Mitsubishi Montero (2004+). Manual — part 137
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-35
DTC SET CONDITIONS <Range/Performance problem
− high input>
Logic Flow Chart
Check Conditions
• Throttle position sensor output voltage is 1.5 volts
or higher.
• Engine speed is higher than 2,000 r/min.
Judgement Criteria
• Volume airflow sensor output frequency has con-
tinued to be 60 Hz or lower for 2 seconds.
.
START
Monitoring
Conditions
END
No
Yes
No
Yes
No
Yes
Malfunction
Good
Output Frequency
> = 800Hz
Continuous
Failure for 2secs
AK302693
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-36
DTC SET CONDITIONS <Range/Performance problem
− low input>
Logic Flow Chart
Check Conditions
• Throttle position sensor output voltage is 2 volts
or lower.
• Engine speed is lower than 2,000 r/min.
Judgement Criteria
• Volume airflow sensor output frequency has con-
tinued to be 800 Hz or higher 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
YES
NO
YES
NO
YES
MALFUNCTION
GOOD
OUTPUT FREQUENCY
< =60Hz
CONTINUOUS
FAILURE FOR 2 secs
AK302918
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-37
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 reset signal voltage at volume airflow
sensor connector B-48 by backprobing.
(1) Do not disconnect the connector B-48.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 7 and ground by
backprobing.
• Voltage should be between 6.0 and 9.0 volts.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage between 6.0 and 9.0 volts?
YES : Go to Step 5.
NO : Go to Step 3.
AK302970
AB
MB991911
MB991824
MB991827
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
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-38
STEP 3. 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 4.
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)
AK200939
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
52
53
54
55
56
57
58
50
51
AB
CONNECTOR: D-133
HARNESS CONNECTOR:
COMPONENT SIDE
PCM
D-133(GR)
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