Mitsubishi Galant. Manual — part 295

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-405

STEP 8. Check the right bank injector resistance at injector
intermediate connector B-26.
(1) Disconnect the injector intermediate connector B-26.
(2) Measure the resistance between each male connector side

terminal.

a. Measure the resistance between terminal 1 and 2 when

measuring No.1 cylinder injector

b. Measure the resistance between terminal 1 and 3 when

measuring No.3 cylinder injector

c. Measure the resistance between terminal 1 and 4 when

measuring No.5 cylinder injector

•

Resistance should be between 13 and 16 ohm [at 20

°

C

(68

°

F)].

Q: Is the resistance normal?

YES : Go to Step 11.
NO : Go to Step 9.

STEP 9. Check the right bank injector.
(1) Remove the intake manifold.
(2) Disconnect the right bank injector connector, which

deviates from the standard value at Step 8.

(3) Measure the resistance between injector side connector

terminal 1 and 2.

Standard value: 13

−−−−

16 ohm [at 20

°°°°

C (68

°°°°

F)]

Q: Is the resistance standard value?

YES : Go to Step 10.
NO : Replace the injector. Then confirm that the

malfunction symptom is eliminated.

AK000618

AB

CONNECTOR:B-26

AK000447

1 2

3 4

INJECTOR
INTERMEDIATE
CONNECTOR

AB

AK000618AC

CONNECTORS:B-19,B-22,B-25

B-25

B-19

B-22

AK000559

2

1

INJECTOR SIDE
CONNECTOR

AB

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-406

STEP 10. Check connector B-19 or B-22 or B-25 at right
bank injector for damage.
(1) Check the injector connector, which deviates from the

standard value at Step 8.

Q: Is the connector in good condition?

YES : Repair harness wire between injector intermediate

connector and right bank injector connector because
of harness damage. Then confirm that the
malfunction symptom is eliminated.

NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection(

P.00E-2

). Then confirm that the

malfunction symptom is eliminated.

STEP 11. Check connector B-26 at injector intermediate
connector for damage.
Q: Is the connector in good condition?

YES : Go to Step 12.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection(

P.00E-2

). Then confirm that the

malfunction symptom is eliminated.

STEP 12. Check connector B-17, B-21, B-30 at left bank
injector for damage.
Q: Is the connector in good condition?

YES : Go to Step 13.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection(

P.00E-2

). Then confirm that the

malfunction symptom is eliminated.

AK000618AC

CONNECTORS:B-19,B-22,B-25

B-25

B-19

B-22

AK000618

AB

CONNECTOR:B-26

AK000618 AD

CONNECTORS:B-17,B-21,B-30

B-30

B-17

B-21

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-407

STEP 13. Check connector C-39 for damage.
Q: Is the connector in good condition?

YES : Go to Step 14.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection(

P.00E-2

). Then confirm that the

malfunction symptom is eliminated.

STEP 14. Check for harness damage between injector
connector and PCM connector.

a. Check the harness wire between injector connector B-22

terminal 2 and PCM connector C-39 terminal 1 when
checking No.1 cylinder injector.

b. Check the harness wire between injector connector B-21

terminal 2 and PCM connector C-39 terminal 9 when
checking No.2 cylinder injector.

c. Check the harness wire between injector connector B-19

terminal 2 and PCM connector C-39 terminal 24 when
checking No.3 cylinder injector.

d. Check the harness wire between injector connector B-17

terminal 2 and PCM connector C-39 terminal 2 when
checking No.4 cylinder injector.

e. Check the harness wire between injector connector B-25

terminal 2 and PCM connector C-39 terminal 10 when
checking No.5 cylinder injector.

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

terminal 2 and PCM connector C-39 terminal 25 when
checking 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, spark plugs, spark plug

cables.

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.

AK000280

CONNECTOR : C-39

PCM

AW

AK000618

AK000618 AE

CONNECTORS:B-17,B-19,B-21,B-22,B-25,B-30

B-25

B-19

B-22

B-30

B-17

B-21

AK000280

CONNECTOR : C-39

PCM

AW

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-408

INSPECTION PROCEDURE 6: Fires 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.

•

Malfunction of the PCM.

DIAGNOSIS

Required Special Tool:
MB991502: Scan Tool (MUT-II)

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

•

The voltage should be 8 volts or more.

Q: Is the voltage normal?

YES : Go to Step 2.
NO : Refer to GROUP 54A, Battery-Battery check(

P.54A-

5

).

STEP 2. Using scan tool MB991502, read the diagnostic
trouble code (DTC).

CAUTION

To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK"(OFF) position before
connecting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 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 is output?

YES : Refer to, Diagnostic Trouble Code Chart(

P.13B-19

).

NO : Go to Step 3.

STEP 3. Using scan tool MB991502, check actuator test.
(1) Turn the ignition switch to the "ON" position.
(2) Check the following items in the actuator test. Refer to,

Actuator Test Reference Table(

P.13B-499

).

a. Item 07: Fuel Pump.

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

Q: Is the actuator operating properly?

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

symptom is eliminated.

AC003081 AB

16 PIN

MB991502

AC003081 AB

16 PIN

MB991502