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Home >> Subaru >> 2021 >> Crosstrek Base, Standard Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 8 (Brake Control System (Diagnostics) (HEV)) >> Diagnostic Procedure With Diagnostic Trouble Code (DTC) >> DTC C1454: Power Unit Torque Control Inhibit

DTC C1454: Power Unit Torque Control Inhibit

WARNING: This page is about a different variant/trim than selected.

DTC Detecting condition: 

A fault is detected if the torque coordinated control prohibit flag is received from the HEV or electric brake booster.

Trouble symptom: 

VDC does not operate.

NOTE: The warning light turns off when the power module torque down control prohibit flag returns to normal  .
  1. CHECK VDC CONTROL MODULE  .
    1. Turn READY ON and start the HEV.
    2. Using the Subaru Select Monitor, read data of [Power Unit Torque Down Control Stop Flag] in the [Data Monitor] of [Brake Control]. Ref. to BRAKE CONTROL (DIAGNOSTICS) (HEV)>DATA MONITOR .

    Is the [Power Unit Torque Down Control Stop Flag] set to [ON]?

    Yes:  Go to  4.

    No:  Go to  2.

  2. CHECK WARNING LIGHT  .

    Check whether the VDC warning light illuminates after driving for 1 minute or more at a speed of 10 km/h (6 MPH) or more.

    Does the VDC warning light illuminate?

    Yes:  Go to  3.

    No:  VDC is normal. Clear the memory. Ref. to COMMON (DIAG)>CLEAR MEMORY .

    NOTE: DTC may be recorded if cranking is performed during driving  .
  3. CHECK POOR CONTACT OF CONNECTORS  .

    Is there poor contact of hybrid vehicle control ECM connector or electric brake booster connector?

    Yes:  Repair the connector.

    No:  Go to  4.

  4. CHECK HYBRID VEHICLE CONTROL ECM DTC  .

    Read the DTC of [P-HEV Hybrid Powertrain Control] using the Subaru Select Monitor. Ref. to P-HEV HYBRID POWERTRAIN CONTROL (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

    Are any DTCs displayed?

    Yes:  Perform the diagnosis according to the DTC. Ref. to P-HEV HYBRID POWERTRAIN CONTROL (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC)>LIST .

    No:  Go to  5.

  5. CHECK ELECTRIC BRAKE BOOSTER DTC  .

    Read the DTC of [Electric Brake Booster] using the Subaru Select Monitor. Ref. to ELECTRIC BRAKE BOOSTER (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

    Are any DTCs displayed?

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

    No:  Go to  6.

  6. 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) (HEV)>INSPECTION MODE .
    4. Read the DTC of [Brake Control] using the Subaru Select Monitor. Ref. to BRAKE CONTROL (DIAGNOSTICS) (HEV)>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 & H/U) .

    No:  Go to  7.

  7. CHECK DETECTION OF OTHER DTCS FOR VDC  .

    Read the DTC of [Brake Control] using the Subaru Select Monitor. Ref. to BRAKE CONTROL (DIAGNOSTICS) (HEV)>DIAGNOSTIC TROUBLE CODE (DTC) .

    Is any other DTC displayed?

    Yes:  Perform the diagnosis according to the DTC. Ref. to BRAKE CONTROL (DIAGNOSTICS) (HEV)>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.

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