Mitsubishi Galant 9G. Manual — part 1200
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-1100
STEP 3. Measure the power supply voltage at MFI relay
harness side connector B-17X.
CAUTION
Because it is difficult to distinguish the top and bottom of
the MFI relay connector at the wiring harness, inspect it by
using triangle mark on the junction block as reference.
(1) Disconnect the connector B-17X and measure at the
harness side.
(2) Measure the voltage between terminals 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 A-13 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 relay
box (9) and MFI relay connector B-17X (terminals No.
1, No. 2) because of open circuit. 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
2
1
3
4
AK303247
B-17X HARNESS
CONNECTOR:
COMPONENT SIDE
AB
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-1101
STEP 4. Check harness connector B-20 and B-21 at PCM
for damage.
Q: Is the harness connector in good condition?
YES : Go to Step 5.
NO : Repair or replace it. Refer to GROUP 00E, Harness
. Then confirm that the
malfunction symptom is eliminated.
AK303248
25
21
24 23 22
29 28 27 26
34 33 32 31 30
38 37 36 35
43 42 41 40 39
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
CONNECTORS: B-20, 21
PCM
AIR CLEANER
B-20
B-21 (B)
AB
B-20 HARNESS CONNECTOR:
COMPONENT SIDE
B-21 HARNESS CONNECTOR:
COMPONENT SIDE
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-1102
STEP 5. Measure the ignition switch-IG signal voltage at
PCM harness side connector B-20.
(1) Disconnect the connector B-20 and measure at the harness
side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 43 and ground.
• Voltage should be battery positive voltage.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is battery positive voltage (approximately 12 volts)
present?
YES : Go to Step 6.
NO : Check harness connector C-214 and C-215 at
intermediate connector for damage, and repair or
replace as required. Refer to, GROUP 00E, Harness
Connector Inspection
. If intermediate
connectors are in good condition, repair harness wire
between ignition switch connector C-308 (terminal
No. 2) and PCM connector B-21 (terminal No. 43)
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
AK303249
B-20 HARNESS
CONNECTOR:
COMPONENT SIDE
AB
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-1103
STEP 6. Measure the backup power supply voltage at PCM
harness side connector B-20.
(1) Disconnect the connector B-20 and measure at the harness
side.
(2) Measure the voltage between terminal No. 42 and ground.
• Voltage should be battery positive voltage.
Q: Is battery positive voltage (approximately 12 volts)
present?
YES : Go to Step 7.
NO : Repair harness wire between relay box (9) and PCM
connector B-20 (terminal No. 42) because of short
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
AK303187
B-20 HARNESS
CONNECTOR:
COMPONENT SIDE
AB
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