Mitsubishi Galant 9G. Manual — part 1107
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-728
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 Malfunctions
). Go to
Step 17.
NO : Repair the damaged harness wires. Then go to Step
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-729
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
(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-730
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
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-731
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
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
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)
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