DTC C1241: Rear Left Abs Sensor Circuit

DTC detecting condition: 

Judge as malfunction when the current value of the wheel speed sensor is out of normal range for a predetermined time or more.

Trouble symptom: 

• ABS does not operate.
• VDC does not operate.
• AVH does not function.
• EyeSight does not operate. (Models with EyeSight)

Wiring diagram: 

Vehicle dynamics control system Ref. to WIRING SYSTEM>VEHICLE DYNAMICS CONTROL SYSTEM .

Courtesy of SUBARU OF AMERICA, INC.

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK POOR CONTACT OF CONNECTOR  .

   Check if there is poor contact between VDCCM & H/U and ABS wheel speed sensor.

   Is there poor contact?

   Yes  : Repair the connector.

   No  : Go to  2.

2. CHECK HARNESS CONNECTOR BETWEEN VDCCM & H/U AND ABS WHEEL SPEED SENSOR (CHECK FOR OPEN CIRCUIT)  .
   1. Turn the ignition switch to OFF.
   2. Disconnect the connector (B310) from the VDC control module & H/U.
   3. Disconnect the connector from ABS wheel speed sensor.
   4. Measure the resistance between VDC control module & H/U connector and ABS wheel speed sensor connector.

   Connector & terminal 

   DTC C1211 

   (B310) No. 21 - (B6) No. 1:

   (B310) No. 26 - (B6) No. 2:

   DTC C1221 

   (B310) No. 24 - (B15) No. 1:

   (B310) No. 7 - (B15) No. 2:

   DTC C1231 

   (B310) No. 37 - (R72) No. 1:

   (B310) No. 22 - (R72) No. 2:

   DTC C1241 

   (B310) No. 23 - (R73) No. 1:

   (B310) No. 39 - (R73) No. 2:

   Is the resistance less than 1 Ω?

   Yes  : Go to  3.

   No  : Repair the harness connector between VDC control module & H/U and ABS wheel speed sensor.

3. CHECK GROUND SHORT OF HARNESS  .

   Measure the resistance between VDC control module & H/U connector and chassis ground.

   Connector & terminal 

   DTC C1211 

   (B310) No. 26 - Chassis ground:

   DTC C1221 

   (B310) No. 7 - Chassis ground:

   DTC C1231 

   (B310) No. 37 - Chassis ground:

   DTC C1241 

   (B310) No. 23 - Chassis ground:

   Is the resistance 1 MΩ or more?

   Yes  : Go to  4.

   No  : Repair the harness connector between VDC control module & H/U and ABS wheel speed sensor.

4. CHECK ABS WHEEL SPEED SENSOR POWER SUPPLY CIRCUIT  .
   1. Connect the VDC control module & H/U connector.
   2. Connect the ABS wheel speed sensor connector.
   3. Turn the ignition switch to ON.
   4. Measure the voltage between ABS wheel speed sensor connector and chassis ground.

   Connector & terminal 

   DTC C1211 

   (B6) No. 1 (+) - Chassis ground (-):

   DTC C1221 

   (B15) No. 1 (+) - Chassis ground (-):

   DTC C1231 

   (R72) No. 2 (+) - Chassis ground (-):

   DTC C1241 

   (R73) No. 2 (+) - Chassis ground (-):

   Is the voltage 5 - 16 V?

   Yes  : Go to  6.

   No  : Go to  5.

5. CHECK VDCCM & H/U POWER SUPPLY CIRCUIT  .
   1. Turn the ignition switch to OFF.
   2. Disconnect the VDC control module & H/U connector.
   3. Turn the ignition switch to ON.
   4. Measure the voltage between VDC control module & H/U connector terminals.

   Connector & terminal 

   (B310) No. 1 (+) - (B310) No. 14 (-):

   (B310) No. 30 (+) - (B310) No. 46 (-):

   (B310) No. 36 (+) - (B310) No. 46 (-):

   Is the voltage 10 - 15 V?

   Yes  : Go to  6.

   No  : Check the generator, battery and VDC control module & H/U power supply circuit.

6. CHECK ABS WHEEL SPEED SENSOR  .

   Check the ABS wheel speed sensor. Ref. to VEHICLE DYNAMICS CONTROL (VDC)>FRONT ABS WHEEL SPEED SENSOR>INSPECTION . Ref. to VEHICLE DYNAMICS CONTROL (VDC)>REAR ABS WHEEL SPEED SENSOR>INSPECTION .

   Is the check result OK?

   Yes  : Go to  7.

   No  : Replace the ABS wheel speed sensor. Ref. to VEHICLE DYNAMICS CONTROL (VDC)>FRONT ABS WHEEL SPEED SENSOR . Ref. to VEHICLE DYNAMICS CONTROL (VDC)>REAR ABS WHEEL SPEED SENSOR .

7. CHECK VDCCM & H/U  .
   1. Connect all connectors.
   2. Using the Subaru Select Monitor, perform the clear memory. Ref. to COMMON (DIAGNOSTICS)>CLEAR MEMORY .
   3. Execute the inspection mode. Ref. to BRAKE CONTROL (DIAGNOSTICS)>INSPECTION MODE .
   4. Read the DTC using Subaru Select Monitor. Ref. to BRAKE CONTROL (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

   Is the same DTC displayed?

   Yes  : Replace the VDC control module & H/U. Ref. to VEHICLE DYNAMICS CONTROL (VDC)>VDC CONTROL MODULE AND HYDRAULIC CONTROL UNIT (VDCCM & H/U) .

   No  : Go to  8.

8. CHECK DETECTION OF OTHER DTCS FOR VDC  .

   Read the DTC using Subaru Select Monitor. Ref. to BRAKE CONTROL (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

   Is any other DTC displayed?

   Yes  : Perform the diagnosis according to DTC. Ref. to BRAKE CONTROL (DIAGNOSTICS)>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.