Mitsubishi Galant. Manual — part 161

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-325

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 : Check the battery. Refer to GROUP 54A, Battery -

Battery check (

P.54A-5

). Then confirm that the

malfunction symptom is eliminated.

STEP 2. Check the timing belt for breaks.

Q: Is the timing belt good condition?

YES : Go to Step 3.
NO : Replace timing belt. Then confirm that the malfunction

symptom is eliminated.

STEP 3 Using scan tool MB991502, check data list.

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) Check the following items in the data List. Refer to Data List

Reference Table(

P.13A-405

).

a. Item 16: Power Supply Voltage.
b. Item 22: Crankshaft Position Sensor.

c. Item 21: Engine Coolant Temperature Sensor.

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

Q: Are they operating properly?

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

symptom is eliminated.

STEP 4. 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.13A-416

).

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 5.
NO : Repair or replace.Then confirm that the malfunction

symptom is eliminated.

AC003081 AB

16 PIN

MB991502

AC003081 AB

16 PIN

MB991502

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-326

STEP 5. Check the ignition system.
(1) Connect the tachometer to inspection connector A-16X

terminal 3.

(2) Crank the engine.

•

The tachometer should indicate cranking speed.

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

Q: Is the cranking speed normal?

YES : Go to Step 6.
NO : Refer to INSPECTION PROCEDURE 32

−

Ignition

Circuit System(

P.13A-396

).

STEP 6. Check the ignition timing.
(1) Check the ignition timing at cranking.

Standard value:5

°°°°

BTDC

φφφφ

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 harness connector B-17 or B-19 or B-21 or
B-22 at injector for damage.
Q: Is the harness connector in good condition?

YES : Go to Step 8.
NO : :Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection(

P.00E-2

). Then confirm that the

malfunction symptom is eliminated.

AK000637

CONNECTOR:A-16X

INSPECTION
CONNECTOR

AB

AK000557 AB

B-21

B-19

B-17

B-22

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

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-327

STEP 8. Check the injector.
(1) Disconnect the injector connector B-17, B-19, B-21, B-22.
(2) Measure the resistance between each 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 9.
NO : Repair the injector. Then confirm that the malfunction

symptom is eliminated.

STEP 9. Check connector C-39 at PCM for damage.
Q: Is the connector in good condition?

YES : Go to Step 10.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection(

P.00E-2

). Then confirm that the

malfunction symptom is eliminated.

AK000557 AB

B-21

B-19

B-17

B-22

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

AK000559

2

1

INJECTOR SIDE
CONNECTOR

AB

AK000280

CONNECTOR : C-39

PCM

AW

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-328

STEP 10. 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.

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

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

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

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

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

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

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.

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

).

AK000557 AB

B-21

B-19

B-17

B-22

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

AK000280

CONNECTOR : C-39

PCM

AW