Mitsubishi Colt Ralliart. Manual — part 751
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4G1>
13B-329
STEP 4. Connector check: B-141 ignition switch
connector
Q: Is the check result normal?
YES :
Check intermediate connectors A-17, B-112
and B-129, and repair if necessary. If
intermediate connectors are normal, check
and repair harness between B-141 (terminal
No. 2) ignition switch connector and A-123,
A-126, A-127 and A-135 (terminal No. 1)
ignition coil connectors.
• Check power supply line for
open/short circuit.
NO :
Repair or replace.
STEP 5. Perform resistance measurement at
A-123, A-126, A-127 and A-135 ignition coil
connectors.
•
Disconnect connector and measure at harness side.
• Resistance between terminal No. 2 and earth.
OK: Continuity (2
Ω or less)
Q: Is the check result normal?
YES :
Go to Step 6 .
NO :
Check and repair harness between A-123,
A-126, A-127 and A-135 (terminal No. 2)
ignition coil connectors and body earth.
• Check earthing line for open circuit
and damage.
1
2
3
4
5
6
AK402103
Connector: B-141
Harness side
connector
B-141
AC
AK402093
1
2
3
A-123(DG)
A-126(DG)
A-127(DG)
A-135(DG)
AC
Harness side connector
Connector: A-123, A-126, A-127, A-135
AK402093
1
2
3
A-123(DG)
A-126(DG)
A-127(DG)
A-135(DG)
AC
Harness side connector
Connector: A-123, A-126, A-127, A-135
Main
Index
Group
TOC
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4G1>
13B-330
STEP 6. Check harness between ignition coil
connector and engine-ECU connector.
a.
Check and repair harness between A-135 (terminal
No. 3) No. 1 ignition coil connector and A-114
(terminal No. 10) engine-ECU connector.
b. Check and repair harness between A-127 (termi-
nal No. 3) No. 2 ignition coil connector and A-114
(terminal No. 25) engine-ECU connector.
c. Check and repair harness between A-126 (termi-
nal No. 3) No. 3 ignition coil connector and A-114
(terminal No. 40) engine-ECU connector.
d. Check and repair harness between A-123 (termi-
nal No. 3) No. 4 ignition coil connector and A-114
(terminal No. 55) engine-ECU connector.
• Check signal line for open/short circuit and dam-
age.
Q: Is the check result normal?
YES :
Go to Step 7 .
NO :
Repair.
STEP 7. Check harness between B-141 (terminal
No. 2) ignition switch connector and A-123,
A-126, A-127 and A-135 (terminal No. 1) ignition
coil connector.
NOTE: Before checking harness, check intermediate
connectors A-17, B-112 and B-129, and repair if nec-
essary.
• Check power supply line for damage.
Q: Is the check result normal?
YES :
Go to Step 8 .
NO :
Repair.
STEP 8. Visual check of ignition spark.
• Remove the spark plug and install it to the ignition
coil.
• Connect the ignition coil connector.
• Remove all injector connector.
• At the engine start, check each spark plug pro-
duces a spark.
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 9 .
AK402093
1
2
3
A-123(DG)
A-126(DG)
A-127(DG)
A-135(DG)
AC
Harness side connector
Connector: A-123, A-126, A-127, A-135
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
1
2
3
4
5
6
AK402103
Connector: B-141
Harness side
connector
B-141
AC
AK402093
1
2
3
A-123(DG)
A-126(DG)
A-127(DG)
A-135(DG)
AC
Harness side connector
Connector: A-123, A-126, A-127, A-135
Main
Index
Group
TOC
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4G1>
13B-331
STEP 9. Check spark plug.
• Check spark plug (Refer to GROUP 16 − Ignition
System
− On-vehicle Service
).
Q: Is the check result normal?
YES :
Go to Step 10 .
NO :
Replace the spark plug.
STEP 10. Replace ignition coil.
• After a good ignition coil is temporarily installed,
do a test for spark at the ignition coil again.
Q: Is the check result normal?
YES :
Replace ignition coil.
NO :
Replace engine-ECU.
Inspection Procedure 27: Clutch Switch System
OPERATION
• The battery voltage is applied to the clutch switch
(terminal No. 1) from the engine-ECU (terminal
No. 44).
AK600601
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
3
2
1
6
5
4
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
Engine-ECU
Clutch switch
A-114
B-61
Clutch Switch Circuit
LG-B
LG-B
B
B
44
1
12
A-17
6
AB
Main
Index
Group
TOC
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4G1>
13B-332
FUNCTION
• Input, into the engine-ECU, the information
whether the clutch pedal is depressed or not.
When the clutch pedal is depressed to shift, the
engine-ECU takes control to close the throttle
valve and to retard the ignition timing.
PROBABLE CAUSES
• Failed clutch switch
• Open/short circuit and damage in clutch switch
circuit or loose connector contact
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. Connector check: B-61 clutch switch
connector
Q: Is the check result normal?
YES :
Go to Step 2 .
NO :
Repair or replace the connector.
STEP 2. Check the clutch switch itself.
• Clutch switch check (Refer to GROUP 21A −
Clutch
− On-vehicle Service − Clutch monitor
Switch Check and Adjustment
).
Q: Is the check result normal?
YES :
Go to Step 6 .
NO :
Replace the clutch switch.
STEP 3. Perform voltage measurement at B-61
clutch switch connector.
• Disconnect connector, and measure at the har-
ness side.
• Ignition switch: ON
• Voltage between terminal No. 1 and earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 6 .
NO :
Go to Step 4 .
STEP 4. Connector check: A-114 engine-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 5 .
NO :
Repair or replace the connector.
AK600405
1
2
3
4
5
6
B-61 (L)
Connector: B-61
B-61 Harness side
connector
AG
AK600405
1
2
3
4
5
6
B-61 (L)
Connector: B-61
B-61 Harness side
connector
AG
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
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