Mitsubishi Montero Sport (2004+). Manual — part 158
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-45
STEP 1. Using scan tool MB991958, check data list item 12:
Volume Airflow Sensor.
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958 to the data link connector.
(2) Start the engine and run at idle.
(3) Set scan tool MB991958 to the data reading mode for item
12, Volume Airflow Sensor.
(4) Warm up the engine to normal operating temperature: 80
°C
to 95
°C (176°F to 203°F).
• The standard value during idling should be 10 Hz or
more.
• When the engine is revved, the frequency should
increase according to the increase in engine speed.
(5) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the sensor operating properly?
YES : It can be assumed that this malfunction is intermittent.
Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points
NO : Go to Step 2.
STEP 2. Measure the power supply voltage at volume
airflow sensor connector A-01 by backprobing.
(1) Do not disconnect the connector A-01.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 4 and ground by
backprobing.
• Voltage should be battery positive voltage.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is battery positive voltage (approximately 12 volts)
present?
YES : Go to Step 5.
NO : Go to Step 3.
AK303629AB
MB991911
MB991827
MB991824
16-PIN
AK103913
3
4
5
1
2
6
7
CONNECTOR: A-01
A-01(B)
AB
HARNESS
CONNECTOR:
COMPONENT SIDE
AKX01514 AO
A-01 HARNESS
CONNECTOR:
HARNESS SIDE
1 2 3 4 5 6 7
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-46
STEP 3. Measure the power supply voltage at volume
airflow sensor harness side connector A-01.
(1) Disconnect the connector A-01 and measure at the harness
side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 4 and ground.
• Voltage should be battery positive voltage.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is battery positive voltage (approximately 12 volts)
present?
YES : Go to Step 4.
NO : Check connector C-14 at intermediate connector for
damage, and repair or replace as required. Refer to
GROUP 00E, Harness Connector Inspection
. If intermediate connector is in good
condition, repair harness wire between MFI relay
connector C-59 (terminal No. 1) and volume airflow
sensor connector A-01 (terminal No. 4) because of
open circuit or short circuit to ground. Then go to Step
13.
STEP 4. Check connector A-01 at the volume airflow
sensor for damage.
Q: Is the connector in good condition?
YES : Check connector C-14 at intermediate connector for
damage, and repair or replace as required. Refer to
GROUP 00E, Harness Connector Inspection
. If intermediate connector is in good
condition, repair harness wire between MFI relay
connector C-59 (terminal No. 1) and volume airflow
sensor connector A-01 (terminal No. 4) because of
harness damage. Then go to Step 13.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 13.
AK103913
3
4
5
1
2
6
7
CONNECTOR: A-01
A-01(B)
AB
HARNESS
CONNECTOR:
COMPONENT SIDE
AKX01405
A-01 HARNESS CONNECTOR:
COMPONENT SIDE
7 6 5 4 3 2 1
AM
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-47
STEP 5. Check connector A-01 at volume airflow sensor
for damage.
Q: Is the connector in good condition?
YES : Go to Step 6.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 13.
STEP 6. Measure the sensor supply voltage at volume
airflow sensor harness side connector A-01.
(1) Disconnect the connector A-01 and measure at the harness
side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 3 and ground.
• Voltage should be between 4.8 and 5.2 volts.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage between 4.8 and 5.2 volts?
YES : Go to Step 9.
NO : Go to Step 7.
STEP 7. Check connector C-90 at PCM for damage.
Q: Is the harness connector in good condition?
YES : Go to Step 8.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 13.
AK103913
3
4
5
1
2
6
7
CONNECTOR: A-01
A-01(B)
AB
HARNESS
CONNECTOR:
COMPONENT SIDE
AK103913
3
4
5
1
2
6
7
CONNECTOR: A-01
A-01(B)
AB
HARNESS
CONNECTOR:
COMPONENT SIDE
AKX01406 AK
A-01 HARNESS CONNECTOR:
COMPONENT SIDE
7 6 5 4 3 2 1
AK103762
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
AB
CONNECTOR: C-90
C-90(GR)
HARNESS CONNECTOR:
COMPONENT SIDE
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-48
STEP 8. Check for short circuit to ground between volume
airflow sensor connector A-01 (terminal No. 3) and PCM
connector C-90 (terminal No. 65).
Q: Is the harness wire in good condition?
YES : Replace the PCM. Then go to Step 13.
NO : Repair it. Then go to Step 13.
STEP 9. Check for continuity at volume airflow sensor
harness side connector A-01.
NOTE: Check harness after checking intermediate connector
C-71. If intermediate connector is damaged, repair or replace it.
Refer to GROUP 00E, Harness Connector Inspection
Then go to Step 13.
AK103913
3
4
5
1
2
6
7
CONNECTOR: A-01
A-01(B)
AB
HARNESS
CONNECTOR:
COMPONENT SIDE
AK103762
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
AB
CONNECTOR: C-90
C-90(GR)
HARNESS CONNECTOR:
COMPONENT SIDE
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