Mitsubishi Eclipse. Manual — part 622
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-1031
AK300096
D-17 (GR)
FUEL PUMP
MODULE
AB
CONNECTOR: D-17
AK300244
CONNECTOR: C-52 <A/T>
AC
PCM
C-52 (GR)
AK300091
CONNECTOR: C-51 <M/T>
ECM
AF
C-51 (GR)
AK300116
CONNECTOR: C-87
AB
C-87
AK300100
CONNECTOR: C-101
AB
C-101
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
AK300127
CONNECTORS: C-105, 107
FUEL PUMP
RELAY (2)
JUNCTION BLOCK
AB
FUEL PUMP
RELAY (1)
C-105
C-107
AK300123
CONNECTOR: C-108
AB
C-108
AK300124
CONNECTOR: C-111
AB
C-111
AK300125
CONNECTOR: C-112
AB
C-112
AK300118
CONNECTOR: C-89
AC
C-89
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-1032
.
CIRCUIT OPERATION
• Battery positive voltage is applied to the fuel
pump relay 1 (terminal No. 3) from the ignition
switch-IG.
Ground is provided through terminal 2 to chassis
ground.
• When the ignition switch is turned to the "ON"
position, the battery positive voltage is applied to
the fuel pump relay 2 (terminal No. 1) from the
fuel pump relay 1 (terminal No. 1).
• A battery positive voltage is applied on the fuel
pump relay 2 (terminal No. 3) from the ignition
switch-IG.
• During cranking and while the engine is running,
the ECM <M/T> or PCM <A/T> turns the power
transistor in the ECM <M/T> or PCM <A/T> ON
to ground the fuel pump relay 2 coil. With this, the
fuel pump relay turns ON, and the battery positive
voltage is supplied to the fuel pump from the fuel
pump relay 2 (terminal No. 4).
.
TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are: )
• Malfunction of the fuel pump relay 1 and 2.
• Malfunction of the fuel pump.
• Improper connector contact, open or
short-circuited harness wire.
• Malfunction of the ECM <M/T> or PCM <A/T>.
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991911: Main Harness B
AK300119
CONNECTOR: C-28
AB
C-28
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-1033
STEP 1. Using scan tool MB991958, check actuator test
item 07: Fuel Pump.
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 to the actuator test mode for item
07, Fuel Pump.
• An operation sound of the fuel pump should be heard.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the fuel pump operating properly?
YES : That this malfunction is intermittent. Refer to GROUP
00, How to Use Troubleshooting/Inspection Service
Points
NO : Go to Step 2.
STEP 2. Check connector C-107 at fuel pump relay 1 and
connector C-105 at fuel pump relay 2 for damage.
Q: Is the 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.
AK300810
AB
MB991911
16-PIN
MB991827
MB991824
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
AK300456
2 1
3
4
2 1
3
4
CONNECTORS: C-105, 107
C-105
C-107
AB
C-107 HARNESS CONNECTOR:
COMPONENT SIDE
C-105 HARNESS CONNECTOR:
COMPONENT SIDE
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-1034
STEP 3. Check the fuel pump relay 1 and 2.
(1) Remove the fuel pump relay 1 and 2.
(2) Check for continuity between the each fuel pump relay
terminals 2 and 3.
• There should be continuity. (approximately 70 Ω)
(3) Use jumper wires to connect each fuel pump relay terminal
3 to the positive battery terminal and terminal 2 to the
negative battery terminal.
(4) Check the continuity between the each fuel pump relay
terminals No. 1 and No. 4 while connecting and
disconnecting the jumper wire at the negative battery
terminal.
• Should be less than 2 ohm. (Negative battery terminal
connected)
• Should be open loop. (Negative battery terminal discon-
nected)
(5) Install the fuel pump relay 1 and 2.
Q: Is the resistance normal?
YES : Go to Step 4.
NO : Replace the fuel pump relay 1 and/or 2. Then confirm
that the malfunction symptom is eliminated.
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
AK300456
2 1
3
4
2 1
3
4
CONNECTORS: C-105, 107
C-105
C-107
AB
C-107 HARNESS CONNECTOR:
COMPONENT SIDE
C-105 HARNESS CONNECTOR:
COMPONENT SIDE
AK103837
2
3 4
1
FUEL PUMP
RELAY SIDE
CONNECTOR
AB
AK103838
1 2
3 4
1 2
3 4
FUEL PUMP
RELAY SIDE
CONNECTOR
AB
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