Mitsubishi Galant. Manual — part 308

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-457

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.

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

AK000522

4

3

2

6

3 4
7 8

1 2
5

1

BLA

CK-RED

BLA

CK-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

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-458

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.

AK000620 AB

CONNCTOR:B-11

AK000617

CONNECTOR:B-46

AF

AK000280

CONNECTOR : C-39

PCM

AW

AK000365

1
5

2
6

3
7

4
8

B-11 CONNECTOR
HARNESS SIDE VIEW

AC

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-459

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.

STEP 3. Check connector B-46 at generator connector for
damage.
Q: Is the connector in good condition?

YES : Go to Step 4.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection(

P.00E-2

). Then confirm that the

malfunction symptom is eliminated.

STEP 4. Check connector C-39 at PCM for damage.
Q: Is the connector in good condition?

YES : Go to Step 5.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection(

P.00E-2

). Then confirm that the

malfunction symptom is eliminated.

AK000620 AB

CONNCTOR:B-11

AK000617

CONNECTOR:B-46

AF

AK000280

CONNECTOR : C-39

PCM

AW

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-460

STEP 5. Check for open circuit and short circuit to ground
and harness damage between generator connector B-46
terminal 1 and PCM connector C-39 terminal 8.
Q: Is the harness wire in good condition?

YES : Replace the PCM. Then confirm that the malfunction

symptom is eliminated.

NO : Repair it. Then confirm that the malfunction symptom

is eliminated.

AK000617

CONNECTOR:B-46

AF

AK000280

CONNECTOR : C-39

PCM

AW