Mitsubishi L200. Manual — part 854

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55A-32

earth terminal 19.

AC402679

Connector A-33
(Harness side)

CL

(4) Voltage between terminal 1 and body earth.

OK: System voltage

Q: Is the check result normal?

YES :

Go to Step 9.

NO :

Go to Step 3.

STEP 3. Connector check: A-21X A/C
compressor relay connector

AC502574

AC

Connector: A-21X

Harness side

Q: Is the check result normal?

YES :

Go to Step 4.

NO :

Repair the connector.

STEP 4. Check the A/C compressor relay
continuity.
Refer to

P.55A-66

.

Q: Is the A/C compressor relay in good condition?

YES :

Go to Step 5.

NO :

Replace the A/C compressor relay.

STEP 5. Voltage measurement at A-21X A/C
compressor relay connector.

AC502574

AC

Connector: A-21X

Harness side

(1) Remove the relay, and measure at the junction

block side.

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

AC402679

Connector A-21X
(Harness side)

CM

(3) Voltage between terminal 1 and body earth.

OK: System voltage

Q: Is the check result normal?

YES :

Go to Step 7.

NO :

Go to Step 6.

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55A-33

STEP 6. Check the wiring harness between A-21X
A/C compressor relay connector terminal No.1
and the ignition switch (IG2).

AC502574

AC

Connector: A-21X

Harness side

NOTE:

AC509975AH

Connector: A-28

A-28 (B)

AC509934 AX

Connectors: C-207, C-210 <LHD>

Harness side

C-207

C-210

Junction block (Front view)

Harness side

C-207

C-210

AC509936 AU

Connectors: C-207, C-210 <RHD>

Harness side

C-207

C-210

Junction block (Front view)

Harness side

C-207

C-210

Prior to the wiring harness inspection, check interme-
diate connector A-28, junction block connector C-210
and C-207, and repair if necessary.

• Check the A/C compressor relay power supply

line for open circuit.

Q: Is the check result normal?

YES :

The trouble can be an intermittent

malfunction (Refer to GROUP 00, How to
Cope with Intermittent Malfunction ).

NO :

Repair the wiring harness.

STEP 7. Voltage measurement at A-21X A/C
compressor relay connector.

AC502574

AC

Connector: A-21X

Harness side

(1) Remove the relay, and measure at the junction

block side.

AC402679

Connector A-21X
(Harness side)

CN

(2) Voltage between terminal 4 and body earth.

OK: System voltage

Q: Is the check result normal?

YES :

Go to Step 9.

NO :

Go to Step 8.

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55A-34

STEP 8. Check the wiring harness between A-21X
A/C compressor relay connector terminal No.4
and the fusible link (20).

AC502574

AC

Connector: A-21X

Harness side

NOTE:

AC509975AI

Connector: A-115

Prior to the wiring harness inspection, check interme-
diate connector A-115, and repair if necessary.

• Check the A/C compressor relay power supply

line for open circuit.

Q: Is the check result normal?

YES :

The trouble can be an intermittent

malfunction (Refer to GROUP 00, How to
Cope with Intermittent Malfunction ).

NO :

Repair the wiring harness.

STEP 9. Check the wiring harness between A-21X
A/C compressor relay connector terminal No.3
and A-33 A/C compressor and clutch assembly
connector terminal No.1.

AC502574

AC

Connector: A-21X

Harness side

AC509975 AU

Connectors: A-27, A-28, A-33

A-27

A-28

A-27 (B)

A-28 (B)

A-33

A-33 (B)

Harness side

NOTE: Prior to the wiring harness inspection, check
intermediate connector A-28 and A-27, and repair if
necessary.

• Check the A/C compressor relay power supply

line for open circuit.

Q: Is the check result normal?

YES :

Go to Step 10.

NO :

Repair the wiring harness.

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55A-35

STEP 10. Check the wiring harness between A-
21X A/C compressor relay connector terminal
No.2 and C-105 engine-ECU connector terminal
No.40.

AC502574

AC

Connector: A-21X

Harness side

AC509613 CD

Harness side

C-105 (B)

Connector: C-105 <LHD>

35

40

41

42

1817

38

39

15

16

14

3736

12

13

11

32

8

3433

9

10

30

31

7 6

29

5

4

28

3

27

2

26

1

25

19
43

2120

22

23

46

47

4544

24
48

76

52

86

62

63

64

65

66

67

68

69

70

71

72

92

95

96

93

94

89

90

91

8887

53

54

55

56

57

58

59

60

61

83

8584

8281

78

79

80

77

49

50

51

74

75

73

AC509930 CA

C-105 (B)

Connector: C-105 <RHD>

Harness side

35

40

41

42

1817

38

39

15

16

14

3736

12

13

11

32

8

3433

9

10

30

31

7 6

29

5

4

28

3

27

2

26

1

25

19
43

2120

22

23

46

47

4544

24
48

76

52

86

62

63

64

65

66

67

68

69

70

71

72

92

95

96

93

94

89

90

91

8887

53

54

55

56

57

58

59

60

61

83

8584

8281

78

79

80

77

49

50

51

74

75

73

• Check the A/C compressor power supply line for

open circuit.

Q: Is the check result normal?

YES :

Go to Step 11.

NO :

Repair the wiring harness.

STEP 11. Check the A/C compressor clutch
operation.
Refer to

P.55A-81

.

Q: Can the sound of the A/C compressor clutch (click)

be heard?
YES :

The trouble can be an intermittent

malfunction (Refer to GROUP 00, How to
Cope with Intermittent Malfunction ).

NO :

Replace the A/C compressor clutch.