Mitsubishi Colt Ralliart. Manual — part 676
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4G1>
13B-29
STEP 8. Connector check: A-114 engine-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 9 .
NO :
Repair or replace.
STEP 9. Check harness between A-136 (terminal
No. 2) fuel pressure solenoid valve connector
and A-114 (terminal No. 57) engine-ECU
connector.
• Check output line for damage.
Q: Is the check result normal?
YES :
Go to Step 10 .
NO :
Repair.
AK402745
6
4
2
5
3
1
9
7
8
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
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
L
AF
A-114
Connector:
A-114
Harness side connector
Engine-ECU
Battery
AK402120
1
2
AC
Connector: A-136
Harness side
connector
A-136(B)
AK402745
6
4
2
5
3
1
9
7
8
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
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
L
AF
A-114
Connector:
A-114
Harness side connector
Engine-ECU
Battery
Main
Index
Group
TOC
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4G1>
13B-30
STEP 10. Check harness between A-136 (terminal
No. 1) fuel pressure control solenoid valve
connector and B-106 (terminal No. 4) engine
control relay connector.
NOTE: Before checking harness, check intermediate
connectors A-17 and B-112, and repair if necessary.
• Check power supply line for damage.
Q: Is the check result normal?
YES :
Go to Step 11 .
NO :
Repair.
STEP 11. M.U.T.-III actuator test
• Item 09: Fuel pressure solenoid valve
OK: Operating sound can be heard and the
valve vibrates.
Q: Is the check result normal?
YES :
Intermittent malfunction (Refer to GROUP
00
− How to Use Troubleshooting/Inspection
Service Points
− How to Cope with
Intermittent Malfunctions
).
NO :
Replace engine-ECU.
AK402120
1
2
AC
Connector: A-136
Harness side
connector
A-136(B)
3
2
1
4
AK402084
J/B side
connector
B-106
Connector: B-106
J/B (front side)
AC
Main
Index
Group
TOC
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4G1>
13B-31
Code No. P0100: Air Flow Sensor System
AK402713
3
1
2
4
1
2
3 4
R
92 93 94 95969798
77 78 79 808182838485868788899091
99
100
107 108 109 110 111112113114115116117118119120121
122 123 124 125126127128129130131132133134135136
101102103104105106
71 72
73 74
75 76
Y-L
Air flow sensor
Engine-ECU
90
3
102
2
4
A-34
AE
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 P: Purple
Air Flow Sensor Circuit
J/B
Engine
control
relay
4
2
3
1
6
To engine-ECU
R
B-106
B-112
1
1
R
Fusible link
16
20A
B-108
B
A-08
5 V
Main
Index
Group
TOC
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4G1>
13B-32
OPERATION
• Power is supplied to the air flow sensor (terminal
No. 2) through engine control relay (terminal No.
4), and the air flow sensor (terminal No. 4) is
earthed to the engine-ECU (terminal No. 102).
• The sensor output signal is input to the
engine-ECU (terminal No. 90) from the air flow
sensor output terminal (terminal No. 3).
FUNCTION
• The air flow sensor outputs a current correspond-
ing to the intake of air.
• In response to the air flow sensor output and
engine speed signal, the engine-ECU determines
the basic injection time for the injectors.
TROUBLE JUDGEMENT
Check Condition
• 3 seconds later from when ignition switch is in
ON position.
• While engine running
Judgement Criterion
• Sensor output voltage is less than 0.2 V for 4 sec-
onds.
Or
• Sensor output voltage is more than 4.9 V for 4
seconds.
PROBABLE CAUSES
• Failed air flow sensor
• Open/short circuit in air flow sensor circuit or
loose connector contact
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III data list
• Refer to Data List Reference Table
.
a. Item 12: air flow sensor
Q: Is the check result normal?
YES :
Intermittent malfunction (Refer to GROUP
00
− How to Use
Troubleshooting/Inspection Service Points
−
How to Cope with Intermittent Malfunctions
).
NO :
Go to Step 2 .
STEP 2. Connector check: A-34 air flow sensor
connector
Q: Is the check result normal?
YES :
Go to Step 3 .
NO :
Repair or replace.
STEP 3. Perform voltage measurement at A-34 air
flow sensor connector.
• Disconnect connector, and measure at harness
side.
• Ignition switch: ON
• Voltage between terminal No. 2 and earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go the Step 5 .
NO :
Go the Step 4 .
AK402083
2
1
3
4
Connector: A-34
Harness side
connector
A-34 (GR)
AC
AK402083
2
1
3
4
Connector: A-34
Harness side
connector
A-34 (GR)
AC
Main
Index
Group
TOC
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст