Mitsubishi Montero (2002-2004). Manual - part 1103

M-ASTC DIAGNOSIS

TSB Revision

MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM

35C-29

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.

STEP 8. Replace the G and yaw rate sensor.
Replace the G and yaw rate sensor, and check that the DTC 
sets.
Q: Does the M-ASTC-ECU set any DTC?

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 62, 63, 64, 65, 71, 72, 73, 76 or 77 reset?

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

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-30

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

Steering Wheel Sensor Power Supply Circuit

AC204614

AC204170

CONNECTORS: D-02, D-28

BI

D-28

D-02

AC204172

CONNECTOR: D-225

AH

M-ASTC DIAGNOSIS

TSB Revision

MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM

35C-31

.

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:

• MB991223: Harness Set

• MB991502: Scan Tool (MUT-II)

STEP 1. Using scan tool MB991502, check data list item 25.

CAUTION

To prevent damage to scan tool MB991502, always turn the 
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 to the data link connector 

(16-pin).

(2) Turn the ignition switch to the "ON" position.
(3) When the steering wheel is turned, data list item 25 should 

change.

Q: When the steering wheel is turned, does data list item 

25 change?
YES : Go to Step 11.
NO :  Go to Step 2.

AC204173

CONNECTORS: D-208, D-210

D-208

D-210

AR

M-ASTC DIAGNOSIS

TSB Revision

MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM

35C-32

STEP 2. Check the battery power supply to the steering 
wheel sensor. Measure at steering wheel sensor connector 
D-225.
(1) Disconnect steering wheel sensor connector D-225, and 

measure the voltage at the harness-side connector.

(2) Measure the voltage between steering wheel sensor 

connector D-225 terminal 1 and body ground.

• The voltage should measure battery voltage (approxi-

mately 12 volts).

Q: Does the voltage measure battery voltage 

(approximately 12 volts)?
YES : Go to Step 5.
NO :  Go to Step 3.

STEP 3. Check steering wheel sensor connector D-225.
Q: Is steering wheel sensor connector D-225 in good 

condition?
YES : Go to Step 4.
NO :  Repair or replace the connector, and then go to Step 

12.

AC204172

CONNECTOR: D-225

HARNESS SIDE

AD

3 2

1

4

5

AC204580

3 2

1

4

5

HARNESS SIDE: D-225

AR

AC204172

CONNECTOR: D-225

HARNESS SIDE

AD

3 2

1

4

5