Mitsubishi Eclipse. Manual — part 346
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-877
INSPECTION PROCEDURE 33: Ignition Circuit System
AK103265
3
1 2
1 2
1
3
4 5 6
1
GREEN
3
2
4 5 6
7
2
6
3
5
1
4
BLACK-
WHITE
3
8
2
BLA
CK-BLUE
BLA
CK
WHITE-
GREEN
BLA
CK
BLA
CK-
WHITE
BLA
CK-
WHITE
BLA
CK-
WHITE
BLACK-WHITE
BLA
CK-WHITE
LOCK
ACC
IG1
IGNITION
SWITCH
C-87
2
6
10
15
C-89
R
C-111
MU801331
IG2
IGNITION
COIL 1
IGNITION
COIL 2
B-16
(MU802053)
B-21
(MU802053)
4
C-07
MU801333
JUNCTION
BLOCK
ST
2
2
1
1
3
3
SPARK PLUG
Ignition Circuit
15 16
26 27 28 29
32 33 34
17 18 19 20 21 22 23 24 25
30 31
36 37
35
38
10
11 12 13
1 2 3
4 5 6 7 8 9
14
1
6
4 5
11
10
1213
15
17
16
14
19
18
8 9
7
20
2 3
2122 23 2425 26 27 28
C-108
C-54 <A/T>
(MU803781)
C-50 <A/T>
(MU803784)
C-49 <M/T>
(MU803773)
C-56 <M/T>
(MU803770)
NOTE
*1:ECM connector C-49 <M/T>
*2:ECM connector C-56 <M/T>
*3:PCM connector C-50 <A/T>
*4:PCM connector C-54 <A/T>
1
14
4
19
5
22
6
17
8
15
9
18
7
20
16
2
13
12
23 24 25 26
21
3
10 11
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
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
58
60 61
53
52
51
55
54
56
59
62
57
58
<M/T>*2
43
<A/T>*4
10
<M/T>*1
11
<A/T>*3
23
<M/T>*1
12
<A/T>*3
ENGINE CONTROL
MODULE (ECM) <M/T>
OR
POWERTRAIN CONTROL
MODULE (PCM) <A/T>
WHITE
WHITE
1
ENGINE SPEED
DETECTION
CONNECTOR
1
A-12X
MATER AND
GAUGE
24
10A
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-878
.
AK300063
CONNECTORS: B-16, B-21
AB
B-21 (GR)
B-16 (GR)
AK300060
ECM
CONNECTORS: C-49, C-56 <M/T>
AJ
C-56 (G)
C-49 (G)
AK300060
PCM
CONNECTORS: C-50, C-54 <A/T>
AO
C-54 (GR)
C-50 (GR)
AK300116
CONNECTOR: C-87
AB
C-87
AK300123
CONNECTOR: C-108
AB
C-108
AK300124
CONNECTOR: C-111
AB
C-111
AK300092
CONNECTOR: C-07
AB
C-07
AK300112
ENGINE SPEED
DETECTION
CONNECTOR
CONNECTOR: A-12X
AB
A-12X
AK300118
CONNECTOR: C-89
AC
C-89
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-879
CIRCUIT OPERATION
• The ignition coil is energized by Battery positive
voltage from the ignition switch.
• When the ECM <M/T> or PCM <A/T> turns off its
internal power transistor, battery positive voltage
is applied to the ignition power transistor (termi-
nal No. 3) inside the ignition coil, causing the igni-
tion power transistor to be turned on.
• If the ignition power transistor is turned on, the
primary circuit of the ignition coil is energized by
grounding the ignition coil through terminal No. 2,
causing the primary current to flow to the ignition
coil.
.
TROUBLESHOOTING HINTS (The most likely
causes for this case: )
• Malfunction of the ignition coil.
• Malfunction of the ignition power transistor.
• Improper connector contact, open circuit or
short-circuited harness wire.
• Malfunction of the ECM <M/T> or PCM <A/T>.
DIAGNOSIS
STEP 1. Check the ignition coil.
Refer to GROUP 16, Ignition System
− On-vehicle service −
Ignition Coil Check
Q: Are there any abnormalities?
YES : Go to Step 2.
NO : Replace the ignition coil. Then confirm that the
malfunction symptom is eliminated.
STEP 2. Check harness connector B-16, B-21 at ignition
coil for damage.
Q: Is the harness connector in good condition?
YES : Go to Step 3.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then confirm that the
malfunction symptom is eliminated.
AK300742
1
2
3
CONNECTORS: B-16, B-21
AB
B-21 (GR)
B-16 (GR)
HARNESS CONNECTOR:
COMPONENT SIDE
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-880
STEP 3. Measure the power supply voltage at ignition coil
connectors B-16, B-21.
(1) Disconnect the connector B-16, B-21 and measure at the
harness side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 1 and ground.
• Voltage should be battery positive voltage.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is battery positive voltage (approximately 12 volts)
present?
YES : Go to Step 4.
NO : Check the connector C-07, C-89, C-108 and C-111 at
intermediate connectors for damage, and repair or
replace as required. Refer to GROUP 00E, Harness
Connector Inspection
. If intermediate
connector are in good condition, repair harness wire
between ignition switch connectors C-87 (terminal No.
2) and ignition coil connectors B-16, B-21 (terminals
No. 1) because of open circuit. Then confirm that the
malfunction symptom is eliminated.
STEP 4. Check the circuit at ignition coil harness side
connector B-16, B-21.
(1) Disconnect the connectors B-16, B-21 and measure at the
harness side.
(2) Engine cranking.
(3) Measure the voltage between terminal No. 3 and ground.
• Voltage should be 0.3 and 3.0 volts.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage between 0.3 and 3.0 volts?
YES : Go to Step 7.
NO : Go to Step 5.
AK300742
1
2
3
CONNECTORS: B-16, B-21
AB
B-21 (GR)
B-16 (GR)
HARNESS CONNECTOR:
COMPONENT SIDE
AK000414AJ
B-16, B-21 HARNESS
CONNECTORS:
COMPONENT SIDE
1
2
3
AK300742
1
2
3
CONNECTORS: B-16, B-21
AB
B-21 (GR)
B-16 (GR)
HARNESS CONNECTOR:
COMPONENT SIDE
AK000415 AK
B-16, B-21 HARNESS
CONNECTORS:
COMPONENT SIDE
1
2
3
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