Mitsubishi Eclipse. Manual - part 137

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-41

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.13A-5

.

(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.13A-5

.

(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) <2.4L>

13A-42

DTC P0102: Volume Airflow Circuit Low Input

AK300331

1 2 3 4 5 6 7

42 43
48 49 50 51 52 53 54 55 56 57

46

45

44

58 59

60 61 62 63

64 65 66

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

RED

RED

-

WHITE

RED

-

WHITE

47

1

41

10

RED

-

WHITE

GREEN-BL

UE

BROWN

WHITE-GREEN

82

78

81

80

89 90 91 92

79

87

71

74

73

72

76

75

77

85

88

83 84

86

B-14

MFI
RELAY

BATTERY

Volume Airflow Sensor Circuit

VOLUME 
AIRFLOW 
SENSOR

5 V

19 <M/T>*1
19 <A/T>*4

7

40 <M/T>*2
16 <A/T>*4

90 <M/T>*3
65 <A/T>*5

4

5

3

C-60 <M/T>
(MU803772)

C-50 <A/T>
(MU803784)

C-54 <A/T>
(MU803781)

NOTE
*1: ECM connector C-49 <M/T>
*2: ECM connector C-53 <M/T>
*3: ECM connector C-60 <M/T>
*4: PCM connector C-50 <A/T>
*5: PCM connector C-54 <A/T>

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

1

2

4

3

1

14

4

19

5

22

6

17

8

15

9

18

7

20

16

2

13

12

23 24 25 26

21

3

C-49 <M/T>
(MU803773)

10 11

C-53 <M/T>
(MU803771)

34

33

32

36

35

37

42

45

31

39

38

46

40 41

43 44

3 4

1 2

A-18X

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-43

.

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. 40) <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. 90) <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 frequency is out of 

specified 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)

AK300060

ECM

CONNECTORS: C-49, C-53, C-60 <M/T>

AM

C-53 (G) C-60 (G)

C-49 (G)

AK300060

PCM

CONNECTORS: C-50, C-54 <A/T>

AO

C-54 (GR)

C-50 (GR)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-44

DTC SET CONDITIONS

Logic Flow Chart

.

Check Conditions

• Engine speed is higher than 500 r/min.

Judgement Criteria

• Volume airflow sensor output frequency has con-

tinued to be 3.3 Hz or lower for 2 seconds.

.

OBD-ll DRIVE CYCLE PATTERN
Refer to Diagnostic Function 

− OBD-ll Drive Cycle − 

Procedure 6 

− Other Monitor 

P.13A-5

.

.

TROUBLESHOOTING HINTS (The most likely 
causes for this code to be set are: )

• Volume airflow sensor failed.

• Open or shorted volume airflow sensor circuit, or 

harness damage or connector damage.

• ECM failed. <M/T>

• PCM failed. <A/T>

• Air leak between volume airflow sensor and throt-

tle body.

DIAGNOSIS

Required Special Tools:

• MB991958 (MUT-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991911: Main Harness B

START

MONITORING

CONDITIONS

END

NO

NO

NO

YES

YES

YES

MALFUNCTION

GOOD

OUTPUT FREQUENCY

< 3.3Hz

CONTINUOUS

FAILURE FOR 2 secs

AK301413