Mitsubishi Galant 9G. Manual — part 903
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-1054
INSPECTION PROCEDURE 29: Fuel pump system
1 2 3
4
4 5 6
1 2 3
5
1
3
2
4 5 6
1
6
4 5
11
10
12 13 14
8 9
7
2 3
1
6
4 5
11
10
1213
15
17
16
14
19
18
8 9
7
20
2 3
2122 23 2425 26 27 28
3 4
1 2
3 4
1 2
1 2 3 4
5 6 7
15
14
13
12
11
10
9
8
1 2 3 4
5 6 7
8 9 10 11
12 13 14
15 16 17 18
AK303942
WHITE
WHITE
VIOLET
VIOLET
BLA
C
K
IG2
ST
LOCK
ACC
IG1
C-308
JUNCTION
BLOCK
R
IGNITION
SWITCH
RELAY
BOX
POWERTRAIN CONTROL
MODULE (PCM)
FUEL
PUMP
RELAY (1)
C-210
FUEL
PUMP
RELAY (2)
C-208
FUEL PUMP
MODULE
16
2
D-18
(MU802058)
1
14
11
M
WHITE-BLA
C
K
BLA
C
K
5
4
B-19
Fuel Pump Circuit
OFF
4
2
2
6
1
3
OFF
ON
ON
1
2
4
3
BATTERY
C-214
MU801857
C-29
C-208
C-210
C-215
MU801331
6
BLUE-WHITE
C-204
C-211
C-211
C-211
24
15A
17
7.5A
C-204
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-1055
AK303927AB
CONNECTORS: C-208, C-210
FUEL PUMP RELAY (1)
FUEL PUMP
RELAY (2)
C-210
C-208
AK303918AB
C-29
CONNECTOR: C-29
AK303839AC
CONNECTOR: D-18
SERVICE
HOLE
FUEL PUMP MODULE
D-18 (GR)
AK303924AB
CONNECTOR: C-214
C-214
AK303153
4 3 2 1
7 6 5
9 8
11 10
14 13 12
18 17 16 15
CONNECTOR: B-19
PCM
AB
AIR CLEANER
HARNESS CONNECTOR:
COMPONENT SIDE
B-19 (B)
AK303925AB
CONNECTOR: C-215
C-215
AK303923AB
CONNECTOR: C-308
C-308
AK303915AB
CONNECTOR: C-211
C-211
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-1056
.
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 No. 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).
• Battery positive voltage is applied to the fuel
pump relay 2 (terminal No. 3) from the ignition
switch-IG.
• During cranking and while the engine is running,
the PCM turns the power transistor in the PCM
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.
• Malfunction of the fuel pump.
• Improper connector contact, open or short-circu-
lated harness wire.
• Malfunction of the PCM.
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991910: Main Harness A
AK303929AB
CONNECTOR: C-204
C-204
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-1057
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
− How to Cope with Intermittent Malfunctions
NO : Go to Step 2.
STEP 2. Check harness connector C-210 at fuel pump relay
1 and harness connector C-208 at fuel pump relay 2 for
damage.
Q: Is the harness connector in good condition?
YES : Go to Step 3.
NO : Repair or replace it. Refer to GROUP 00E, Harness
. Then confirm that the
malfunction symptom is eliminated.
AK303804AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
2 1
3
4
AK303930AB
CONNECTORS: C-208, C-210
JUNCTION BLOCK
TRIANGLE MARK
C-208
HARNESS CONNECTOR:
COMPONENT SIDE
C-210
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