DTC C1241 Rear Left Abs Sensor Circuit: Wiring diagram

Vehicle dynamics control system Ref. to WIRING SYSTEM>Vehicle Dynamics Control System .

Fig 1: VDC System Wiring Diagram (Rear Left ABS Sensor Circuit) - 1 Of 2

Courtesy of SUBARU OF AMERICA, INC.

Fig 2: VDC System Wiring Diagram (Rear Left ABS Sensor Circuit) - 2 Of 2

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 & terminal 

      DTC C1211

      (B310) No. 29 - (B6) No. 1:

      (B310) No. 17 - (B6) No. 2:

      DTC C1221 

      (B310) No. 33 - (B15) No. 1: (model without EyeSight)

      (B310) No. 8 - (B15) No. 1: (model with EyeSight)

      (B310) No. 20 - (B15) No. 2:

      DTC C1231 

      (B310) No. 5 - (R72) No. 1:

      (B310) No. 18 - (R72) No. 2:

      DTC C1241 

      (B310) No. 19 - (R73) No. 1:

      (B310) No. 7 - (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 & terminal 

   DTC C1211 

   (B310) No. 29 - Chassis ground:

   DTC C1221 

   (B310) No. 33 - Chassis ground: (model without EyeSight)

   (B310) No. 8 - Chassis ground: (model with EyeSight)

   DTC C1231 

   (B310) No. 5 - Chassis ground:

   DTC C1241 

   (B310) No. 19 - 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 & terminal 

      DTC C1211 

      (B6) No. 2 (+) - Chassis ground (-):

      DTC C1221 

      (B15) No. 2 (+) - 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 & terminal 

      (B310) No. 4 (+) - (B310) No. 14 (-):

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

      (B310) No. 26 (+) - (B310) No. 14 (-):

   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 SIGNAL. 
   1. Prepare an oscilloscope.
   2. Check the ABS wheel speed sensor. Ref. to VEHICLE DYNAMICS CONTROL (VDC)>Front ABS Wheel Speed Sensor>INSPECTION>CHECK ABS WHEEL SPEED SENSOR UNIT . Ref. to VEHICLE DYNAMICS CONTROL (VDC)>Rear ABS Wheel Speed Sensor>INSPECTION>CHECK ABS WHEEL SPEED SENSOR UNIT .

   Is the pattern the same waveform as shown in the figure?

   • 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. Clear the memory. Ref. to BRAKE CONTROL (DIAGNOSTICS)>Clear memory .
   3. Perform the Inspection Mode. Ref. to BRAKE CONTROL (DIAGNOSTICS)>Inspection Mode .
   4. Read the DTC. Ref. to BRAKE CONTROL (DIAGNOSTICS)>Read Diagnostic Trouble Code (DTC) .

   Is the same DTC displayed?

   • Yes  : Replace the VDCCM only. Ref. to VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)>REPLACEMENT .
   • No  : Go to 8. 
8. CHECK DETECTION OF OTHER DTCS FOR VDC. 

   Ref. to BRAKE CONTROL (DIAGNOSTICS)>Read Diagnostic Trouble Code (DTC) .

   Is any other DTC displayed?

   • Yes  : Perform the diagnosis according to DTC. Ref. to BRAKE CONTROL (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.