HYBRID CONTROL SYSTEM, Diagnostic DTC:P0A78-266, P0A78-267

DTC Code DTC Name
P0A78-266 Drive Motor "A" Inverter Performance
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 and MG2. The inverter converts high-voltage direct current from the HV battery into three-phase alternating current for MG1 and MG2; it also converts three-phase alternating current supplied by MG1 and MG2 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.

A01JBB1E01

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 Short to GND in the inverter voltage (VH) signal line Inverter with converter assembly
P0A78 267 Open or short to +B in the inverter voltage (VH) signal line

INSPECTION PROCEDURE

Tech Tips

After the repair, clear the DTCs and perform the following procedure to check that DTCs are not output.


  1. Turn the power switch on (READY) and wait for 5 seconds or more.

PROCEDURE


  1. REFER TO REPLACE INVERTER WITH CONVERTER ASSEMBLY PARTS


    1. Refer to replace inverter with converter assembly parts Click here.

      Tech Tips

      The signal line from the inverter voltage (VH) sensor is connected to the MG ECU inside the inverter with converter assembly.


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    COMPLETED