DTC C1453: Shift Position Information Range/Performance

DTC detecting condition: 

A fault is detected if an abnormal value in the shift position data from the HEV or electric brake booster is received for the predetermined time.

Trouble symptom: 

• VDC does not operate.
• Hill hold does not function.
• 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 the 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. Turn the ignition switch to OFF.
   2. After turning the ignition switch to ON for approx. 10 seconds, turn it to OFF.
   3. Turn the ignition switch to ON again.
   4. Using the Subaru Select Monitor, perform the clear memory. Refer to COMMON (DIAG)>CLEAR MEMORY .
   5. Execute the inspection mode. Refer to BRAKE CONTROL (DIAGNOSTICS) (HEV)>INSPECTION MODE .
   6. 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.