HYBRID CONTROL SYSTEM, Diagnostic DTC:P0C73-776

DTC Code DTC Name
P0C73-776 Motor Electronics Coolant Pump "A" Control Performance

DESCRIPTION

The inverter water pump with motor assembly transmits rotation revolution information to the power management control ECU. The power management control ECU monitors the revolution and detects malfunctions.

DTC No. INF Code DTC Detection Condition Trouble Area
P0C73 776 A revolution or intermittent stop malfunction occurs in the inverter water pump with motor assembly.

  • Inverter cooling system

  • Wire harness or connector

  • Inverter water pump with motor assembly

  • Power management control ECU

WIRING DIAGRAM

A01FSLYE01

INSPECTION PROCEDURE

Note

If DTC P0A78-284, 286, P0A7A-322, 324, P0A94-553 or 557 is output, replace the inverter with converter assembly after this inspection.

PROCEDURE


  1. CHECK QUANTITY OF HV COOLANT


    1. Check the HV coolant level in the inverter reserve tank.

    2. Check for HV coolant leaks.

      Result
      Result Proceed to
      HV coolant leaks are not evident. A sufficient amount of coolant remains in the inverter reserve tank. A
      HV coolant leaks are not evident. No coolant remains in the inverter reserve tank. B
      HV coolant leaks are evident. C

      Tech Tips

      After repairing the HV coolant leaks and adding coolant, perform the "Activate the Water Pump" Active Test (HV Active Test item) and the "Control the Electric Cooling Fan" Active Test (Engine Active Test item) and make sure that there are no malfunctions.


    B

    ADD HV COOLANT Click here

    C

    INSPECT FOR HV COOLANT LEAK Click here

    A

  2. CHECK COOLANT HOSE


    1. Check if the hoses of the cooling system are kinked or clogged.


    NG

    CORRECT THE PROBLEM Click here

    OK

  3. READ VALUE USING GTS (INVERTER W/P REVOLUTION)

    Note

    Be sure to perform the inspection with the auxiliary battery voltage at 11 V or more.

    Tech Tips

    When the auxiliary battery voltage is low, the inverter water pump with motor assembly may not operate.


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Enter the following menus: Powertrain / Hybrid Control / Data List / Inverter W/P Revolution.

    4. Read the Data List.

      OK
      Tester Display Switch Condition Specified Condition
      Inverter W/P Revolution Power switch on (IG) 625 rpm or less

    5. Turn the power switch off.


    NG

    Click here

    OK

  4. PERFORM ACTIVE TEST USING GTS (ACTIVATE THE WATER PUMP)

    Note

    Be sure to perform the inspection with the auxiliary battery voltage at 11 V or more.

    Tech Tips

    When the auxiliary battery voltage is low, the inverter water pump with motor assembly may not operate.


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Enter the following menus: Powertrain / Hybrid Control / Active Test / Activate the Water Pump.

    4. Select Inverter W/P Revolution in the Data List.

    5. While performing the "Activate the Water Pump" Active Test, check Inverter W/P Revolution in the Data List.

      OK
      Tester Display Switch Condition Specified Condition
      Inverter W/P Revolution Power switch on (IG) 2750 to 6000 rpm

      Tech Tips

      Perform the Active Test with the inverter coolant temperature between -15 and 65°C (5 to 149°F).

    6. Turn the power switch off.


    NG

    Click here

    OK

  5. CHECK HV COOLANT (CHECK FOR CONDITIONS THAT MAY HAVE CAUSED FREEZING)


    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. Read the freeze frame data Ambient Temperature using the GTS.

    5. Check if the freeze frame data Ambient Temperature is below freezing.

      Result
      Result Proceed to
      Ambient Temperature value is above freezing temperature of the HV coolant. A
      Ambient Temperature value is below freezing temperature of the HV coolant. B

      Tech Tips


      • HV coolant (SLLC) with a 30% concentration freezes at -15°C (5°F) and HV coolant (SLLC) with a 50% concentration freezes at -35°C (-31°F).

      • If the HV coolant freezes in the HV radiator or HV water pump, the coolant temperature in the inverter with converter assembly rises because the HV coolant cannot circulate. As a result, a DTC may be stored.

      • A DTC is stored when the HV water pump impeller cannot rotate due to freezing of the HV coolant.

      • If a DTC is stored due to freezing of HV coolant, the problem cannot be reproduced. Judge whether freezing of HV coolant occurred according to the freeze point of the HV coolant, HV coolant change history and ambient temperature when the DTC was stored.

    6. Turn the power switch off.


    B

    Click here

    A

    REPLACE INVERTER WATER PUMP WITH MOTOR ASSEMBLY Click here

  6. ADD HV COOLANT


    1. Add HV coolant up to the high level in the reserve tank.


    NEXT

    Click here

  7. INSPECT FOR HV COOLANT LEAK


    1. Diagnose and repair the HV coolant leak.


    NEXT

    Click here

  8. CORRECT THE PROBLEM


    1. Correct the coolant hose.


    NEXT

    Click here

  9. CHECK CONNECTOR CONNECTION CONDITION (POWER MANAGEMENT CONTROL ECU CONNECTOR)


    1. A01FQC6E01
      Text in Illustration
      *A for LHD
      *B for RHD

      Check the connector connections and contact pressure of the relevant terminals for the power management control ECU connectors Click here.

