Mitsubishi Galant (2004+). Manual — part 1253

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-705

STEP 10. Check PCM connector B-20, intermediate
connector C-25 and fuel tank differential pressure sensor
connector D-23 for loose, corroded or damaged terminals,
or terminals pushed back in the connector.

Q: Are the connectors and terminals in good condition?

YES : Go to Step 11.
NO : Repair or replace the faulty components (Refer to

GROUP 00E, Harness Connector Inspection

P.00E-2

). Then go to Step 17.

AC306248

B-20 HARNESS

CONNECTOR:

COMPONENT SIDE

AB

B-20

CONNECTOR: B-20

PCM

AIR
CLEANER

AC305231

CONNECTOR: C-25

AM

C-25

AC305266

CONNECTOR: D-23

AB

D-23 (B)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-706

STEP 11. Check the harness wire between PCM connector
B-20 terminal 21 and fuel tank differential pressure sensor
connector D-23 terminal 3 for damage.

Q: Are the harness wires in good condition?

YES : It can be assumed that this malfunction is intermittent

(Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points

− How to

Cope with Intermittent Malfunction

P.00-6

). Go to

Step 17.

NO : Repair the damaged harness wires. Then go to Step

17.

AC306248

B-20 HARNESS

CONNECTOR:

COMPONENT SIDE

AB

B-20

CONNECTOR: B-20

PCM

AIR
CLEANER

AC305266

CONNECTOR: D-23

AB

D-23 (B)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-707

STEP 12. Measure the fuel tank differential pressure
sensor return voltage at fuel tank differential pressure
sensor connector D-23.

(1) Remove the rear seat cushion assembly (Refer to GROUP

52A, Rear Seat

P.52A-30

).

(2) Remove the hole cover (RH).

(3) Disconnect fuel tank differential pressure sensor connector

D-23.

(4) Use special tool MB991658 to connect terminals 1,2 and 3

of the fuel tank differential pressure sensor connector D-23.

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

• The voltage should measure 0.5 volt or less.

(7) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage 0.5 volt or less?

YES : Go to Step 13.
NO : Go to Step 17.

AC306089

HOLE COVER

AB

AC305266

CONNECTOR: D-23

AB

D-23 (B)

AC306775

AB

MB991658

1 2 3

D-23 (B)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-708

STEP 13. Check PCM connector B-20, intermediate
connector C-25 and fuel tank differential pressure sensor
connector D-23 for loose, corroded or damaged terminals,
or terminals pushed back in the connector.

Q: Are the connectors and terminals in good condition?

YES : Go to Step 14.
NO : Repair or replace the faulty components (Refer to

GROUP 00E, Harness Connector Inspection

P.00E-2

). Then go to Step 17.

AC306248

B-20 HARNESS

CONNECTOR:

COMPONENT SIDE

AB

B-20

CONNECTOR: B-20

PCM

AIR
CLEANER

AC305231

CONNECTOR: C-25

AM

C-25

AC305266

CONNECTOR: D-23

AB

D-23 (B)