Mitsubishi Eclipse. Manual — part 374

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 airflow sensor connector B-14 (terminal
No. 7) and ECM connector C-51 (terminal No. 19) <M/T> or
PCM connector C-52 (terminal No. 19) <A/T>.
Q: Is the harness wire in good condition?

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

AK300078

3

4

5

1

2

6

7

CONNECTOR: B-14

AB

B-14 (B)

HARNESS
CONNECTOR:
COMPONENT SIDE

AK300443

2

3

4

5

6

7

8

9

11

12

13

14

15

16

17

18

19

20

30

21

22

23

24

25

26

27

28

29

31

32

33

34

35

1

10

CONNECTOR: C-51 <M/T>

C-51 (GR)

AB

HARNESS CONNECTOR:
COMPONENT SIDE

AK300458

2

3

4

5

6

7

8

9

11

12

13

14

15

16

17

18

19

20

30

21

22

23

24

25

26

27

28

29

31

32

33

34

35

1

10

CONNECTOR: C-52 <A/T>

C-52 (GR)

AB

HARNESS CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-40

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

Diagnostic Function

− OBD-II Drive Cycle − Procedure 6 −

Other Monitor

P.13B-7

.

(3) Check the diagnostic trouble code (DTC).
Q: Is DTC P0101 set?

YES : Replace the ECM or 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

Diagnostic Function

− OBD-II Drive Cycle − Procedure 6 −

Other Monitor

P.13B-7

.

(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0101 set?

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

AK300078

3

4

5

1

2

6

7

CONNECTOR: B-14

AB

B-14 (B)

HARNESS
CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-41

DTC P0102: Volume Airflow Circuit Low Input

AK301583

65

43
50

42
49

41
48
60 61

64

46 47
58 59
67 68

45

56
66

52

51

44

53

62

54

63

57

55

1 2 3 4 5 6 7

RED

RED-

WHITE

RED-

WHITE

RED-

WHITE

GREEN-BLUE

BR

O

W

N

WHITE-GREEN

B-14

BATTERY

VOLUME AIRFLOW
SENSOR

5 V

19<M/T>*1
19<A/T>*3

7

4

5

3

ENGINE CONTROL MODULE (ECM) <M/T>
OR
POWERTRAIN CONTROL MODULE (PCM) <A/T>

MFI
RELAY

1

2

4

3

34<M/T>*1
16<A/T>*3

61<M/T>*2
65<A/T>*4

C-51 <M/T>, C-52 <A/T>
(MU803784)

C-58 <M/T>
(MU803782)

C-55 <A/T>
(MU803781)

NOTE
*1: ECM connector C-51 <M/T>
*2: ECM connector C-58 <M/T>
*3: PCM connector C-52 <A/T>
*4: PCM connector C-55 <A/T>

2

3 4

5 6

7 8

9

11 12 13 14 15 16 17 18 19 20

30

21 22 23

24 25

26 27 28 29

3132 33

34 35

1

10

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

Volume Airflow Sensor Circuit

3 4

1 2

A-18X

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-42

.

CIRCUIT OPERATION

• The volume airflow sensor power is supplied from

the MFI relay (terminal No. 4), and the ground is
provided on the ECM (terminal No. 34) <M/T> or
PCM (terminal No. 16) <A/T>.

• 5-volt power is applied to the volume airflow sen-

sor output terminal (terminal No. 3) from the ECM
(terminal No. 61) <M/T> or PCM (terminal No. 65)
<A/T>. The volume airflow sensor generates a
pulse signal when the output terminal and ground
are opened/closed (opened/short).

.

TECHNICAL DESCRIPTION

• While the engine is running, the volume airflow

sensor outputs a pulse signal which corresponds
to the volume of air flow.

• The ECM <M/T> or PCM <A/T> checks whether

the frequency of this signal output by the volume
airflow sensor while the engine is running is at or
above the set value.

.

DESCRIPTIONS OF MONITOR METHODS
Volume airflow sensor output voltage is out of speci-

fied range.

.

MONITOR EXECUTION
Continuous

.

MONITOR EXECUTION CONDITIONS (Other
monitor and Sensor)

Other Monitor (There is no temporary DTC stored

in memory for the item monitored below)

• Not applicable

Sensor (The sensor below is determined to be

normal)

• Not applicable

.

AK300121

MFI RELAY

CONNECTOR: A-18X

AB

A-18X

AK300053

CONNECTOR: B-14

VOLUME AIRFLOW
SENSOR

AB

B-14 (B)

AK300091

CONNECTORS: C-51, C-58 <M/T>

ECM

AB

C-51 (GR)

C-58 (GR)

AK300244

CONNECTORS: C-52, C-55 <A/T>

AB

PCM

C-52 (GR)

C-55 (GR)