Mitsubishi Montero Sport (2004+). Manual — part 157
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-41
STEP 7. Check for open circuit and harness damage
between volume airflow sensor connector A-01 (terminal
No. 7) and PCM connector C-89 (terminal No. 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 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 PCM. Then go to Step 9.
NO : The procedure 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 : Repeat the troubleshooting.
NO : The procedure is complete.
AK103913
3
4
5
1
2
6
7
CONNECTOR: A-01
A-01(B)
AB
HARNESS
CONNECTOR:
COMPONENT SIDE
AK103914
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
AB
CONNECTOR: C-89
C-89(GR)
HARNESS CONNECTOR:
COMPONENT SIDE
AK103913
3
4
5
1
2
6
7
CONNECTOR: A-01
A-01(B)
AB
HARNESS
CONNECTOR:
COMPONENT SIDE
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-42
DTC P0102: Volume Airflow Circuit Low Input
WHITE-
BL
ACK
WHITE-
BL
ACK
RED
RED
RED
BL
ACK
BL
ACK
GREEN-BL
UE
WHITE-BL
ACK
WHITE-
BL
ACK
1 2 3 4 5 6 7
1
10
2 3 4 5 6 7 8 9
11
12 13 14 15 16 17 18 19 20 21 22
23 24 25 26 27 28 29 30 31 32 33
47
41
42 43
48 49 50 51 52 53 54 55 56 57
46
45
44
58
59
60 61 62 63
64 65 66
10
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
AK301854
Volume Airflow Sensor Circuit
C-71
FUSIBLE LINK(12)
MFI RELAY
VOLUME
AIRFLOW
SENSOR
65
3
57
19
4
24
12
4
3
5
7
12
33
22
2
1
15
C-90
(MU803781)
C-89
(MU803784)
POWERTRAIN CONTROL MODULE (PCM)
A-01
C-59
5V
1
10
2 3 4 5 6 7 8 9
11
12 13 14 15 16 17 18 19 20 21 22
23 24 25 26 27 28 29 30 31 32 33
C-14
JOINT
CONNECTOR (5)
JOINT
CONNEC-
TOR (4)
1
2
3
4
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-43
.
CIRCUIT OPERATION
• The volume airflow sensor power is supplied from
the MFI relay (terminal No. 1), and the ground is
provided on the PCM (terminal No. 57).
• 5-volt power is applied to the volume airflow sen-
sor output terminal (terminal No. 3) from the PCM
(terminal No. 65). The volume airflow sensor gen-
erates 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 PCM 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
.
AK103908
CONNECTOR: A-01
VOLUME
AIRFLOW
SENSOR
A-01(B)
AE
AK201000
MFI RELAY
CONNECTOR: C-59
AB
C-59
AK103738AB
CONNECTORS: C-89, C-90
PCM
C-89(GR) C-90(GR)
AK103911AB
CONNECTOR: C-14
C-14
AK103912AB
CONNECTOR: C-71
C-71
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
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-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function
− OBD-II Drive Cycle −
Procedure 6
.
.
TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are: )
• Volume airflow sensor failed.
• Open or shorted volume airflow sensor circuit,
harness damage or connector damage.
• PCM failed.
DIAGNOSIS
Required Special Tools:
• MB991958: Scan tool (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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