Mitsubishi Outlander GS45X. Manual - part 445

DIAGNOSIS

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ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-207

DTC U1003: G and yaw rate sensor bus-off

CAUTION

• If there is any problem in the CAN bus lines, an incor-

rect diagnostic trouble code may be set. Prior to this 
diagnosis, diagnose the CAN bus lines (Refer to 
GROUP 54C, CAN Bus Diagnosis Table 

P.54C-17

).

• Whenever ECU is replaced, ensure that the CAN bus 

lines are normal.

• Do not drop or shock the G and yaw rate sensor.
• When the G and yaw rate sensor is replaced, always 

carry out calibration to make ASC-ECU learn the neu-
tral point (Refer to 

P.35C-282

).

• When the hydraulic unit (integrated with ASC-ECU) is 

replaced, always carry out the calibration of the steer-
ing wheel sensor, the G and yaw rate sensor and brake 
fluid pressure sensor (Refer to 

P.35C-282

, 

P.35C-283

 

and 

P.35C-284

).

.

G and Yaw Rate Sensor Circuit

ASC-ECU

G AND YAW 
RATE SENSOR

ACA02068

AC901112

Connector: A-02

A-02 (B)

AF

AC901076AU

Connector: C-26

C-26 (B)

DIAGNOSIS

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ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-208

CIRCUIT OPERATION

The G and yaw rate sensor outputs the signal to ASC-ECU via 
the special CAN bus lines.

.

DTC SET CONDITIONS

This DTC is set when the ASC-ECU cannot receive the signal 
from the G and yaw rate sensor although there is no abnormal-
ity in ASC-ECU supply voltage.

.

PROBABLE CAUSES

• Wiring harness or connector failure for the special CAN bus 

lines between ASC-ECU and the G and yaw rate sensor

• G and yaw rate sensor malfunction

• ASC-ECU malfunction

• Connector disconnected or improperly connected

• Stretched or broken wires

DIAGNOSIS

Required Special Tools:

• MB991958: Scan Tool (M.U.T.-III Sub Assembly)

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

• MB991827: M.U.T.-III USB Cable

• MB991910: M.U.T.-III Main Harness A

STEP 1. M.U.T.-III CAN bus diagnostics
Use scan tool to diagnose the CAN bus lines.
Q: Is the check result normal?

YES : Go to Step 3.
NO :  Repair the CAN bus lines (Refer to GROUP 54C 

− 

CAN Bus Diagnostics Table 

P.54C-17

). On 

completion, go to Step 2.

STEP 2. Diagnostic trouble code recheck after resetting 
CAN bus lines
Q: Is DTC U1003 set?

YES : Go to Step 3.
NO :  The procedure is complete.

STEP 3. Connector check: A-02 ASC-ECU connector, C-26 
G and yaw rate sensor connector
Q: Is the check result normal?

YES : Go to Step 4.
NO :  Repair the connector, and then go to Step 7.

DIAGNOSIS

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ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-209

STEP 4. Wiring harness check between A-02 ASC-ECU 
connector terminals No.18 and C-26 G and yaw rate sensor 
connector terminals No.3, and between A-02 ASC-ECU 
connector terminals No.19 and C-26 G and yaw rate sensor 
connector terminals No.2.
Check for open and short circuit in communication circuit
Q: Is the check result normal?

YES : Go to Step 5.
NO :  Repair the wiring harness, and then go to Step 7.

STEP 5. Check whether the DTC is reset.
Erase the DTC.
Q: Is DTC U1003 set?

YES : Replace the G and yaw rate sensor (Refer to 

P.35C-290

), and then go to Step 6.

NO :  The procedure is complete.

STEP 6. Check whether the DTC is reset.
Erase the DTC.
Q: Is DTC U1003 set?

YES : Replace the hydraulic unit (integrated with ASC-ECU) 

(Refer to 

P.35C-287

), and then go to Step 7.

NO :  The procedure is complete.

STEP 7. Check whether the DTC is reset.
Erase the DTC.
Q: Is DTC U1003 set?

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

DIAGNOSIS

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ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-210

DTC U1415: Variant coding not completed

CAUTION

• If there is any problem in the CAN bus lines, an incor-

rect diagnostic trouble code may be set. Prior to this 
diagnosis, diagnose the CAN bus lines (Refer to 
GROUP 54C 

− CAN Bus Line Diagnostic Flow 

P.54C-10

).

• Whenever ECU is replaced, ensure that the CAN bus 

lines are normal.

• When the diagnostic trouble code No.U1415 is set in 

ASC-ECU, the diagnostic trouble code may also be set 
in ETACS-ECU. When the diagnostic trouble code is set 
in ETACS-ECU, carry out the diagnosis of the diagnos-
tic trouble code for ETACS-ECU first.

• When the hydraulic unit (integrated with ASC-ECU) is 

replaced, always carry out the calibration of the steer-
ing wheel sensor, the G and yaw rate sensor and brake 
fluid pressure sensor (Refer to 

P.35C-282

, 

P.35C-283

 

and 

P.35C-284

).

.

CIRCUIT OPERATION

ASC-ECU receives the vehicle information stored in the 
ETACS-ECU via CAN bus lines.

.

DTC SET CONDITIONS

This diagnostic Trouble code is set when the variant coding for 
ETACS-ECU has not been completed.

.

PROBABLE CAUSES

• Variant coding for ETACS-ECU has not been implemented.

• ASC-ECU malfunction

DIAGNOSIS

Required Special Tools:

• MB991958: Scan Tool (M.U.T.-III Sub Assembly)

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

• MB991827: M.U.T.-III USB Cable

• MB991910: M.U.T.-III Main Harness A

STEP 1. Using scan tool MB991958, diagnose the CAN bus 
line.
Use scan tool to diagnose the CAN bus lines.
Q: Is the check result normal?

YES : Go to Step 2.
NO :  Repair the CAN bus lines (Refer to GROUP 54C 

− 

CAN Bus Diagnostics Table 

P.54C-17

). On 

completion, go to Step 4.