Mitsubishi Galant 9G. Manual — part 1201
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-1104
STEP 7. Check for continuity at PCM harness side
connector B-20.
(1) Disconnect the connector B-20 and measure at the harness
side.
(2) Check for the continuity between terminals (No. 25, No. 29)
and ground.
• Should be less than 2 ohms.
Q: Does continuity exist?
YES : Go to Step 8.
NO : Check harness connector A-14 at grounding
connector for damage, and repair or replace as
required. Refer to, GROUP 00E, Harness Connector
Inspection. If grounding connector is good condition,
repair harness wire between PCM connector B-20
(terminal No. 25, No. 29) and ground because of open
circuit. Then confirm that the malfunction symptom is
eliminated.
AK303092
25
21
24 23 22
29 28 27 26
34 33 32 31 30
38 37 36 35
43 42 41 40 39
CONNECTOR: B-20
B-20
PCM
AB
HARNESS CONNECTOR:
COMPONENT SIDE
AIR CLEANER
25
21
24 23 22
29 28 27 26
34 33 32 31 30
38 37 36 35
43 42 41 40 39
AK303250
B-20 HARNESS
CONNECTOR:
COMPONENT SIDE
AB
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-1105
STEP 8. Measure the power supply voltage at PCM harness
side connector B-21.
(1) Disconnect the connector B-21 and measure at the harness
side.
(2) Measure the voltage between terminal No. 52 and ground.
• Voltage should be battery positive voltage.
Q: Is battery positive voltage (approximately 12 volts)
present?
YES : Go to Step 9.
NO : Repair harness wire between MFI relay connector
B-17X (terminal No. 3) and PCM connector B-21
(terminal No. 52) because of open circuit. Then
confirm that the malfunction symptom is eliminated.
AK303018
55
56
54 53 52 51
57
62 61 60 59 58
63
69 68 67 66 65 64
70
75 74 73 72 71
76
82 81 80 79 78 77
83
CONNECTOR: B-21
PCM
AB
HARNESS CONNECTOR:
COMPONENT SIDE
AIR CLEANER
B-21 (B)
55
56
54 53 52 51
57
62 61 60 59 58
63
69 68 67 66 65 64
70
75 74 73 72 71
76
82 81 80 79 78 77
83
AK303251
B-21 HARNESS
CONNECTOR:
COMPONENT SIDE
AB
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-1106
STEP 9. Measure the power supply voltage at PCM harness
side connector B-21.
(1) Disconnect the connector B-21 and measure at the harness
side.
(2) Using a jumper wire, connect terminal No. 52 to ground.
(3) Measure the voltage between terminals (No. 51, No. 64)
and ground.
• Voltage should be battery positive voltage.
Q: Is battery positive voltage (approximately 12 volts)
present?
YES : Replace the PCM. Then confirm that the malfunction
symptom is eliminated.
NO : Repair harness wire between MFI relay connector
B-17X (terminal No. 4) and PCM connector B-21
(terminals No. 51, No. 64) because of open circuit.
Then confirm that the malfunction symptom is
eliminated.
AK303018
55
56
54 53 52 51
57
62 61 60 59 58
63
69 68 67 66 65 64
70
75 74 73 72 71
76
82 81 80 79 78 77
83
CONNECTOR: B-21
PCM
AB
HARNESS CONNECTOR:
COMPONENT SIDE
AIR CLEANER
B-21 (B)
AK303252
55
56
54 53 52 51
57
62 61 60 59 58
63
69 68 67 66 65 64
70
75 74 73 72 71
76
82 81 80 79 78 77
83
B-21 HARNESS CONNECTOR:
COMPONENT SIDE
AB
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-1107
INSPECTION PROCEDURE 29: Fuel pump system.
AK302879
1 2 3
4
4 5 6
1 2
WHITE
WHITE
3
VIOLET
VIOLET
5
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
CK
BLA
CK
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
1
3
2
4 5 6
C-215
MU801331
6
BLUE-WHITE
1
6
4 5
11
10
12 13 14
8 9
7
2 3
C-204
C-211
C-211
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
C-211
3 4
1 2
3 4
1 2
24
15A
17
7.5A
C-204
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
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