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Home >> Toyota >> 2015 >> Avalon Hybrid Limited >> Repair and Diagnosis >> Hybrid/Electric Powertrain >> Testing and Diagnosis >> Hybrid Control System - Diagnostic Codes - (Hybrid) (4 Of 8) >> Hybrid Control System >> DTC P0C76-523: Hybrid Battery System Discharge Time Too Long [10/2015 - ] >> Procedure

DTC P0C76-523: Hybrid Battery System Discharge Time Too Long [10/2015 - ]: Procedure

  1. CHECK DTC OUTPUT (HYBRID CONTROL) 
    1. Connect the Techstream 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 including pending DTCs are also output. B
      DTC No. Relevant Diagnosis
      P06B0-163 Sensor Power Supply "A" Circuit / Open
      P06D6-511 Sensor Reference Voltage "F" Circuit / Open
      P06E6-164 Sensor Power Supply "C" Circuit / Open
      P0A1A-151, 658, 791 Generator Control Module
      P0A1B-786, 794 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
      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
      P0D2F-266 Drive Motor "A" Inverter Voltage Sensor Circuit Low
      P0D30-267 Drive Motor "A" Inverter Voltage Sensor Circuit High
      P1C2A-155 Generator A/D Converter Circuit
      P1CA6-156 Generator Control Module Malfunction
      P1CA7-193 Drive Motor Control Module Malfunction
      P1CAC-200 Generator Position Sensor Angle Malfunction
      P1CAD-168 Drive Motor "A" Position Sensor Angle Malfunction
      P1CAF-792 Generator Position Sensor REF Signal Cycle Malfunction
      P1CB0-795 Drive Motor "A" Position Sensor REF Signal Cycle Malfunction
      P1CB2-793 Generator Position Sensor REF Signal Stop Malfunction
      P1CB3-796 Drive Motor "A" Position Sensor REF Signal Stop Malfunction
      P2511-149 ECM/PCM Power Relay Sense Circuit Intermittent
      P3133-659 Communication Error from Generator to Drive Motor "A"
      P3134-661 Communication Error from Drive Motor "A" to Generator
      P324E-788 MG-ECU Power Relay Intermittent Circuit
      U0110 (all INF codes)*1 Lost Communication with Drive Motor Control Module "A"

      HINT: 

      • *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.

    Result: 

    B 

    GO TO DTC CHART (HYBRID CONTROL SYSTEM) 

    (Refer to DIAGNOSTIC TROUBLE CODE CHART [10/2015 - ] )

    Result: 

    A 

    See step  2

  2. CHECK DTC OUTPUT (HYBRID CONTROL) 
    1. Connect the Techstream 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
      P0A90-251, 509 Drive Motor "A" Performance
      P0A92-261, 521 Hybrid Generator Performance
      P0C19-306 Drive Motor "A" Torque Delivered Performance
      P0E71-344 Generator Torque Delivered Performance

      HINT: 

      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.

    Result: 

    B 

    REPLACE INVERTER WITH CONVERTER ASSEMBLY 

    (Refer to COMPONENTS [10/2014 - ] )

    Result: 

    A 

    See step  3

  3. CHECK HYBRID VEHICLE CONTROL ECU ASSEMBLY 
    1. Turn the power switch on (IG).
    2. Measure the voltage according to the value(s) in the table below.
      GTY601335Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Hybrid Vehicle Control ECU Assembly)

      Standard Voltage

      Tester Connection Condition Specified Condition
      A68-12 (HSDN) - D135-6 (E1) Power switch on (IG) Below 4.5 V
    3. Turn the power switch off.

    Result: 

    OK 

    REPLACE INVERTER WITH CONVERTER ASSEMBLY 

    (Refer to COMPONENTS [10/2014 - ] )

    Result: 

    NG 

    See step  4

  4. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU ASSEMBLY - INVERTER WITH CONVERTER ASSEMBLY) 
    WARNING:

    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 otherwise instructed because this may cause a malfunction.

    2. Disconnect the A50 inverter with converter assembly connector.
    3. Disconnect the A67 and A68 hybrid vehicle control ECU assembly connectors.
    4. Connect the cable to the negative (-) auxiliary battery terminal.
    5. Turn the power switch on (IG).
    6. Measure the voltage according to the value(s) in the table below.
      GTY601727Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Rear view of wire harness connector
      (to Hybrid Vehicle Control ECU Assembly)
      *b Front view of wire harness connector
      (to Inverter with Converter Assembly)

      Standard Voltage

      Tester Connection Condition Specified Condition
      A68-12 (HSDN) or A50-40 (HSDN) - Body ground Power switch on (IG) Below 1 V
      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
      A68-12 (HSDN) - A67-1 (+B2) Power switch off 10 kΩ or higher
      A68-12 (HSDN) - A67-3 (IG2) Power switch off 10 kΩ or higher
      A68-12 (HSDN) - A68-4 (+B1) Power switch off 10 kΩ or higher
      A68-12 (HSDN) - A68-6 (MREL) Power switch off 10 kΩ or higher
      A50-40 (HSDN) - A50-30 (+B) Power switch off 10 kΩ or higher
      A50-40 (HSDN) - A50-31 (+B2) Power switch off 10 kΩ or higher
    10. Reconnect the A50 inverter with converter assembly connector.
    11. Reconnect the A67 and A68 hybrid vehicle control ECU assembly connectors.

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  5

  5. CHECK INVERTER WITH CONVERTER ASSEMBLY 
    WARNING:

    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 otherwise instructed because this may cause a malfunction.

    2. Disconnect the A50 inverter with converter assembly connector.
    3. Measure the resistance according to the value(s) in the table below.
      GTY545042Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Inverter with Converter Assembly)

      Standard Resistance

      Tester Connection Condition Specified Condition
      A50-40 (HSDN) - A50-30 (+B) Power switch off 5 kΩ or higher
      A50-40 (HSDN) - A50-31 (+B2) Power switch off 5 kΩ or higher
    4. Reconnect the A50 inverter with converter assembly connector.

    Result: 

    OK 

    REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY 

    (Refer to COMPONENTS [10/2015 - ] )

    Result: 

    NG 

    REPLACE INVERTER WITH CONVERTER ASSEMBLY 

    (Refer to COMPONENTS [10/2014 - ] )

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