P0A7A / INF809
P0A7A-809, P0A7A-811Description
The inverter converts high-voltage direct current from the HV battery and alternating current for MG2 and MG1. The inverter contains a three-phase bridge circuit, which consists of six power transistors each for MG2 and MG1, that converts direct current to three-phase alternating current. The MG ECU controls the actuation of the power transistors. The inverter transmits information that is necessary for effecting control, such as the amperage and voltage, to the MG ECU.
The MG ECU uses a voltage sensor, which is built into the inverter, to detect boosted high voltage to allow control of the voltage boost.
The inverter voltage sensor outputs voltage that varies between 0 and 5 V in accordance with the changes in the high voltage. The higher the high voltage, the higher the output voltage, and the lower the high voltage, the lower the output voltage.
The MG ECU monitors the inverter voltage and detects malfunctions.
DTC Logic
DTC Detection Logic
If an abnormal amount of current flows through the generator inverter, the MG ECU detects it and sends a signal to inform the hybrid vehicle control ECU of the malfunction.
If the MG ECU detects that the generator inverter current exceeds the threshold level for a period of time, the hybrid vehicle control ECU will illuminate the MIL and set a DTC.
Diagnostic Procedure
Step 1-3:
