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 VDCCM&H/U.
   3. Disconnect the connector from ABS wheel speed sensor.
   4. Measure the resistance between VDCCM&H/U connector and ABS wheel speed sensor connector.

      Connector and 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 VDCCM&H/U and ABS wheel speed sensor.

3. CHECK GROUND SHORT OF HARNESS  .

   Measure the resistance between VDCCM&H/U connector and chassis ground.

   Connector and 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 VDCCM&H/U and ABS wheel speed sensor.

4. CHECK ABS WHEEL SPEED SENSOR POWER SUPPLY CIRCUIT  .
   1. Connect the VDCCM&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 and 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 VDCCM&H/U connector.
   3. Turn the ignition switch to ON.
   4. Measure the voltage between VDCCM&H/U connector terminals.

      Connector and 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 VDCCM&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 (DIAG)>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 VDCCM&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.