Mitsubishi Galant 9G. Manual — part 1199
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-1096
INSPECTION PROCEDURE 28: Power supply system and ignition switch - IG system.
AK400836
6
2 3
4 5 6
BLA
CK-
WHITE
1
1
3
2
4 5
BLA
CK-ORANGE
RED-WHITE
RED
RED
RED
SKY BLUE
RED-
WHITE
RED-
WHITE
RED-
WHITE
RED-
WHITE
WHITE
BLA
CK
BATTERY
R
IG2
ST
LOCK
ACC
IG1
C-308
C-215
MU801331
IGNITION
SWITCH
2
6
1
JUNCTION BLOCK
43
42
MFI
RELAY
B-17X
A-14
(MU802755)
1
2
4
3
52
BATTERY
BACKUP
64
51
POWER
SOURCE
BLA
C
K
29
POWERTRAIN CONTROL
MODULE (PCM)
GROUNDING
CONNECTOR
B-20
B-21
5
9
20A
25
17
7.5A
RELAY
BOX
Power Supply and Ignition Switch-IG Circuit
3 4
1 2
C-214
(MU801857)
A-13
1 2 3
4 5 6
7
12
11
10
14
13
9
8
1 2
3 4 5
14
15
8 9
12 13
6 7
10 11
16 17
RED-
WHITE
22
21
23 24 25
26 27 28 29
30 31 32 33 34
35 36 37 38
39 40 41 42 43
52
51
53 54 55 56
57
58 59 60 61 62
63
64 65 66 67 68 69
70
71 72 73 74 75
76
77 78 79 80 81 82
83
3
2
OFF
ON
1
2 3
4
5 6
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-1097
.
AK303241
CONNECTORS: B-20, 21
PCM
AB
AIR CLEANER
B-20
B-21 (B)
AK303148
CONNECTOR: A-13
AB
A-13(GR)
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
AK303014
CONNECTOR: B-17X
MFI RELAY
MFI RELAY
FRONT OF VEHICLE
B-17X
AB
AK203191
CONNECTOR: C-308
C-308
AB
AK303243
CONNECTOR: C-214
AB
JUNCTION
BLOCK
C-214
AK303244
CONNECTOR: C-215
AB
JUNCTION
BLOCK
C-215
AK303190
CONNECTOR: A-14
A-14 (GR)
AB
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-1098
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 PCM (terminal No. 43). When the battery pos-
itive voltage is applied, the PCM turns the power
transistor in the PCM "ON" and grounds the MFI
relay coil. With this, the MFI relay turns "ON" and
the battery positive voltage is supplied to the
PCM (terminals No. 51, No. 64) from the MFI
relay (terminal No. 4).
• A battery positive voltage is constantly supplied
to the PCM (terminal No. 42) as the backup
power.
• The PCM (terminals No. 25, No. 29) 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-circuit harness wire.
• Disconnected PCM ground wire.
• Malfunction of the PCM.
DIAGNOSIS
STEP 1. Check harness connector B-17X 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
. Then confirm that the
malfunction symptom is eliminated.
1
2
3
4
AK303017
CONNECTOR: B-17X
FRONT OF VEHICLE
B-17X
AB
HARNESS
CONNECTOR:
COMPONENT SIDE
RELAY BOX
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-1099
STEP 2. Check the MFI relay.
CAUTION
Because it is not possible to distinguish the top and the
bottom of the MFI relay, inspect it with the triangle mark
printed on the relay facing upward.
(1) Remove the MFI relay.
(2) Check for continuity between the MFI relay terminals No. 2
and No. 3.
• There should be continuity. (approximately 70 ohms)
(3) Use jumper wires to connect MFI relay terminal No. 2 to the
positive battery terminal and terminal No. 3 to the negative
battery terminal.
(4) Check for 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 resistance within the specified range?
YES : Go to Step 3.
NO : Replace the MFI relay. Then confirm that the
malfunction symptom is eliminated.
1
2
3
4
AK303017
CONNECTOR: B-17X
FRONT OF VEHICLE
B-17X
AB
HARNESS
CONNECTOR:
COMPONENT SIDE
RELAY BOX
AK204164
1
2
3
4
MFI RERAY
SIDE
CONNECTOR
AB
1
2
3
4
AK203257
MFI RELAY SIDE
CONNECTOR
AB
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