Mitsubishi Montero (2004+). Manual - part 1080

M-ASTC DIAGNOSIS

TSB Revision

MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM

35C-31

NOTE: Also check joint connector D-01 and junction block con-
nector D-208 and D-212 and intermediate connector E-11 for 
loose, corroded, or damaged terminals, or terminals pushed 
back in the connectors. If joint connector D-01 or junction block 
connector D-208 or D-212 or intermediate connector E-11 are 
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 G and yaw rate sensor 

connector E-126 terminal 1 and the ignition switch (IG1) 
in good condition?
YES : Go to Step 9.
NO :  Repair the wiring harness, and then go to Step 9.

AC204170

CONNECTOR: D-01

AB

9 10

8

6 7

31 32

30

29

18 19 20 21

5

4

2

1

3

27

26

24

23

25

12 13 14 15 16 17

28

11
22
33

AC204191

CONNECTORS: D-208, D-212

D-208

AN

HARNESS SIDE

HARNESS SIDE

D-212

D-208

D-212

1

2

3

5

6

4

7 6 5

2 1

9 8

11 10

4 3

AC204176

CONNECTOR: E-11

AB

3

10

16

9

7 8

6

1

4

2

5

11

14

1213

15

M-ASTC DIAGNOSIS

TSB Revision

MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM

35C-32

STEP 5. Check G and yaw rate sensor for ground circuit. 
Measure at G and yaw rate sensor connector E-126.

(1) Disconnect G and yaw rate sensor connector E-126, and 

measure the resistance at the harness-side connector.

(2) Measure the resistance between G and yaw rate sensor 

connector E-126 terminal 4 and body ground.

• The resistance should measure 2 ohms or less.

Q: Does the resistance measure 2 ohms or less?

YES : Go to Step 8.
NO :  Go to Step 6.

STEP 6. Check G and yaw rate sensor connector E-126.

Q: Is G and yaw rate sensor connector E-126 in good 

condition?
YES : Go to Step 7.
NO :  Repair or replace the connector, and then go to Step 

9.

STEP 7. Check the wiring harness between G and yaw rate 
sensor connector E-126 terminal 4 and body ground.

Q: Is the wiring harness between G and yaw rate sensor 

connector E-126 terminal 4 and the body ground in 
good condition?
YES : Go to Step 9.
NO :  Repair the wiring harness, and then go to Step 9.

AC204175

CONNECTOR: E-126

HARNESS SIDE

E-126(GR)

E-126(GR)

AB

FLOOR 
CONSOLE

1

2

4 3

AC204581

HARNESS SIDE: E-126

AT

1

2

4 3

AC204175

CONNECTOR: E-126

HARNESS SIDE

E-126(GR)

E-126(GR)

AB

FLOOR 
CONSOLE

1

2

4 3

AC204175

CONNECTOR: E-126

HARNESS SIDE

E-126(GR)

E-126(GR)

AB

FLOOR 
CONSOLE

1

2

4 3

M-ASTC DIAGNOSIS

TSB Revision

MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM

35C-33

STEP 8. Replace the G and yaw rate sensor (Recheck for 
diagnostic trouble code).

Replace the G and yaw rate sensor, and check that the DTC 
sets.
Q: Does DTC 63, 64, 65, 71, 72, 73, 76 or 77 reset?

YES : Replace the M-ASTC-ECU, and then go to Step 9.
NO :  The procedure is complete.

STEP 9. Recheck for diagnostic trouble code.
Q: Does DTC 63, 64, 65, 71, 72, 73, 76 or 77 reset?

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

DTC 66, 68, 83: Trouble in steering wheel sensor system

Steering Wheel Sensor Power Supply Circuit

AC204614

M-ASTC DIAGNOSIS

TSB Revision

MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM

35C-34

.

CIRCUIT OPERATION
The M-ASTC-ECU gathers information regarding the 
steering operation, through the CAN bus line from 
the steering wheel sensor.

.

M-ASTC DTC SET CONDITION
DTC 66, 68 or 83 is set if there is a fault in the data 
which M-ASTC-ECU receives from the steering 
wheel sensor. In this case, the steering wheel sensor 
is sending data to the ECU, but the data contains a 
fault.

.

TROUBLESHOOTING HINTS
The most likely causes for DTC 66, 68 or 83 to set 
are:

• The steering wheel sensor is defective.

• Damaged harness wires and connectors

• The M-ASTC-ECU is defective.

DIAGNOSIS 

Required Special Tools:

•  MB991958: Scan Tool (MUT-III Sub Assembly)

• MB991824: Vehicle Communication Interface (V.C.I.)

• MB991827: MUT-III USB Cable

• MB991911: MUT-III Main Harness B

• MB991223: Harness Set

AC204170

CONNECTORS: D-02, D-28

BI

D-28

D-02

AC204172

CONNECTOR: D-225

AH

AC204173

CONNECTORS: D-208, D-210

D-208

D-210

AR