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

NOTE: This DTC may be stored when the wheel speed sensor connector is disconnected regardless of the ignition switch condition (ON/OFF). Perform the Clear Memory Mode after diagnosis if a DTC is recorded. Refer to VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)>CLEAR MEMORY MODE .

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.

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.

Courtesy of SUBARU OF AMERICA, INC.

CHECK POOR CONTACT OF CONNECTOR.
Check if there is poor contact between VDC Control Module & H/U and ABS wheel speed sensor.

Is there poor contact?

Yes: Repair the connector.

No: Go to 2.
CHECK HARNESS CONNECTOR BETWEEN VDC Control Module & 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
  
  Models without EyeSight
  
  DTC C1211
  
  (B310) No. 27 - (B6) No. 1:
  
  (B310) No. 26 - (B6) No. 2:
  
  DTC C1221
  
  (B310) No. 36 - (B15) No. 1:
  
  (B310) No. 37 - (B15) No. 2:
  
  DTC C1231
  
  (B310) No. 34 - (R72) No. 1:
  
  (B310) No. 33 - (R72) No. 2:
  
  DTC C1241
  
  (B310) No. 29 - (R73) No. 1:
  
  (B310) No. 30 - (R73) No. 2:
  
  Models with EyeSight
  
  DTC C1211
  
  (B310) No. 5 - (B6) No. 1:
  
  (B310) No. 4 - (B6) No. 2:
  
  DTC C1221
  
  (B310) No. 9 - (B15) No. 1:
  
  (B310) No. 8 - (B15) No. 2:
  
  DTC C1231
  
  (B310) No. 11 - (R72) No. 1:
  
  (B310) No. 10 - (R72) No. 2:
  
  DTC C1241
  
  (B310) No. 7 - (R73) No. 1:
  
  (B310) No. 6 - (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.
CHECK GROUND SHORT OF HARNESS.
Measure the resistance between VDC Control Module & H/U connector and chassis ground.

Connector & terminal

Models without EyeSight

DTC C1211

(B310) No. 26 - Chassis ground:

DTC C1221

(B310) No. 37 - Chassis ground:

DTC C1231

(B310) No. 33 - Chassis ground:

DTC C1241

(B310) No. 30 - Chassis ground:

Models with EyeSight

DTC C1211

(B310) No. 4 - Chassis ground:

DTC C1221

(B310) No. 8 - Chassis ground:

DTC C1231

(B310) No. 10 - Chassis ground:

DTC C1241

(B310) No. 6 - Chassis ground:

Is the resistance 1 Ω or more?

Yes: Go to 4.

No: Repair the harness connector between VDC Control Module & H/U and ABS wheel speed sensor.
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. 1 (+) - Chassis ground (-):
  
  DTC C1241
  
  (R73) No. 1 (+) - Chassis ground (-):
Is the voltage 5 - 16 V?

Yes: Go to 6.

No: Go to 5.
CHECK VDC Control Module & 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
  
  Models without EyeSight
  
  (B310) No. 1 (+) - (B310) No. 13 (-):
  
  (B310) No. 6 (+) - (B310) No. 13 (-):
  
  (B310) No. 25 (+) - (B310) No. 13 (-):
  
  Models with EyeSight
  
  (B310) No. 1 (+) - (B310) No. 14 (-):
  
  (B310) No. 30 (+) - (B310) No. 14 (-):
  
  (B310) No. 35 (+) - (B310) No. 14 (-):
Is the voltage 10 - 15 V?

Yes: Go to 6.

No: Check the generator, battery and VDC Control Module & H/U power supply circuit.
CHECK ABS WHEEL SPEED SENSOR SIGNAL.
1. Prepare an oscilloscope.
2. Check the ABS wheel speed sensor. Refer to VEHICLE DYNAMICS CONTROL (VDC)>FRONT ABS WHEEL SPEED SENSOR>INSPECTION>CHECK ABS WHEEL SPEED SENSOR UNIT . Refer 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. Refer to VEHICLE DYNAMICS CONTROL (VDC)>FRONT ABS WHEEL SPEED SENSOR . Refer to VEHICLE DYNAMICS CONTROL (VDC)>REAR ABS WHEEL SPEED SENSOR .
CHECK VDC Control Module & H/U.
1. Connect all connectors.
2. Perform the Clear Memory Mode. Refer to VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)>CLEAR MEMORY MODE .
3. Perform the Inspection Mode. Refer to VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)>INSPECTION MODE .
4. Read the DTC. Refer to VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)>READ DIAGNOSTIC TROUBLE CODE (DTC) .
Is the same DTC displayed?

Yes: Replace the VDC Control Module & H/U. Refer to VEHICLE DYNAMICS CONTROL (VDC)>VDC CONTROL MODULE AND HYDRAULIC CONTROL UNIT (VDC Control Module & H/U) .

No: Go to 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.