Mitsubishi Galant. Manual — part 140

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-241

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

P.00E-2

. 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.

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 GROUP 00E,
Harness Connector Inspection

P.00E-2

. 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 .

ACX01760AB

MB991658

FUEL TANK DIFFERENTIAL

PRESSURE SENSOR

AC004962 AB

C-41

HARNESS SIDE
CONNECTOR

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-242

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

P.00E-2

. 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

P.00E-2

. Then go to Step 26.

NO : Go to Step 13.

STEP 13. Check the sensor power supply line for short
circuit to ground at PCM connector C-40.
(1) Disconnect PCM connector C-40 and measure at the

harness side.

(2) Check for the continuity between terminal 46 and ground.

•

There should be 2 ohms or more.

Q: Does the multi-meter reading exceed the specified

value?
YES : Go to Step 26.
NO : Go to Step 14.

AC004963AB

C-40

HARNESS SIDE
CONNECTOR

AC005043

CONNECTOR : C-40

PCM

AC

AC004964 AB

C-40

HARNESS SIDE
CONNECTOR

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-243

STEP 14. Check the sensor power supply lines.
(1) Check all the sensor power supply lines for damage, which

flow through the harness PCM connector (terminal 46.)

Q: Is there any failure in the sensor power supply lines?

When a failure is found : Repair if necessary. (Refer to

GROUP 90, Circuit Diagrams

−

MFI System <2.4L

ENGINE>

P.90-30

. Then go to Step 26.)

STEP 15. Check the ground 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 57 and ground by

backprobing.

•

Voltage should be 0.5 volts or less.

(4) Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the multi-meter reading below 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

P.00E-2

. 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 16.

STEP 16. 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

P.00E-2

. Then go to Step 26.

NO : Go to Step 26.

AC004965 AB

C-40

HARNESS SIDE
CONNECTOR

AC005043

CONNECTOR : C-40

PCM

AC

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-244

STEP 17. Check the harness between fuel tank differential
pressure sensor connector D-11 and intermediate
connector D-15 for open circuit or damage.
(1) Disconnect fuel tank differential pressure sensor connector

D-11 and intermediate connector D-15.

Q: Is there any failure between fuel tank differential

pressure sensor connector D-11 and intermediate
connector D-15?
YES : Repair it. Then go to Step 26.
NO : Check connectors D-11, D-15 and repair or replace as

required. Refer to GROUP 00E, Harness Connector
Inspection

P.00E-2

. Then go to Step 26.

STEP 18. Check PCM connector C-41 for damage.
(1) Disconnect PCM connector C-41.

Q: Is there any failure at PCM connector C-41?

YES : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. Then go to Step 26.

NO : Go to Step 19.

AC002041AC

CONNECTOR: D-11

FUEL TANK DIFFERENTIAL
PRESSURE SENSOR

AC002549AC

CONNECTOR: D-15

INTERMEDIATE
CONNECTOR

AC005043

CONNECTOR : C-41

PCM

AD