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HYBRID CONTROL SYSTEM, Diagnostic DTC:P0AEE-276, P0AEE-277

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DTC Code DTC Name
P0AEE-276 Motor Inverter Temperature Sensor "A" Circuit Range / Performance
P0AEE-277 Motor Inverter Temperature Sensor "A" Circuit Range / Performance
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DESCRIPTION

Refer to the description for DTC P0AEF-275 (Click here).

DTCNo. INF Code DTC Detection Condition Trouble Area
P0AEE 276 Unusual sudden change in motor inverter temperature sensor output occurs, or that change occurs repeatedly.

  • Inverter cooling system

  • Water pump with motor and bracket assembly

  • Inverter with converter assembly

  • Fan motor

  • Cooling fan ECU

  • Multiplex network front light ECU (Front controller)

  • Fusible link block assembly

  • Fuse

  • Hybrid vehicle control ECU

  • Wire harness or connector
P0AEE 277 Motor inverter temperature sensor output deviation
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INSPECTION PROCEDURE

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PROCEDURE


  1. Click here

    CHECK DTC OUTPUT (HV)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

    3. Select the following menu items: Powertrain / Hybrid Control / Trouble Codes.

    4. Check if DTCs are output.

      Result
      Result Proceed to
      P0AEE-276 or P0AEE-277 only is output. A
      P0A93-346 is also output. B
      DTC No. Relevant Diagnosis
      P0A93-346 Inverter Cooling System Performance

  2. Click here

    CHECK QUANTITY OF HV COOLANT


    1. A01H01QE01

      Check the coolant level in the inverter reserve tank.

    2. Check for coolant leaks.

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

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


  3. Click here

    CHECK COOLANT HOSE


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


  4. Click here

    PERFORM ACTIVE TEST USING INTELLIGENT TESTER (WATER PUMP)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

    3. Select the following menu items: Powertrain / Hybrid Control / Active Test / Activate the Water Pump.

    4. Perform the "Activate the Water Pump" active test for at least 1 minute.

    5. A01H01QE01

      Check that there are ripples in the coolant in the inverter reserve tank.

      OK
      There are ripples in the coolant in the inverter reserve tank as long as the active test is being performed.
      Note:

      In addition to the active test, the water pump with motor and bracket assembly will also operate with the power switch on (READY). However, the water pump with motor and bracket assembly will operate at low speed for 20 seconds after the power switch is turned on (READY).

      Tip:

      The water pump with motor and bracket assembly will also operate in inspection mode.


  5. Click here

    PERFORM ACTIVE TEST USING INTELLIGENT TESTER (COOLING FAN)


    1. Select the following menu items: Powertrain / Engine and ECT / Active Test / Control the Electric Cooling Fan.

    2. Perform the "Control the Electric Cooling Fan" active test.

      OK
      The cooling fan rotates.

  6. Click here

    CHECK CONNECTOR CONNECTION CONDITION (INVERTER WITH CONVERTER ASSEMBLY CONNECTOR)

    Note:

    Before disconnecting the connector, confirm that it is properly connected by checking that the locking claws are engaged and that the connector cannot be pulled out.


    1. Check the connection of the low voltage connector of the inverter with converter assembly.

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

      When connecting the connector, insert it with the locking lever in the raised position. Rotate the lever downward and make sure that the connector is pulled into its socket. When the locking lever is in its fully closed position, a click will be heard as its locking claws engage. After the click is heard, pull up on the connector to confirm that it is properly connected.


  7. Click here

    INSPECT COOLING SYSTEM (FOR CLOGGING)


    1. Drain the inverter coolant (Click here).

      Note:

      Do not reuse the drained coolant because it may contain foreign objects.

      Tip:

      Drain the inverter coolant with the inverter reserve tank cap installed.

    2. Install the inverter reserve tank cap.

    3. Remove the drain plug.

    4. A01H22SE01

      Disconnect end A of the No. 3 inverter cooling hose.

      Note:

      • Applied air pressure should be 59 kPa (0.6 kgf/cm2, 8.6 psi) or less.

      • Be careful when disconnecting the hose. Coolant may spill out of the hose.

    5. A01H0T5E01

      Cover the pipe shown in the illustration with packing tape.

    6. Using an air gun, apply air to the disconnected end of the hose to check for clogging in the coolant path.

      Note:

      Be careful when applying air. Applying excessive air may cause coolant to overflow from the inverter reserve tank cap.

      OK
      Coolant and air come out from the drain.
    7. A01H22SE01

      Connect end A of the No. 3 inverter cooling hose and disconnect end B.

    8. A01GYTSE01

      Cover the pipe shown in the illustration with packing tape.

    9. Using an air gun, apply air to the disconnected end of the hose to check for clogging in the coolant path.

      Note:

      • Applied air pressure should be 59 kPa (0.6 kgf/cm2, 8.6 psi) or less.

      • Be careful when applying air. Applying excessive air may cause coolant to overflow from the inverter reserve tank cap.

      OK
      Coolant and air come out from the drain.
      Result
      Result Proceed to
      OK (for LHD) A
      OK (for RHD) B
      NG C

    10. After this inspection, check for coolant leaks from the hose with the power switch on (READY).

      Note:

      If leaks are found, replace the No. 3 inverter cooling hose and clamps.


  8. Click here

    PERFORM ACTIVE TEST USING INTELLIGENT TESTER (WATER PUMP)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

    3. Select the following menu items: Powertrain / Hybrid Control / Active Test / Activate the Water Pump.

    4. Perform the "Activate the Water Pump" active test for at least 1 minute.

    5. A01H01QE01

      Check that there are ripples in the coolant in the inverter reserve tank.

