Mitsubishi Galant. Manual — part 177

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-389

STEP 6. Check the fuel pump relay
(1) Remove the fuel pump relay.
(2) Check for continuity between the fuel pump relay terminals

2 and 4.

•

There should be continuity (approximately 70Ω)

(3) Use jumper wires to connect fuel pump relay terminal 4 to

the positive battery terminal and terminal 2 to the negative
battery terminal.

(4) Check the continuity between the fuel pump relay terminals

1 and 3 while connecting and disconnecting the jumper
wire at the negative battery terminal.

•

Should be less than 2 ohm. (Negative battery terminal
connected)

•

Should be open loop. (Negative battery terminal
disconnected)

(5) Install the fuel pump relay.

Q: Is the resistance normal?

YES : Go to Step 7.
NO : Replace the fuel pump relay. Then confirm that the

malfunction symptom is eliminated

AK000641

CONNECTOR:A-20X

FUEL PUMP
RELAY

AB

AK000369AC

FUEL PUMP RELAY
SIDE CONNECTOR

1 2
3 4

AK000370AC

FUEL PUMP RELAY
SIDE CONNECTOR

1 2
3 4

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-390

STEP 7. Check the power supply voltage at fuel pump relay
connector A-20X.
(1) Disconnect the connector A-20X and measure at the

harness side.

(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 3, 4 and ground.

•

Voltage should be battery positive voltage.

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

Q: Is the voltage normal?

YES : Go to Step 8.
NO : Check harness connectors C-04, C-66 and C-73 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 ignition switch connector C-58 terminal 2
and fuel pump relay connector A-20X terminal 3, 4
because of open circuit. Then confirm that the
malfunction symptom is eliminated.

STEP 8. Check for open circuit and short circuit to ground
and harness damage between fuel pump relay connector
A-20X terminal 1 and fuel pump connector D-14 terminal 5.
NOTE: Check harness after checking intermediate connectors
C-17 and C-71. If intermediate connectors are damaged, repair
or replace them. Refer 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 9.
NO : Repair it. Then confirm that the malfunction symptom

is eliminated.

AKX01441

A-20X HARNESS
SIDE CONNECTOR

1

2

3

4

AC

AK000641

CONNECTOR:A-20X

FUEL PUMP
RELAY

AB

AK000565

CONNECTOR:D-14

AC

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-391

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.

STEP 10. Check the power supply voltage at PCM
connector C-39.
(1) Disconnect the connector C-39 and measure at the harness

side.

(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 21 and ground.

•

Voltage should be battery positive voltage.

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

Q: Is the voltage normal?

YES : Replace the PCM. Then confirm that the malfunction

symptom is eliminated.

NO : Repair harness wire between fuel pump relay

connector A-20X terminal 2 and PCM connector C-39
terminal 21because of open circuit. Then confirm that
the malfunction symptom is eliminated.

AK000280

CONNECTOR : C-39

PCM

AW

AK000409

C-39 HARNESS
SIDE CONNECTOR

AC

8 7

6 5

4 3

2

1
9

10

11

12

13

14

15

16

17

18

19

20

21

22

23
35 34

3332 3130

2928 27 26

25 24

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-392

INSPECTION PROCEDURE 31: Ignition Switch-ST System and Park/Neutral Position Switch System.

AK000484

7

10

5

3

1 2

4

6

9

4 5 6

1 2 3

8

BLA

CK-RED

BLA

CK-

YELLO

W

BLA

CK-

YELLO

W

ACC

C-58

R

IGNITION
SWITCH

IG2

IG1

ST

LOCK

5

C-40
(MU803781)

POWERTRAIN CONTROL
MODULE(PCM)

58

PARK/
NEUTRAL
POSITION
SWITCH

B-39
MU802355

L

2

3

D

N

R

P

10

9

16

C-17

7 8

5

3 4

35

34

10 11 12

2122 23 24

13 14 15

25 26 27

16

28

17

18 19 20

29

30 31

32 33

36 37

38

9

1 2

6

42 43
48 49 50 51 52 53 54 55 56 57

46

45

44

58 59

60 61 62 63

64 65 66

47

41