Mitsubishi Montero Sport (2004+). Manual - part 356

 

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Mitsubishi Montero Sport (2004+). Manual - part 356

 

 

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-837

INSPECTION PROCEDURE 32: A/C system.

.

COMMENT

• When the A/C is "ON," the battery positive volt-

age is applied on the PCM (terminal No. 83) from 
the A/C compressor-ECU. 
When battery positive voltage is applied to the 
PCM, the PCM turns "ON" the power transistor in 
the PCM. The PCM delays A/C engagement 
momentarily while it increases idle r/min. Then 
the A/C compressor clutch relay coil will be ener-
gized. 

With this, the A/C compressor clutch relay turns 
"ON," and the A/C compressor clutch functions.

.

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

• Malfunction of the A/C control system.

• Malfunction of the A/C switch.

• Improper connector contact, open circuit or 

short-circuited harness wire.

• Malfunction of the PCM.

BL

ACK

-YELL

OW

GREEN-

YELL

OW

AK303790

A/C Circuit

20

POWERTRAIN CONTROL MODULE(PCM)

AUTOMATIC
COMPRESSOR-ECU

A/C COMPRESSOR
CLUTCH RELAY

83

10

2

3 4

5 6

7 8

9

11 12 13 14 15 16 17 18 19 20

30

21 22 23

24

25

26 27 28 29

31 32 33

34 35

1

C-89
(MU803784)

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)

AK103738AG

CONNECTORS: C-89, C-91

PCM

C-89(GR) C-91(GR)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-838

DIAGNOSIS

STEP 1. Check harness connector C-89, C-91 at PCM for 
damage.
Q: Is the harness 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 circuit at PCM connector C-89.
(1) Disconnect the connectors C-89 and measure at the 

harness side.

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

(3) Measure the voltage between terminal No. 20 and ground.

• Voltage should be battery positive voltage.

(4) Using a jumper wire, connect terminal No. 20 to ground.

• A/C compressor clutch relay should turn "ON".

(5) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the voltage and A/C compressor clutch relay 

condition normal?
YES : Go to Step 3.
NO :  Refer to GROUP 55, Diagnosis 

− Introduction To 

Heater, Air Conditioning And Ventilation Diagnosis 

P.55-5

. Then confirm that the malfunction symptom is 

eliminated.

AK200055

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

2

3

4

5

6

7

8

9

11

12

13

14

15

16

17

18

19

20

30

21

22

23

24

25

26

27

28

29

31

32

33

34

35

1

10

AB

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

2

3

4

5

6

7

8

9

11

12

13

14

15

16

17

18

19

20

30

21

22

23

24

25

26

27

28

29

31

32

33

34

35

1

10

CONNECTORS: C-89, C-91

C-89(GR) C-91(GR)

C-89 HARNESS CONNECTOR:
COMPONENT SIDE

C-91 HARNESS CONNECTOR:
COMPONENT SIDE

AK103914

2

3

4

5

6

7

8

9

11

12

13

14

15

16

17

18

19

20

30

21

22

23

24

25

26

27

28

29

31

32

33

34

35

1

10

AB

CONNECTOR: C-89

C-89(GR)

HARNESS CONNECTOR:
COMPONENT SIDE

AKX01448

13

14

15

27

12

26

11 10

25

9

24

28

16

17

29

30

18

31

19

20

32

33

21

22

23

6 5

4 3

2

1

7

8

34

35

C-89 HARNESS CONNECTOR: 
COMPONENT SIDE

AT

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-839

STEP 3. Check the circuit at PCM connector C-91.
(1) Disconnect the connectors C-91 and measure at the 

harness side.

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

(3) Measure the voltage between terminal No. 83 and ground.

• Voltage should be 1 volt or less when the A/C switch is 

"OFF".

• Voltage should be battery positive voltage when the A/C 

switch is "ON".

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

YES : Replace the PCM. Then confirm that the malfunction 

symptom is eliminated.

NO :  Refer to GROUP 55, Diagnosis 

− Introduction To 

Heater, Air Conditioning And Ventilation Diagnosis 

P.55-5

. 

DATA LIST REFERENCE TABLE

M1131152000917

CAUTION

• When shifting the selector lever to D range, the brakes should be applied so that the vehicle does 

not move forward.

• Driving tests always need two persons: one driver and one observer.

NOTE: Sensor 1 indicates the sensor mounted at a position closest to the engine, and sensor 2 indicates the 
sensor mounted at the position second close to the engine.
NOTE: Bank 1 indicates the right bank cylinder, and bank 2 indicates the left bank cylinder
NOTE: *

1

: In a new vehicle [driven approximately 500 km (311 mile) or less], the volume airflow sensor output 

frequency is sometimes 10% higher than the standard frequency.
NOTE: *

2

: If the idle speed is lower than the standard value on a very cold engine [approximately 

−

20

°

C 

(

−

4

°

F] even when the IAC motor is fully opened, the air volume limiter built in the throttle body could be defec-

tive.
NOTE: *

3

: The injector drive time represents the time when the cranking speed is at 250 r/min or below when 

the power supply voltage is 11 volts.
NOTE: *

4

: In a new vehicle [driven approximately 500 km (311 mile) or less], the injector drive time is some-

times 10% longer than the standard time.
NOTE: *

5

: In a new vehicle [driven approximately 500 km (311 mile) or less], the step of the stepper motor is 

sometimes 30 steps greater than the standard value.
NOTE: 

*6

: Applicable to GST

NOTE: 

*7

: Vehicles for Canada, the headlight, taillight, etc. remain lit even when the lighting switch is in "OFF" 

position but this is no problem for checks.

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

AKX01449

71

72

73

74

78
90

79
91

80

81
92

8584
95

86
96

75
87

76
88
97

77
89
98

82
93

83
94

C-91 HARNESS CONNECTOR: 
COMPONENT SIDE

AT

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-840

MUT-III 
SCAN 
TOOL 
DISPLAY

ITEM 
NO. 

INSPECTION 
ITEM

INSPECTION REQUIREMENT

NORMAL 
CONDITION

INSPECTION 
PROCEDURE 
NO.

REFERENCE 
PAGE

A/C 
RELAY

49

A/C 
compressor 
clutch relay

Engine: warming up, idling

OFF

Procedure 
No. 32

P.13A-837

Engine: 
warming up, 
idling

A/C 
compressor 
clutch is not 
operating

OFF

A/C 
compressor 
clutch is 
operating

ON

A/C 
SWITCH

28

A/C switch

Engine: warming up, idling

OFF

Procedure 
No. 32

P.13A-837

Engine: 
warming up, 
idling

A/C 
compressor 
clutch is not 
operating

OFF

A/C 
compressor 
clutch is 
operating

ON

BARO 
SENSOR

25

Barometric 
pressure 
sensor

Ignition switch: 
"ON"

At altitude of 0 
m (0 ft)

101 kPa 
(29.8 
in.Hg)

Code 
No.P2227, 
P2228, 
P2229

P.13A-684

, 

P.13A-692

, 

P.13A-707

At altitude of 
600 m (1,969 
ft)

95 kPa 
(28.1 
in.Hg)

At altitude of 
1,200 m 
(3,937 ft)

88 kPa 
(26.0 
in.Hg)

At altitude of 
1,800 m 
(5,906 ft)

81 kPa 
(23.9 
in.Hg)

BATT 
VOLTAGE

16

Battery 
voltage (power 
supply)

Ignition switch: "ON"

Battery 
positive 
voltage

Procedure 
No. 28

P.13A-804

 

 

 

 

 

 

 

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