Mitsubishi Galant. Manual — part 268
MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-297
STEP 2. Check the output circuit voltage at intermediate
connector D-15.
(1) Remove the rear seat cushion. (Refer to GROUP 52A, Rear
Seat
(2) Remove the protector.
(3) Do not disconnect intermediate connector D-15.
(4) Use special tools (MB991658 and MB991709) to connect
terminals 5, 6 and 8 between connectors of the
intermediate connector, respectively.
(5) Turn the ignition switch to the "ON" position.
(6) Remove the fuel cap.
(7) Measure the voltage between terminal 5 and ground by
backprobing.
•
Voltage should be between 2.0 and 3.0 volts.
(8) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the multi-meter reading within the specified value?
YES : Go to Step 10.
NO : Go to Step 3.
STEP 3. Check the 5-volt supply circuit voltage at
intermediate connector D-15.
(1) Do not disconnect intermediate connector D-15.
(2) Use special tools (MB991658 and MB991709) to connect
terminals 5, 6 and 8 between connectors of the
intermediate connector, respectively.
(3) Turn the ignition switch to the "ON" position.
(4) Measure the voltage between terminal 8 and ground by
backprobing.
•
Voltage should be between 4.8 and 5.2 volts.
(5) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the multi-meter reading within the specified value?
YES : Go to Step 4.
NO : Go to Step 11.
STEP 4. Check the ground circuit voltage at intermediate
connector D-15.
(1) Do not disconnect intermediate connector D-15.
(2) Use special tools (MB991658 and MB991709) to connect
terminals 5, 6 and 8 between connectors of the
intermediate connector, respectively.
(3) Turn the ignition switch to the "ON" position.
(4) Measure the voltage between terminal 6 and ground by
backprobing.
•
Voltage should be between 0.5 volts or less.
(5) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the multi-meter reading within the specified value?
YES : Go to Step 5.
NO : Go to Step 15.
AC002079 AB
MB991709
MB991658
AC002080
MB991709
MB991658
AB
AC002079 AB
MB991709
MB991658
MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-298
STEP 5. Check the output circuit voltage at fuel tank
differential pressure connector D-11.
(1) Remove the center pipe.
(2) Remove the fuel band assembly, tilt the fuel tank.
(3) Disconnect fuel tank differential pressure sensor connector
D-11.
(4) Use special tool (MB991658) to connect terminals 1, 2 and
3 of the disconnected sensor connector and those of the
harness side connector, respectively.
(5) Turn the ignition switch to the "ON" position.
(6) Remove the fuel cap.
(7) Measure the voltage between terminal 1 and ground by
backprobing.
•
Voltage should be between 2.0 and 3.0 volts.
(8) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the multi-meter reading within the specified value?
YES : Go to Step 17.
NO : Go to Step 6.
STEP 6. Check the 5-volt supply circuit voltage at fuel tank
differential pressure sensor connector D-11.
(1) Do not disconnect fuel tank differential pressure sensor
connector D-11.
(2) Use special tool (MB991658) to connect terminals 1, 2 and
3 of the disconnected sensor connector and those of the
harness side connector, respectively.
(3) Turn the ignition switch to the "ON" position.
(4) Measure the voltage between terminal 3 and ground by
backprobing.
•
Voltage should be between 4.8 and 5.2 volts.
(5) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the multi-meter reading within the specified value?
YES : Go to Step 7.
NO : Go to Step 17.
STEP 7. Check the ground circuit voltage at fuel tank
differential pressure sensor connector D-11.
(1) Disconnect fuel tank differential pressure sensor connector
D-11.
(2) Use special tool (MB991658) to connect terminals 1, 2 and
3 of the disconnected sensor connector and those of the
harness side connector, respectively.
(3) Turn the ignition switch to the "ON" position.
(4) Measure the voltage between terminal 2 and ground by
backprobing.
•
Voltage should be between 0.5 volts or less.
(5) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the multi-meter reading within the specified value?
YES : Go to Step 8.
NO : Go to Step 17.
AC002081AB
MB991658
FUEL TANK DIFFERENTIAL
PRESSURE SENSOR
AC002081AB
MB991658
FUEL TANK DIFFERENTIAL
PRESSURE SENSOR
AC002081AB
MB991658
FUEL TANK DIFFERENTIAL
PRESSURE SENSOR
MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-299
STEP 8. Check fuel tank differential pressure sensor
connector D-11 for damage.
(1) Disconnect fuel tank differential pressure sensor connector
D-11.
Q: Is there any failure at fuel tank differential pressure
sensor connector D-11?
YES : Go to Step 9.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 26.
STEP 9. Check the output voltage at fuel tank differential
pressure sensor connector D-11.
(1) Disconnect fuel tank differential pressure sensor connector
D-11.
(2) Use special tool (MB991658) to connect terminals 2 and 3
of the disconnected sensor connector and those of the
harness side connector, respectively.
(3) Turn the ignition switch to the "ON" position.
(4) Remove the fuel cap.
(5) Measure the voltage between terminal 1 and ground by
backprobing.
•
Voltage should be between 2.0 and 3.0 volts.
(6) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the multi-meter reading within the specified value?
YES : Check connectors D-15, C-71, C-17, C-41 and repair
or replace as required. Refer to GROUP 00E,
Harness Connector Inspection
. If connectors
D-15, C-71, C-17, C-41 are in good condition, check
the harness between fuel tank differential pressure
sensor connector D-11 and PCM connector C-41 for
short circuit to ground, then repair if necessary. Then
go to Step 26.
NO : Replace the fuel tank differential pressure sensor.
Then go to Step 26.
AC002041AC
CONNECTOR: D-11
FUEL TANK DIFFERENTIAL
PRESSURE SENSOR
ACX01760AB
MB991658
FUEL TANK DIFFERENTIAL
PRESSURE SENSOR
MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-300
STEP 10. Check the output circuit voltage at PCM
connector C-41.
(1) Do not disconnect the PCM connector C-41.
(2) Turn the ignition switch to the "ON" position.
(3) Remove the fuel cap.
(4) Measure the voltage between terminal 92 and ground by
backprobing.
•
Voltage should be between 2.0 and 3.0 volts.
(5) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the multi-meter reading within the specified value?
YES : Go to Step 18.
NO : Check connectors D-15, C-71, C-17, C-41 and repair
or replace as required. Refer to GROUP00E, Harness
Connector Inspection
. If connectors D-15, C-
71, C-17, C-41 are in good condition, check the
harness between intermediate connector D-15 and
PCM connector C-41 for open circuit or damage.
Then repair if necessary. Then go to Step 26.
STEP 11. Check the 5-volt supply circuit voltage at PCM
connector C-40.
(1) Do not disconnect PCM connector C-40.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 46 and ground by
backprobing.
•
Voltage should be between 4.8 and 5.2 volts.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the multi-meter reading within the specified value?
YES : Check connectors D-15, C-71, C-17, C-40 and repair
or replace as required. Refer to GROUP 00E,
Harness Connector Inspection
. If connectors
D-15, C-71, C-17, C-40 are in good condition, check
the harness between intermediate connector D-15
and PCM connector C-40 for open circuit or damage.
Then repair if necessary. Then go to Step 26 .
NO : Go to Step 12.
STEP 12. Check PCM connector C-40 for damage.
(1) Disconnect PCM connector C-40.
Q: Is there any failure at PCM connector C-40?
YES : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 26.
NO : Go to Step 13.
AC004962 AB
C-41
HARNESS SIDE
CONNECTOR
AC004963AB
C-40
HARNESS SIDE
CONNECTOR
AC005043
CONNECTOR : C-40
PCM
AC
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