Mitsubishi Galant 9G. Manual — part 1105
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-720
(1) Disconnect all the connectors from the PCM.
(2) Connect special tool MB991923 (check harness) between
the PCM and the body-side harness connector.
(3) Turn the ignition switch to the "ON" position.
AC306248
B-20 HARNESS
CONNECTOR:
COMPONENT SIDE
AB
B-20
CONNECTOR: B-20
PCM
AIR
CLEANER
AC209793AJ
SPECIAL TOOL 23-PIN CONNECTOR
WITHOUT RED TAPE
(PCM CONNECTOR B-20)
B-20
PCM
MB991923
BODY SIDE
HARNESS
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-721
(4) Measure the voltage between terminal 21 and ground.
• The voltage should measure between 4.9 and 5.1 volts.
(5) 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 5.
NO : Go to Step 4.
STEP 4. Check PCM connector B-20 for loose, corroded or
damaged terminals, or terminals pushed back in the
connector.
Q: Are the connector and terminals in good condition?
YES : Go to Step 16.
NO : Repair or replace the faulty components. (Refer to
GROUP 00E, Harness Connector Inspection
AC211192AB
SPECIAL TOOL 23-PIN
CONNECTOR
(WITHOUT RED TAPE):
COMPONENT SIDE
AC306248
B-20 HARNESS
CONNECTOR:
COMPONENT SIDE
AB
B-20
CONNECTOR: B-20
PCM
AIR
CLEANER
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-722
STEP 5. Measure the sensor output voltage at PCM
connector B-20 by using check harness special tool
MB991923.
(1) Disconnect all the connectors from the PCM.
(2) Connect special tool MB991923 (check harness) between
the PCM and the body-side harness connector.
(3) Turn the ignition switch to the "ON" position.
(4) Remove the fuel cap.
AC306248
B-20 HARNESS
CONNECTOR:
COMPONENT SIDE
AB
B-20
CONNECTOR: B-20
PCM
AIR
CLEANER
AC209793AJ
SPECIAL TOOL 23-PIN CONNECTOR
WITHOUT RED TAPE
(PCM CONNECTOR B-20)
B-20
PCM
MB991923
BODY SIDE
HARNESS
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-723
(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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