Mitsubishi 380. Manual — part 612

MULTIPORT FUEL INJECTION (MPI) DIAG

MULTIPORT FUEL INJECTION (MPI)

13A-540

DIAGNOSIS

STEP 1. Measure the power supply voltage at data link
connector C-125.
(1) Measure voltage between terminal No. 16 and ground.

• Voltage should be battery positive voltage.

Q: Is battery positive voltage (approximately 12 volts)

present?
YES : Go to step 2.
NO : Check harness connectors C-211, C-216 and C-29 at

intermediate connector for damage, and repair or
replace as required. Refer to GROUP 00E, Harness
Connector Inspection

P.00E-2

. If intermediate

connector C-211, C-216 and C-29 are in good
condition, repair an open circuit between fusible link
(1) and data link connector C-125 (terminal No. 16).
Then confirm that the malfunction symptom is
eliminated.

STEP 2. Check the continuity at data link connector C-125.
(1) Check for the continuity between terminal No. 4, No. 5 and

ground.

• Should be less than 2 ohms.

Q: Does continuity exist?

YES : Replace the diagnostic tool. Then confirm that the

malfunction symptom is eliminated.

NO : Repair an open circuit or harness damage between

data link connector C-125 (terminal No. 4, No. 5) and
ground. Then confirm that the malfunction symptom is
eliminated.

03DB187A

CONNECTOR: C-125

DATA LINK

CONNECTOR

AK303229

1 2 3 4 5 6 7 8

16

15

14

13

12

11

10

9

C-125 HARNESS
CONNECTOR:
COMPONENT SIDE

AB

03DB187A

CONNECTOR: C-125

DATA LINK

CONNECTOR

AK303230

1 2 3 4 5 6 7 8

16

15

14

13

12

11

10

9

D-125 HARNESS
CONNECTOR:
COMPONENT SIDE

AB

MULTIPORT FUEL INJECTION (MPI) DIAG

MULTIPORT FUEL INJECTION (MPI)

13A-541

INSPECTION PROCEDURE 2: Diagnostic Tool Communication with ENGINE-ECU Is Not Possible.

.

CIRCUIT OPERATION

• A diagnostic output is made from the

ENGINE-ECU (terminal No. 44) to the diagnostic
output terminal (terminal No. 7) of the data link
connector.

.

COMMENT

• No power supply to ENGINE-ECU.

• Defective ground circuit of ENGINE-ECU.

• Defective ENGINE-ECU.

• Improper communication line between

ENGINE-ECU and diagnostic tool.

.

TROUBLESHOOTING HINTS (The most
likely causes for this case:)

• Malfunction of ENGINE-ECU power supply cir-

cuit.

• Malfunction of the ENGINE-ECU.

• Open circuit between ENGINE-ECU and data link

connector.

• Refer to component locations GROUP-

70

• Refer to configuration diagrams GROUP-

80

• Refer to circuit diagrams GROUP-

90

03DB187A

CONNECTOR: C-125

DATA LINK

CONNECTOR

16DB400A

COVER

ENGINE

CONTROL

UNIT

AIR

CLEANER

03DB171A

CONNECTOR: C-29

C-29

MULTIPORT FUEL INJECTION (MPI) DIAG

MULTIPORT FUEL INJECTION (MPI)

13A-542

DIAGNOSIS

STEP 1. Check harness connector B-21 at ENGINE-ECU for
damage.
Q: Is the harness connector in good condition?

YES : Go to Step 2.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. Then confirm that the

malfunction symptom is eliminated.

STEP2. Check for open circuit, short circuit to ground and
harness damage between data link connector C-125
(terminal No. 7) and ENGINE-ECU connector B-21 (terminal
No. 44).

16DB400A

COVER

ENGINE

CONTROL

UNIT

AIR

CLEANER

03DB187A

CONNECTOR: C-125

DATA LINK

CONNECTOR

16DB400A

COVER

ENGINE

CONTROL

UNIT

AIR

CLEANER

MULTIPORT FUEL INJECTION (MPI) DIAG

MULTIPORT FUEL INJECTION (MPI)

13A-543

NOTE: Check harness after checking intermediate connector
C-29. If intermediate connector C-29 is damaged, repair or
replace them. Refer to GROUP 00E, Harness Connector
Inspection

P.00E-2

. Then check that the malfunction is elimi-

nated.

Q: Is the harness wire in good condition?

YES : Refer to INSPECTION PROCEDURE 24

− Power

Supply System and Ignition Switch-IG System

P.13A-604

.

NO : Repair it. Then confirm that the malfunction symptom

is eliminated.

INSPECTION PROCEDURE 3: The Malfunction Indicator Lamp (Check Engine Lamp) Does Not
Illuminate Right after the Ignition Switch Is Turned to the "ON" Position.

.

COMMENT

• The combination meter causes the malfunction

indicator lamp (Check Engine Lamp) to illuminate
for 20 seconds immediately after the ignition
switch is turned to the "ON" position occurred.

.

TROUBLESHOOTING HINTS (The most
likely causes for this case:)

• Malfunction of the malfunction indicator lamp

(Check Engine Lamp).

• Open or shorted malfunction indicator lamp

(Check Engine Lamp) circuit.

• Refer to component locations GROUP-

70

• Refer to configuration diagrams GROUP-

80

• Refer to circuit diagrams GROUP-

90

DIAGNOSIS

Required Special Tools:

• : Diagnostic tool (MUT-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991910: Main Harness A