P0A78-266

L110F HYBRID VEHICLE CONTROL: HYBRID CONTROL SYSTEM: P0A78-266: Drive Motor "A" Inverter Performance

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 each for MG2 and MG1. The inverter converts high-voltage direct current from the HV battery into three-phase alternating current for MG2 and MG1, it also converts three-phase alternating current supplied by MG2 and MG1 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.






MONITOR DESCRIPTION

The MG ECU monitors the inverter voltage (VH) sensor circuit. If the MG ECU detects an open or short in the VH sensor circuit, the hybrid vehicle control ECU will illuminate the MIL and set a DTC.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS





TYPICAL MALFUNCTION THRESHOLDS





COMPONENT OPERATING RANGE





INSPECTION PROCEDURE

PROCEDURE

1. REPLACE INVERTER WITH CONVERTER ASSEMBLY
(a) Replace the inverter with converter assembly Components.
HINT: The signal line from the inverter voltage (VH) sensor is connected to the MG ECU inside the inverter with converter assembly. If P0A78-266 or P0A78-267 is output, replace the inverter with converter assembly.

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