectors

Cut fuel to 
No.1 injector

Engine: warm up, idle (cut 
the fuel supply to each 
injector in turn and check 
cylinders which don’t 
affect idling.)

Idling 
becomes 
unstable.

Code No.
P0201

P.13A-272

2

Cut fuel to 
No.2 injector

Code No.
P0202

P.13A-280

3

Cut fuel to 
No.3 injector

Code No.
P0203

P.13A-287

4

Cut fuel to 
No.4 injector

Code No.
P0204

P.13A-295

5

Cut fuel to 
No.5 injector

Code No.
P0205

P.13A-302

6

Cut fuel to 
No.6 injector

Code No.
P0206

P.13A-310

10

Purge 
control 
solenoid 
valve

Solenoid 
valve turns 
from OFF to 
ON.

Ignition switch: "ON" 

Clicks 
when 
solenoid 
valve is 
driven.

Code No.
P0443

P.13A-389

14

PWM 
Radiator 
fan

Actuate fan 
motor

• Ignition switch "ON"

• A/C switch "ON"

Fan motor 
is rotated

Symptom 
chart

P.14-3

16

A/C relay

Activate A/C 
relay

• Ignition switch "ON"

• A/C switch "ON/OFF"

Relay 
operates

-

-

MULTIPORT FUEL INJECTION (MPI) DIAGNOSIS

MULTIPORT FUEL INJECTION (MPI) <3.8L ENGINE>

13A-645

CHECK AT THE ELECTRONIC CONTROL UNIT (ECU)

1. Disconnect the ECU connectors B-20 and B-21 

and connect check harness special tool 
MB992044

 

between the ECU connectors.

2. Measure the voltage between each check 

harness connector terminal and check harness 
connector ground terminal (No. 25 or No. 29).

TERMINAL VOLTAGE CHECK CHART

03DB159A

Check Harness Special Tool MB992044 Connector Terminal Arrangement

(CONNECTOR 
HOUSING NO.) 
TERMINAL NO.

INSPECTION 
ITEM

INSPECTION CONDITION (ENGINE 
CONDITION)

NORMAL 
CONDITION

(B-21) - 71  

Fan control 

Ignition switch: "ON"

5 V fan off

Carry out the actuator test to revolve the fan at 
high speed.

1 V or less

(B-21) - 92

Fuel pump relay

Ignition switch: "ON"

B+

Engine: idling

1 V or less

(B-20) - 25

Sensor supplied 
voltage

Ignition switch: "ON"

4.9 

− 5.1 V

(B-21) - 76

(B-21) - 59

Accelerator pedal 
position sensor 
(main)

Ignition switch: 
"ON"

Release the accelerator 
pedal

0.996 V

Depress the accelerator 
pedal fully

4.043 V 

(B-21) - 81

Accelerator pedal 
position sensor 
(sub)

Ignition switch: 
"ON"

Release the accelerator 
pedal

0.996 V

Depress the accelerator 
pedal fully

4.043 V

 

(B-21) - 75

Power supply 
voltage applied to 
accelerator pedal 
position sensor  

Ignition switch: "ON"

4.9 

− 5.1 V

(B-21) - 21

Brake lamp switch

Depress the brake pedal

B+

Release the brake pedal

1 V or less

(B-21) - 16

Backup power 
supply

Ignition switch: "LOCK" (OFF)

B+

(B-21) - 70

Ignition switch-IG

Ignition switch: "ON" 

B+

(B-20) - 05

Power supply

Ignition switch: "ON"

B+

(B-20) - 24

MPI relay (power 
supply)

Ignition switch: "LOCK" (OFF)

B+

Ignition switch: "ON"

1 V or less

MULTIPORT FUEL INJECTION (MPI) DIAGNOSIS

MULTIPORT FUEL INJECTION (MPI) <3.8L ENGINE>

13A-646

(B-20) - 53

Power steering 
pressure switch

Engine: warming 
up, idling

When steering wheel is not 
turned

B+

When steering wheel is 
turned

1V or less

(B-20) - 06

A/C compressor 
clutch relay

• Engine: idling

• A/C switch: OFF→ ON (A/C compressor is 

operating)

