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 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 assembly.

  • Inverter cooling system

  • Wire harness or connector

  • Inverter water pump assembly

  • Power management control ECU

MONITOR DESCRIPTION

The power management control ECU monitors revolution of the inverter water pump assembly. If there is an abnormality in revolution, the power management control ECU will illuminate the MIL and set a DTC.

MONITOR STRATEGY

Related DTCs P0C73 (INF 776): Water pump malfunction
Required sensors / components Inverter water pump assembly
Frequency of operation Continuous
Duration TMC's intellectual property
MIL operation 1 driving cycle
Sequence of operation None

TYPICAL ENABLING CONDITIONS

The monitor will run whenever the following DTCs are not present TMC's intellectual property
Other conditions belong to TMC's intellectual property -

TYPICAL MALFUNCTION THRESHOLDS

TMC's intellectual property -

COMPONENT OPERATING RANGE

Power management control ECU DTC P0C73 (INF 776) is not detected

CONFIRMATION DRIVING PATTERN

A011Y31E03

  1. Connect the Techstream to the DLC3.

  2. Turn the power switch on (IG) and turn the Techstream on.

  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).

  4. Turn the power switch off.

  5. Turn the power switch on (IG) and check that there are no abnormalities (abnormal sounds, coolant leaks, DTC output, etc).

  6. Turn the power switch on (READY) and turn the Techstream on. [A]

  7. Wait for 2 minutes or more.

  8. Enter the following menus: Powertrain / Hybrid Control / Trouble Codes. [B]

  9. Check that permanent DTCs are cleared.

  10. If the permanent DTCs are not cleared, perform a universal trip, and then check for permanent DTCs again.

Tech Tips

  • If a permanent DTC is output, the system is malfunctioning.

  • If no permanent DTC is output, the system is normal.

WIRING DIAGRAM

A011WU6E01

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 TECHSTREAM (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 assembly may not operate.

    1. Connect the Techstream 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.

      Result
      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 TECHSTREAM (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 assembly may not operate.

    1. Connect the Techstream 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.

      Result
      Tester Display Switch Condition Specified Condition
      Inverter W/P Revolution Power switch on (IG) 2500 to 5875 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 Techstream 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 Techstream.

    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 set.

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

      • If a DTC is set 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 set.

    6. Turn the power switch off.

    B

    Click here

    A

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

      A011X3A
      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 ASSEMBLY CONNECTOR)

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

      A011XCM
      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 ASSEMBLY)

    1. Disconnect connector A38 from the power management control ECU.

    2. Disconnect connector A50 from the inverter water pump assembly.

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

      A011X5IE01
      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 Assembly)
      Standard Resistance (Check for Open)
      Tester Connection Switch Condition Specified Condition
      A50-3 (SWP) - A38-13 (IWP) Power switch off Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Switch Condition Specified Condition
      A50-3 (SWP) or A38-13 (IWP) - 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 assembly connector.

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  12. READ VALUE USING TECHSTREAM (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 assembly may not operate.

    1. Connect the Techstream to the DLC3.

    2. Disconnect connector A50 from the inverter water pump assembly.

    3. Turn the power switch on (IG).

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

    5. Read the Data List.

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

    6. Connect the inverter water pump 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 ASSEMBLY)

    1. Disconnect connector A38 from the power management control ECU.

    2. Turn the power switch on (IG).

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

      A011XFSE20
      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A38-13 (IWP) - I3-6 (E1) Power switch on (IG) 11 to 14 V
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Power Management Control ECU)

      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 ASSEMBLY Click here

    OK

  14. CHECK POWER MANAGEMENT CONTROL ECU (CHECK WAVEFORM)

    1. Turn the power switch on (IG).

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

      A011YF9E08
      Item Content
      Terminal A38-13 (IWP) - I3-6 (E1)
      Equipment Setting 5 V/DIV., 50 ms./DIV.
      Condition Power switch on (IG)
      Text in Illustration
      *a

      Component with Harness Connected

      (Power Management Control ECU)
      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 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 assembly connector securely.

    NEXT

    Click here

  17. REPLACE POWER MANAGEMENT CONTROL ECU

    Click here

    NEXT

    Click here

  18. REPLACE POWER MANAGEMENT CONTROL ECU

    Click here

    NEXT

    Click here

  19. 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

  20. CHECK INVERTER WATER PUMP 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 ASSEMBLY Click here

    OK

    COMPLETED