Mitsubishi Montero Sport (2004+). Manual - part 166

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-77

STEP 16. Check connector C-91 at PCM for damage.
Q: Is the connector in good condition?

YES : Go to Step 17.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then go to Step 18.

STEP 17. Check for short circuit to ground and harness 
damage between manifold absolute pressure sensor 
connector A-12 (terminal No. 1) and PCM connector C-91 
(terminal No. 91).
Q: Is the harness wire in good condition?

YES : Replace the manifold absolute pressure sensor. Then 

go to Step 18.

NO :  Repair it. Then go to Step 18.

AK104028

98

78

71

88

89

76

77

72
79
91

73
80

74

75

81
92

82

83

93

84

85

94

86

87

95

96

90

97

AB

CONNECTOR: C-91

C-91(GR)

HARNESS CONNECTOR:
COMPONENT SIDE

AK200034

2 1

3

AB

CONNECTOR: A-12

A-12(B)

HARNESS 
CONNECTOR:
COMPONENT 
SIDE

AK104028

98

78

71

88

89

76

77

72
79
91

73
80

74

75

81
92

82

83

93

84

85

94

86

87

95

96

90

97

AB

CONNECTOR: C-91

C-91(GR)

HARNESS CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-78

STEP 18. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to 

Diagnostic Function 

− OBD-II Drive Cycle − Procedure 6 − 

Other Monitor 

P.13A-4

.

(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0107 set?

YES : Retry the troubleshooting.
NO :  The inspection is complete.

DTC P0108: Manifold Absolute Pressure Circuit High Input

BL

ACK

BL

ACK

2 3

1

GREEN-

YELL

OW

YELL

OW

AK301860

Manifold Absolute Pressure Sensor Circuit

A-12
(MU802723)

1

POWERTRAIN CONTROL MODULE (PCM)

3

2

MANIFOLD ABSOLUTE
PRESSURE SENSOR

12

17

91

57

46

5V

C-90

71

76

77

72 73 74

75

79 80

78

81

87 88

89

91

90

92

97

98

82

93

83

94

84 85

95

86

96

C-91
(MU803782)

47

41

42 43

48 49 50 51 52 53 54 55 56 57

46

45

44

58

59

60 61 62 63

64 65 66

C-90
(MU803781)

1

10

2 3 4 5 6 7 8 9

11

12 13 14 15 16 17 18 19 20 21 22

23 24 25 26 27 28 29 30 31 32 33

C-71

C-91

JOINT
CONNEC-
TOR (4)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-79

.

CIRCUIT OPERATION

• A 5-volt voltage is supplied to the manifold abso-

lute pressure sensor power terminal (terminal No. 
3) from PCM (terminal No. 46). The ground termi-
nal (terminal No. 2) is grounded with PCM (termi-
nal No. 57).

• A voltage that is proportional to the intake mani-

fold pressure is sent to the PCM (terminal No. 91) 
from the manifold absolute pressure sensor out-
put terminal (terminal No. 1).

.

TECHNICAL DESCRIPTION

• The manifold absolute pressure sensor outputs a 

voltage which corresponds to the intake manifold 
pressure.

• The PCM checks whether this voltage is within a 

specified range.

.

DESCRIPTIONS OF MONITOR METHODS
Manifold absolute pressure sensor output voltage is 

out of specified range.

.

MONITOR EXECUTION
Continuous

.

MONITOR EXECUTION CONDITIONS (Other 
monitor and Sensor)

Other Monitor (There is no temporary DTC stored 

in memory for the item monitored below)

• Not applicable

Sensor (The sensor below is determined to be 

normal)

• Engine coolant temperature sensor

• Throttle position sensor

.

AK200033AC

CONNECTOR: A-12

MANIFOLD
ABSOLUTE
PRESSURE
SENSOR

A-12(B)

AK103738AE

CONNECTORS: C-90, C-91

PCM

C-91(GR)

C-90(GR)

AK103912AB

CONNECTOR: C-71

C-71

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-80

DTC SET CONDITIONS

Logic Flow Chart

.

Check Conditions

• 8 minutes or more have passed since the starting 

sequence was completed, when the engine cool-
ant temperature at engine start is 0

°C (32°F) or 

lower.

Judgement Criteria

• Manifold Absolute pressure is 117 kPa (34.6 

in.Hg) or higher for 2 seconds.

.

OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function 

− OBD-II Drive Cycle − 

Procedure 6 

− Other Monitor 

P.13A-4

.

.

TROUBLESHOOTING HINTS (The most likely 
causes for this code to be set are: )

• Manifold Absolute pressure sensor failed.

• Open manifold absolute pressure sensor circuit, 

or connector damage.

• PCM failed.

YES

YES

YES

YES

NO

NO

NO

NO

MONITORING

CONDITIONS

PRESSURE < 4.9kPa (1.4in.Hg)

PRESSURE > 117kPa (34.6in.Hg)

CONTINUOUS

FAILURE FOR 2secs

MALFUNCTION

END

GOOD

START

AK301416