Mitsubishi Galant 9G. Manual — part 666
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-106
STEP 6. Check harness connector B-02 at the manifold
absolute pressure sensor and harness connector B-22 at
PCM for damage.
Q: Is the harness connector in good condition?
YES : Replace the manifold absolute pressure sensor. Then
go to Step 7.
NO : Repair or replace it. Refer to GROUP 00E, Harness
. Then go to Step 7.
STEP 7. 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 P0108 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.
AK303809
1
2
3
AB
CONNECTOR: B-02
B-02 (B)
HARNESS CONNECTOR:
COMPONENT SIDE
AK303016
104
96
94
95
93 92 91
99 98 97
103 102 101 100
108 107 106 105
113 112 111 110 109
CONNECTOR: B-22
B-22 (B)
PCM
AB
HARNESS CONNECTOR:
COMPONENT SIDE
AIR CLEANER
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-107
DTC P0111: Intake Air Temperature Circuit Range/Performance Problem
CAUTION
If DTC P0111 has been set, TCL related DTC
U1120 is also set. After P0111 has been diag-
nosed, don't forget to erase DTC U1120.
.
100
99
92
91
93 94 95
96 97 98
101 102 103 104
105 106 107 108
109 110 111 112 113
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
1
2
3 4
AK303812
BLA
C
K
RED-BLUE
INTAKE AIR TEMPERATURE SENSOR
(INTEGRATED IN MASS AIRFLOW
SENSOR)
POWERTRAIN CONTROL MODULE (PCM)
5 V
107
4
69
1
B-10
Intake Air Temperature Sensor Circuit
B-21
B-22
AK303802AB
CONNECTOR: B-10
MASS AIRFLOW SENSOR
(WITH BUILT-IN INTAKE AIR
TEMPERATURE SENSOR)
B-10 (GR)
AK303013
CONNECTORS: B-21, B-22
PCM
AB
AIR CLEANER
B-22 (B)
B-21 (B)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-108
CIRCUIT OPERATION
• Approximately 5 volts are applied to the intake air
temperature sensor output terminal (terminal No.
1) from the PCM (terminal No. 107) via the resis-
tor in the PCM. The ground terminal (terminal No.
4) is grounded with PCM (terminal No. 69).
• The intake air temperature sensor is a negative
temperature coefficient type of resistor. When the
intake air temperature rises, the resistance
decreases.
• The intake air temperature sensor output voltage
increases when the resistance increases and
decreases when the resistance decreases.
.
TECHNICAL DESCRIPTION
• The intake air temperature sensor converts the
intake air temperature to a voltage.
• The PCM checks whether this voltage is within a
specified range.
.
DESCRIPTIONS OF MONITOR METHODS
Intake air temperature sensor output voltage does
not change when specified go/stop operations
are repeated.
.
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
.
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-109
DTC SET CONDITIONS
Logic Flow Chart
.
Check Conditions
• Engine coolant temperature is higher than 76°C
(169
°F).
• Repeat 2 or more times: drive
*1
, stop
*2
.
Drive
*1
: vehicle speed higher than 50 km/h (31
mph) lasting a total of more than 60 seconds.
Stop
*2
: vehicle speed lower than 1.5 km/h (1.0
mph) lasting more than 30 seconds.
Judgement Criteria
• Changes in the intake air temperature is lower
than 1
°C (34°F).
.
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:)
• Intake air temperature sensor failed.
• Open intake air temperature sensor circuit, har-
ness damage or connector damage.
• PCM failed.
END
MALFUNCTION
YES
YES
NO
NO
YES
NO
GO/STOP OPERATION
FOR SPECIFIED TIMES
INTAKE AIR TEMP.
CHANGES
MONITORING
CONDITIONS
GOOD
START
AK302012
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