Mitsubishi Montero Sport (2004+). Manual - part 349

 

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Mitsubishi Montero Sport (2004+). Manual - part 349

 

 

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-809

STEP 6. Measure the backup power supply voltage at PCM 
harness side connector C-90.
(1) Disconnect the connector C-90 and measure at the harness 

side.

(2) Measure the voltage between terminal No. 66 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 fusible link (12) and 

PCM connector C-90 (terminal No. 66). Then confirm 
that the malfunction symptom is eliminated.

AK103762

42

43

48

49

50

51

52

53

54

55

56

57

46 45 44

58

59

60

61

62

63

64

65

66

47

41

AB

CONNECTOR: C-90

C-90(GR)

HARNESS CONNECTOR:
COMPONENT SIDE

AKX01436

41

42

43

47

48

49

58

59

50

51

60

61

52
62

53

54

63

64

55

56

57

44

45

46

65

66

C-90 HARNESS 
CONNECTOR: 
COMPONENT SIDE

BA

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-810

STEP 7. Check for continuity at PCM harness side 
connector C-90.
(1) Disconnect the connector C-90 and measure at the harness 

side.

(2) Check for the continuity between terminals No. 42, No. 48 

and ground.

• Should be less than 2 ohms.

Q: Does continuity exist?

YES : Go to Step 8.
NO :  Repair harness wire between PCM connector C-90 

(terminals No. 42, No. 48) and ground. Then confirm 
that the malfunction symptom is eliminated.

AK103762

42

43

48

49

50

51

52

53

54

55

56

57

46 45 44

58

59

60

61

62

63

64

65

66

47

41

AB

CONNECTOR: C-90

C-90(GR)

HARNESS CONNECTOR:
COMPONENT SIDE

AKX01437

41

42

43

47

48

49

58

59

50

51

60

61

52
62

53

54

63

64

55

56

57

44

45

46

65

66

C-90 HARNESS 
CONNECTOR: 
COMPONENT SIDE

AT

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-811

STEP 8. Measure the power supply voltage at PCM harness 
side connector C-90.
(1) Disconnect the connector C-90 and measure at the harness 

side.

(2) Measure the voltage between terminal No. 49 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 

C-59 (terminal No. 2) and PCM connector C-90 
(terminal No. 49). Then confirm that the malfunction 
symptom is eliminated.

AK103762

42

43

48

49

50

51

52

53

54

55

56

57

46 45 44

58

59

60

61

62

63

64

65

66

47

41

AB

CONNECTOR: C-90

C-90(GR)

HARNESS CONNECTOR:
COMPONENT SIDE

AK000379AH

C-90 HARNESS 
CONNECTOR: 
COMPONENT SIDE

41

42

43

44

45

46

47

48

49

50

51

52

53

54

55

56

57

58

59

60

61

62

63

64

65

66

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-812

STEP 9. Measure the power supply voltage at PCM harness 
side connector C-90.
(1) Disconnect the connector C-90 and measure at the harness 

side.

(2) Using a jumper wire, connect terminal No. 49 to ground.
(3) Measure the voltage between terminals No. 41, No. 47 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 :  Check harness connector C-14 at intermediate 

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

P.00E-2

. If intermediate connector C-14 is 

in good condition, repair harness wire between MFI 
relay connector C-59 (terminal No. 1) and PCM 
connector C-90 (terminals No. 41, No. 47). Then 
confirm that the malfunction symptom is eliminated.

AK103762

42

43

48

49

50

51

52

53

54

55

56

57

46 45 44

58

59

60

61

62

63

64

65

66

47

41

AB

CONNECTOR: C-90

C-90(GR)

HARNESS CONNECTOR:
COMPONENT SIDE

AKX01438

41

42

43

47

48

49

58

59

50

51

60

61

52
62

53

54

63

64

55

56

57

44

45

46

65

66

C-90 HARNESS 
CONNECTOR: 
COMPONENT SIDE

AT

 

 

 

 

 

 

 

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