Mitsubishi Galant. Manual — part 172

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-369

STEP 12. Check the following items.
(1) Check the following items, and repair or replace the

defective items.

a. Check the injectors for fuel leakage.
b. Check the ignition coil, spark plugs, spark plug cables.

c. Check compression pressure.

d. Check the positive crankcase ventilation system.
e. Check the evaporative emission control system.

(2) Then check the malfunction symptom.

Q: Is the malfunction symptom is eliminated?

YES : The check is completed.
NO : Replace the catalytic converter. Then confirm that the

malfunction symptom is eliminated.

INSPECTION PROCEDURE 24: Purge Flow Test of the Evaporative Emission Canister Failure.

COMMENT

•

The test fails when the purge line or purge port is
clogged or if the evaporative emission purge
solenoid fails.

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

•

Purge line or purge port is clogged.

•

Malfunction of the evaporative emission purge
solenoid.

•

Evaporative emission canister is clogged.

DIAGNOSIS

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

STEP 1. 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.13A-20

).

NO : Refer to GROUP 17, Emission Control System-Purge

Control System Check (Purge Flow Check) (

P.17-85

).

INSPECTION PROCEDURE 25: Pressure Test of the Evaporative System Failure.

COMMENT

•

The test fails if there is a leak from the fuel tank or
vapor line.

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

•

Loose fuel tank filler tube cap.

AC003081 AB

16 PIN

MB991502

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-370

•

Broken seal in fuel tank, vapor line evaporative
emission canister.

DIAGNOSIS

STEP 1. Check the evaporative emission purge solenoid
Refer to GROUP 17, Emission Control System

−

Evaporative

Emission Purge Solenoid Check(

P.17-86

).

Q: Is the evaporative emission purge solenoid normal?

YES : Go to Step 2.
NO : Repair or replace. Then confirm that the malfunction

symptom is eliminated.

STEP 2. Check the evaporative emission ventilation
solenoid.
Refer to GROUP 17, Emission Control System

−

Evaporative

Emission Ventilation Solenoid Check (

P.17-88

).

Q: Is the evaporative emission ventilation solenoid

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

defective items.

a. Check for leaks from the vapor line or

evaporative emission canister.

b. Check for leaks from the fuel tank.

Then confirm that the malfunction symptom is

eliminated.

NO : Repair or replace. Then confirm that the malfunction

symptom is eliminated.

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-371

INSPECTION PROCEDURE 26: Generator output voltage is low (approximately 12.3 volts)

AK000479

4

3

2

6

3 4
7 8

1 2

5

1

BL

ACK

-RED

BL

ACK

-RED

POWERTRAIN CONTROL
MODULE(PCM)

GENERATOR

VOLTAGE
REGULATOR

B-46
(MU802046)

1

2

B-11
MU802749

8

C-39
(MU803784)

2

3 4

5 6

7 8

9

11 12 13 14 15 16 17 18 19 20

30

21 22 23

24 25

26 27 28 29

3132 33

34 35

1

10

AK000569 AB

CONNECTOR:B-11

AK000568

CONNECTOR:B-46

AB

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-372

CIRCUIT OPERATION

•

The PCM controls generator out put current by
duty-controlling continuity between the generator
G terminal (terminal 1) and ground.

TROUBLESHOOTING HINTS (The most likely
causes for this charging system:)

•

Malfunction of the charging system.

•

Short circuit in harness between generator G
terminal and PCM.

•

PCM failed.

DIAGNOSIS

STEP 1. Check the voltage at generator intermediate
connector B-11 by backprobing
(1) Do not disconnect the connector B-11.
(2) Start the engine and run at idle.
(3) Measure the voltage between terminal 2 and ground by

backprobing.

a. Engine: warming up
b. Radiator fan: stopped

c. Headlight switch: OFF to ON

d. Rear defogger switch: OFF to ON
e. Stoplight switch: OFF to ON

•

Voltage rises by 0.2-3.5 volts.

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

Q: Is the voltage normal?

YES : Replace the generator. Then confirm that the

malfunction symptom is eliminated.

NO : Go to Step 2.

STEP 2. Check connector B-11 at generator intermediate
connector for damage.
Q: Is the connector in good condition?

YES : Go to Step 3.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection(

P.00E-2

). Then confirm that the

malfunction symptom is eliminated.

AK000280

CONNECTOR : C-39

PCM

AW

AK000365

1
5

2
6

3
7

4
8

B-11 CONNECTOR
HARNESS SIDE VIEW

AC

AK000569 AB

CONNECTOR:B-11