Mitsubishi Montero (2004+). Manual - part 1119

M-ASTC DIAGNOSIS

TSB Revision

MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM

35C-187

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 values between intermediate 

connector E-123 terminal 2 and G and yaw rate sensor 

connector E-126 terminal 2, and between intermediate 
connector E-123 terminal 6 and G and yaw rate sensor 
connector E-126 terminal 3.

• The resistance should measure 2 ohms 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: Does the resistance measure 2 ohms or less?

YES : . Go to Step 3.
NO : . Repair the wiring harness wires between intermediate 

connector E-123 and the G and yaw rate sensor 
connector.

AC204582

HARNESS SIDE: E-124

AT

HARNESS SIDE: E-123

TEST 
HARNESS

1

2

4 3

2

6

14

7

9 8

10

4

12

3

11

19

16

1817

15

1

5

13

TEST 
HARNESS

AC204582

HARNESS SIDE: E-124

AU

HARNESS SIDE: E-123

TEST 
HARNESS

1

2

4 3

2

6

14

7

9 8

10

4

12

3

11

19

16

1817

15

1

5

13

TEST 
HARNESS

M-ASTC DIAGNOSIS

TSB Revision

MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM

35C-188

STEP 3. Check the wiring harness between intermediate 
connector E-123 and the CAN main bus line.

NOTE: Also check the joint between the communication line 
(connected to intermediate connector E-123) and the CAN 
main bus line.

CAUTION

If there is a problem in the CAN bus line or the connectors 
on the control wiring harness assembly (the wiring har-
ness connected to the M-ASTC-ECU, the power control 
module and intermediate connector E-123), do not attempt 
to repair the wiring harness or connector(s), but replace 
the wiring harness assembly. If a wire is added or the con-
nector(s) are repaired, an error in the CAN communication 
may be caused.
Q: Is the wiring harness between intermediate connector 

E-123 and the CAN main bus line in good condition?
YES : Diagnose the G and yaw rate sensor. Refer to 

P.35C-27

.

NO :  Replace the control wiring harness assembly.

AC204176

CONNECTOR: E-123

AR

E-123(GR)

2

6

14

7

9 8

10

4

12

3

11

19

16

1817

15

1

5

13

E-123(GR)

M-ASTC DIAGNOSIS

TSB Revision

MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM

35C-189

SYMPTOM CHART

M1353001100030

SYMPTOM

INSPECTION 
PROCEDURE NO.

REFERENCE PAGE

Communication between the scan tool and the M-ASTC 
system is not possible.

-

GROUP 13A 

− 

Diagnosis 

P.13A-831

Communication with scan tool is not possible. 
(Communication with Active skid control system only is not 
possible.) 

-

GROUP 35B 

− 

Diagnosis 

P.35B-86

The Active skid control system operation indicator light/Active 
traction control system operation indicator light does not 
illuminate when the ignition switch is on (but does not start the 
engine).

1

P.35C-190

The Active skid control system OFF indicator light does not 
illuminate when the ignition switch is on (but does not start the 
engine).

2

P.35C-195

The Active skid control system operation indicator light/Active 
traction control system operation indicator light does not go off 
after the engine is started.

3

P.35C-200

The Active skid control system OFF indicator light does not go 
off after the engine is started.

4

P.35C-204

M-ASTC DIAGNOSIS

TSB Revision

MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM

35C-190

SYMPTOM PROCEDURES

INSPECTION PROCEDURE 1: When the ignition switch is turned "ON" (Engine stopped or after 
startup), the Active skid control system operation indicator light/Active traction control system 
operation indicator light does not illuminate.

Active Skid Control System Operation Indicator Light/
Active Traction Control System Operation Indicator Light Circuit

AC204546 AB

CONNECTOR: D-03

D-03 (GR)

AC204547AC

CONNECTORS: D-208, D-210

D-208

D-210

JUNCTION BLOCK
(FRONT VIEW)