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Home >> Toyota >> 2016 >> Highlander Hybrid Limited >> Repair and Diagnosis >> Hybrid/Electric Powertrain >> Testing and Diagnosis >> Hybrid Control System (2GR-FXE) - Diagnostic Codes (3 Of 7) >> Hybrid Control System >> DTC P0C73-776: Motor Electronics Coolant Pump "A" Control Performance [02/2014 - 11/2016] >> Procedure

DTC P0C73-776: Motor Electronics Coolant Pump "A" Control Performance [02/2014 - 11/2016]: Procedure

  1. CHECK QUANTITY OF HV COOLANT 

    Refer to PROCEDURE - Step 3

    Result

    Result Proceed to
    No leaks are found and the HV coolant level in the inverter reserve tank assembly is above the low line. A
    No leaks are found and the HV coolant level in the inverter reserve tank assembly is below the low line. B
    HV coolant leaks are evident. C

    Result:  2

    B 

    ADD HV COOLANT 

    Result:  3

    C 

    INSPECT FOR HV COOLANT LEAK 

    NOTE:

    In the case of a coolant leak, the inverter water pump assembly activates a fail-safe function. If the inverter water pump assembly is not the cause of the coolant leak, it is not necessary to replace it.

    Result:  1

    A 

    See step  2

  2. CHECK COOLANT HOSE 

    Refer to PROCEDURE - Step 4

    Result

    Proceed to
    OK
    NG

    Result:  2

    NG 

    REPAIR OR REPLACE COOLANT HOSE 

    Result:  1

    OK 

    See step  3

  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.

    HINT: 

    • When the auxiliary battery voltage is low, the inverter water pump assembly may not operate.
    • When the inverter water pump assembly signal line (SWP - IWP) is open or its connection is faulty, the inverter water pump assembly is operated forcibly.
    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.

      Powertrain > Hybrid Control > Data List 

      Tester Display
      Inverter W/P Revolution
    4. Read the Data List.

      Result

      Tester Display Condition Specified Condition
      Inverter W/P Revolution Power switch on (IG)
      During Active Test      		 625 rpm or less

      HINT: 

      When the inverter water pump assembly is not operating, the Data List item "Inverter W/P Revolution" displays a value lower than 625 rpm.

    5. Turn the power switch off.

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    See step  7

    Result:  1

    OK 

    See step  4

  4. CLEAR DTC 

    Refer to PROCEDURE - Step 3

    Result

    Proceed to
    NEXT

    Result:  1

    NEXT 

    See step  5

  5. READ VALUE USING TECHSTREAM (ACTIVATE THE (INVERTER) WATER PUMP) 
    NOTE:

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

    HINT: 

    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 (Inverter) Water Pump.

      Powertrain > Hybrid Control > Active Test 

      Tester Display
      Activate the (Inverter) Water Pump
    4. Select "Inverter W/P Revolution" in the Data List.

      Powertrain > Hybrid Control > Data List 

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

      Result

      Tester Display Condition Specified Condition
      Inverter W/P Revolution Power switch on (IG) 2250 to 5625 rpm

      HINT: 

      • Perform the Active Test with the inverter coolant temperature between -15 and 65°C (5 to 149°F).
      • When the inverter water pump assembly is not operating, the Data List item "Inverter W/P Revolution" displays a value lower than 625 rpm.
    6. Turn the power switch off.

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    See step  7

    Result:  1

    OK 

    See step  6

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

    Refer to PROCEDURE - Step 16

    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

    Result:  1

    A 

    REPLACE INVERTER WATER PUMP ASSEMBLY. Refer to  COMPONENTS [02/2014 - 11/2016] 

    Result:  2

    B 

    REPLACE HV COOLANT. Refer to  PROCEDURE - Step 7 

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

    Refer to PROCEDURE - Step 1

    Result

    Proceed to
    OK
    NG

    Result:  2

    NG 

    CONNECT SECURELY 

    Result:  1

    OK 

    See step  8

  8. 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.

      Refer to ELECTRONIC CIRCUIT INSPECTION PROCEDURE [02/2014 - ]

      GTY433196Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK

      The connector is connected securely and there are no contact problems.

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    CONNECT SECURELY 

    Result:  1

    OK 

    See step  9

  9. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - INVERTER WATER PUMP ASSEMBLY) 
    1. Disconnect the A60 power management control ECU connector.
    2. Disconnect the A9 inverter water pump assembly connector.
    3. Measure the resistance according to the value(s) in the table below.
      GTY445206Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *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 Condition Specified Condition
      A60-13 (IWP) - A9-3 (SWP) Power switch off Below 1 Ω

      Standard Resistance (Check for Short)

      Tester Connection Condition Specified Condition
      A60-13 (IWP) or A9-3 (SWP) - Body ground and other terminals Power switch off 10 kΩ or higher
    4. Reconnect the A9 inverter water pump assembly connector.
    5. Reconnect the A60 power management control ECU connector.

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result:  1

    OK 

    See step  10

  10. 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.

    HINT: 

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

    1. Connect the Techstream to the DLC3.
    2. Remove the INV W/PMP fuse from No. 1 engine room relay block and No. 1 junction block assembly.
    3. Turn the power switch on (IG).
    4. Enter the following menus: Powertrain / Hybrid Control / Data List / Inverter W/P Revolution.

      Powertrain > Hybrid Control > Data List 

      Tester Display
      Inverter W/P Revolution
    5. Read the Data List.

      Result

      Tester Display Condition Specified Condition
      Inverter W/P Revolution Power switch on (IG) 125 rpm or less
    6. Turn the power switch off.
    7. Install the INV W/PMP fuse.

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    REPLACE POWER MANAGEMENT CONTROL ECU. Refer to  COMPONENTS [02/2014 - 11/2016] 

    Result:  1

    OK 

    See step  11

  11. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - INVERTER WATER PUMP ASSEMBLY) 
    1. Disconnect the A60 power management control ECU connector.
    2. Turn the power switch on (IG).
    3. Measure the voltage according to the value(s) in the table below.
      GTY444571Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Rear view of wire harness connector
      (to Power Management Control ECU)

      Standard Voltage

      Tester Connection Condition Specified Condition
      A60 -13 (IWP) - F15-6 (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. Reconnect the A60 power management control ECU connector.

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    REPLACE INVERTER WATER PUMP ASSEMBLY. Refer to  COMPONENTS [02/2014 - 11/2016] 

    Result:  1

    OK 

    See step  12

  12. CHECK POWER MANAGEMENT CONTROL ECU (CHECK WAVEFORM) 
    1. Connect an oscilloscope between the power management control ECU terminals specified in the table below.
    2. Turn the power switch on (IG).
    3. While turning the power switch on (IG), check the waveform between the power management control ECU terminals.
      GTY439431Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Power Management Control ECU)
      Item Content
      Terminal A60 -13 (IWP) - F15-6 (E1)
      Equipment Setting 5 V/DIV., 50 ms./DIV.
      Condition Power switch on (IG)

      OK

      Waveform duty ratio is between 3% and 9%.

    4. Turn the power switch off.

      Result

      Proceed to
      OK
      NG

    Result:  1

    OK 

    REPLACE INVERTER WATER PUMP ASSEMBLY. Refer to  COMPONENTS [02/2014 - 11/2016] 

    Result:  2

    NG 

    REPLACE POWER MANAGEMENT CONTROL ECU. Refer to  COMPONENTS [02/2014 - 11/2016] 

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