Mitsubishi Galant 9G. Manual — part 657
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-70
STEP 5. Check for open circuit between mass airflow
sensor connector B-10 (terminal No. 4) and PCM connector
B-21 (terminal No. 69).
Q: Is the harness wire in good condition?
YES : Go to Step 6.
NO : Repair it. Then go to Step 8.
AK303805
2
1
3
4
AB
CONNECTOR: B-10
B-10 (GR)
HARNESS CONNECTOR:
COMPONENT SIDE
AK303018
55
56
54 53 52 51
57
62 61 60 59 58
63
69 68 67 66 65 64
70
75 74 73 72 71
76
82 81 80 79 78 77
83
CONNECTOR: B-21
PCM
AB
HARNESS CONNECTOR:
COMPONENT SIDE
AIR CLEANER
B-21 (B)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-71
STEP 6. Using scan tool MB991958, check data list item 12:
Mass 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, Mass 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 between 2.0
and 6.0 g/sec.
• When the engine is revved, the mass airflow rate 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
− How to
Cope with Intermittent Malfunctions
NO : Replace the PCM. Then go to Step 8.
STEP 7. Check harness connector B-21 at PCM for
damage.
Q: Is the harness connector in good condition?
YES : Replace the mass airflow sensor. Then go to Step 8.
NO : Repair or replace it. Refer to GROUP 00E, Harness
. Then go to Step 8.
AK303804AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
AK303018
55
56
54 53 52 51
57
62 61 60 59 58
63
69 68 67 66 65 64
70
75 74 73 72 71
76
82 81 80 79 78 77
83
CONNECTOR: B-21
PCM
AB
HARNESS CONNECTOR:
COMPONENT SIDE
AIR CLEANER
B-21 (B)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-72
STEP 8. 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 −
(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0103 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.
DTC P0106: Manifold Absolute Pressure Circuit Range/Performance Problem
1
2
3
52
51
53 54 55 56
57
58 59 60 61 62
63
64 65 66 67 68 69
70
71 72 73 74 75
76
77 78 79 80 81 82
83
100
99
92
91
93 94 95
96 97 98
101 102 103 104
105 106 107 108
109 110 111 112 113
AK400877
GREEN-YELLO
W
BLUE-RED
BLA
CK
POWERTRAIN CONTROL
MODULE (PCM)
MANIFOLD ABSOLUTE
PRESSURE SENSOR
3
1
2
Manifold Absolute Pressure Sensor Circuit
68
69
102
B-21
B-22
B-02
(MU802723)
5 V
AK303808AB
CONNECTOR: B-02
MANIFOLD
ABSOLUTE
PRESSURE
SENSOR
B-02 (B)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-73
.
CIRCUIT OPERATION
• A 5-volt voltage is supplied to the manifold abso-
lute pressure sensor power terminal (terminal No.
3) from the PCM (terminal No. 68). The ground
terminal (terminal No. 2) is grounded with PCM
(terminal No. 69).
• A voltage that is proportional to the intake mani-
fold pressure is sent to the PCM (terminal No.
102) from the manifold absolute pressure sensor
output terminal (terminal No. 1).
.
TECHNICAL DESCRIPTION
• The manifold absolute pressure sensor outputs a
voltage which corresponds to the intake manifold
pressure.
• The PCM checks whether this voltage is within a
specified range.
.
DESCRIPTIONS OF MONITOR METHODS
Compare load value with manifold absolute pressure
sensor output voltage.
.
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)
• Engine coolant temperature sensor
• Throttle position sensor
• Mass airflow sensor
• Intake air temperature sensor
• Barometric pressure sensor
.
AK303013
CONNECTORS: B-21, B-22
PCM
AB
AIR CLEANER
B-22 (B)
B-21 (B)
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