Mitsubishi Montero (2004+). Manual - part 1099

M-ASTC DIAGNOSIS

TSB Revision

MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM

35C-107

YES : Go to Step 8.
NO :  Repair the wiring harness wires between joint 

connector (9) and the resistor connector.

STEP 8. Measure the voltage in the CAN_H line. Measure 
the voltage 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 
multimeter, the equipments, which are connected through 
the CAN communication lines, may be damaged.
(1) Disconnect joint connector (9) D-131 and steering wheel 

sensor connector D-225, 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 2 and body ground.

• The voltage should measure one volt or less.

AC204170

CONNECTOR: D-131

AT

6

1

9 8

2

7

10

12 11

4

5

3

AC204172

CONNECTOR: D-225

HARNESS SIDE

AD

3 2

1

4

5

AC204580

HARNESS SIDE: D-131

AH

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-108

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: Do the voltage measure one volt or less?

YES : Go to Step 9.
NO :  Repair the wiring harness wires between joint 

connector (9) and the steering wheel sensor 
connector.

STEP 9. Measure the voltage in the CAN_H line. Measure 
the voltage 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 
multimeter, the equipments, which are connected through 
the CAN communication 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.

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

M-ASTC DIAGNOSIS

TSB Revision

MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM

35C-109

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 6 and body ground.

• The voltage should measure one volt or less.

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: 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.

AC204580

HARNESS SIDE: D-131

AK

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 10. 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 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 9 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

MALE CONNECTOR: E-122

AJ

TEST 
HARNESS

1

12

2

13

3

14

4

15

5

16

6

17

7

18

8

19

9

20

10

21

11

22