Mitsubishi Galant 9G. Manual — part 1123
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-792
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-793
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-794
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)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-795
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 H 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.
(9) Connect hose H to the evaporative emission canister.
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
AC306778
AC
HOSE H
PLUG
AC306661
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