Mitsubishi Lancer Evolution X. Manual — part 429
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-781
STEP 23. Check for open circuit between fuel pump relay 1
connector A-28X (terminal No. 3) and ETACS-ECU
connector C-307 (terminal No. 1).
Q: Is the harness wire in good condition?
YES : Go to Step 24.
NO : Repair or replace it. Then confirm that the malfunction
symptom is eliminated.
STEP 24. Check harness connector A-34X at MFI relay for
damage.
Q: Is the connector in good condition?
YES : Go to Step 25.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then confirm that the
malfunction symptom is eliminated.
STEP 25. Check for open circuit and short circuit to
ground between fuel pump relay 1 connector A-27X
(terminal No. 4) and MFI relay connector A-34X (terminal
No. 2).
Q: Is the harness wire in good condition?
YES : Go to Step 26.
NO : Repair or replace it. Then confirm that the malfunction
symptom is eliminated.
STEP 26. Check for harness damage between fuel pump
relay 1 connector A-27X (terminal No. 1) and ECM
connector B-09 (terminal No. 51).
NOTE: Check harness after checking intermediate connector
A-13. If intermediate connector is damaged, repair or replace it.
Refer to GROUP 00E, Harness Connector Inspection
Then check that the malfunction is eliminated.
Q: Is the harness wire in good condition?
YES : Repair harness wire between fuel pump relay 1
connector A-27X (terminal No. 2) and MFI relay
connector A-34X (terminal No. 2) because of harness
damage. Then confirm that the malfunction symptom
is eliminated.
NO : Repair or replace it. Then confirm that the malfunction
symptom is eliminated.
STEP 27. Check for harness damage between fuel pump
connector D-22 (terminal No. 5) and ETACS-ECU connector
C-314 (terminal No. 1).
Q: Is the harness wire in good condition?
YES : Go to Step 28.
NO : Repair or replace it. Then confirm that the malfunction
symptom in eliminated.
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-782
STEP 28. Check for harness damage between fuel pump
circuit resistor connector A-58 (terminal No. 2) and
ETACS-ECU connector C-307 (terminal No. 1).
Q: Is the harness wire in good condition?
YES : Go to Step 29.
NO : Repair or replace it. Then confirm that the malfunction
symptom is eliminated.
STEP 29. Check harness connector A-34X at MFI relay for
damage.
Q: Is the connector in good condition?
YES : Go to Step 30.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then confirm that the
malfunction symptom is eliminated.
STEP 30. Check for harness damage between MFI relay
connector A-34X (terminal No. 2) and fuel pump resistor
connector A-58 (terminal No. 1).
Q: Is the harness wire in good condition?
YES : Go to Step 31.
NO : Repair or replace it. Then confirm that the malfunction
symptom is eliminated.
STEP 31. Check for harness damage between fuel pump
relay 1 connector A-27X (terminal No. 3) and ETACS-ECU
connector C-307 (terminal No. 1).
Q: Is the harness wire in good condition?
YES : Go to Step 32.
NO : Repair or replace it. Then confirm that the malfunction
symptom is eliminated.
STEP 32. Check for harness damage between fuel pump
relay 1 connector A-27X (terminal No. 4) and MFI relay
connector A-34X (terminal No. 2).
Q: Is the harness wire in good condition?
YES : Go to Step 33.
NO : Repair or replace it. Then confirm that the malfunction
symptom is eliminated.
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-783
STEP 33. Using scan tool MB991958, check actuator test
item 9: 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
9, Fuel Pump.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the fuel pump operating properly?
YES : It can be assumed that this malfunction is intermittent,
Refer to GROUP 00, How to Use Troubleshooting −
Inspection Service Points − How to Cope with
Intermittent Malfunctions
.
NO : Replace the ECM. When the ECM is replaced,
register the ID code. Refer to GROUP 42B, ID Code
Registration Necessity Judgment Table <Vehicles
with KOS>
or GROUP 42C, ID Codes
Registration Judgment Table <Vehicles with WCM>
.
AC608435
Data link connector
MB991827
MB991824
MB991910
AB
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
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MULTIPORT FUEL INJECTION (MFI)
13A-784
Inspection procedure 24: Ignition switch-ST system and starter relay system <M/T>
M
71 72 73 74 75 76 77 78 79 80 81 82
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95 96 97 98 99
100 101 102 103 104
112 113 114
109
108
107
110 111
115 116
106
105
118
117
7
3
8
1
4
9
13 14
16
15
10 11 12
17 18 19
2
5 6
1
6
4
5
9
8
10 11
13
15
14
12
16
7
2 3
1 2 3
4 5 6
AK900379
1
2 1
1 2 3
4 5 6
1
2
3 4 5 6 7 8 9 10 11 12 13 14 15 16
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48
49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64
1
1
1
2
3
4
B-10
B-09
C-304
STARTER
OFF
ON
OFF
ON
1
OFF
ON
1
106
6
B-09
B-10
105
15
7
2
IG2
ST
LOCK
IG1
5
B-109
(MU801211)
C-51
MU801669
CLUTCH
INTERLOCK
SWITCH
B-108
A-28X
3
3
1
4
2
WHITE
GREEN
GREEN
ORANGE
LIGHT
GREEN
A-39
MU802607
C-315
MU801890
C-210
IGNITION SWITCH
AB
FUSIBLE LINK 24
1
GREEN
B-17
MU802655
1
6
ENGINE
CONTROL
MODULE
ETACS-ECU
ACC
STARTER
RELAY
BATTERY
BLA
CK
BLA
CK
BLA
CK
BLA
CK
BLA
CK-RED
BLA
CK-RED
BLUE-RED
BLUE-RED
STARTING SYSTEM CIRCUIT <M/T>
BLA
CK-RED
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