DTC C1241: Rear Left Abs Sensor Circuit

DTC detecting condition:

Judge as malfunction when the current value of the ABS 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 ABS 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&H/U and ABS wheel speed sensor.

Is there poor contact?

Yes: Repair the connector.

No: Go to 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. 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. 10 - (R72) No. 1:
  
  (B310) No. 11 - (R72) No. 2:
  
  DTC C1241
  
  (B310) No. 6 - (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.
CHECK GROUND SHORT OF HARNESS .
Measure the resistance between VDCCM&H/U connector and chassis ground.

Connector & terminal

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 MΩ or more?

Yes: Go to 4.

No: Repair the harness connector between VDCCM&H/U and ABS wheel speed sensor.
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. 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.
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. 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 VDCCM&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&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.
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 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.