DTC C1455: Power Unit Torque Range/Performance

DTC detecting condition: 

A fault is detected if an abnormal value in a torque-related signal from the HEV or electric brake booster is received for the predetermined time.

Trouble symptom: 

• VDC does not operate.
• EyeSight does not operate. (Models with EyeSight)
• Electric parking brake function does not operate.

1. CHECK HYBRID VEHICLE CONTROL ECM. 
   1. Start the engine.
   2. Read the DTC of [P-HEV Hybrid Powertrain Control] using the Subaru Select Monitor. Refer to P-HEV HYBRID POWERTRAIN CONTROL (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

   Are any DTCs displayed?

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

   No:  Go to  2.

2. CHECK ELECTRIC BRAKE BOOSTER. 
   1. Start the engine.
   2. Read the DTC of [Electric Brake Booster] using the Subaru Select Monitor. Refer to ELECTRIC BRAKE BOOSTER (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

   Are any DTCs displayed?

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

   No:  Go to  3.

3. CHECK VDCCM & H/U. 
   1. Using the Subaru Select Monitor, perform the clear memory. Refer to COMMON (DIAG)>CLEAR MEMORY .
   2. Execute the inspection mode. Refer to BRAKE CONTROL (DIAGNOSTICS) (HEV)>INSPECTION MODE .
   3. Read the DTC using Subaru Select Monitor. Refer to BRAKE CONTROL (DIAGNOSTICS) (HEV)>DIAGNOSTIC TROUBLE CODE (DTC) .

   Is the same DTC displayed?

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

   No:  Go to  4.

4. CHECK DETECTION OF OTHER DTCS FOR VDC. 

   Read the DTC using Subaru Select Monitor. Refer to BRAKE CONTROL (DIAGNOSTICS) (HEV)>DIAGNOSTIC TROUBLE CODE (DTC) .

   Is any other DTC displayed?

   Yes:  Perform the diagnosis according to DTC. Refer 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.