Mitsubishi Lancer Evolution X. Manual - part 423

 

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Mitsubishi Lancer Evolution X. Manual - part 423

 

 

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-757

Inspection procedure 21: Generator output voltage is low (approximately 12.3 volts)

.

CIRCUIT OPERATION

• The ECM controls generator out put current by 

duty-controlling continuity between the generator 
G terminal (terminal No. 1) and ground.

.

TROUBLESHOOTING HINTS (The most 
likely causes for this charging system:)

• Malfunction of the charging system.
• Short circuit in harness between generator G ter-

minal and ECM.

• Malfunction of the ECM.

DIAGNOSIS

Required Special Tool:

• MB991923: Power Train ECU Check Harness

4

3

2

1

AK704301

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

YELLO

W

-GREEN

ENGINE CONTROL MODULE

GENERATOR

VOLTAGE
REGULATOR

B-111

(MU802066)

1

60

B-09

GENERATOR CIRCUIT

AC

AK704227

Connector: B-09

ECM

B-09 (GR)

AB

AK704288

Connector: B-111

B-111 (GR)

AB

Generator

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-758

STEP 1. Measure the voltage at ECM connector B-09 by 
using poor plant ECU check harness special tool 
MB992110.
(1) Disconnect all ECM connectors. Connect the power plant 

ECU check harness special tool MB992110 between the 
separated connectors.

(2) Start the engine and run at idle.

(3) Measure the voltage between terminal No. 60 and ground.

NOTE: Vehicle for Canada, the headlight, taillight, etc. 
remain lit even when the lighting switch is in "OFF" position 
but this is no problem for checks.

a. Engine: warming up, idling
b. Radiator fan: stopped

c. Headlight: OFF to ON

d. Stop light: OFF to ON
e. Rear defogger switch: OFF to ON

• Voltage increases

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage within the specified range?

YES : Go to Step 2.
NO :  Replace the generator. Then confirm that the 

malfunction symptom is eliminated.

STEP 2. Check harness connector B-09 at ECM connector 
and harness connector B-111 at generator connector 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 

Connector Inspection 

P.00E-2

. Then confirm that the 

malfunction symptom is eliminated.

AK604040

ECM

AB

Body side harness 

MB992110

AK604041

16 15 14 13 12 11 10 9 8 7 6 5 4 3

2

1

32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17

48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33

64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49

AC

Power plant ECU
check harness connector

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-759

STEP 3. Check for short circuit to ground between 
generator connector B-111 (terminal No. 1) and ECM 
connector B-09 (terminal No. 60).
Q: Is the harness wire in good condition?

YES : Replace the ECM. When the ECM is replaced, 

register the ID code. Refer to GROUP 42B, Diagnosis 
− ID Code Registration Judgment Table <Vehicles with 

KOS> 

P.42B-14

 or GROUP 42C, Diagnosis − ID 

Codes Registration Judgment Table <Vehicles with 
WCM> 

P.42C-10

.

NO :  Repair it. Then confirm that the malfunction symptom 

is eliminated.

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-760

Inspection procedure 22: Power supply system and ignition switch-IG system

1

3

2

4

71 72 73 74 75 76 77 78 79 80 81 82

83 84 85 86 87 88 89 90 91 92 93 94

95 96 97 98 99

100 101 102 103 104

112 113 114

109

108

107

110 111

115 116

106

105

118

117

AK704351

1 2 3
4 5 6

1

6

4

5

9

8

10 11

13

15

14

12

16

7

2 3

1 2 3 4

5 6 7

15

14

13

12

11

10

9

8

1

12 13 14 15 16 1718 19 20 2122 2324

2 3 4 5

6 7 8 9 10 11

IG2

ST

LOCK

ACC

IG1

93

81

20A

WHITE

WHITE

WHITE

A-34X

MFI
RELAY

4

3

1

2

ETACS-ECU

C-304

C-317

10

22

7.5A

2

OFF

ON

POWER SUPPLY AND IGNITION SWITCH-IG CIRCUIT

RELAY BOX
(ENGINE COMPARTMENT)

WHITE

WHITE-BLUE

RED-BLA

CK

RED-GREEN

RED-GREEN

73

104

82

GND

GND

92

B-10

IGNITION SWITCH

2

BATTERY
BACKUP

POWER
SOURCE

AC

ENGINE CONTROL MODULE

BLACK

BLA

CK-RED

BLA

CK-WHITE

C-210

FUSIBLE LINK 36

15

13

J/C (7)

C-50

6

 

 

 

 

 

 

 

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