DTC C1711: Steering Angle Sensor

DTC detecting condition: 

• A fault is detected if the sensor signal value is not correct.
• A fault is detected if the yaw rate sensor signal/lateral G sensor signal change while the sensor signal of steering angle sensor indicates a constant value.
• A fault is detected if the communication status of steering angle sensor is abnormal.

Trouble symptom: 

• ABS does not operate.
• VDC does not operate.
• Hill start assist does not operate. (Models without EyeSight)
• AVH does not function. (Models with EyeSight)
• EyeSight does not operate. (Models with EyeSight)

Wiring diagram: 

• Models without EyeSight

  Vehicle dynamics control system. Refer to WIRING SYSTEM>VEHICLE DYNAMICS CONTROL SYSTEM>WIRING DIAGRAM>WITHOUT EYESIGHT .

  Courtesy of SUBARU OF AMERICA, INC.

• Models with EyeSight

  Vehicle dynamics control system. Refer to WIRING SYSTEM>VEHICLE DYNAMICS CONTROL SYSTEM>WIRING DIAGRAM>WITH EYESIGHT .

  Courtesy of SUBARU OF AMERICA, INC.

1. CHECK POWER SUPPLY FOR STEERING ANGLE SENSOR. 
   1. Turn the ignition switch to OFF.
   2. Disconnect the connector from steering angle sensor.
   3. Turn the ignition switch to ON.
   4. Measure the voltage between steering angle sensor and chassis ground.

      Connector & terminal 

      (B231) No. 4 (+) - Chassis ground (-):

   Is the voltage 10 - 15 V?

   Yes:  Go to  2.

   No:  Repair the steering angle sensor power supply circuit including the fuse.

2. CHECK GROUND CIRCUIT OF STEERING ANGLE SENSOR (CHECK FOR OPEN CIRCUIT). 

   Measure the resistance between steering angle sensor and chassis ground.

   Connector & terminal 

   (B231) No. 1 - Chassis ground:

   Is the resistance less than 10 Ω?

   Yes:  Go to  3.

   No:  Repair ground circuit in the steering angle sensor.

3. CHECK STEERING ANGLE SENSOR HARNESS (CHECK FOR OPEN CIRCUIT). 
   1. Disconnect the connector from the VDC Control Module & H/U.
   2. Measure the resistance between VDC Control Module & H/U and steering angel sensor.

      Connector & terminal 

      Models without EyeSight 

      (B231) No. 2 - (B310) No. 10:

      (B231) No. 3 - (B310) No. 11:

      Models with EyeSight 

      (B231) No. 2 - (B310) No. 43:

      (B231) No. 3 - (B310) No. 42:

   Is the resistance less than 1 Ω?

   Yes:  Go to  4.

   No:  Repair the harness between the steering angle sensor and VDC Control Module & H/U.

4. CHECK GROUND SHORT CIRCUIT OF STEERING ANGLE SENSOR HARNESS. 

   Measure the resistance between steering angle sensor and chassis ground.

   Connector & terminal 

   (B231) No. 2 - Chassis ground:

   (B231) No. 3 - Chassis ground:

   Is the resistance 10 Ω or more?

   Yes:  Go to  5.

   No:  Repair the harness between the steering angle sensor and VDC Control Module & H/U.

5. CHECK STEERING WHEEL. 
   1. Drive the vehicle on a flat road.
   2. Park the vehicle straight.
   3. Check the steering wheel for deviation from center.

   Is the deviation from the center of steering wheel less than 5°?

   Yes:  Go to  6.

   No:  Perform the centering adjustment of steering wheel, and perform the VDC sensor midpoint setting mode. Refer to VEHICLE DYNAMICS CONTROL (VDC)>VDC CONTROL MODULE AND HYDRAULIC CONTROL UNIT (VDC Control Module & H/U)>ADJUSTMENT>VDC SENSOR MIDPOINT SETTING MODE .

6. CHECK OUTPUT OF STEERING ANGLE SENSOR USING SUBARU SELECT MONITOR. 
   1. Adjust steering wheel to the center position.
   2. Using the Subaru Select Monitor, select "Data monitor". Refer to VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)>SUBARU SELECT MONITOR>OPERATION>READ CURRENT DATA .
   3. Read the «Steering Angle Sensor» displayed on display.

   Is the reading of «Steering Angle Sensor»-10°- 10°?

   Yes:  Perform the VDC sensor midpoint setting mode. Refer to VEHICLE DYNAMICS CONTROL (VDC)>VDC CONTROL MODULE AND HYDRAULIC CONTROL UNIT (VDC Control Module & H/U)>ADJUSTMENT>VDC SENSOR MIDPOINT SETTING MODE . Go to  7.

   No:  Check the installation of the steering wheel and steering angle sensor.

7. CHECK STEERING ANGLE SENSOR USING SUBARU SELECT MONITOR. 
   1. Turn the ignition switch to OFF.
   2. Connect all connectors.
   3. Perform the Clear Memory Mode. Refer to VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)>CLEAR MEMORY MODE .
   4. Perform the Inspection Mode. Refer to VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)>INSPECTION MODE .
   5. Read the DTC. Refer to VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)>READ DIAGNOSTIC TROUBLE CODE (DTC) .

   Is the same DTC displayed?

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

   No:  Go to  8.

8. CHECK DETECTION OF OTHER DTCS FOR VDC. 

   Refer to VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)>READ DIAGNOSTIC TROUBLE CODE (DTC) .

   Is any other DTC displayed?

   Yes:  Perform the diagnosis according to DTC. Refer to VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)>LIST OF DIAGNOSTIC TROUBLE CODE (DTC) .

   No:  Currently, it is normal. There may have been a temporary poor contact in the harness and connector or a temporary noise interference.