BMU5 ECU hardware memory failure
• Replace BMU(E81).
What you'll see
No driver-visible symptom recorded.
System reaction
• Hybrid amber warning is shown in ICL • BMU(E81) will stop sending CAN messages and will set discrete outputs in fail safe modes
Diagnostic depth
Detection Faults are detected using different methods for different types of memories. The following checks are applied for the respective memory type: • program flash is checked against a pre-calculated checksum • calibration flash is checked against a pre-calculated checksum • internal RAM is checked with the CPU built-in ECC function (see manual for MPC5668E) • EEprom emulated in flash is monitored in various data consistency checks • Stack memory is checked with the CPU built-in ECC function (see manual for MPC5668E)
ECU hardware failure