Mitsubishi Eclipse. Manual — part 565
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-803
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991911: Main Harness B
• MB991709: Test Harness
STEP 1. Using scan tool MB991958, read the diagnostic
trouble code (DTC).
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch 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) Set scan tool MB991958, read the DTC.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC P0507 set?
YES : Refer to Diagnostic Trouble Code Chart
NO : Go to Step 2.
STEP 2. Check the intake system vacuum leak.
Q: Are there any abnormalities?
YES : Go to Step 3.
NO : Repair or replace it. Then go to Step 14.
STEP 3. Check connector B-34 at idle air control motor for
damage.
Q: Is the connector in good condition?
YES : Go to Step 4.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 14.
AK300810
AB
MB991911
16-PIN
MB991827
MB991824
AK300438
1
2
3
4
5
6
CONNECTOR: B-34
AB
B-34 (B)
HARNESS CONNECTOR:
COMPONENT SIDE
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-804
STEP 4. Check the idle air control motor coil resistance.
(1) Disconnect the idle air control motor connector B-34.
(2) Measure the resistance between idle air control motor
connector terminal No. 2 and either terminal No. 1 or
terminal No. 3.
Standard value: 28
− 33 ohms [at 20°C (68°F)]
(3) Measure the resistance between idle air control motor
connector terminal No. 5 and either terminal No. 4 or
terminal No. 6.
Standard value: 28
− 33 ohms [at 20° C (68° F)]
Q: Is the measured resistance between 28 and 33 ohms?
YES : Go to Step 5.
NO : Replace the idle air control motor. Then go to Step 14.
AK300438
1
2
3
4
5
6
CONNECTOR: B-34
AB
B-34 (B)
HARNESS CONNECTOR:
COMPONENT SIDE
AKX01561
1 2 3
4 5 6
1 2 3
4 5 6
AB
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-805
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-806
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 terminals 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 the voltage normal?
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
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