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DIAGNOSIS TSB Revision ACTIVE STABILITY CONTROL SYSTEM (ASC) 35C-137 DTC C121D: Abnormality in brake fluid pressure sensor circuit CAUTION • If there is any problem in the CAN bus lines, an incor- rect diagnostic trouble code may be set. Prior to this • Whenever the ECU is replaced, ensure that the CAN bus lines are normal. • When the hydraulic unit (integrated with ASC-ECU) is replaced, always perform the calibration of steering .) . CIRCUIT OPERATION The pressure sensor is incorporated in the hydraulic unit. When . DTC SET CONDITIONS If the pressure sensor output signal is outside the standard . PROBABLE CAUSES • Incorrect brake pedal height DIAGNOSIS Required Special Tools: • MB991958 Scan Tool (M.U.T.-III Sub Assembly) • MB991824: Vehicle Communication Interface (V.C.I.) • MB991997: ASC check harness STEP 1. Using scan tool MB991958, diagnose the CAN bus YES : Go to Step 3. Troubleshooting .) After repairing the CAN bus line, go to Step 2. |