DTC C1C6F: Accumulator Pressure Leak

DTC detecting condition: 

• Before braking and when the pump motor is being driven, accumulator pressure sensor input does not increase and this condition occurs the predetermined times or more.
• Before braking and when the pump motor is not driven, a dropping rate of accumulator pressure sensor input is larger than the specified value and this condition occurs the predetermined times or more.

Trouble symptom: 

Regenerative brake cannot be controlled.

1. CHECK BRAKE FLUID LEAKAGE  .

   Check the brake fluid lines between the brake booster assembly (with master cylinder) and the brake accumulator assembly for brake fluid leakage.

   Is the check result OK?

   Yes  : Go to  2.

   No  : Repair or replace the appropriate parts.

2. CHECK PUMP MOTOR DRIVE TIME  .
   1. Turn to READY ON.
   2. Wait for a while in the READY ON state, check ON/OFF operation of the pump motor.
      NOTE: The pump motor drive one or more time (OFF → ON) within 20 seconds, or duration of operation at a single time is for 10 seconds or more.

      Is the check result OK?

      Yes  : Go to  3.

      No  : Replace the brake booster assembly (with the master cylinder) and the brake accumulator assembly. Ref. to BRAKE>BRAKE BOOSTER . Ref. to BRAKE>BRAKE ACCUMULATOR ASSY . Go to  3.

3. CHECK DTC  .
   1. Using the Subaru Select Monitor, perform the clear memory of [Electric Brake Booster]. Ref. to COMMON (DIAG)>CLEAR MEMORY .
   2. Read the DTC of [Electric Brake Booster] using the Subaru Select Monitor. Ref. to ELECTRIC BRAKE BOOSTER (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

   Is DTC C1C6F displayed?

   Yes  : Replace the brake booster assembly (with the master cylinder) and the brake accumulator assembly. Ref. to BRAKE>BRAKE BOOSTER . Ref. to BRAKE>BRAKE ACCUMULATOR ASSY .

   No  : Currently, it is normal. There may have been a temporary poor contact in the harness and connector or a temporary noise interference.