Mitsubishi Galant 9G. Manual - part 811

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-686

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-29

).

(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) <2.4L ENGINE>

13A-687

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)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-688

STEP 14. Check the harness wires between PCM 
connector B-20 terminal 22 and fuel tank differential 
pressure sensor connector D-23 terminal 2 for damage.
Q: Are the harness wires in good condition?

YES : Go to Step 17.
NO :  Repair the damaged harness wires. Then go to Step 

17.

STEP 15. Check fuel tank differential pressure sensor 
connector D-23 for loose, corroded or damaged terminals, 
or terminals pushed back in the connector.
Q: Is the connectors and terminals in good condition?

YES : Replace the fuel tank differential pressure sensor. 

Then go to Step 17.

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

AC305266

CONNECTOR: D-23

AB

D-23 (B)

AC305266

CONNECTOR: D-23

AB

D-23 (B)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-689

STEP 16. Using scan tool MB991958, check data list item 
73: Fuel Tank Differential Pressure Sensor.

CAUTION

To prevent damage to scan tool MB991958, always turn the 
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958 to the data link connector.

(2) Disconnect hose I from the evaporative emission canister, 

and plug the hose.

(3) Turn the ignition switch to the "ON" position.
(4) Remove the fuel cap.
(5) Set scan tool MB991958 to the data reading mode.

• Item 73, Fuel Tank Differential Pressure Sensor.

• The fuel tank pressure reading on the scan tool 

should be 

−1.5 to 1.5 kPa (−0.443 to 0.443 inHg).

(6) Connect the evaporative emission system pressure pump 

(Miller number 6872A) to the fuel tank filler tube by using 
fuel tank adapter (MLR-8382) and pressurize the fuel tank.

• The fuel tank pressure reading should increase.

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

disconnect scan tool MB991958.

(8) Remove  the evaporative emission system pressure pump 

(Miller number 6872A) and the fuel tank adapter 
(MLR-8382), and reinstall the fuel cap.

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

AC306778

AB

HOSE I

PLUG

AC306661