Mitsubishi Eclipse. Manual — part 618
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-1015
.
CIRCUIT OPERATION
• Battery positive voltage is applied to the MFI
relay (terminals No. 1, No. 2).
• When the ignition switch is turned to the "ON"
position, the battery positive voltage is applied to
the ECM (terminal No. 99) <M/T> or PCM (termi-
nal No. 98) <A/T>. When the battery positive volt-
age is applied, the ECM <M/T> or PCM <A/T>
turns the power transistor in the ECM <M/T> or
PCM <A/T> "ON" and grounds the MFI relay coil.
AK300244
CONNECTORS: C-55, C-59 <A/T>
AD
PCM
C-55 (GR)
C-59 (GR)
AK300091
CONNECTORS: C-58, C-62 <M/T>
ECM
AD
C-58 (GR)
C-62 (GR)
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
AK300116
CONNECTOR: C-87
AB
C-87
AK300092
CONNECTOR: C-07
AB
C-07
AK300121
MFI RELAY
CONNECTOR: A-18X
AB
A-18X
AK300124
CONNECTOR: C-111
AB
C-111
AK300125
CONNECTOR: C-112
AB
C-112
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-1016
With this, the MFI relay turns "ON" and the bat-
tery positive voltage is supplied to the ECM (ter-
minals No. 47, No. 59) <M/T> or PCM (terminals
No. 41, No. 47) <A/T> from the MFI relay (termi-
nal No. 4).
• Battery positive voltage is constantly supplied to
the ECM (terminal No. 60) <M/T> or PCM (termi-
nal No. 66) <A/T> as the backup power.
• The ECM (terminals No. 46, No. 58) <M/T> or
PCM (terminals No. 42, No. 48) <A/T> is
grounded to the vehicle body.
.
TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are: )
• Malfunction of the ignition switch.
• Malfunction of the MFI relay.
• Improper connector contact, open circuit or
short-circuited harness wire.
• Disconnected ECM <M/T> or PCM <A/T> ground
wire.
• Malfunction of the ECM <M/T> or PCM <A/T>.
DIAGNOSIS
STEP 1. Check connector A-18X at MFI relay for damage.
Q: Is the connector in good condition?
YES : Go to Step 2.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then confirm that the
malfunction symptom is eliminated.
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-1017
STEP 2. Check the MFI relay.
(1) Remove the MFI relay.
(2) Check for continuity between the MFI relay terminals 2 and
3.
• There should be continuity. (approximately 70 Ω)
(3) Use jumper wires to connect MFI relay terminal 2 to the
positive battery terminal and terminal 3 to the negative
battery terminal.
(4) Check the continuity between the MFI relay terminals No. 1
and No. 4 while connecting and disconnecting the jumper
wire at the negative battery terminal.
• Should be less than 2 ohms. (Negative battery terminal
connected)
• Should be open loop. (Negative battery terminal discon-
nected)
(5) Install the MFI relay.
Q: Is the measured voltage within the specified range?
YES : Go to Step 3.
NO : Replace the MFI relay. Then confirm that the
malfunction symptom is eliminated.
AK300454
2
1
3
4
CONNECTOR: A-18X
AB
A-18X
HARNESS CONNECTOR:
COMPONENT SIDE
AK204164
1
2
3
4
MFI RERAY
SIDE
CONNECTOR
AB
1
2
3
4
AK203257
MFI RELAY SIDE
CONNECTOR
AB
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-1018
STEP 3. Check the power supply voltage at MFI relay
harness side connector A-18X.
(1) Disconnect the connector A-18X and measure at the
harness side.
(2) Measure the voltage between terminal No. 1, No. 2 and
ground.
• Voltage should be battery positive voltage.
Q: Is battery positive voltage (approximately 12 volts)
present?
YES : Go to Step 4.
NO : Check harness connector C-07 at intermediate
connector for damage, and repair or replace as
required. Refer to, GROUP 00E, Harness Connector
Inspection
. If intermediate connector is in
good condition, repair harness wire between fusible
link (3) and MFI relay connector A-18X terminal 1, 2
because of open circuit. Then confirm that the
malfunction symptom is eliminated.
AK300454
2
1
3
4
CONNECTOR: A-18X
AB
A-18X
HARNESS CONNECTOR:
COMPONENT SIDE
2
1
3
4
AK203258
B-18X HARNESS
CONNECTOR:
COMPONENT SIDE
AC
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