Mitsubishi Galant. Manual — part 203

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-37

STEP 3. Check connector B-14 at volume air flow sensor
and connector C-39 at PCM for damage.
Q: Is the connector in good condition?

YES : Go to Step 4.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection(

P.00E-2

). Then go to Step 9.

STEP 4. Check for short circuit to ground between volume
air flow sensor connector B-14 terminal 7 and PCM
connector C-39 terminal 19.
Q: Is the harness wire in good condition?

YES : Replace the volume air flow sensor. Then go to Step

9.

NO : Repair it. Then go to Step 9.

ACX02480

CONNECTOR : B-14

AC

VOLUME AIR
FLOW SENSOR

AK000280

CONNECTOR : C-39

PCM

AW

ACX02480

CONNECTOR : B-14

AC

VOLUME AIR
FLOW SENSOR

AK000280

CONNECTOR : C-39

PCM

AW

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-38

STEP 5. Check the reset signal voltage at volume air flow
sensor connector B-14 by backprobing.
(1) Do not disconnect the connector B-14.
(2) Start the engine and run at idle.
(3) Measure the voltage between terminal 7 and ground by

backprobing.

•

When the engine idling, voltage should be 1.0 volt or
less.

•

When the engine speed is 3000r/min, voltage should be
between 6.0 and 9.0 volts.

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

Q: Is the voltage normal?

YES : Go to Step 8.
NO : Go to Step 6.

STEP 6. Check connector B-14 at volume air flow sensor
and connector C-39 at PCM for damage.
Q: Is the connector in good condition?

YES : Go to Step 7.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection(

P.00E-2

). Then go to Step 9.

AKX01515 AC

B-14 CONNECTOR
HARNESS
SIDE VIEW

1 2 3 4 5 6 7

ACX02480

CONNECTOR : B-14

AC

VOLUME AIR
FLOW SENSOR

AK000280

CONNECTOR : C-39

PCM

AW

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-39

STEP 7. Check for open circuit and harness damage
between volume air flow sensor connector B-14 terminal 7
and PCM connector C-39 terminal 19.
Q: Is the harness wire in good condition?

YES : Replace the PCM. Then go to Step 9.
NO : Repair it. Then go to Step 9.

STEP 8. Replace the volume air flow sensor.
(1) Replace the volume air flow sensor.
(2) Carry out a test drive with the drive cycle pattern. Refer to

P.13B-4

, Procedure 6

−

Other Monitor.

(3) Check the diagnostic trouble code (DTC).

Q: Is the DTC P0103 is output?

YES : Replace the PCM. Then go to Step 9.
NO : The inspection is complete.

STEP 9. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to

P.13B-4

, Procedure 6

−

Other Monitor.

(2) Check the diagnostic trouble code (DTC).

Q: Is the DTC P0103 is output?

YES : Retry the troubleshooting.
NO : The inspection is complete.

ACX02480

CONNECTOR : B-14

AC

VOLUME AIR
FLOW SENSOR

AK000280

CONNECTOR : C-39

PCM

AW

ACX02480

CONNECTOR : B-14

AC

VOLUME AIR
FLOW SENSOR

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-40

DTC P0107: Barometric Pressure Circuit Low Input

CIRCUIT OPERATION

•

A 5-volt voltage is supplied to the barometric
pressure sensor power terminal (terminal 1) from
the PCM (terminal 46). The ground terminal
(terminal 5) is grounded with PCM (terminal 57).

•

A voltage that is proportional to the atmospheric
pressure is sent to the PCM (terminal 55) from
the barometric pressure sensor output terminal
(terminal 2).

AK000497

7

4 5 6

1 2 3

GREEN-YELLO

W

GREEN-WHITE

BLA

CK

POWERTRAIN CONTROL
MODULE(PCM)

5V

B-14

BAROMETRIC PRESSURE SENSOR
(INCORPORATED IN VOLUME AIR
FLOW SENSOR)

1

2

5

46

55

57

C-40
(MU803781)

42 43
48 49 50 51 52 53 54 55 56 57

46

45

44

58 59

60 61 62 63

64 65 66

47

41

ACX02480

CONNECTOR : B-14

AF

BAROMETRIC
PRESSURE
SENSOR

AK000280

CONNECTOR : C-40

PCM

AV