Mitsubishi 380. Manual — part 639

MULTIPORT FUEL INJECTION (MPI) DIAGNOSIS

MULTIPORT FUEL INJECTION (MPI) <3.8L ENGINE>

13A-648

(B-20) - 38

Camshaft position
sensor

Engine: cranking

0.4 - 4.0 V

Engine: idling

2.9 - 3.9 V

(B-20) - 58

Intake air
temperature
sensor

Ignition switch:
"ON"

When Intake air temperature
is

−20°C (−4°F)

3.8

− 4.4 V

When Intake air temperature
is 0

°C (32°F)

3.2

− 3.8 V

When Intake air temperature
is 20

°C (68°F)

2.3

− 2.9 V

When Intake air temperature
is 40

°C (104°F)

1.5

− 2.1 V

When Intake air temperature
is 60

°C (140°F)

0.8

− 1.4 V

When Intake air temperature
is 80

°C (176°F)

0.4

− 1.0 V

(B-20) - 26

Mass airflow
sensor

Engine: revving

Voltage increase
in response to
revving

(B-20) - 48

Left bank heated
oxygen sensor
heater (front)

Engine: warming up, idling (15 seconds after
starting engine)

0

− 11 V at slow

pulse rate

Engine: revving

0

− 11 V at slow

pulse rate

(B-20) - 47

Right bank heated
oxygen sensor
heater (front)

Engine: warming up, idling (15 seconds after
starting engine)

0

− 11 V at slow

pulse rate

Engine: revving

0

− 11 V at slow

pulse rate

(B-20) - 33

Left bank heated
oxygen sensor
heater (rear)

Engine: warming up, idling

0

− 11 V at slow

pulse rate

Engine: revving

0

− 11 V at slow

pulse rate

(B-20) - 32

Right bank heated
oxygen sensor
heater (rear)

Engine: warming up, idling

0

− 11 V at slow

pulse rate

Engine: revving

0

− 11 V at slow

pulse rate

(B-20) - 49

Throttle actuator
control motor (

−)

• Ignition switch: "ON"

• Accelerator pedal: fully closed → fully opened

Decreases
slightly AC
voltage.

(B-20) - 50

Throttle actuator
control motor (+)

• Ignition switch: "ON"

• Accelerator pedal: fully opened → fully closed

Decreases
slightly AC
voltage.

(B-20) - 21

Evaporative
emission purge
solenoid

Ignition switch: "ON"

B+

Engine: warm up, 3,000 r/min (within 3 minutes
after the engine starting sequence is completed)

B+ to 0.1V
pulses

(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-649

(B-20) - 07

Ignition coil

− No. 1

(ignition power
transistor)

Engine: 3,000 r/min

0.3

− 3.0 V using

oscilloscope

(B-20) - 22

Ignition coil

− No. 2

(ignition power
transistor)

(B-20) - 36

Ignition coil

− No. 3

(ignition power
transistor)

(B-20) - 51

Ignition coil

− No. 4

(ignition power
transistor)

(B-20) - 37

Ignition coil

− No. 5

(ignition power
transistor)

(B-20) - 52

Ignition coil

− No. 6

(ignition power
transistor)

(B-20) - 03

No. 1 injector

• Engine: warming up, idling

• Suddenly depress the accelerator pedal

From 9

− 13 V

using
oscilloscope

(B-20) - 04

No. 2 injector

(B-20) - 34

No. 3 injector

(B-20) - 35

No. 4 injector

(B-20) - 16

No. 5 injector

(B-20) - 17

No. 6 injector

(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-650

TERMINAL RESISTANCE AND CONTINUITY CHECK

03DB160A

ECU Harness Connector Terminal Arrangement

(CONNECTOR
HOUSING NO.)
TERMINAL NO.

INSPECTION ITEM

NORMAL CONDITION (INSPECTION
CONDITION)

(B-21) - 04 to
Body ground

ECU ground

Continuity (2

Ω or less)

(B-21) - 04 to
Body ground

ECU ground

(B-20) - 12

−56

Engine coolant temperature sensor

14.10

− 15.46 kΩ [when engine coolant

temperature is

−20°C (−4°F)]

5.47

− 5.90 kΩ [when engine coolant

temperature is 0

°C (32°F)]

2.35

− 2.50 kΩ [when engine coolant

temperature is 20

°C (68°F)]

1.12

− 1.18 kΩ [when engine coolant

temperature is 40

°C (104°F)]

0.573

− 0.596 kΩ [when engine coolant

temperature is 60

°C (140°F)]

0.313

− 0.323 kΩ [when engine coolant

temperature is 80

°C (176°F)]

(B-20) - 11

−58

Intake air temperature sensor

12.660

− 15.120 kΩ [when intake air

temperature is

−20°C (−4°F)]

5.119

− 5.892 kΩ [when intake air temperature

is 0

°C (32°F)]

2.290

− 2.551 kΩ [when intake air temperature

is 20

°C (68°F)]

1.096

− 1.238 kΩ [when intake air temperature

is 40

°C (104°F)]

0.565

− 0.654 kΩ [when intake air temperature

is 60

°C (140°F)]

0.312

− 0.370 kΩ [when intake air temperature

is 80

°C (176°F)]

(B-20) - 05

−48

Left bank heated oxygen sensor heater
(front)

9.0

− 11.0 Ω [at 20°C (68°F)]

(B-20) - 05

−47

Right bank heated oxygen sensor heater
(front)

9.0

− 11.0 Ω [at 20°C (68°F)]

(B-20) - 05

−33

Left bank heated oxygen sensor heater
(rear)

9.0

− 11.0 Ω [at 20°C (68°F)]

MULTIPORT FUEL INJECTION (MPI) DIAGNOSIS

MULTIPORT FUEL INJECTION (MPI) <3.8L ENGINE>

13A-651

(B-20) - 05

−32

Right bank heated oxygen sensor heater
(rear)

9.0

− 11.0 Ω [at 20°C (68°F)]

(B-20) - 49

−50

Throttle actuator control motor

1.5

± 0.3 Ω [at 20°C (68°F)]

(B-20) - 05

−21

Evaporative emission purge solenoid

16

Ω [at 20°C (68°F)]

(B-20) - 05

−03

No. 1 injector

10.5

− 13.5 Ω [at 20°C (68°F)]

(B-20) - 05

−04

No. 2 injector

(B-20) - 05

−34

No. 3 injector

(B-20) - 05

−35

No. 4 injector

(B-20) - 05

−16

No. 5 injector

(B-20) - 05

−17

No. 6 injector

(CONNECTOR
HOUSING NO.)
TERMINAL NO.

INSPECTION ITEM

NORMAL CONDITION (INSPECTION
CONDITION)