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DIAGNOSIS TSB Revision ACTIVE STABILITY CONTROL SYSTEM (ASC) 35C-127 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 hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steer-
and . CIRCUIT OPERATION • ASC-ECU contains the power supply circuit (terminal No.1) for the pump motor. The pump motor is energized by the • The pump motor switch, which is incorporated in ASC-ECU, is always off unless the motor and solenoid valve check is • ASC-ECU activates the pump motor by turning on the ECU built-in pump motor switch. . DTC SET CONDITIONS This diagnostic trouble codes will be set under the cases • When the power supply voltage of the pump motor, which is not in operation, is abnormally low for a prolonged period • When the power supply voltage of the pump motor, which is not in operation, is abnormally high for a prolonged period . PROBABLE CAUSES Current trouble • Fusible link malfunction • Damaged wiring harness and connectors • Abnormality in battery or generator • ASC-ECU malfunction Past trouble • Carry out diagnosis with particular emphasis on wiring har- ness and connector failures between the power supply cir- − How to Use Troubleshooting/How to Treat Past Trou- ). DIAGNOSIS Required Special Tools: • MB991958: Scan Tool (M.U.T.-III Sub Assembly) |