Mitsubishi Eclipse. Manual — part 387
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-91
DTC SET CONDITIONS
Logic Flow Chart
.
Check Conditions
• 8 minutes or more have passed since the starting
sequence was completed, when the engine cool-
ant temperature at engine start is 0
°C (32°F) or
lower.
Judgement Criteria
• Manifold absolute pressure is 117 kPa (34.6
in.Hg) or higher for 2 seconds.
.
OBD-ll DRIVE CYCLE PATTERN
Refer to Diagnostic Function
− OBD-ll Drive Cycle −
Procedure 6
.
.
TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are: )
• Manifold Absolute pressure sensor failed.
• Open manifold absolute pressure sensor circuit,
or connector damage.
• ECM <M/T> failed.
• PCM <M/T> failed.
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (MUT-III Sub Assembly)
YES
YES
YES
YES
NO
NO
NO
NO
MONITORING
CONDITIONS
PRESSURE < 4.9kPa (1.4in.Hg)
PRESSURE > 117kPa (34.6in.Hg)
CONTINUOUS
FAILURE FOR 2secs
MALFUNCTION
END
GOOD
START
AK301416
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-92
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991911: Main Harness B
STEP 1. Using scan tool MB991958, check data list item 95:
Manifold Absolute 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
95, Manifold Absolute 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) Start the engine.
• When the engine is idling, 18 − 38 kPa (5.3 − 11.2
in.Hg).
• When the engine is suddenly revved, manifold absolute
pressure increases.
(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.
AK300810
AB
MB991911
16-PIN
MB991827
MB991824
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-93
STEP 2. Measure the sensor output voltage at manifold
absolute pressure sensor connector B-04 by backprobing.
(1) Do not disconnect the connector B-04.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 1 and ground by
backprobing.
• When altitude is 0 m (0 foot), voltage should be 3.7 and
4.3 volts.
• When altitude is 600 m (1,969 feet), voltage should be
3.4 and 4.0 volts.
• When altitude is 1,200 m (3,937 feet), voltage should be
3.2 and 3.8 volts.
• When altitude is 1,800 m (5,906 feet), voltage should be
2.9 and 3.5 volts.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the voltage normal?
YES : Go to Step 3.
NO : Go to Step 5.
AK103763
2 1
3
CONNECTOR: B-04
AC
B-04(B)
HARNESS CONNECTOR:
COMPONENT SIDE
3
2
1
AK203034
B-04 HARNESS
CONNECTOR:
HARNESS SIDE
AE
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-94
STEP 3. Check connector B-04 at the manifold absolute
pressure sensor and connector C-62 at ECM <M/T> or C-59
at PCM <A/T> 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 12.
AK103763
2 1
3
CONNECTOR: B-04
AC
B-04(B)
HARNESS CONNECTOR:
COMPONENT SIDE
AK300460
98
78
71
88
89
76
77
72
79
91
73
80
74
75
81
92
82
83
93
84
85
94
86
87
95
96
90
97
CONNECTOR: C-59 <A/T>
C-59 (GR)
AB
HARNESS CONNECTOR:
COMPONENT SIDE
AK300445
80
87
81
94
85
82
84
93
86
98
99
74
92
73
83
88
91
95
97 96
100
89
78
71
90
76
77
75
72
79
CONNECTOR: C-62 <M/T>
C-62 (GR)
AB
HARNESS CONNECTOR:
COMPONENT SIDE
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