Mitsubishi Montero Sport (2004+). Manual — part 318
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-685
.
CIRCUIT OPERATION
• A 5-volt voltage is supplied to the barometric
pressure sensor power terminal (terminal No. 1)
from the PCM (terminal No. 46). The ground ter-
minal (terminal No. 5) is grounded with PCM (ter-
minal No. 57).
• A voltage that is proportional to the atmospheric
pressure is sent to the PCM (terminal No. 55)
from the barometric pressure sensor output ter-
minal (terminal No. 2).
.
TECHNICAL DESCRIPTION
• The barometric pressure sensor outputs a volt-
age which corresponds to the barometric pres-
sure.
• The PCM checks whether this voltage is within a
specified range.
.
DESCRIPTIONS OF MONITOR METHODS
Barometric pressure sensor output voltage does not
change for specified period. (approximately 1
week)
.
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
.
AK103912AB
CONNECTOR: C-71
C-71
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-686
DTC SET CONDITIONS
Logic Flow Chart
.
Check Conditions
• Barometric pressure is lower than 76 kPa (22.4
in.Hg).
Judgement Criteria
• During 15 times of driving, the changes in the
sensor output voltage should measure 0.015 volt
[equivalent to 0.4 kPa (0.12 in.Hg)] or less.
• Make sure that the engine coolant temperature is
72
°C (162°F) or higher during each of the 15
times of driving. Also, during each of the 15 times
of driving, make sure that after the engine has
been started, the engine coolant temperature has
increased for 23
°C (73°F) or higher.
.
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:)
• Barometric pressure sensor failed.
• Harness damage in barometric pressure sensor
circuit, or connector damage.
• PCM failed.
START
MONITORING
CONDITIONS
CIRCUIT VOLTAGE
MALFUNCTION
CONTINUOUS
FAILURE FOR 2secs
NO
YES
YES
NO
< 6V
END
GOOD
NO
Yes
AK301455
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-687
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: V.C.I
• MB991827: USB Cable
• MB991911: Main Harness B
STEP 1. Using scan tool MB991958, check data list item 25:
Barometric Pressure 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
25, Barometric Pressure Sensor.
• When altitude is 0 m (0 foot), 101 kPa (29.8 in.Hg).
• When altitude is 600 m (1,969 feet), 95 kPa (28.1 in.Hg).
• When altitude is 1,200 m (3,937 feet), 88 kPa (26.0
in.Hg).
• When altitude is 1,800 m (5,906 feet), 81 kPa (23.9
in.Hg).
(4) 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. Replace the airflow sensor.
(1) Replace the 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 P2227 set?
YES : Go to Step 3.
NO : The procedure is complete.
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
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-688
STEP 3. Check connector A-01 at the barometric pressure
sensor and connector C-90 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 7.
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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