Mitsubishi Colt Ralliart. Manual — part 42
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4A9>
13A-122
STEP 4. Connector check: B-106 engine control
relay connector and A-114 engine-ECU
connector or engine-CVT-ECU connector
Q: Is the check result normal?
YES :
Go to Step 5 .
NO :
Repair or replace the connector.
STEP 5.Check harness between B-106 (terminal
No. 4) engine control relay connector and A-103
(terminal No. 1) No. 2 injector connector.
NOTE: Before checking harness, check intermediate
connector 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 6 .
NO :
Repair the damaged harness wire.
3
2
1
4
AK402060
B-106
J/B side
connector
B-106
Connector: B-106
J/B (front side)
AC
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
AD
A-114
Connector:
A-114
Harness side connector
Engine-ECU <M/T> or
engine-CVT-ECU <CVT>
Battery
3
2
1
4
AK402060
B-106
J/B side
connector
B-106
Connector: B-106
J/B (front side)
AC
AK402148
M
1
2
A-103 (G)
Connector: A-103
AC
A-103 Harness side
connector
Main
Index
Group
TOC
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4A9>
13A-123
STEP 6. Check harness between A-103 (terminal
No. 2) No. 2 injector connector and A-114
(terminal No. 9) engine-ECU connector or
engine-CVT-ECU connector.
• Check earthing line for damage.
Q: Is the check result normal?
YES :
Go to Step 7 .
NO :
Repair the damaged harness wire.
STEP 7. Fuel pressure measurement.
• Fuel pressure measurement (Refer to Fuel Pres-
sure Test
Q: Is the check result normal?
YES :
Go to Step 8 .
NO :
Repair the fuel pressure.
STEP 8. M.U.T.-III diagnosis code.
• Reconfirmation of diagnosis code.
Q: Is the diagnosis code set?
YES :
Replace the engine-ECU <M/T> or
engine-CVT-ECU <CVT>.
NO :
Intermittent malfunction (Refer to GROUP
00
− How to Use Troubleshooting/Inspection
Service Points
− How to Cope with
Intermittent Malfunctions
).
AK402148
M
1
2
A-103 (G)
Connector: A-103
AC
A-103 Harness side
connector
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
AD
A-114
Connector:
A-114
Harness side connector
Engine-ECU <M/T> or
engine-CVT-ECU <CVT>
Battery
Main
Index
Group
TOC
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4A9>
13A-124
Code No. P0303: No. 3 Cylinder Misfire Detected
OPERATION
• Refer to Code No. P0203 No. 3 Injector System
FUNCTION
• If a misfire occurs while the engine is running, the
engine speed changes for an instant.
• The engine-ECU <M/T> or engine-CVT-ECU
<CVT> checks for such changes in engine
speed.
TROUBLE JUDGMENT
Check Conditions
• Engine speed is 500 − 4,500 r/min.
• Engine coolant temperature is −10°C or higher.
• The intake manifold pressure is above 30 kPa
<M/T>.
• Barometric pressure is 76 kPa or higher <CVT>.
• Volumetric efficiency is between 30 % and 55 %
<CVT>.
• Adaptive learning is complete for the vane which
generates a crankshaft position signal.
• While the engine is running, excluding gear shift-
ing, deceleration, sudden acceleration/decelera-
tion and A/C compressor switching.
• The throttle deviation is −0.06 V/10 ms to +0.06
V/10 ms.
Judgment Criteria (change in the angular accel-
eration of the crankshaft is used for misfire
detection).
• Misfire has occurred more frequently than the
limit during the last 200 revolutions (when the cat-
alyst temperature has been 950
°C or higher).
or
• Misfire has occurred 15 times or more in the last
1,000 revolutions (that has been equivalent to
approximately 1.5 times the emission standard).
PROBABLE CAUSES
• Ignition system related part(s) failed
• Low compression pressure
• Failed engine-ECU <M/T> or engine-CVT-ECU
<CVT>
DIAGNOSIS PROCEDURE
STEP 1. 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 :
Go to Step 2 .
NO :
Check ignition circuit system (Refer to
Inspection Procedure 28
STEP 2. Connector check: A-104 No. 3 injector
connector
Q: Is the check result normal?
YES :
Go to Step 3 .
NO :
Repair or replace the connector.
STEP 3. Check No. 3 injector itself.
• Check Injector itself (Refer to
).
Q: Is the check result normal?
YES :
Go to Step 4 .
NO :
Replace the No. 3 injector.
AK402149
M
1
2
A-104 (G)
Connector: A-104
AC
A-104 Harness side
connector
Main
Index
Group
TOC
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4A9>
13A-125
STEP 4. Connector check: B-106 engine control
relay connector and A-114 engine-ECU
connector or engine-CVT-ECU connector
Q: Is the check result normal?
YES :
Go to Step 5 .
NO :
Repair or replace the connector.
STEP 5.Check harness between B-106 (terminal
No. 4) engine control relay connector and A-104
(terminal No. 1) No. 3 injector connector.
NOTE: Before checking harness, check intermediate
connector 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 6 .
NO :
Repair the damaged harness wire.
3
2
1
4
AK402060
B-106
J/B side
connector
B-106
Connector: B-106
J/B (front side)
AC
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
AD
A-114
Connector:
A-114
Harness side connector
Engine-ECU <M/T> or
engine-CVT-ECU <CVT>
Battery
3
2
1
4
AK402060
B-106
J/B side
connector
B-106
Connector: B-106
J/B (front side)
AC
AK402149
M
1
2
A-104 (G)
Connector: A-104
AC
A-104 Harness side
connector
Main
Index
Group
TOC
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