Mitsubishi Montero Sport (2004+). Manual — part 320
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-693
.
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 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
.
AK103738AC
CONNECTOR: C-90
PCM
C-90(GR)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-694
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 has continued
to be approximately 49.5 kPa (14.6 in.Hg) or
lower (approximately 15,000 ft above sea level)
for 10 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:)
• Barometric pressure sensor failed.
• Open or shorted barometric pressure sensor cir-
cuit, harness damage or connector damage.
• PCM failed.
START
END
NO
NO
NO
YES
YES
YES
MALFUNCTION
GOOD
NO
YES
AK304167
MONITORING
CONDITIONS
BAROMETRIC PRESSURE
< 49.5kPa (14.6in.Hg)
BAROMETRIC PRESSURE
> 113kPa (33.4in.Hg)
CONTINUOUS
FAILURE FOR 10secs
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-695
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 : NO: Go to Step 2.
AK303629AB
MB991911
MB991827
MB991824
16-PIN
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-696
STEP 2. Measure the sensor output voltage at barometric
pressure 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. 2 and ground by
backprobing.
• When altitude is 0 m (0 foot), voltage should measure
between 3.7 and 4.3 volts.
• When altitude is 600 m (1,969 feet), voltage should
measure between 3.4 and 4.0 volts.
• When altitude is 1,200 m (3,937 feet), voltage should
measure between 3.2 and 3.8 volts.
• When altitude is 1,800 m (5,906 feet), voltage should
measure between 2.9 and 3.5 volts.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage within the specified range?
YES : Go to Step 3.
NO : Go to Step 7.
AK103913
3
4
5
1
2
6
7
CONNECTOR: A-01
A-01(B)
AB
HARNESS
CONNECTOR:
COMPONENT SIDE
AKX01520AJ
A-01 HARNESS
CONNECTOR:
HARNESS SIDE
1 2 3 4 5 6 7
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