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DIAGNOSIS TSB Revision ACTIVE STABILITY CONTROL SYSTEM (ASC) 35C-183 DTC C121A: Abnormality in steering wheel sensor initialization CAUTION • If there is any problem in the CAN bus lines, an incor- rect diagnostic trouble code may be set. Prior to this − CAN Bus Line Diagnostic Flow • Whenever ECU is replaced, ensure that the CAN bus lines are normal. • When the steering wheel sensor is replaced, always carry out calibration to make ASC-ECU learn the neu- ). • When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steer-
and . OPERATION Steering wheel sensor stores the neutral position learned by . DTC SET CONDITIONS This diagnostic trouble code is set when ASC-ECU detects that . PROBABLE CAUSES • Steering wheel sensor malfunction • ASC-ECU malfunction • Neutral position of steering wheel sensor not learned DIAGNOSIS Required Special Tools: • MB991958: Scan Tool (M.U.T.-III Sub Assembly) • MB991824: Vehicle Communication Interface (V.C.I.) • MB991827: M.U.T.-III USB Cable • MB991910: M.U.T.-III Main Harness A STEP 1. Using scan tool MB991958, diagnose the CAN bus YES : Go to Step 3. − CAN Bus Diagnostics Table ). On completion, go to Step 2. |