B+

→ 1 V or less 

as A/C clutch 
cycles

(B-20) - 09

Ignition switch-ST

Engine: cranking

8 V or more

(B-20) - 15

Left bank heated 
oxygen sensor 
(front)

Engine: warming up, 2,500 r/min (check using a 
digital voltmeter)

⇔ 0.8 V 

(changes 
repeatedly) 

(B-20) - 45

Right bank heated 
oxygen sensor 
(front)

Engine: warming up, 2,500 r/min (check using a 
digital voltmeter)

⇔ 0.8 V 

(changes 
repeatedly) 

(B-20) - 56

Engine coolant 
temperature 
sensor

Ignition switch: 
"ON"

When engine coolant 
temperature is 

−20°C (−4°F)

3.9 

− 4.5 V

When engine coolant 
temperature is 0

°C (32°F)

3.2 

− 3.8 V

When engine coolant 
temperature is 20

°C (68°F)

2.3 

− 2.9 V

When engine coolant 
temperature is 40

°C (104°F)

1.3 

− 1.9 V

When engine coolant 
temperature is 60

°C (140°F)

0.7 

− 1.3 V

When engine coolant 
temperature is 80

°C (176°F)

0.3 

− 0.9 V

(B-20) - 10

Power supply 
voltage applied to 
throttle position 
sensor

Ignition switch: "ON"

4.9 

− 5.1 V

(B-20) - 30

Left bank heated 
oxygen sensor 
(rear)

• Engine: warming up

• Revving

0 and 0.6 

− 1.0 V 

alternates

(B-20) - 60

Right bank heated 
oxygen sensor 
(rear)

• Engine: warming up

• Revving

0 and 0.6 

− 1.0 V 

alternates

(CONNECTOR 
HOUSING NO.) 
TERMINAL NO.

INSPECTION 
ITEM

INSPECTION CONDITION (ENGINE 
CONDITION)

NORMAL 
CONDITION

MULTIPORT FUEL INJECTION (MPI) DIAGNOSIS

MULTIPORT FUEL INJECTION (MPI) <3.8L ENGINE>

13A-647

(B-20) - 57

Throttle position 
sensor (sub)

• Remove the 

intake air hose 
at the throttle 
body. 

• Ignition switch: 

"ON"

• Visually inspect 

throttle plate for 
full travel. 

Fully depress and release 
accelerator pedal.

WARNING

If the air intake duct is 
removed from the 
throttle body take great 
care to keep fingers 
away from the throttle 
plate. The drive motor 
has very high torque 
and is capable of 
random movement at 
any time. Do not under 
any circumstances 
activate the throttle 
plate by hand.

1172 

− 4043 mV

(B-20) - 42

Throttle position 
sensor (main)

• Remove the 

intake air hose 
at the throttle 
body. 

• Ignition switch: 

"ON"

• Visually inspect 

throttle plate for 
full travel. 

Fully depress and release 
accelerator pedal.

WARNING

If the air intake duct is 
removed from the 
throttle body take great 
care to keep fingers 
away from the throttle 
plate. The drive motor 
has very high torque 
and is capable of 
random movement at 
any time. Do not under 
any circumstances 
activate the throttle 
plate by hand.

1172 

− 4043 mV

(B-20) - 41

Manifold absolute 
pressure sensor

Ignition switch: 
"ON"

AT altitude of 0 m (0 ft.)

3.8 

− 4.2 V

AT altitude of 600 m (1,969 
ft.)

3.5 

− 3.9 V

AT altitude of 1,200 m (3,937 
ft.)

3.3 

− 3.7 V

AT altitude of 1,800 m (5,906 
ft.)

3.0 

− 3.4 V

Engine: warming up, idling

0.6 

− 1.4 V

When engine is suddenly revved

Voltage Varies

(B-20) - 23

Crankshaft 
position sensor

Engine: cranking

0.4 - 4.0 V

Engine: idling

2.0 - 3.0 V

(CONNECTOR 
HOUSING NO.) 
TERMINAL NO.

INSPECTION 
ITEM

INSPECTION CONDITION (ENGINE 
CONDITION)

NORMAL 
CONDITION

 

 

 

 

 

 

 

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