Mitsubishi Eclipse. Manual — part 157
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
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MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-121
STEP 1. Using scan tool MB991958, check data list item 13:
Intake Air Temperature 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
13, Intake Air Temperature Sensor.
• The intake air temperature and temperature shown with
the scan tool should approximately match.
(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.
STEP 2. Check connector B-14 at the intake air
temperature sensor for damage.
Q: Is the connector in good condition?
YES : Go to Step 3.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 11.
AK300810
AB
MB991911
16-PIN
MB991827
MB991824
AK300078
3
4
5
1
2
6
7
CONNECTOR: B-14
AB
B-14 (B)
HARNESS
CONNECTOR:
COMPONENT SIDE
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
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MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-122
STEP 3. Check the intake air temperature sensor.
(1) Disconnect the intake air temperature sensor connector
B-14.
(2) Measure the resistance between intake air temperature
sensor side connector terminal No. 5 and No. 6.
• There should be continuity. (0.30 − 20 kΩ)
Q: Is the measured resistance between 0.30 and 20 k
Ω?
YES : Go to Step 4.
NO : Replace the volume airflow sensor. Then go to Step
11.
STEP 4. Measure the sensor supply voltage at intake air
temperature sensor harness side connector B-14.
(1) Disconnect the connector B-14 and measure at the harness
side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 6 and ground.
• Voltage should be between 4.5 and 4.9 volts.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage between 4.5 and 4.9 volts?
YES : Go to Step 8.
NO : Go to Step 5.
AK300078
3
4
5
1
2
6
7
CONNECTOR: B-14
AB
B-14 (B)
HARNESS
CONNECTOR:
COMPONENT SIDE
AK000319AB
1 2 3 4 5 6 7
INTAKE AIR TEMPERATURE
SENSOR SIDE CONNECTOR
AK300078
3
4
5
1
2
6
7
CONNECTOR: B-14
AB
B-14 (B)
HARNESS
CONNECTOR:
COMPONENT SIDE
AKX01408
7 6 5 4 3 2 1
AG
B-14 HARNESS
CONNECTOR:
COMPONENT SIDE
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
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MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-123
STEP 5. Measure the sensor supply voltage at ECM
connector C-60 <M/T> or PCM connector C-54 <A/T> by
backprobing.
(1) Do not disconnect the ECM connector C-60 <M/T> or PCM
connector C-54 <A/T>.
(2) Disconnect the intake air temperature sensor connector
B-14.
(3) Turn the ignition switch to the "ON" position.
AK300415
82
78
8180
89
90
91
92
79
87
71
74 73 72
76 75
77
85
88
83
84
86
CONNECTOR: C-60 <M/T>
AB
C-60 (G)
HARNESS CONNECTOR:
COMPONENT SIDE
AK300412
42
43
48
49
50
51
52
53
54
55
56
57
46 45 44
58
59
60
61
62
63
64
65
66
47
41
C-54 (GR)
CONNECTOR: C-54 <A/T>
AB
HARNESS CONNECTOR:
COMPONENT SIDE
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
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MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-124
(4) Measure the voltage between terminal No. 72 <M/T> or No.
64 <A/T> and ground by backprobing.
• Voltage should be between 4.5 and 4.9 volts.
(5) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage between 4.5 and 4.9 volts?
YES : Go to Step 6.
NO : Go to Step 7.
AK000285
7172 73 74 75 76 77 78 79 80 81
82 83 84 85 86 87 88 89 90
92
91
AI
<M/T>
C-60 HARNESS
CONNECTOR:
HARNESS SIDE
AK000286 AK
<A/T>
C-54 HARNESS
CONNECTOR:
HARNESS SIDE
41 42 43
44 45 46
47 48 49 50 51 52 53 54 55 56 57
58 59
60 61 62 63
64 65 66
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