Mitsubishi Montero (2004+). Manual — part 330
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-807
STEP 7. Check for open circuit and harness damage
between barometric pressure sensor connector B-48
(terminal No. 5) and PCM connector D-134 (terminal No.
88).
Q: Is the harness wire in good condition?
YES : Go to Step 8.
NO : Repair it. Then go to Step 9.
STEP 8. Replace the barometric pressure sensor.
(1) Replace the barometric pressure 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 : 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 P2227 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)
AK201166
61
62
63
64
65
66
67
68
69
70
71
76
77
78
79
85
86
87
80
72
73
74
75
81
82
83
84
88
89
CONNECTOR: D-134
AB
PCM
D-134(GR)
HARNESS CONNECTOR:
COMPONENT SIDE
AK200937
3
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-808
DTC P2228: Barometric Pressure Circuit Low Input
.
CIRCUIT OPERATION
• A 5-volt voltage is supplied to the barometric
pressure sensor power terminal (terminal No. 1)
from the PCM (terminal No. 97). The ground ter-
minal (terminal No. 5) is grounded with PCM (ter-
minal No. 88).
• A voltage that is proportional to the atmospheric
pressure is sent to the PCM (terminal No. 100)
from the barometric pressure sensor output ter-
minal (terminal No. 2).
.
AK201127
GREEN-YELLO
W
GREEN-WHITE
SKY B
U
LE
BAROMETRIC PRESSURE SENSOR
(INCORPORATED IN VOLUME AIRFLOW
SENSOR)
1
97
5 V
100
88
2
5
POWERTRAIN CONTROL MODULE (PCM)
1 2 3 4 5 6 7
B-48
Barometric Pressure Sensor Circuit
9192
939495
96979899
100
105
113114
115116117
118119120
106
107108109
110111112
101102103
104
D-135
(MU803805)
61
656667686970 717273
74757677787980 8182
8384
858687
8889
62
6364
D-134
(MU803804)
AK200940
BAROMETRIC
PRESSURE
SENSOR
AB
CONNECTOR: B-48
B-48(B)
AK201038AK
CONNECTORS: D-134, D-135
PCM
D-134(GR) D-135(GR)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-809
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 is out of
reasonable barometric pressure 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
.
DTC SET CONDITIONS
Logic Flow Chart
.
Check Conditions
• 2 seconds or more have passed since the start-
ing sequence was completed.
• Battery positive voltage is higher than 8 volts.
Judgement Criteria
• Barometric pressure sensor output signal has
continued to be approximately 49.5 kPa (14.6
in.Hg) or lower (approximately 15,000 ft above
sea level) for 10 seconds.
.
START
END
NO
NO
NO
YES
YES
YES
MALFUNCTION
GOOD
NO
YES
AK302969
MONITORING
CONDITIONS
BAROMETRIC PRESSURE
< 49.5kPa (14.6in.Hg)
BAROMETRIC PRESSURE
> 112.8kPa (33.3in.Hg)
CONTINUOUS
FAILURE FOR 10secs
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-810
OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function
− OBD-II Drive Cycle −
Procedure 6
− Other Monitor
.
.
TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are: )
• Barometric pressure sensor failed.
• Shorted barometric pressure sensor circuit, har-
ness 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
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) Turn the ignition switch to the "ON" position.
(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.
AK302970
AB
MB991911
MB991824
MB991827
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