DTC    P0A78-523    Drive Motor "A" Inverter Performance

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DESCRIPTION

Refer to the circuit description for DTC P0A78-266 (Click here).

DTC No.
INF Code
DTC Detection Condition
Trouble Area
P0A78
523
Inverter voltage (VH) sensor offset malfunction
  1. HV relay assembly
  2. Inverter with converter assembly

HINT:
Turning the power switch off causes the voltage in the inverter to discharge. The inverter voltage is almost 0 V after discharge. The DTC will be stored if the inverter voltage is more than the specified value after discharge.


A111758E02


INSPECTION PROCEDURE

CAUTION:
  1. Before inspecting the high-voltage system or disconnecting the low voltage connector of the inverter with converter assembly, take safety precautions such as wearing insulated gloves and removing the service plug grip to prevent electrical shocks. After removing the service plug grip, put it in your pocket to prevent other technicians from accidentally reconnecting it while you are working on the high-voltage system.
  2. After disconnecting the service plug grip, wait for at least 10 minutes before touching any of the high-voltage connectors or terminals. After waiting, check the voltage at the inspection point in the inverter with converter assembly. The voltage should be 0 V before beginning work.

HINT:
Waiting for at least 10 minutes is required to discharge the high-voltage capacitor inside the inverter with converter assembly.

1.CHECK DTC OUTPUT (HV)
  1. Connect the intelligent tester to the DLC3.

  1. Turn the power switch on (IG).

  1. Select the following menu items: Powertrain / Hybrid Control / DTC.

  1. Check if DTCs are output.

    Result:

    DTC No.
    Relevant Diagnosis
    P0AE2-773, 161
    SMRP
    P0AE0-228
    SMRG
    P0ADC-226
    SMRB
    P0A1A-156, 658, 659, 151, 155, P0A1B-511, 164, 163, 512, 193, 786, 788, 661, P0A78-266, 267, P0A94-442
    VH sensor circuit
    P0A1A-200, 791, 792, 793, P0A1B-192, 168, 794, 795, 796, P0A3F-243, P0A41-245, P0A40-500, P0A4B-253, P0A4C-513, P0A4D-255
    MG resolver circuit



YES
GO TO DTC CHART
NO

REPLACE INVERTER WITH CONVERTER ASSEMBLY