      OK
      There are ripples in the coolant in the inverter reserve tank as long as the active test is being performed.
      Note:

      In addition to the active test, the water pump with motor and bracket assembly will also operate with the power switch on (READY). However, the water pump with motor and bracket assembly will operate at low speed for 20 seconds after the power switch is turned on (READY).

      Tip:

      The water pump with motor and bracket assembly will also operate in inspection mode.


  9. Click here

    CHECK FUSE (INV W/P)


    1. A01GYN7E01

      Check if there is an open circuit in the fuse (INV W/P) in the engine room No. 2 relay block.

      OK
      There is no open circuit in the fuse (INV W/P).
      Tip:

      If the result is NG, replace the fuse (INV W/P) with a new one.


  10. Click here

    CHECK CONNECTOR CONNECTION CONDITION (WATER PUMP WITH MOTOR AND BRACKET ASSEMBLY CONNECTOR)


    1. A01GZ88

      Check the connection of the water pump with motor and bracket assembly connector.

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

  11. Click here

    CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU CONNECTOR)


    1. Check the connections of the hybrid vehicle control ECU connectors.

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

  12. Click here

    CHECK HARNESS AND CONNECTOR (WATER PUMP WITH MOTOR AND BRACKET ASSEMBLY)


    1. Disconnect connector A78 from the hybrid vehicle control ECU.

    2. Remove the fuse (INV W/P) from the engine room No. 2 relay block.

    3. Disconnect the water pump with motor and bracket assembly connector.

    4. A01H19IE04

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

      Standard resistance (Check for open)
      Tester Connection Switch Condition Specified Condition
      A78-23 (IWP) - zA1-2 (SWP) Power switch off Below 1 Ω
      zA1-3 (GND) - Body ground Power switch off Below 1 Ω
      Engine Room No. 2 Relay Block INV W/P Fuse Terminal 2 - zA1-4 (+BWP) Power switch off Below 1 Ω
      Standard resistance (Check for short)
      Tester Connection Switch Condition Specified Condition
      A78-23 (IWP) or zA1-2 (SWP) - Body ground and other terminals Power switch off 10 kΩ or higher
      Engine Room No. 2 Relay Block INV W/P Fuse Terminal 2 or zA1-4 (+BWP) - Body ground and other terminals Power switch off 10 kΩ or higher

  13. Click here

    CHECK WATER PUMP WITH MOTOR AND BRACKET ASSEMBLY


    1. A01GWJ8E01

      Apply 12 V to terminal 2 of the INV W/P fuse holder of the engine room No. 2 relay block and check that the water pump operates.

      OK
      The water pump operates.

  14. Click here

    CHECK CONNECTOR CONNECTION CONDITION (WATER PUMP WITH MOTOR AND BRACKET ASSEMBLY CONNECTOR)


    1. A01GZ88

      Check the connection of the water pump with motor and bracket assembly connector.

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

  15. Click here

    CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU CONNECTOR)


    1. Check the connections of the hybrid vehicle control ECU connectors.

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

  16. Click here

    CHECK HARNESS AND CONNECTOR (WATER PUMP WITH MOTOR AND BRACKET ASSEMBLY)


    1. Disconnect connector A78 from the hybrid vehicle control ECU.

    2. Remove the fuse (INV W/P) from the engine room No. 2 relay block.

    3. Disconnect the water pump with motor and bracket assembly connector.

    4. A01H19IE04

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

      Standard resistance (Check for open)
      Tester Connection Switch Condition Specified Condition
      A78-23 (IWP) - zA1-2 (SWP) Power switch off Below 1 Ω
      zA1-3 (GND) - Body ground Power switch off Below 1 Ω
      Engine Room No. 2 Relay Block INV W/P Fuse Terminal 2 - zA1-4 (+BWP) Power switch off Below 1 Ω
      Standard resistance (Check for short)
      Tester Connection Switch Condition Specified Condition
      A78-23 (IWP) or zA1-2 (SWP) - Body ground and other terminals Power switch off 10 kΩ or higher
      Engine Room No. 2 Relay Block INV W/P Fuse Terminal 2 or zA1-4 (+BWP) - Body ground and other terminals Power switch off 10 kΩ or higher

  17. Click here

    CHECK WATER PUMP WITH MOTOR AND BRACKET ASSEMBLY


    1. A01GWJ8E01

      Apply 12 V to terminal 2 of the INV W/P fuse holder of the engine room No. 2 relay block and check that the water pump operates.

      OK
      The water pump operates.

  18. Click here

    GO TO DTC CHARTClick here

  19. Click here

    ADD HV COOLANT

  20. Click here

    CHECK FOR COOLANT LEAKS AND ADD COOLANT

  21. Click here

    CORRECT THE PROBLEM

  22. Click here

    CHECK COOLING FAN SYSTEMClick here

  23. Click here

    CONNECT SECURELY

  24. Click here

    REPLACE INVERTER WITH CONVERTER ASSEMBLYClick here

  25. Click here

    ADD HV COOLANT

  26. Click here

    REPLACE HYBRID VEHICLE CONTROL ECUClick here

  27. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  28. Click here

    REPLACE WATER PUMP WITH MOTOR AND BRACKET ASSEMBLYClick here

  29. Click here

    REPLACE MALFUNCTIONING PARTS

  30. Click here

    REPLACE INVERTER WITH CONVERTER ASSEMBLYClick here