Mitsubishi Montero (2002-2004). Manual - part 1123

M-ASTC DIAGNOSIS

TSB Revision

MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM

35C-109

STEP 14. Check the resistance in the CAN_H line. Measure at 
joint connector (9) D-131.

CAUTION

Before checking CAN bus lines and their interconnected compo-
nents, "ground" yourself, by touching a metal object such as an 
unpainted pipe, this will discharge any potentially damaging 
static that may have built up.

CAUTION

When measuring resistance value or voltage in CAN bus lines, 
use a digital multimeter. If not using a digital multimeter, the 
equipments, which are connected through the CAN communica-
tion lines, may be damaged.
(1) Disconnect joint connector (9) D-131 and intermediate connector 

E-122, and measure the resistance between joint connector (9) 
and body ground.

(2) Turn the ignition switch to the LOCK (OFF) position.

CAUTION

Disconnect the negative battery terminal when measuring the 
resistance value in the CAN bus line. If you fail to do so, the 
equipments, which are connected through the CAN communica-
tion lines, may be damaged.
(3) Disconnect the negative battery terminal.

CAUTION

Always use the test harness when measuring the voltage or 
resistance value at the female connector. If you fail to do so, 
connectors may be damaged.
(4) Measure the resistance between joint connector (9) D-131 

terminal 6 and body ground.

• The resistance should be infinite.

CAUTION

If you repair the CAN bus line of the instrument panel wiring har-
ness assembly (the wiring harness connected to the steering 
wheel sensor, the data link connector and the resistor) and the 
transmission wiring harness assembly (the wiring harness con-
nected to the G and yaw rate sensor connector and intermediate 
connector E-123), observe the precautions regarding how to 
repair wiring harness. If a new wire is added or a splice point is 
modified for the CAN_L or CAN_H line, an error in the CAN com-
munication may be caused.
Q: Is the resistance infinite?

YES :  Retest the system.
NO :  Repair the wiring harness wires between joint connector (9) 

and the intermediate connector.

AC204170

CONNECTOR: D-131

AT

6

1

9 8

2

7

10

12 11

4

5

3

AC204176

CONNECTOR: E-122

E-122(L)

E-122(L)

AD

1

12

2

13

3

14

4

15

5

16

6

17

7

18

8

19

9

20

10

21

11

22

AC204581

HARNESS SIDE: D-131

AP

TEST 
HARNESS

6

1

9 8

2

7

10

12 11

4

5

3

M-ASTC DIAGNOSIS

TSB Revision

MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM

35C-110

STEP 15. Measure the voltage in the CAN_H line. Check at 
intermediate connector E-122.

CAUTION

Before checking CAN bus lines and their interconnected 
components, "ground" yourself, by touching a metal 
object such as an unpainted pipe, this will discharge any 
potentially damaging static that may have built up.

CAUTION

When measuring resistance value or voltage in CAN bus 
lines, use a digital multimeter. If not using a digital multim-
eter, the equipments, which are connected through the 
CAN communication lines, may be damaged.
(1) Disconnect intermediate connectors E-122, E-123, and M-

ASTC-ECU connector E-121, power control module 
connector D-134, and measure the voltage at the female 
intermediate connector (control panel wiring harness side).

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

AC204171

CONNECTOR: D-134

HARNESS SIDE

D-134(GR)

D-134(GR)

AE

80

87

73

66

67

65
74

81

75

82

6261

72

68

69

70

71

78

85

77

8483

76

79

86

63

64

8988

AC204194

CONNECTORS: E-121, E-122, E-123

E-123(GR)

E-123(GR)

E-122(L)

E-121

HARNESS SIDE

AK

E-121

E-122(L)

2

6

14

7

9 8

10

4

12

3

11

19

16

1817

15

1

5

13

1

12

2

13

3

14

4

15

5

16

6

17

7

18

8

19

9

20

10

21

11

22

71

77

83

72

78

84

73

79

85

74

80

75

81

86

76

82

87

M-ASTC DIAGNOSIS

TSB Revision

MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM

35C-111

CAUTION

Always use the test harness when measuring the voltage 
or resistance value at the female connector. If you fail to do 
so, connectors may be damaged.
(3) Measure the voltage between intermediate connector E-

122 terminal 9 and body ground.

• The voltage should measure one volt or less.

Q: Do the voltage measure one volt or less?

YES : Go to Step 16.
NO :  Replace the control wiring harness assembly.

AC204580

FEMALE CONNECTOR: E-122

AD

11

22

10

21

9

20

8

19

7

18

6

17

5

16

4

15

3

14

2

13

1

12

TEST 
HARNESS

M-ASTC DIAGNOSIS

TSB Revision

MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM

35C-112

STEP 16. Check the resistance in the CAN_H line. Check at 
intermediate connector E-122.

CAUTION

Before checking CAN bus lines and their interconnected 
components, "ground" yourself, by touching a metal 
object such as an unpainted pipe, this will discharge any 
potentially damaging static that may have built up.

CAUTION

When measuring resistance value or voltage in CAN bus 
lines, use a digital multimeter. If not using a digital multim-
eter, the equipments, which are connected through the 
CAN communication lines, may be damaged.
(1) Disconnect intermediate connectors E-122, E-123, and M-

ASTC-ECU connector E-121, power control module 
connector D-134, and measure the resistance at the female 
intermediate connector (control panel wiring harness side).

(2) Turn the ignition switch to the LOCK (OFF) position.

CAUTION

Disconnect the negative battery terminal when measuring 
the resistance value in the CAN bus line. If you fail to do 
so, the equipments, which are connected through the CAN 
communication lines, may be damaged.
(3) Disconnect the negative battery terminal.

AC204171

CONNECTOR: D-134

HARNESS SIDE

D-134(GR)

D-134(GR)

AE

80

87

73

66

67

65
74

81

75

82

6261

72

68

69

70

71

78

85

77

8483

76

79

86

63

64

8988

AC204194

CONNECTORS: E-121, E-122, E-123

E-123(GR)

E-123(GR)

E-122(L)

E-121

HARNESS SIDE

AK

E-121

E-122(L)

2

6

14

7

9 8

10

4

12

3

11

19

16

1817

15

1

5

13

1

12

2

13

3

14

4

15

5

16

6

17

7

18

8

19

9

20

10

21

11

22

71

77

83

72

78

84

73

79

85

74

80

75

81

86

76

82

87