Mitsubishi Montero (2002-2004). Manual - part 1115

M-ASTC DIAGNOSIS

TSB Revision

MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM

35C-77

STEP 9. Measure the voltage in the CAN_L line. Measure the 
voltage 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 voltage at joint connector (9).

(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 joint connector (9) D-131 terminal 

11 and body ground.

• The voltage should measure one volt or less.

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: Do the voltage measure one volt or less?

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

AC204580

HARNESS SIDE: D-131

AM

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-78

STEP 10. 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 connector E-122 and steering 

wheel sensor connector D-225, and measure the resistance 
at the male intermediate connector (instrument 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.

(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 : Replace the steering wheel sensor.
NO :  Go to Step 11.

AC204172

CONNECTOR: D-225

HARNESS SIDE

AD

3 2

1

4

5

AC204176

CONNECTOR: E-122

E-122(L)

MALE SIDE

E-122(L)

AF

1

12

2

13

3

14

4

15

5

16

6

17

7

18

8

19

9

20

10

21

11

22

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-79

STEP 11. Check the resistance in the CAN_L line. Measure 
at joint connector (9) D-131.

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 joint connector (9) D-131, 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 
communication 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 12 and body ground.

• The resistance should be infinite.

CAUTION

If you repair the CAN bus line of the instrument panel wir-
ing harness 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 connected to the G and yaw rate sen-
sor 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 communication 
may be caused.
Q: Is the resistance infinite?

YES : Go to Step 12.
NO :  Repair the wiring harness wires between joint 

connector (9) and the data link connector.

AC204170

CONNECTOR: D-131

AT

6

1

9 8

2

7

10

12 11

4

5

3

AC204581

HARNESS SIDE: D-131

AS

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-80

STEP 12. Check the resistance in the CAN_L 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 resistor connector D-

130, 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 4 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 :  Go to Step 13.
NO :  Repair the wiring harness wires between joint connector (9) 

and the resistor connector.

AC204188

CONNECTORS: D-130, D-131

D-131

AQ

HARNESS SIDE

HARNESS SIDE

D-131

D-130

D-130

6

1

9 8

2

7

10

12 11

4

5

3

1
2

AC204581

HARNESS SIDE: D-131

AN

TEST 
HARNESS

6

1

9 8

2

7

10

12 11

4

5

3