DTC U0126: Lost Communication With Steering Angle Sensor Module

DTC detecting condition: 

No data is received from steering angle sensor.

Trouble symptom: 

VDC CONTROL MODULE does not operate normally.

1. CHECK CAN COMMUNICATION HARNESS  .

   Perform the basic diagnostic procedure to check for fault in CAN communication harness. Ref. to LAN SYSTEM (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE .

   Was the basic diagnostic procedure performed up to step 7?

   Yes:  Go to  2.

   No:  Perform the basic diagnostic procedure. Ref. to LAN SYSTEM (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE .

2. CHECK DTC (OTHER THAN U-CODE)  .

   Check the displayed DTC.

   Is DTC other than U*** displayed? (Current malfunction)

   Yes:  Perform the diagnosis for DTCs other than the displayed U-code.

   No:  Go to  3.

3. CHECK DTC  .

   Check the displayed DTC.

   Is DTC U0126 displayed? (Current malfunction)

   Yes:  Go to  4.

   No:  Go to  6.

4. CHECK DTC  .
   1. Check CAN communication circuit. Ref. to LAN SYSTEM (DIAGNOSTICS)>CAN COMMUNICATION CIRCUIT CHECK .
   2. Using the Subaru Select Monitor, read all DTCs. Ref. to LAN SYSTEM (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)>OPERATION .

      DTC Check 

   Is DTC U0126 displayed? (Current malfunction)

   Yes:  Go to  5.

   No:  Go to  6.

5. CHECK DTC  .

   Using the Subaru Select Monitor, read DTC of all the systems. Ref. to LAN SYSTEM (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)>OPERATION .

   DTC Check 

   Is DTC U0126 detected in several modules? (Current malfunction)

   Yes:  Replace the steering angle sensor. Ref. to VEHICLE DYNAMICS CONTROL (VDC)>STEERING ANGLE SENSOR .

   No:  Replace the module that the DTC has been detected.

6. CHECK HARNESS  .
   1. Shake the harness, and check for poor contact.
   2. Using the Subaru Select Monitor, read all DTCs. Ref. to LAN SYSTEM (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)>OPERATION .

      DTC Check 

   Is DTC U0126 displayed? (Current malfunction)

   Yes:  Repair the poor contact of harness, or replace the harness.

   No:  Go to  7.

7. CHECK CONNECTOR  .

   Check the connector used for high speed CAN for poor contact.

   Is there poor contact of connector?

   Yes:  Repair the connector that has poor contact, or replace harness.

   No:  It is possible that temporary poor communication occurs. Delete the DTC.