Mitsubishi Galant (2004+). Manual — part 1252
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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-701
(5) Measure the voltage between terminal 22 and ground.
• The voltage should measure 0.5 volt or less.
(6) Install the fuel cap.
(7) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage 0.5 volt or less?
YES : Go to Step 6.
NO : Go to Step 9.
STEP 6. Measure the signal voltage at intermediate
connector D-23.
(1) Remove the rear seat cushion assembly (Refer to GROUP
52A, Rear Seat
(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) Remove the fuel cap.
(7) Measure the voltage between connector D-23 terminal 1
and ground.
• The voltage should measure between 2.0 and 3.0 volts.
(8) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage between 2.0 and 3.0 volts?
YES : Go to Step 7.
NO : Go to Step 15.
AC211193 AB
SPECIAL TOOL 23-PIN
CONNECTOR
(WITHOUT RED TAPE):
COMPONENT SIDE
AC306089
HOLE COVER
AB
AC305266
CONNECTOR: D-23
AB
D-23 (B)
AC306775
AB
MB991658
1 2 3
D-23 (B)
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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-702
STEP 7. 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 8.
NO : Repair or replace the faulty components (Refer to
GROUP 00E, Harness Connector Inspection
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)
![](/vehicles/winoney/jucether/plouro/belda.png)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-703
STEP 8. Check the harness wire between PCM connector
B-20 terminal 23 and fuel tank differential pressure sensor
connector D-23 terminal 1 for damage.
Q: Is the harness wire in good condition?
YES : This malfunction is intermittent (Refer to GROUP 00,
How to Use Troubleshooting/Inspection Service
Points - How to Cope with Intermittent Malfunction
). Go to Step 17.
NO : Repair the damaged harness wire. 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)
![](/vehicles/winoney/jucether/plouro/tounfi.png)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-704
STEP 9. Measure the 5-volt reference signal at fuel tank
differential pressure sensor connector D-23.
(1) Remove the rear seat cushion assembly (Refer to GROUP
52A, Rear Seat
(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 3 and ground.
• The voltage should measure between 4.9 and 5.1 volts.
(7) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage between 4.9 and 5.1 volts?
YES : Go to Step 12.
NO : Go to Step 10.
AC306089
HOLE COVER
AB
AC305266
CONNECTOR: D-23
AB
D-23 (B)
AC306775
AB
MB991658
1 2 3
D-23 (B)
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