The Electric motor (M53) in the MPU has stopped due to over temperature, blocked or jammed.
• If DTC is active: Read signal RTDB_MPU_OVER_TEMP_CUTOFF_E (F449) and RTDB_MPU_MOTOR_BLOCKED_CUTOFF_E (F447) to see root cause of fault. • Check MPU unit for mechanical faults, in pump, or el. motor (M53) Verify that the issue is solved by performing a Diagnostic SelfTest (requires Parking Brake to be applied) - If the root cause fault has been fixed, this DTC will be set passive.
What you'll see
No driver-visible symptom recorded.
System reaction
Red Steer tag axle fault warn EST in released or fixed mode
Diagnostic depth
The electric motor(M53) in the MPU has stopped due to over temperature, beeing blocked or jammed. Component code M53.
• Motor/electronics/environment too hot: - Insufficient cooling - very high ambient temperature and excessive use • MPU pump drive torque exceeds the maximum motor torque during start-up, • Reports mechanical failure if temperature is equal or higher than 100°C considering all load conditions.