      OK
      The connectors are connected securely and there are no contact pressure problems.

    NG

    CONNECT SECURELY Click here

    OK

  10. CHECK CONNECTOR CONNECTION CONDITION (INVERTER WATER PUMP WITH MOTOR ASSEMBLY CONNECTOR)


    1. A01FTJG

      Check the connector connections and contact pressure of the relevant terminals for the inverter water pump with motor assembly connector Click here.

      OK
      The connectors are connected securely and there are no contact pressure problems.

    NG

    CONNECT SECURELY Click here

    OK

  11. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - INVERTER WATER PUMP WITH MOTOR ASSEMBLY)


    1. Disconnect the connector from the power management control ECU.

    2. Disconnect the connector from the inverter water pump with motor assembly.

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

      A01FS70E05
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Power Management Control ECU)

      		 *b

      Front view of wire harness connector

      (to Inverter Water Pump with Motor Assembly)
      Standard Resistance (Check for Open)
      Tester Connection Switch Condition Specified Condition
      A35-13 (IWP) - A26-3 (SWP) Power switch off Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Switch Condition Specified Condition
      A35-13 (IWP) or A26-3 (SWP) - Body ground and other terminals Power switch off 10 kΩ or higher

    4. Connect the power management control ECU connector.

    5. Connect the inverter water pump with motor assembly connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  12. READ VALUE USING GTS (INVERTER W/P REVOLUTION)

    Note

    Be sure to perform the inspection with the auxiliary battery voltage at 11 V or more.

    Tech Tips

    When the auxiliary battery voltage is low, the inverter water pump with motor assembly may not operate.


    1. Connect the GTS to the DLC3.

    2. Disconnect connector A26 from the inverter water pump with motor assembly.

    3. Turn the power switch on (IG).

    4. Enter the following menus: Powertrain / Hybrid Control / Data List / Inverter W/P Revolution.

    5. Read the Data List.

      OK
      Tester Display Switch Condition Specified Condition
      Inverter W/P Revolution Power switch on (IG) 125 rpm or less

    6. Connect the inverter water pump with motor assembly connector.

    7. Turn the power switch off.


    NG

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    OK

  13. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - INVERTER WATER PUMP WITH MOTOR ASSEMBLY)


    1. Disconnect the connector from the power management control ECU.

    2. Turn the power switch on (IG).

    3. A01FQSYE32
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Power Management Control ECU)

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A35-13 (IWP) - N91-6 (E1) Power switch on (IG) 11 to 14 V

      Note

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

    4. Turn the power switch off.

    5. Connect the power management control ECU connector.


    NG

    REPLACE INVERTER WATER PUMP WITH MOTOR ASSEMBLY Click here

    OK

  14. CHECK POWER MANAGEMENT CONTROL ECU (CHECK WAVEFORM)


    1. Turn the power switch on (IG).

    2. A01FV0LE20
      Text in Illustration
      *a

      Component with Harness Connected

      (Power Management Control ECU)

      While turning the power switch on (IG), check the waveform between the power management control ECU terminals.

      Item Content
      Terminal A35-13 (IWP) - N91-6 (E1)
      Equipment Setting 5 V/DIV., 50 ms./DIV.
      Condition Power switch on (IG)
      OK
      Waveform duty ratio is between 3% and 9%.

    3. Turn the power switch off.


    NG

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    OK

    REPLACE INVERTER WATER PUMP WITH MOTOR ASSEMBLY Click here

  15. CONNECT SECURELY


    1. Connect the power management control ECU connectors securely.


    NEXT

    Click here

  16. CONNECT SECURELY


    1. Connect the inverter water pump with motor assembly connector securely.


    NEXT

    Click here

  17. REPAIR OR REPLACE HARNESS OR CONNECTOR


    NEXT

    Click here

  18. REPLACE POWER MANAGEMENT CONTROL ECU

    Click here


    NEXT

    Click here

  19. REPLACE POWER MANAGEMENT CONTROL ECU

    Click here


    NEXT

    Click here

  20. REPLACE HV COOLANT


    1. Replace the HV coolant with coolant having an appropriate concentration (appropriate freeze point) for the vehicle usage conditions Click here.


    NEXT

  21. CHECK INVERTER WATER PUMP WITH MOTOR ASSEMBLY


    1. Perform a road test and check that DTCs are not stored.

      CAUTION:

      Perform this road test only in an appropriate safe location, in accordance with all local laws.

      OK
      DTCs are not stored.

    NG

    REPLACE INVERTER WATER PUMP WITH MOTOR ASSEMBLY Click here

    OK

    COMPLETED