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.
VSC (VDC) does not operate.
EyeSight does not operate.

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 after diagnosis if a DTC is recorded. Ref. to COMMON (DIAGNOSTICS)>CLEAR MEMORY .

Wiring diagram:

Vehicle stability control system Ref. to WIRING SYSTEM>VEHICLE STABILITY CONTROL SYSTEM .

Courtesy of SUBARU OF AMERICA, INC.

Courtesy of SUBARU OF AMERICA, INC.

CHECK POOR CONTACT OF CONNECTOR .
Check if there is poor contact between VSC (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 VSC (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 (B66) from the VSC (VDC) Control Module & H/U.
3. Disconnect the connector from ABS wheel speed sensor.
4. Measure the resistance between VSC (VDC) Control Module & H/U connector and ABS wheel speed sensor connector.
  Connector & terminal
  
  DTC C1211
  
  (B66) No. 4 - (B96) No. 1:
  
  (B66) No. 16 - (B96) No. 2:
  
  DTC C1221
  
  (B66) No. 8 - (B97) No. 1:
  
  (B66) No. 19 - (B97) No. 2:
  
  DTC C1231
  
  (B66) No. 29 - (R108) No. 1:
  
  (B66) No. 17 - (R108) No. 2:
  
  DTC C1241
  
  (B66) No. 18 - (L108) No. 1:
  
  (B66) No. 31 - (L108) No. 2:
Is the resistance less than 1 Ω?

Yes: Go to 3.

No: Repair the harness connector between VSC (VDC) Control Module & H/U and ABS wheel speed sensor.
CHECK GROUND SHORT OF HARNESS .
Measure the resistance between VSC (VDC) Control Module & H/U connector and chassis ground.

Connector & terminal

DTC C1211

(B66) No. 4 - Chassis ground:

DTC C1221

(B66) No. 8 - Chassis ground:

DTC C1231

(B66) No. 29 - Chassis ground:

DTC C1241

(B66) No. 18 - Chassis ground:

Is the resistance 1 MΩ or more?

Yes: Go to 4.

No: Repair the harness connector between VSC (VDC) Control Module & H/U and ABS wheel speed sensor.
CHECK ABS WHEEL SPEED SENSOR POWER SUPPLY CIRCUIT .
1. Connect the VSC (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
  
  (B96) No. 2 (+) - Chassis ground (-):
  
  DTC C1221
  
  (B97) No. 2 (+) - Chassis ground (-):
  
  DTC C1231
  
  (R108) No. 2 (+) - Chassis ground (-):
  
  DTC C1241
  
  (L108) No. 2 (+) - Chassis ground (-):
Is the voltage 5 - 16 V?

Yes: Go to 6.

No: Go to 5.
CHECK VSC (VDC) CONTROL MODULE & H/U POWER SUPPLY CIRCUIT .
1. Turn the ignition switch to OFF.
2. Disconnect the VSC (VDC) Control Module & H/U connector.
3. Turn the ignition switch to ON.
4. Measure the voltage between VSC (VDC) Control Module & H/U connector terminals.
  Connector & terminal
  
  (B66) No. 1 (+) - (B66) No. 13 (-):
  
  (B66) No. 25 (+) - (B66) No. 38 (-):
  
  (B66) No. 28 (+) - (B66) No. 38 (-):
Is the voltage 10 - 15 V?

Yes: Go to 6.

No: Check the generator, battery and VSC (VDC) Control Module & H/U power supply circuit.
CHECK ABS WHEEL SPEED SENSOR .
Check the ABS wheel speed sensor. Ref. to VEHICLE STABILITY CONTROL>FRONT ABS WHEEL SPEED SENSOR>INSPECTION . Ref. to VEHICLE STABILITY CONTROL>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 STABILITY CONTROL>FRONT ABS WHEEL SPEED SENSOR . Ref. to VEHICLE STABILITY CONTROL>REAR ABS WHEEL SPEED SENSOR .
CHECK VSC (VDC) CONTROL MODULE & H/U .
1. Connect all connectors.
2. Using the Subaru Select Monitor, perform the clear memory of [Brake Control]. Ref. to COMMON (DIAGNOSTICS)>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 VSC (VDC) Control Module & H/U. Ref. to VEHICLE STABILITY CONTROL>VSC (VDC) CONTROL MODULE AND HYDRAULIC CONTROL UNIT (VSCCM & H/U) .

No: Go to 8.
CHECK DETECTION OF OTHER DTCS FOR VSC (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.