Mitsubishi Montero (2004+). Manual - part 1075

M-ASTC DIAGNOSIS

TSB Revision

MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM

35C-11

STEP 2. Check the active skid control switch continuity.

(1) Remove the active skid control switch (Refer to 

P.35A-136

).

(2) Connect an ohmmeter between to active skid control switch 

connector terminals.

Q: Is the active skid control switch in good condition?

YES : Go to Step 3.
NO :  Replace the active skid control switch, and then go to 

Step 9.

STEP 3. Check the ground to the active skid control 
switch. Measure the resistance at active skid control 
switch connector E-125.

(1) Disconnect active skid control switch connector E-125, and 

measure the resistance at the harness-side connector.

(2) Measure the resistance between active skid control switch 

connector E-125 terminal 3 and body ground.

• The resistance should measure 2 ohms or less.

Q: Does the resistance measure 2 ohms or less?

YES : Go to Step 5.
NO :  Go to Step 4.

ACTIVE SKID 
CONTROL 
SWITCH 
CONDITION

TESTER 
CONNECTION

SPECIFIED 
CONDITION

ON

3 

− 6

Less than 2 ohms

2 

− 3, 2 - 6

Open circuit

Neutral

2 

− 3, 2 − 6, 3 − 6 Open circuit

OFF

2 

− 3

Less than 2 ohms

2 

− 6, 3 - 6

Open circuit

AC204445

6

2

5

4

3

1

AB

ON

OFF

AC204176

CONNECTOR: E-125

3

1

4

5

6

2

HARNESS SIDE

AH

AC204581

HARNESS SIDE: E-125

AU

3

1

4

5

6

2

M-ASTC DIAGNOSIS

TSB Revision

MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM

35C-12

STEP 4. Check the wiring harness between active skid 
control switch connector E-125 terminal 3 and the body 
ground.
NOTE: Also check intermediate connector E-06 for loose, cor-
roded, or damaged terminals, or terminals pushed back in the 
connector. If intermediate connector E-06 is damaged, repair or 
replace the damaged component(s) as described in GROUP 
00E, Harness Connector Inspection 

P.00E-2

. If the connector 

has been repaired or replaced, go to STEP 9.
Q: Is the wiring harness between active skid control switch 

connector E-125 terminal 3 and the body ground in 
good condition?
YES :  Go to Step 9.
NO :  Repair the wiring harness, and then go to Step 9.

STEP 5. Check the wiring harness between M-ASTC-ECU 
connector E-121 terminal 78 and the body ground.
NOTE: Also check intermediate connector E-06 and E-122 for 
loose, corroded, or damaged terminals, or terminals pushed 
back in connectors. If intermediate connector E-06 or E-122 is 
damaged, repair or replace the damaged component(s) as 
described in GROUP 00E, Harness Connector Inspection 

P.00E-2

. If the connector has been repaired or replaced, go to 

STEP 9.
Q: Is the wiring harness between M-ASTC-ECU connector 

E-121 terminal 78 and the body ground in good 
condition?
YES : Go to Step 6.
NO :  Go to Step 7.

AC204194

CONNECTORS: E-06, E-125

E-125

E-06

E-125

HARNESS SIDE

AD

E-06

3

1

4

5

6

2

22

2021

10

9

8

1718

6 7

19

1415

4 5

1112

1 2 3

13

16

AC204194

CONNECTORS: E-06, E-121, E-122, E-125

E-125

E-06

E-121

E-125

E-122(L)

HARNESS SIDE

HARNESS SIDE

AE

E-121

E-06

E-122(L)

3

1

4

5

6

2

22

2021

10

9

8

1718

6 7

19

1415

4 5

1112

1 2 3

13

16

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-13

STEP 6. Check the wiring harness between active skid 
control switch connector E-125 terminal 6 and 
M-ASTC-ECU connector E-121 terminal 78.
NOTE: Also check intermediate connector E-06 and E-122 for 
loose, corroded, or damaged terminals, or terminals pushed 
back in connectors. If intermediate connector E-06 or E-122 is 
damaged, repair or replace the damaged component(s) as 
described in GROUP 00E, Harness Connector Inspection 

P.00E-2

. If the connector has been repaired or replaced, go to 

STEP 9.
Q: Is the wiring harness between active skid control switch 

connector E-125 terminal 6 and M-ASTC-ECU connector 
E-121 terminal 78 in good condition?
YES : Go to Step 7.
NO :  Repair the wiring harness, and then go to Step 9.

STEP 7. Check the wiring harness between M-ASTC-ECU 
connector E-121 terminal 85 and the body ground.
NOTE: Also check intermediate connector E-06 and E-122 for 
loose, corroded, or damaged terminals, or terminals pushed 
back in connectors. If intermediate connector E-06 or E-122 is 
damaged, repair or replace the damaged component(s) as 
described in GROUP 00E, Harness Connector Inspection 

P.00E-2

. If the connector has been repaired or replaced, go to 

STEP 9.
Q: Is the wiring harness between M-ASTC-ECU connector 

E-121 terminal 85 and the body ground in good 
condition?
YES : Go to Step 9.
NO :  Go to Step 8.

AC204194

CONNECTORS: E-06, E-121, E-122, E-125

E-125

E-06

E-121

E-125

E-122(L)

HARNESS SIDE

HARNESS SIDE

AE

E-121

E-06

E-122(L)

3

1

4

5

6

2

22

2021

10

9

8

1718

6 7

19

1415

4 5

1112

1 2 3

13

16

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

AC204194

CONNECTORS: E-06, E-121, E-122, E-125

E-125

E-06

E-121

E-125

E-122(L)

HARNESS SIDE

HARNESS SIDE

AE

E-121

E-06

E-122(L)

3

1

4

5

6

2

22

2021

10

9

8

1718

6 7

19

1415

4 5

1112

1 2 3

13

16

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-14

STEP 8. Check the wiring harness between active skid 
control switch connector E-125 terminal 2 and 
M-ASTC-ECU connector E-121 terminal 85.
NOTE: Also check intermediate connector E-06 and E-122 for 
loose, corroded, or damaged terminals, or terminals pushed 
back in connectors. If intermediate connector E-06 or E-122 is 
damaged, repair or replace the damaged component(s) as 
described in GROUP 00E, Harness Connector Inspection 

P.00E-2

. If the connector has been repaired or replaced, go to 

STEP 9.
Q: Is the wiring harness between active skid control switch 

connector E-125 terminal 2 and M-ASTC-ECU connector 
E-121 terminal 85 in good condition?
YES : Replace the M-ASTC-ECU, and then go to Step 9.
NO :  Repair the wiring harness, and then go to Step 9.

STEP 9. Recheck for diagnostic trouble code.
Q: Does DTC 17 reset?

YES : Return to Step 1.
NO :  The procedure is complete.

AC204194

CONNECTORS: E-06, E-121, E-122, E-125

E-125

E-06

E-121

E-125

E-122(L)

HARNESS SIDE

HARNESS SIDE

AE

E-121

E-06

E-122(L)

3

1

4

5

6

2

22

2021

10

9

8

1718

6 7

19

1415

4 5

1112

1 2 3

13

16

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