Mitsubishi Galant 9G. Manual — part 1204

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-1116

STEP 8. Measure the power supply voltage at fuel pump
relay 2 harness side connector C-208.

CAUTION

Because it is difficult to distinguish the top and bottom of
the fuel pump relay connector at the wiring harness,
inspect it by using the triangle mark on the junction block
as a reference.
(1) Disconnect the connector C-208 and measure at the

harness side.

(2) Turn the ignition switch to the "ON" position.

(3) Measure the voltage between terminal No. 3 and ground.

• Voltage should be battery positive voltage.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is battery positive voltage (approximately 12 volts)

present?
YES : Go to Step 9.
NO : Check harness connector C-215 at intermediate

connector for damage, and repair or replace as
required. Refer to, GROUP 00E, Harness Connector
Inspection

P.00E-2

. If intermediate connector is in

good condition, repair harness wire between ignition
switch connector C-308 (terminal No. 2) and fuel
pump relay 2 connector C-208 (terminal No. 3)
because of open circuit. Then confirm that the
malfunction symptom is eliminated.

STEP 9. Check connector D-18 at fuel pump 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.

3
4

1
2

3
4

1
2

3
4

1
2

AK203272

JUNCTION BLOCK

C-208

HARNESS CONNECTOR:
COMPONENT SIDE

CONNECTOR: C-208

AB

1 3

4

2

AK203274

C-208 HARNESS
CONNECTOR:
COMPONENT SIDE

AB

JUNCTION
BLOCK
TRIANGLE
MARK

1

2

3

4

5

AK303159

SERVICE
HOLE

AB

FUEL PUMP MODULE
(INCORPORATING FUEL
LEVEL SENSOR (MAIN)
AND FUEL TANK
TEMPERATURE SENSOR)

CONNECTOR: D-18

D-18 (GR)

HARNESS
CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-1117

STEP 10. Check the fuel pump operation.
(1) Disconnect fuel pump connector D-18.

(2) Use jumper wires to connect fuel pump connector terminal

No. 5 to the positive battery terminal and terminal No. 4 to
the negative battery terminal.

• An operating sound of the fuel pump should be heard.

Q: Is the fuel pump operating properly?

YES : Go to Step 11.
NO : Replace the fuel pump. Then confirm that the

malfunction symptom is eliminated.

STEP 11. Check for continuity at fuel pump harness side
connector D-18.
(1) Disconnect the connector D-18 and measure at the harness

side.

(2) Check for the continuity between terminal No. 4 and

ground.

• Should be less than 2 ohms.

Q: Does continuity exist?

YES : Go to Step 12.
NO : Repair harness wire between fuel pump connector

D-18 (terminal No. 4) and ground because of open
circuit. or harness damage. Then confirm that the
malfunction symptom is eliminated.

1

2

3

4

5

AK303159

SERVICE
HOLE

AB

FUEL PUMP MODULE
(INCORPORATING FUEL
LEVEL SENSOR (MAIN)
AND FUEL TANK
TEMPERATURE SENSOR)

CONNECTOR: D-18

D-18 (GR)

HARNESS
CONNECTOR:
COMPONENT SIDE

AKX01439

FUEL PUMP SIDE
CONNECTOR

AB

1 2 3

4 5

1

2

3

4

5

AK303159

SERVICE
HOLE

AB

FUEL PUMP MODULE
(INCORPORATING FUEL
LEVEL SENSOR (MAIN)
AND FUEL TANK
TEMPERATURE SENSOR)

CONNECTOR: D-18

D-18 (GR)

HARNESS
CONNECTOR:
COMPONENT SIDE

AK303266 AB

1

2

3

4

5

D-18 HARNESS CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-1118

STEP 12. Check for open circuit and short circuit to
ground and harness damage between fuel pump relay 2
connector C-208 (terminal No. 4) and fuel pump connector
D-18 (terminal No. 5).
NOTE: Check harness after checking intermediate connector
C-204. If intermediate connector is damaged, repair or replace
it. After to GROUP 00E, Harness Connector Inspection

P.00E-2

. Then check that the malfunction is eliminated.

Q: Is the harness wire in good condition?

YES : Go to Step 13.
NO : Repair it. Then confirm that the malfunction symptom

is eliminated.

STEP 13. Check connector B-19 at PCM 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.

3
4

1
2

3
4

1
2

3
4

1
2

AK203272

JUNCTION BLOCK

C-208

HARNESS CONNECTOR:
COMPONENT SIDE

CONNECTOR: C-208

AB

1

2

3

4

5

AK303159

SERVICE
HOLE

AB

FUEL PUMP MODULE
(INCORPORATING FUEL
LEVEL SENSOR (MAIN)
AND FUEL TANK
TEMPERATURE SENSOR)

CONNECTOR: D-18

D-18 (GR)

HARNESS
CONNECTOR:
COMPONENT SIDE

AK303153

4 3 2 1

7 6 5

9 8

11 10

14 13 12

18 17 16 15

CONNECTOR: B-19

PCM

AB

AIR CLEANER

HARNESS CONNECTOR:
COMPONENT SIDE

B-19 (B)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-1119

STEP 14. Measure the power supply voltage at PCM
connector B-19.
(1) Disconnect the connector B-19 and measure at the harness

side.

(2) Turn the ignition switch to the "ON" position.

(3) Measure the voltage between terminal No. 6 and ground.

• Voltage should be battery positive voltage.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is battery positive voltage (approximately 12 volts)

present?
YES : Replace the PCM. Then confirm that the malfunction

symptom is eliminated.

NO : Check harness connectors C-29 and C-211 at

intermediate connector for damage, and repair or
replace as required. Refer to, GROUP 00E, Harness
Connector Inspection

P.00E-2

. If intermediate

connectors are in good condition, repair harness wire
between fuel pump relay 2 connector C-208 (terminal
No. 2) and PCM connector B-19 (terminal No. 6)
because of open circuit. Then confirm that the
malfunction symptom is eliminated.

AK303153

4 3 2 1

7 6 5

9 8

11 10

14 13 12

18 17 16 15

CONNECTOR: B-19

PCM

AB

AIR CLEANER

HARNESS CONNECTOR:
COMPONENT SIDE

B-19 (B)

4 3 2 1

7 6 5

9 8

11 10

14 13 12

18 17 16 15

AK303267

B-19 HARNESS
CONNECTOR:
COMPONENT SIDE

AB