Mitsubishi Montero (2002-2004). Manual - part 1117

M-ASTC DIAGNOSIS

TSB Revision

MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM

35C-85

STEP 16. Check the resistance in the CAN_L 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

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1

12

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86

76

82

87

M-ASTC DIAGNOSIS

TSB Revision

MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM

35C-86

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 intermediate connector E-

122 terminal 20 and body ground.

• The resistance should be infinite.

Q: Is the resistance infinite?

YES : Go to Step 17.
NO :  Replace the control wiring harness assembly.

AC204581

FEMALE CONNECTOR: E-122

AG

TEST 
HARNESS

11

22

10

21

9

20

8

19

7

18

6

17

5

16

4

15

3

14

2

13

1

12

M-ASTC DIAGNOSIS

TSB Revision

MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM

35C-87

STEP 17. Measure the voltage in the CAN_L 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 connector E-122 and M-ASTC-

ECU connector E-121, and measure the voltage at the 
female intermediate connector (control wiring harness 
side).

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

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 20 and body ground.

• The voltage should measure 0.5 volts or more, or 4.5 

volts or less.

Q: Does the voltage measure 0.5 volts or more, or 4.5 volts 

or less?
YES : Replace the M-ASTC-ECU.
NO :  Go to Step 18.

AC204194

CONNECTORS: E-121, E-122

E-121

HARNESS SIDE

E-121

E-122(L)

FEMALE CONNECTOR

AH

E-122(L)

71

77

83

72

78

84

73

79

85

74

80

75

81

86

76

82

87

11

22

10

21

9

20

8

19

7

18

6

17

5

16

4

15

3

14

2

13

1

12

AC204580

FEMALE CONNECTOR: E-122

AB

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-88

STEP 18. Measure the voltage in the CAN_L 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 connector E-122 and power 

control module connector D-134, and measure the voltage 
at the female intermediate connector (control wiring 
harness side).

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

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 20 and body ground.

• The voltage should measure 0.5 volts or more, or 4.5 

volts or less.

Q: Does the voltage measure 0.5 volts or more, or 4.5 volts 

or less?
YES : Replace the power control module.
NO :  Go to Step 19.

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

AC204176

CONNECTOR: E-122

E-122(L)

FEMALE SIDE

E-122(L)

AG

11

22

10

21

9

20

8

19

7

18

6

17

5

16

4

15

3

14

2

13

1

12

AC204580

FEMALE CONNECTOR: E-122

AB

11

22

10

21

9

20

8

19

7

18

6

17

5

16

4

15

3

14

2

13

1

12

TEST 
HARNESS