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