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
(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
(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
.
.
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
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