Mitsubishi 380. Manual — part 636

MULTIPORT FUEL INJECTION (MPI) DIAGNOSIS

MULTIPORT FUEL INJECTION (MPI) <3.8L ENGINE>

13A-636

STEP 3. Check the circuit at ECU connector B-20.
(1) Disconnect the connectors B-20 and measure at the

harness side.

(2) Turn the ignition switch to the "ON" position.

(3) Measure the voltage between terminal No. 06 and ground.

• Voltage should be battery positive voltage.

(4) Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is there battery voltage at terminal No. 06?

YES : Replace the ECU. Then confirm that the malfunction

sympton is eliminated.

NO : Refer to GROUP 55, Diagnosis

− Introduction To

Heater, Air Conditioning And Ventilation Diagnosis

P.55-5

. Then confirm that the malfunction symptom is

eliminated.

16DB400A

COVER

ENGINE

CONTROL

UNIT

AIR

CLEANER

03DB176A

B-20 HARNESS

CONNECTOR

MULTIPORT FUEL INJECTION (MPI) DIAGNOSIS

MULTIPORT FUEL INJECTION (MPI) <3.8L ENGINE>

13A-637

DATA LIST REFERENCE TABLE

M1131152001578

CAUTION

• When shifting the selector lever to D range, the brakes should be applied so that the vehicle does

not move forward.

• Driving tests always need two persons: one driver and one observer.

NOTE: Sensor 1 indicates the sensor mounted at a position closest to the engine, and sensor 2 indicates the
sensor mounted at the position second close to the engine.

NOTE: Bank 1 indicates the right bank cylinder, and bank 2 indicates the left bank cylinder

NOTE: *

2

: In a new vehicle [driven approximately 500 km or less], the injector drive time is sometimes 10%

longer than the standard time.

ITEM
NO.

INSPECTION ITEM

INSPECTION REQUIREMENT

NORMAL CONDITION

INSPECTION
PROCEDURE
NO.

REFERENCE
PAGE

1

Power supply
voltage

Ignition switch: "ON"

Battery positive
voltage

Procedure
No. 24

P.13A-604

2

Crank angle
sensor

• Engine: cranking

• Tachometer: connected

Engine speeds
displayed on the
diagnostic tool and
tachometer are
identical.

Code No.
P0335

P.13A-354

Engine: idling

Engine coolant
temperature is
−20°C (−40°F)

1,300

− 1,500 r/min

Engine coolant
temperature is
0

°C (32°F)

1,300

− 1,500 r/min

Engine coolant
temperature is
20

°C (68°F)

1,300

− 1,500 r/min

Engine coolant
temperature is
40

°C (104°F)

1,040

− 1,240 r/min

Engine coolant
temperature is
80

°C (176°F)

680

− 750 r/min

3

Target idle speed Engine idling

Coolant temp <60

°C

710 r/pm

Code No.
P0506
P0507

P.13A-419
P.13A-421

4

Vehicle speed

Actual vehicle speed matches
diplayed.

km/h

Code No.
P0500

P.13A-399

MULTIPORT FUEL INJECTION (MPI) DIAGNOSIS

MULTIPORT FUEL INJECTION (MPI) <3.8L ENGINE>

13A-638

5

Intake air
temperature
sensor

Ignition switch:
"ON" or with
engine running

Intake air
temperature is
−20°C

−20°C

Code No.
P0112,
P0113

P.13A-116

,

P.13A-120

Intake air
temperature is
0

°C

0

°C

Intake air
temperature is
20

°C

20

°C

Intake air
temperature is
40

°C

40

°C

Intake air
temperature is
80

°C

80

°C

6

Engine coolant
temperature
sensor

Ignition switch:
"ON" or with
engine running

Engine coolant
temperature is
−20°C

-20

°C Code

No.

P0116,
P0117,
P0118

P.13A-127

,

P.13A-134

,

P.13A-139

Engine coolant
temperature is
0

°C

0

°C

Engine coolant
temperature is
20

°C

20

°C

Engine coolant
temperature is
40

°C

40

°C

Engine coolant
temperature is
80

°C

80

°C

10

Airflow sensor

• Engine

coolant
temperature
80-95

°C

• Accessories

off

• Transmission

in "P"

Engine idling

1348

− 1367 mV

Code No.
P0101,
P0102,
P0103

P.13A-78
P.13A-81
P.13A-87

2,500 rpm

1943

− 1983 mV

Engine revved

Mass airflow rate
increases in
response to revving

ITEM
NO.

INSPECTION ITEM

INSPECTION REQUIREMENT

NORMAL CONDITION

INSPECTION
PROCEDURE
NO.

REFERENCE
PAGE

MULTIPORT FUEL INJECTION (MPI) DIAGNOSIS

MULTIPORT FUEL INJECTION (MPI) <3.8L ENGINE>

13A-639

11

APS (main)

Ignition switch:
"ON"

Release the
accelerator
pedal

435 to 1035 mV

Code No.
P2122,
P2123

P.13A-476

,

P.13A-485

Depress the
accelerator
pedal gradually

Increases in
response to the
pedal depression
stroke

Depress the
accelerator
pedal fully

4000 to 4824 mV

12

APS (sub)

Ignition switch:
"ON"

Release the
accelerator
pedal

435 to 1035 mV

Code No.
P2127,
P2128

P.13A-493

,

P.13A-502

Depress the
accelerator
pedal gradually

Increases in
response to the
pedal depression
stroke

Depress the
accelerator
pedal fully

4000 to 4824 mV

13

TPS (main)

Ignition switch:
"ON"

Release the
accelerator
pedal

1035 to 1250 mV

Code No.
P0122,
P0123
P2135

P.13A-148

,

P.13A-155
P.13A-510

Depress the
accelerator
pedal gradually

Increases in
response to the
pedal depression
stroke

Depress the
accelerator
pedal fully

4000 to 4824 mV

15

TPS (sub)

Ignition switch:
"ON"

Release the
accelerator
pedal

1035 to 1250 mV

Code No.
P0222,
P0223
P2135

P.13A-318
P.13A-324
P.13A-510

Depress the
accelerator
pedal gradually

Increases in
response to the
pedal depression
stroke

Depress the
accelerator
pedal fully

4000 to 4824 mV

16

Advance ignition

• Engine:

Running

ENGINE ECU
controlled

Varies depending
on ECU
requirement

-

-

Cranking:

No throttle

-3 to -18 CA

Idling:

No throttle

1 to 5 CA

ITEM
NO.

INSPECTION ITEM

INSPECTION REQUIREMENT

NORMAL CONDITION

INSPECTION
PROCEDURE
NO.

REFERENCE
PAGE