DTC P0A78-266: Drive Motor "A" Inverter Performance; DTC P0A78-267: Drive Motor "A" Inverter Performance: Description
The inverter contains a three-phase bridge circuit, which consists of six power transistors (IGBTs) each for MG1, MG2 and MGR. The inverter converts high-voltage direct current from the HV battery into three-phase alternating current for MG1, MG2 and MGR; it also converts three-phase alternating current supplied by MG1, MG2 and MGR into direct current for the HV battery. The MG ECU controls the actuation of the power transistors (IGBTs). The inverter transmits information necessary for control, such as amperage and voltage, to the MG ECU.
The MG ECU uses an inverter voltage sensor, which is built into the inverter, to detect boosted high voltage to allow control of the voltage boost.
The MG ECU monitors the inverter voltage sensor and detects the following malfunctions.
| DTC No. | INF Code | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| P0A78 | 266 | Open or short to GND in the inverter voltage (VH) signal line | Inverter with converter assembly |
| P0A78 | 267 | Short to +B in the inverter voltage (VH) signal line |