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Mitsubishi 380. Manual - part 615

MULTIPORT FUEL INJECTION (MPI) DIAG

MULTIPORT FUEL INJECTION (MPI)

13A-552

STEP 15. Check for harness damage between injector
connector and ENGINE-ECU connector.

a. Check the harness wire between injector connector B-01

(terminal No. 2) and ENGINE-ECU connector B-20 (termi-
nal No. 03) at No. 1 cylinder injector.

b. Check the harness wire between injector connector B-30

(terminal No. 2) and ENGINE-ECU connector B-20 (termi-
nal No. 04) at No. 2 cylinder injector.

c. Check the harness wire between injector connector B-03

(terminal No. 2) and ENGINE-ECU connector B-20 (termi-
nal No. 34) at No. 3 cylinder injector.

d. Check the harness wire between injector connector B-27

(terminal No. 2) and ENGINE-ECU connector B-20 (termi-
nal No. 35) at No. 4 cylinder injector.

e. Check the harness wire between injector connector B-04

(terminal No. 2) and ENGINE-ECU connector B-20 (termi-
nal No. 16) at No. 5 cylinder injector.

f. Check the harness wire between injector connector B-26

(terminal No. 2) and ENGINE-ECU connector B-20 (termi-
nal No. 17) at No. 6 cylinder injector.

Q: Is the harness wire in good condition?

YES : Check the following items, and repair or replace the

defective items.

a. Check the ignition coil and spark plugs.
b. Check if the injectors are clogged.

c. Check if fuel is contaminated.

d. Check compression.

Then confirm that the malfunction symptom is

eliminated.

NO : Repair it. Then confirm that the malfunction symptom

is eliminated.

STEP 16. Check injector is insulated from earth.
(1) Measure the resistance between each injector housing and

earth.

Q: Is there no continuity?

YES : ok.
NO : Repair or replace injector. Then confirm that the

malfunction symptom is eliminated.

AK303235

B-30 (GR)

B-04 (GR)

B-01 (GR)

B-27 (GR)

B-03 (GR)

B-26 (GR)

CONNECTOR: B-01, B-03, B-04, B-26,B-27,

B-30

HARNESS CONNECTOR:

COMPONENT SIDE

16DB400A

COVER

ENGINE

CONTROL

UNIT

AIR

CLEANER

03DB230A

INJECTOR
HOUSING

MULTIPORT FUEL INJECTION (MPI) DIAG

MULTIPORT FUEL INJECTION (MPI)

13A-553

INSPECTION PROCEDURE 6: Starts Up and Dies.

COMMENT

• In such cases as the above, the cause is usually

improper air/fuel mixture. It is possible, though
less likely, that the spark plugs are generating
sparks but the sparks are weak.

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

• Malfunction of the ignition system.

• Malfunction of the injector system.

• Contaminated fuel.

• Poor compression.

• Dirtiness around throttle valve.

• Malfunction of the ENGINE-ECU.

• Refer to component locations GROUP-

• Refer to configuration diagrams GROUP-

• Refer to circuit diagrams GROUP-

DIAGNOSIS

Required Special Tools:

• : Diagnostic Tool (MUT-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991910: Main Harness A

STEP 1. Measure the battery positive voltage.
(1) Measure the battery positive voltage during cranking.

• The voltage should be 8 volts or more.

Q: Does the voltage remain greater than 8 volts while the

engine is cranked?
YES : Go to Step 2.
NO : Refer to GROUP 54A, Battery

− Battery Check

P.54A-5

STEP 2. Using diagnostic tool , read the diagnostic trouble
code (DTC).

CAUTION

To prevent damage to diagnostic tool , always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting diagnostic tool .
(1) Connect diagnostic tool to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Read the DTC.
(4) Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the DTC set?

YES : Refer to Diagnostic Trouble Code Chart

P.13A-17

NO : Go to Step 3.

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

MULTIPORT FUEL INJECTION (MPI) DIAG

MULTIPORT FUEL INJECTION (MPI)

13A-554

STEP 3. Check for Fuel Pump operation.
(1) Refer to Fuel Pump Operation Check

P.13A-664

Q: Is the actuator operating properly?

YES : Go to Step 4.
NO : Repair or replace it. Then confirm that the malfunction

symptom is eliminated.

STEP 4. Using diagnostic tool , check data list.
(1) Turn the ignition switch to the "ON" position.
(2) Check the following items in the data list. Refer to Data List

Reference Table

P.13A-637

a. Item 06: Engine Coolant Temperature Sensor.

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

Q: Is the sensor operating properly?

YES : Go to Step 5.
NO : Repair or replace it. Then confirm that the malfunction

symptom is eliminated.

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

MULTIPORT FUEL INJECTION (MPI) DIAG

MULTIPORT FUEL INJECTION (MPI)

13A-555

STEP 5. Inspection of throttle body (throttle valve area) for
dirtiness.

Q: Is the throttle valve area dirty?

YES : Refer to On-vehicle Service

− Throttle Body (Throttle

Valve Area) Cleaning.

P.13A-660

NO : Go to Step 6.

STEP 6. Check the advance ignition timing.
(1)

Check the iadvance gnition timing at cranking.

Standard value: 5

° BTDC ± 3°

Q: Is the ignition timing normal?

YES : Go to Step 7.
NO : Check that the crankshaft position sensor and timing

belt cover are in the correct position. Then confirm
that the malfunction symptom is eliminated.

STEP 7. Check the left bank injector.
(1) Disconnect the left bank injector connector B-27, B-26,

B-30.

(2) Measure the resistance between each injector side

connector terminal No. 1 and No. 2.

Standard value: 10.5

− 13.5 ohms [at 20°C (68°F)]

Q: Is the measured resistance between 10.5 and 13.5 ohms

[at 20

°C (68°F)]?

YES : Go to Step 8.
NO : Replace the faulty injector. Then confirm that the

malfunction symptom is eliminated.

AK303075

CONNECTOR: B-26, B-27, B-30

B-30 (GR)

B-27 (GR)

B-26 (GR)

HARNESS CONNECTOR:

COMPONENT SIDE

AK000559

INJECTOR SIDE
CONNECTOR

Content .. 613 614 615 616 ..