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.

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.

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. Ref. to COMMON (DIAG)>CLEAR MEMORY .

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

Is there poor contact?

Yes: Repair the connector.

No: Go to 2 .
CHECK HARNESS CONNECTOR BETWEEN VDCCM AND H/U AND ABS WHEEL SPEED SENSOR (CHECK FOR OPEN CIRCUIT) .
1. Turn the ignition switch to OFF.
2. Disconnect the connector (B66) from the VDCCM and H/U.
3. Disconnect the connector from ABS wheel speed sensor.
4. Measure the resistance between VDCCM and H/U connector and ABS wheel speed sensor connector.
  Connector and terminal
  
  DTC C1211
  
  (B66) No. 21 - (B96) No. 1:
  
  (B66) No. 26 - (B96) No. 2:
  
  DTC C1221
  
  (B66) No. 24 - (B97) No. 1:
  
  (B66) No. 7 - (B97) No. 2:
  
  DTC C1231
  
  (B66) No. 22 - (L61) No. 4:
  
  (B66) No. 37 - (L61) No. 3:
  
  DTC C1241
  
  (B66) No. 39 - (L62) No. 4:
  
  (B66) No. 23 - (L62) No. 3:
Is the resistance less than 1 Ω?

Yes: Go to 3 .

No: Repair the harness connector between VDCCM and H/U and ABS wheel speed sensor.
CHECK GROUND SHORT OF HARNESS .
Measure the resistance between VDCCM and H/U connector and chassis ground.

Connector and terminal

DTC C1211

(B66) No. 26 - Chassis ground:

DTC C1221

(B66) No. 7 - Chassis ground:

DTC C1231

(B66) No. 37 - Chassis ground:

DTC C1241

(B66) No. 23 - Chassis ground:

Is the resistance 1 MΩ or more?

Yes: Go to 4 .

No: Repair the harness connector between VDCCM and H/U and ABS wheel speed sensor.
CHECK ABS WHEEL SPEED SENSOR POWER SUPPLY CIRCUIT .
1. Connect the VDCCM and 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
  
  (B96) No. 1 (+) - Chassis ground (-):
  
  DTC C1221
  
  (B97) No. 1 (+) - Chassis ground (-):
  
  DTC C1231
  
  (L61) No. 4 (+) - Chassis ground (-):
  
  DTC C1241
  
  (L62) No. 4 (+) - Chassis ground (-):
Is the voltage 5 - 16 V?

Yes: Go to 6 .

No: Go to 5 .
CHECK VDCCM AND H/U POWER SUPPLY CIRCUIT .
1. Turn the ignition switch to OFF.
2. Disconnect the VDCCM and H/U connector.
3. Turn the ignition switch to ON.
4. Measure the voltage between VDCCM and H/U connector terminals.
  Connector and terminal
  
  (B66) No. 1 (+) - (B66) No. 14 (-):
  
  (B66) No. 30 (+) - (B66) No. 46 (-):
  
  (B66) No. 36 (+) - (B66) No. 46 (-):
Is the voltage 10 - 15 V?

Yes: Go to 6 .

No: Check the generator, battery and VDCCM and H/U power supply circuit.
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 .
CHECK VDCCM AND H/U .
1. Connect all connectors.
2. Using the Subaru Select Monitor, perform the clear memory of [Brake Control]. Ref. to COMMON (DIAG)>CLEAR MEMORY .
3. Execute the inspection mode. Ref. to BRAKE CONTROL (DIAGNOSTICS)>INSPECTION MODE .
4. Read the DTC of [Brake Control] using the Subaru Select Monitor. Ref. to BRAKE CONTROL (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .
Is the same DTC displayed?

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

No: Go to 8 .
CHECK DETECTION OF OTHER DTCS FOR VDC .
Read the DTC of [Brake Control] using the Subaru Select Monitor. Ref. to BRAKE CONTROL (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

Is any other DTC displayed?

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

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