Toyota Hybrid System Diagnosis HV Battery Control Systems

The principal role of the hybrid battery system is to monitor the condition of the HV battery assembly through the use of the battery ECU. That information is then transmitted to the HV Control ECU. The battery ECU calculates the SOC (State of Charge) of the HV battery based on voltage, current and temperature. It then sends the results to the HV Control ECU. As a result, the proper charge and discharge control is performed.

This system also controls the battery blower motor controller in order to maintain a proper temperature at the HV battery assembly. To do this while the vehicle is being driven, the battery ECU determines and controls the operating mode of the battery blower assembly in accordance with the temperature of the HV battery assembly.

ALWAYS wear high-voltage insulated gloves when diagnosing the Hybrid System. Check your gloves before wearing! Even a tiny pinhole can be dangerous, as electricity will find its' way in. To check your gloves, blow air into each glove, hold the glove tight like a balloon and make sure no air escapes.

Careless handling of this hybrid system may result in electrocution or electrical leakage. When servicing the hybrid system strictly follow the instructions found in the Repair Manual. In the HV battery pack, six nickel metal hydride type 1.2V cells are connected in series to form one module. In the '01-03 Prius, 38 modules are divided into two holders and connected in series. Thus, the HV battery contains a total of 228 cells and has a rated voltage of 273.6V. In the '04 and later Prius, 28 modules are connected for a rated voltage of 201.6V. The cells are now connected in two places, reducing the internal resistance of the battery. Download free Toyota Hybrid System Diagnosis HV Battery Control Systems pdf here

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