Mitsubishi Montero (2004+). Manual - part 1079

M-ASTC DIAGNOSIS

TSB Revision

MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM

35C-27

DTC 63, 64, 65, 71, 72, 73, 76, 77: Trouble in G and yaw rate sensor system

G and Yaw Rate Sensor Power Supply Circuit

AC204615

AC204170

CONNECTOR: D-01

AY

AC204173

CONNECTORS: D-208, D-212

D-208

D-212

AX

M-ASTC DIAGNOSIS

TSB Revision

MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM

35C-28

.

CIRCUIT OPERATION
The M-ASTC-ECU gathers information regarding lat-
eral and longitudinal gravities and yaw rate, through 
the CAN bus line from the G and yaw rate sensor.

.

M-ASTC DTC SET CONDITION
DTC 62, 63, 64, 65, 71, 72, 73, 76 or 77 is set if the 
M-ASTC-ECU detects any trouble in the G and yaw 
rate sensor system. In this case, the G and yaw rate 
sensor is sending data to the ECU, but the data con-
tains a fault.

.

TROUBLESHOOTING HINTS
The most likely causes for DTC 74 to set are:

• The G and yaw rate 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

AC204176

CONNECTOR: E-111

AK

AC204175

CONNECTOR: E-126

AD

E-126(GR)

FLOOR 
CONSOLE

M-ASTC DIAGNOSIS

TSB Revision

MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM

35C-29

STEP 1. Using scan tool MB991958, check data list.

(1) Confirm that the vehicle is not canted to one side or corner.

CAUTION

To prevent damage to scan tool MB991958, always turn the 
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(2) Connect scan tool MB991958 to the data link connector.
(3) Turn the ignition switch to the "ON" position.
(4) Check that the G and yaw rate sensor output signal is 

approximately 0 m/s

2

.

(5) Remove the G and yaw rate sensor with the wire and 

connector attached.

(6) When the G and yaw rate sensor is inclined, the readings 

on data list following items should change.

• Item 19: G SENSOR VOLT

• Item 20: G S(LATERAL)

• Item 22: G SENS VOLT 1

• Item 23: G SENS VOLT 2

Q: When the G and yaw rate sensor is inclined, do the 

readings on data list following items should change?
YES : Go to Step 8.
NO :  Go to Step 2.

STEP 2. Check the power supply system from the ignition 
switch (IG1) to the G and yaw rate sensor. Measure at G 
and yaw rate sensor connector E-126.

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

measure the voltage at the harness-side connector.

(2) Turn the ignition switch to the "ON" position.

(3) Measure the voltage between G and yaw rate sensor 

connector E-126 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.

AC307591 AC

MB991911

MB991824

MB991827

AC307591

DATA LINK

CONNECTOR

AC204175

CONNECTOR: E-126

HARNESS SIDE

E-126(GR)

E-126(GR)

AB

FLOOR 
CONSOLE

1

2

4 3

AC204580

HARNESS SIDE: E-126

AO

1

2

4 3

M-ASTC DIAGNOSIS

TSB Revision

MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM

35C-30

STEP 3. 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 4.
NO :  Repair or replace the connector, and then go to Step 

9.

STEP 4. Check the wiring harness between G and yaw rate 
sensor connector E-126 terminal 1 and the ignition switch 

(IG1).

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