Mitsubishi Montero (2004+). Manual - part 361

 

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Mitsubishi Montero (2004+). Manual - part 361

 

 

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-931

DIAGNOSIS

STEP 1. Check connector C-04 at transmission range 
switch for damage.
Q: Is the connector in good condition?

YES : Go to Step 2.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then confirm that the 

malfunction symptom is eliminated.

STEP 2. Check the transmission range switch.
Refer to GROUP 23A, On-vehicle Service 

− Essential Service − 

Transmission Range Switch Continuity Check 

P.23A-546

.

Q: Are there any abnormalities?

YES : Go to Step 3.
NO :  Repair or replace it. Then confirm that the malfunction 

symptom is eliminated.

STEP 3. Measure the power supply voltage at transmission 
range switch connector C-04.
(1) Disconnect the connector C-04 and measure at the harness 

side.

(2) Turn the ignition switch to the "START" position.

(3) Measure the voltage between terminal No. 10 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 4.
NO :  Check connector E-10 at intermediate connector for 

damage, and repair or replace as required. Refer to 
GROUP 00E, Harness Connector Inspection 

P.00E-2

. If intermediate connector are in good 

condition, repair harness wire between ignition switch 
connector D-204 (terminal No. 5) and transmission 
range switch connector C-04 (terminal No. 10) 
because of open circuit. Then confirm that the 
malfunction symptom is eliminated.

AK201289

3

4

5

8

9

1

2

6

7

10

AB

C-04

CONNECTOR: C-04

HARNESS 
CONNECTOR: 
COMPONENT SIDE

AK201289

3

4

5

8

9

1

2

6

7

10

AB

C-04

CONNECTOR: C-04

HARNESS 
CONNECTOR: 
COMPONENT SIDE

3

4

5

8

9

1

2

6

7

10

AK303223 AB

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-932

STEP 4. Check connector D-133 at PCM for damage.
Q: Is the connector in good condition?

YES : Go to Step 5.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then confirm that the 

malfunction symptom is eliminated.

STEP 5. Check for open circuit and short circuit to ground 
and harness damage between transmission range switch 
connector C-04 (terminal No. 9) and PCM connector D-133 
(terminal No. 51).
Q: Is the harness wire in good condition?

YES : Replace the PCM. Then confirm that the malfunction 

symptom is eliminated.

NO :  Repair it. Then confirm that the malfunction symptom 

is eliminated.

AK200939

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

52

53

54

55

56

57

58

50

51

AB

CONNECTOR: D-133

HARNESS CONNECTOR: 
COMPONENT SIDE

PCM

D-133(GR)

AK201289

3

4

5

8

9

1

2

6

7

10

AB

C-04

CONNECTOR: C-04

HARNESS 
CONNECTOR: 
COMPONENT SIDE

AK200939

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

52

53

54

55

56

57

58

50

51

AB

CONNECTOR: D-133

HARNESS CONNECTOR: 
COMPONENT SIDE

PCM

D-133(GR)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-933

INSPECTION PROCEDURE 31: Ignition Circuit System.

WHITE-

GREEN

WHITE-

GREEN

AK201160

BLUE-

BLA

CK

BLUE-

BLA

CK

2

IG2

ST

LOCK

ACC

IG1

2

IGNITION
SWITCH

R

5

35

87

3

31

44

POWERTRAIN
CONTROL
MODULE (PCM)

D-133

D-134

8

1

2 3

B-25X

INSPECTION
CONNECTOR

METER AND 
GAUGE

3

4 5 6

1 2

D-204

3

2

4 5 6

1

D-208

MU801331

3

2

1

8

5 6 7

4

D-221

(MU801866)

Ignition Circuit

E-111

E-111

7 8

5

3 4

35

34

10 11 12

2122 23 24

13 14 15

25 26 27

16

28

17

18 19 20

29

30 31

32 33

36 37

38

9

1 2

6

61
656667686970 717273
74757677787980 8182
8384

858687

8889

62

6364

D-134

(MU803804)

31

35363738394041 42 43
444546474849

50 51

5253

545556

57 58

32

33 34

D-133

(MU803803)

B

ULE-

BLA

CK

B

ULE-

BLA

CK

B

ULE-

BLA

CK

1

1

B-34

1 2 3

B-32

1 2 3

B-31

1 2 3

YELLO

W

-PINK

BLA

CK-PINK

BLA

CK

BR

O

W

N

BLA

CK

IGNITION
COIL 1

IGNITION
COIL 3

No.4

No.1

IGNITION
COIL 2

2

2

3

No.5

No.2

No.6

No.3

1

BLA

CK

2

3

3

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-934

.

CIRCUIT OPERATION

• The ignition coil is energized by battery positive 

voltage from the ignition switch.

• When the PCM turns off its internal power tran-

sistor, battery positive voltage is applied to the 
ignition power transistor (terminal No. 3) inside 
the ignition coil, causing the ignition power tran-
sistor to be turned on.

• If the ignition power transistor is turned on, the 

primary circuit of the ignition coil is energized by 
grounding the ignition coil through terminal No. 2, 
causing the primary current to flow to the ignition 
coil.

.

TROUBLESHOOTING HINTS (The most likely 
causes for this case: )

• Malfunction of the ignition coil.

• Malfunction of the ignition power transistor.

AK201066AC

B-31(GR)

B-32(GR)

B-34(GR)

CONNECTORS: B-31, B-32, B-34

AK201038AH

CONNECTORS: D-133, D-134

PCM

D-134(GR)

D-133(GR)

AK201294

D-221

AB

CONNECTOR: D-221

AK201045

D-204

AB

CONNECTOR: D-204

AK201041AD

CONNECTOR: D-208

D-208

AK201043

E-111

AB

CONNECTOR: E-111

AK201352AB

B-25X

CONNECTOR: B-25X

 

 

 

 

 

 

 

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