Mitsubishi Lancer Evolution IX. Manual — part 392
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-43
STEP 18. Check harness between B-105 (terminal
No. 2) air flow sensor connector and C-119
(terminal No. 51) engine-ECU connector.
• Check output line for short circuit and damage.
Q: Is the check result normal?
YES :
Replace the air flow sensor.
NO :
Repair the damaged harness wire.
STEP 19. Perform voltage measurement at C-119
engine-ECU connector.
• Measure engine-ECU terminal voltage.
• Ignition switch: "ON"
• Voltage between terminal No. 51 and earth.
OK:
Altitude 0 m: 3.8
− 4.2 V
Altitude 600 m: 3.5
− 3.9 V
Altitude 1,200 m: 3.3
− 3.7 V
Altitude 1,800 m: 3.0
− 3.4 V
Q: Is the check result normal?
YES :
Go to Step 21 .
NO :
Go to Step 20 .
AK305005
3
4
5
1
2
6
7
AB
Connector : B-105
Harness side
connector
B-105(B)
AK501994
65
43
50
42
49
41
48
60
61
64
46
47
58
59
67
68
45
56
66
52 51
44
53
62
54
63
57
55
AB
Connector: C-119
C-119 (GR)
C-119 (GR)
Harness side connector
<L. H. drive vehicles>
<R. H. drive vehicles>
AK501994
65
43
50
42
49
41
48
60
61
64
46
47
58
59
67
68
45
56
66
52 51
44
53
62
54
63
57
55
AB
Connector: C-119
C-119 (GR)
C-119 (GR)
Harness side connector
<L. H. drive vehicles>
<R. H. drive vehicles>
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-44
STEP 20. Connector check: C-119 engine-ECU
connector
Q: Is the check result normal?
YES :
Check and repair harness between B-105
(terminal No. 2) air flow sensor connector
and C-119 (terminal No. 51) engine-ECU
connector.
• Check output line for open circuit and
damage.
NO :
Repair or replace the connector.
STEP 21. Connector check: C-119 engine-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 8 .
NO :
Repair or replace the connector.
AK501994
65
43
50
42
49
41
48
60
61
64
46
47
58
59
67
68
45
56
66
52 51
44
53
62
54
63
57
55
AB
Connector: C-119
C-119 (GR)
C-119 (GR)
Harness side connector
<L. H. drive vehicles>
<R. H. drive vehicles>
AK305005
3
4
5
1
2
6
7
AB
Connector : B-105
Harness side
connector
B-105(B)
AK501994
65
43
50
42
49
41
48
60
61
64
46
47
58
59
67
68
45
56
66
52 51
44
53
62
54
63
57
55
AB
Connector: C-119
C-119 (GR)
C-119 (GR)
Harness side connector
<L. H. drive vehicles>
<R. H. drive vehicles>
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-45
Code No. P0110: Intake Air Temperature Sensor System
OPERATION
• A power voltage of 5 V is applied to the intake air
temperature sensor output terminal (terminal No.
6) of the air flow sensor connector from the
engine-ECU (terminal No. 62)
• The power voltage is earthed to the engine-ECU
(terminal No. 34) from the air flow sensor (termi-
nal No. 5).
FUNCTION
• The intake air temperature sensor converts the
intake air temperature into a voltage and inputs
the voltage signal to the engine-ECU.
• In response to the signal, the engine-ECU cor-
rects the fuel injection amount, etc.
• The intake air temperature sensor is a kind of
resistor, which has characteristics to reduce its
resistance as the intake air temperature rises.
Therefore, the sensor output voltage varies with
the intake air temperature, and becomes lower as
the intake air temperature rises.
TROUBLE JUDGMENT
Check Condition
• 2 seconds later after the ignition switch has been
in "ON" position or the engine has started up.
Judgment Criterion
• The sensor output voltage of 4.6 V or more
(intake air temperature below
−45°C or equiva-
lent) for 2 seconds.
or
• The sensor output voltage of 0.2 V or loss (intake
air temperature above 125
°C or equivalent) for 2
seconds.
2 3
7
4 5 6
1
AK501802
65
43
50
42
49
41
48
60 61
64
46 47
58 59
67 68
45
56
66
52
51
44
53
62
54
63
57
55
2
3 4
5 6
7 8
9
11 12 13 14 15 16 17 18 19 20
30
21 22 23
24 25
26 27 28 29
3132 33
34 35
1
10
34
62
Engine-ECU
5
6
Intake air temperature sensor circuit
R-L
Wire colour code
B: Black LG: Light green G: Green L: Blue W: White Y: Yellow SB: Sky blue BR: Brown O: Orange GR: Gray
R: Red P: Pink V: Violet PU: Purple
Intake air temperature sensor
(Incorporated in air flow sensor)
5 V
B
B-105
(MU802552)
C-119
(MU803782)
AB
C-121
(MU803783)
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-46
PROBABLE CAUSES
• Failed intake air temperature sensor
• Open/short circuit in intake air temperature sen-
sor circuit or loose connector contact
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-II/III data list
• Item No. 13: Intake air temperature sensor
OK: At ambient temperature or equivalent.
Q: Is the check result normal?
YES :
Intermittent malfunction (Refer to GROUP
00
− How to Use
Troubleshooting/Inspection Service Points
).
NO :
Go to Step 2 .
STEP 2. Connector check: B-105 air flow sensor
connector
Q: Is the check result normal?
YES :
Go to Step 3 .
NO :
Repair or replace the connector.
STEP 3. Check intake air temperature sensor
itself.
• Check intake air temperature sensor itself (Refer
to
).
Q: Is the check result normal?
YES :
Go to Step 4 .
NO :
Replace the air flow sensor.
STEP 4. Perform resistance measurement at
B-105 air flow sensor connector.
• Disconnect connector, and measure at harness
side.
• Resistance between terminal No. 5 and earth.
OK: 2
Ω or less
Q: Is the check result normal?
YES :
Go to Step 8 .
NO :
Go to Step 5 .
STEP 5. Connector check: C-121 engine-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 6 .
NO :
Repair or replace the connector.
AK305005
3
4
5
1
2
6
7
AB
Connector : B-105
Harness side
connector
B-105(B)
AK305005
3
4
5
1
2
6
7
AB
Connector : B-105
Harness side
connector
B-105(B)
AK501995
2
3
4
5
6
7
8
9
11
12
13
14
15
16
17
18
19
20
30
21
22
23
24
25
26
27
28
29
31
32
33
34
35
1
10
AB
Connector: C-121
C-121 (GR)
C-121 (GR)
Harness side connector
<L. H. drive vehicles>
<R. H. drive vehicles>
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст