Mitsubishi Eclipse. Manual — part 600
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-943
STEP 9. Check connector B-01 or B-05 or B-26 at right
bank injector for damage.
(1) Check the injector connector, which deviated from the
standard value listed in Step 7.
Q: Is the connector in good condition?
YES : Repair harness wire between injector intermediate
connector and right bank injector connector because
of harness damage. Then confirm that the
malfunction symptom is eliminated.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then confirm that the
malfunction symptom is eliminated.
STEP 10. Check connector B-48 at the injector
intermediate connector for damage.
Q: Is the connector in good condition?
YES : Go to Step 11.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then confirm that the
malfunction symptom is eliminated.
STEP 11. Check connector B-02, B-06, B-25 at the left bank
injector for damage.
Q: Is the connector in good condition?
YES : Go to Step 12.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then confirm that the
malfunction symptom is eliminated.
AK300752
1
2
CONNECTORS: B-01, B-05, B-26
AB
B-05 (GR) B-26 (GR)
B-01 (GR)
HARNESS CONNECTOR:
COMPONENT SIDE
AK300751
1
2
3
4
CONNECTOR: B-48
AB
B-48 (B)
HARNESS CONNECTOR:
COMPONENT SIDE
AK300753
1
2
CONNECTORS: B-02, B-06, B-25
AB
B-02 (GR)
B-06 (GR) B-25 (GR)
HARNESS CONNECTOR:
COMPONENT SIDE
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-944
STEP 12. Check the connector C-51 at the ECM <M/T> or
connector C-52 at the PCM <A/T> for damage.
Q: Is the connector in good condition?
YES : Go to Step 13.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then confirm that the
malfunction symptom is eliminated.
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-945
STEP 13. Check for harness damage between injector
connector and ECM connector <M/T> or PCM connector
<A/T>.
a. Check the harness wire between injector connector
B-01 (terminal No. 2) and ECM connector C-51 (termi-
nal No. 1) <M/T> or PCM connector C-52 (terminal No.
1) <A/T> when checking No. 1 cylinder injector.
b. Check the harness wire between injector connector
B-02 (terminal No. 2) and ECM connector C-51 (termi-
nal No. 9) <M/T> or PCM connector C-52 (terminal No.
9) <A/T> when checking No. 2 cylinder injector.
c. Check the harness wire between injector connector
B-05 (terminal No. 2) and ECM connector C-51 (termi-
nal No. 24) <M/T> or PCM connector C-52 (terminal No.
24) <A/T> when checking No. 3 cylinder injector.
d. Check the harness wire between injector connector
B-06 (terminal No. 2) and ECM connector C-51 (termi-
nal No. 2) <M/T> or PCM connector C-52 (terminal No.
2) <A/T> when checking No. 4 cylinder injector.
e. Check the harness wire between injector connector
B-26 (terminal No. 2) and ECM connector C-51 (termi-
nal No. 10) <M/T> or PCM connector C-52 (terminal No.
10) <A/T> when checking No. 5 cylinder injector.
f. Check the harness wire between injector connector
B-25 (terminal No. 2) and ECM connector C-51 (termi-
nal No. 25) <M/T> or PCM connector C-52 (terminal No.
25) <A/T> when checking No. 6 cylinder injector.
Q: Is the harness wire in good condition?
YES : Check the following items, and repair or replace the
defective items.
a. Check the ignition coil, spark plugs, spark plug
cables.
b. Check if the injectors are clogged.
c. Check the compression pressure.
d. Check if the foreign materials (water,
kerosene, etc.) got into fuel.
Then confirm that the malfunction symptom is
eliminated.
NO : Repair it. Then confirm that the malfunction symptom
is eliminated.
AK300754
1
2
CONNECTORS: B-01, B-02, B-05, B-06,
B-25, B-26
AB
B-01 (GR)
B-05 (GR)
B-26 (GR)
B-02 (GR)
B-06 (GR)
B-25 (GR)
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
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-946
INSPECTION PROCEDURE 8: Unstable Idle (Rough Idle, Hunting).
.
COMMENT
• In cases such as the above, the cause is proba-
bly the air/fuel mixture or idle air control motor.
Other systems affecting idle quality include the
ignition system and compression.
.
TROUBLESHOOTING HINTS (The most likely
causes for this case: )
• Malfunction of the ignition system.
• Malfunction of air/fuel ratio control system.
• Malfunction of the IAC system.
• Malfunction of the evaporative emission purge
solenoid system.
• Poor compression pressure.
• Vacuum leak.
• Malfunction of the EGR vacuum regulator sole-
noid valve system.
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991911: Main Harness B
STEP 1. Check if the battery terminal is disconnected.
Q: Has the battery terminal been disconnected lately?
YES : Start the engine and let it run at idle for approximate
10 minutes after engine warm up. Then, if a
malfunction occurs, go to Step 2.
NO : Go to Step 2.
STEP 2. Using scan tool MB991958, read the diagnostic
trouble code (DTC).
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch is to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Read the DTC.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC set?
YES : Refer to, Diagnostic Trouble Code Chart
.
NO : Go to Step 3.
AK300810
AB
MB991911
16-PIN
MB991827
MB991824
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