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NO: Adjust the brake pedal, and then go to Step 3. STEP 3. Brake booster check Q:Is the check result normal? YES: Go to Step 4. NO: Replace the brake booster. STEP 4. Check whether the diagnostic trouble code is reset. Q:Is DTC C121D set? YES: Replace the ASC-ECU. NO: The procedure is complete. DTC C121E: Abnormality in brake fluid pressure sensor output signal M13506100046USA0000010000 Stoplight Switch Circuit ETACS-ECU STOPLIGHT · SHIFT LOCK MECHANISM ⦆ If there is any problem in the CAN bus lines, an incorrect ⦆ Whenever ECU is replaced, ensure that the CAN bus lines ACTIVE SKID CONTROL SYSTEM (ASC) 35C-107 DIAGNOSIS |