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HYBRID CONTROL SYSTEM, Diagnostic DTC:P0C76-523

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Info Added 2017-08-02

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DTC Code DTC Name
P0C76-523 Hybrid Battery System Discharge Time Too Long
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DESCRIPTION

For a description of the inverter (Click here).

DTC No. INF Code DTC Detection Condition Trouble Area
P0C76 523 Inverter voltage (VH) sensor offset malfunction

  • Inverter with converter assembly

  • Wire harness or connector

  • Power management control ECU
Tip:

When the power switch is turned off, the MG ECU applies current to MG2 in a way that does not generate torque, in order to discharge the residual voltage in the inverter. When the hybrid system is normal, the VH value is almost 0 V after discharge. This DTC will be stored if the VH value is more than the specified value after discharge.

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WIRING DIAGRAM

Refer to the wiring diagram for DTC P0AE6-225 (Click here).

Refer to the wiring diagram for DTC P321E-318 (Click here).

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CAUTION / NOTICE / HINT

CAUTION:

  • 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.

  • After removing the service plug grip, wait for at least 10 minutes before touching any of the high-voltage connectors or terminals. After waiting for 10 minutes, check the voltage at the terminals in the inspection point in the inverter with converter assembly. The voltage should be 0 V before beginning work (Click here).

    Tip:

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

Note:

After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work (Click here).

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PROCEDURE


  1. Click here

    CHECK DTC OUTPUT (HYBRID CONTROL)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.

    4. Check for DTCs.

      Result
      Result Proceed to
      P0C76-523 only is output, or DTCs except the ones in the table below are also output. A
      Any of the following DTCs are also output. B
      DTC No. Relevant Diagnosis
      P0A1A-151, 155, 156, 200, 658, 659, 791, 792, 793 Generator Control Module
      P0A1B-163, 164, 168, 193, 511, 661, 786, 794, 795, 796 Drive Motor "A" Control Module
      P0A1D-148 Hybrid Powertrain Control Module
      P0A3F-243 Drive Motor "A" Position Sensor Circuit
      P0A40-500 Drive Motor "A" Position Sensor Circuit Range/Performance
      P0A41-245 Drive Motor "A" Position Sensor Circuit Low
      P0A4B-253 Generator Position Sensor Circuit
      P0A4C-513 Generator Position Sensor Circuit Range/Performance
      P0A4D-255 Generator Position Sensor Circuit Low
      P0A78-266, 267 Drive Motor "A" Inverter Performance
      P0ADC-226 Hybrid Battery Positive Contactor Control Circuit High
      P0AE0-228 Hybrid Battery Negative Contactor Control Circuit High
      P0AE7-224 Hybrid Battery Precharge Contactor Control Circuit High
      P2511-149 ECM/PCM Power Relay Sensor Circuit Intermittent
      P324E-788 MG-ECU Power Relay Intermittent Circuit
      U0110 (all INF codes)*1 Lost Communication with Drive Motor Control Module "A"
      Tip:

      • *1: If any INF codes are output for this DTC, refer to the corresponding diagnostic procedure.

      • P0C76-523 may be stored due to a malfunction which causes the DTCs in the preceding table to be stored. In this case, first troubleshoot the output DTCs in the preceding table. Then, perform a reproduction test to check that no DTCs are output.

    5. Turn the power switch off.


  2. Click here

    CHECK DTC OUTPUT (HYBRID CONTROL)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.

    4. Check for DTCs.

      Result
      Result Proceed to
      Any of the following DTCs are also output. A
      P0C76-523 only is output, or DTCs except the ones in the table below are also output. B
      DTC No. Relevant Diagnosis
      P0A78-306 Drive Motor "A" Inverter Performance
      P0A7A-344 Generator Inverter Performance
      P0A90-251, 509 Drive Motor "A" Performance
      P0A92-261, 521 Hybrid Generator Performance
      Tip:

      When the DTCs listed in the preceding table are also output, there may be a short between the HSDN (MG shut down signal) circuit and power circuit.

    5. Turn the power switch off.


  3. Click here

    CHECK POWER MANAGEMENT CONTROL ECU


    1. Turn the power switch on (IG).

    2. A0009EXE02

      Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      A33-31 (HSDN) - H1-6 (E1) Power switch on (IG) Below 4.5 V
      Table 1. Text in Illustration
      *a

      Component with harness connected

      (Power Management Control ECU)

    3. Turn the power switch off.


  4. Click here

    CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - INVERTER WITH CONVERTER ASSEMBLY)

    CAUTION:

    Be sure to wear insulated gloves.


    1. Check that the service plug grip is not installed.

      Note:

      After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair manual because this may cause a malfunction.

    2. Disconnect the A14 inverter with converter assembly connector.

    3. Disconnect the A33 power management control ECU connector.

    4. Connect the cable to the negative (-) auxiliary battery terminal.

    5. Turn the power switch on (IG).

    6. A0006DKE03

      Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      A33-31 (HSDN) or A14-40 (HSDN) - Body ground Power switch on (IG) Below 1 V
      Table 2. Text in Illustration
      *a

      Rear view of wire harness connector

      (to Power Management Control ECU)
      *b

      Front view of wire harness connector

      (to Inverter with Converter Assembly)
      Note:

      Turning the power switch on (IG) with the connector disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.

    7. Turn the power switch off.

    8. Disconnect the cable from the negative (-) auxiliary battery terminal.

    9. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      A33-31 (HSDN) - A33-1 (IG2) Power switch off 10 kΩ or higher
      A33-31 (HSDN) - A33-2 (IG2D) Power switch off 10 kΩ or higher
      A33-31 (HSDN) - A33-5 (+B1) Power switch off 10 kΩ or higher
      A33-31 (HSDN) - A33-6 (MREL) Power switch off 10 kΩ or higher
      A14-40 (HSDN) - A14-30 (+B) Power switch off 10 kΩ or higher
      A14-40 (HSDN) - A14-31 (+B2) Power switch off 10 kΩ or higher

    10. Reconnect the A14 inverter with converter assembly connector.

    11. Reconnect the A33 power management control ECU connector.


    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  5. Click here

    CHECK INVERTER WITH CONVERTER ASSEMBLY

    CAUTION:

    Be sure to wear insulated gloves.


    1. Check that the service plug grip is not installed.

      Note:

      After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair manual because this may cause a malfunction.

    2. Disconnect the A14 inverter with converter assembly connector.

    3. A000451E03

      Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      A14-40 (HSDN) - A14-30 (+B) Power switch off 5 kΩ or higher
      A14-40 (HSDN) - A14-31 (+B2) Power switch off 5 kΩ or higher
      Table 3. Text in Illustration
      *a

      Component without harness connected

      (Inverter with Converter Assembly)

    4. Reconnect the A14 inverter with converter assembly connector.


    • OK

      REPLACE POWER MANAGEMENT CONTROL ECU (Click here)

    • NG

      REPLACE INVERTER WITH CONVERTER ASSEMBLY (Click here)