Mitsubishi Montero (2004+). Manual — part 138
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-39
STEP 4. Check for short circuit to ground between volume
airflow sensor connector B-48 (terminal No. 7) and PCM
connector D-133 (terminal No. 37).
Q: Is the harness wire in good condition?
YES : Replace the volume airflow sensor. Then go to Step
NO : Repair it. Then go to Step 9.
AK200937
3
4
5
1
2
6
7
AB
HARNESS
CONNECTOR:
COMPONENT SIDE
CONNECTOR: B-48
B-48(B)
AK200939
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AB
CONNECTOR: D-133
HARNESS CONNECTOR:
COMPONENT SIDE
PCM
D-133(GR)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-40
STEP 5. Measure the reset signal voltage at volume airflow
sensor connector B-48 by backprobing.
(1) Do not disconnect the connector B-48.
(2) Start the engine and run at idle.
(3) Measure the voltage between terminal No. 7 and ground by
backprobing.
• When the engine idling, voltage should be 1.0 volt or
less.
• When the engine speed is 3,000 r/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-48 at volume airflow sensor
and connector D-133 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
. Then go to Step 9.
AK200937
3
4
5
1
2
6
7
AB
HARNESS
CONNECTOR:
COMPONENT SIDE
CONNECTOR: B-48
B-48(B)
AKX01515
6 7
1 2 3 4 5
AKX01515
AJ
B-48 HARNESS
CONNECTOR:
HARNESS SIDE
AK200937
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4
5
1
2
6
7
AB
HARNESS
CONNECTOR:
COMPONENT SIDE
CONNECTOR: B-48
B-48(B)
AK200939
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51
AB
CONNECTOR: D-133
HARNESS CONNECTOR:
COMPONENT SIDE
PCM
D-133(GR)
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 B-48 (terminal
No. 7) and PCM connector D-133 (terminal No. 37).
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 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.
AK200937
3
4
5
1
2
6
7
AB
HARNESS
CONNECTOR:
COMPONENT SIDE
CONNECTOR: B-48
B-48(B)
AK200939
31
32
33
34
35
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37
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AB
CONNECTOR: D-133
HARNESS CONNECTOR:
COMPONENT SIDE
PCM
D-133(GR)
AK200937
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4
5
1
2
6
7
AB
HARNESS
CONNECTOR:
COMPONENT SIDE
CONNECTOR: B-48
B-48(B)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-42
DTC P0102: Volume Airflow Circuit Low Input
1 2 3 4 5 6 7
3 4
1 2
RED
GREEN
WHITE-BLA
CK
SKY B
U
LE
WHITE-
BLA
CK
WHITE-
BLA
C
K
AK201126
B-48
B-22X
MFI
RELAY
BATTERY
VOLUME AIRFLOW
SENSOR
POWERTRAIN CONTROL MODULE(PCM)
5 V
37
7
88
63
4
3
2
5
3
1
4
Volume Airflow Sensor Circuit
31
35363738394041 42 43
444546474849
50 51
5253
545556
57 58
32
33 34
D-133
(MU803803)
61
656667686970 717273
74757677787980 8182
8384
858687
8889
62
6364
D-134
(MU803804)
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