Mitsubishi Eclipse. Manual — part 562
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-791
STEP 5. Check the power supply voltage at idle air control
motor harness side connector B-34.
(1) Disconnect the connector B-34 and measure at the harness
side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 2, No. 5 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 7.
NO : Go to Step 6.
STEP 6. Check connector A-18X at MFI relay for damage.
Q: Is the connector in good condition?
YES : Repair harness wire between MFI relay connector
A-18X (terminal No. 4) and idle air control motor
connector B-34 (terminal No. 2, No. 5) because of
open circuit or short circuit to ground. Then go to Step
14.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 14.
AK300438
1
2
3
4
5
6
CONNECTOR: B-34
AB
B-34 (B)
HARNESS CONNECTOR:
COMPONENT SIDE
AKX01428
3 2 1
B-34 HARNESS
CONNECTOR:
HARNESS SIDE
AO
6 5 4
AK300454
2
1
3
4
CONNECTOR: A-18X
AB
A-18X
HARNESS CONNECTOR:
COMPONENT SIDE
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-792
STEP 7. Check the power supply voltage at ECM connector
C-51 <M/T> or PCM connector C-52 <A/T> by backprobing.
(1) Do not disconnect the connector C-51 <M/T> or C-52
<A/T>.
(2) Measure the voltage between terminal No. 14, No. 15, No.
28, No. 29 and ground by backprobing.
• The voltage is 1 volt or lower for approximately 3 sec-
onds, then changes to the battery positive voltage when
the Ignition switch is turned from the "LOCK" (OFF)
position to the "ON" position.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is battery positive voltage (approximately 12 volts)
present?
YES : Go to Step 10.
NO : Go to Step 8.
AK300458
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
CONNECTOR: C-52 <A/T>
C-52 (GR)
AB
HARNESS CONNECTOR:
COMPONENT SIDE
AK300443
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
CONNECTOR: C-51 <M/T>
C-51 (GR)
AB
HARNESS CONNECTOR:
COMPONENT SIDE
AKX01550
1
2
3 4
5 6
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
C-51<M/T>, C-52<A/T>
HARNESS CONNECTOR:
HARNESS
SIDE
AG
9
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-793
STEP 8. Check connector C-51 at ECM <M/T> or connector
C-52 at PCM <A/T> for damage.
Q: Is the connector in good condition?
YES : Go to Step 9.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 14.
AK300458
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
CONNECTOR: C-52 <A/T>
C-52 (GR)
AB
HARNESS CONNECTOR:
COMPONENT SIDE
AK300443
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
CONNECTOR: C-51 <M/T>
C-51 (GR)
AB
HARNESS CONNECTOR:
COMPONENT SIDE
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-794
STEP 9. Check for open circuit and short circuit to ground
between idle air control motor connector B-34 and ECM
connector C-51 <M/T> or PCM connector C-52 <A/T>.
a. Idle air control motor connector B-34 terminal 1 and ECM
connector C-51 (terminal No. 14) <M/T> or PCM connector
C-52 (terminal No. 14) <A/T>.
b. Idle air control motor connector B-34 (terminal No. 3) and
ECM connector C-51 (terminal No. 28) <M/T> or PCM con-
nector C-52 (terminal No. 28) <A/T>.
c. Idle air control motor connector B-34 (terminal No. 4) and
ECM connector C-51 (terminal No. 15) <M/T> or PCM con-
nector C-52 (terminal No. 15) <A/T>.
d. Idle air control motor connector B-34 terminal 6 and ECM
connector C-51 (terminal No. 29) <M/T> or PCM connector
C-52 (terminal No. 29) <A/T>.
Q: Is the harness wire in good condition?
YES : Replace the ECM or PCM. Then go to Step 14.
NO : Repair it. Then go to Step 14.
AK300438
1
2
3
4
5
6
CONNECTOR: B-34
AB
B-34 (B)
HARNESS CONNECTOR:
COMPONENT SIDE
AK300443
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
CONNECTOR: C-51 <M/T>
C-51 (GR)
AB
HARNESS CONNECTOR:
COMPONENT SIDE
AK300458
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
CONNECTOR: C-52 <A/T>
C-52 (GR)
AB
HARNESS CONNECTOR:
COMPONENT SIDE
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