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Home >> Lexus >> 2009 >> GS 450h >> Repair and Diagnosis >> Hybrid/Electric Powertrain >> Testing and Diagnosis >> Hybrid Vehicle Control (Diagnostic Codes (P0AE6-225 - U0424-537)) >> Hybrid Control System >> DTC P3226-562: DC/DC Boost Converter Temperature Sensor; DTC P3226-563: DC/DC Boost Converter Temperature Sensor >> Procedure

DTC P3226-562: DC/DC Boost Converter Temperature Sensor; DTC P3226-563: DC/DC Boost Converter Temperature Sensor: Procedure

  1. CHECK DTC OUTPUT (HV) 
    1. Connect the Techstream 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

      DTC No. Relevant Diagnosis
      P0A93-346 Inverter cooling system malfunction

    YES → GO TO DTC CHART 

    NO: Go to next step 

  2. CHECK CONNECTOR CONNECTION CONDITION (INVERTER WITH CONVERTER ASSEMBLY CONNECTOR) 
    1. Turn the power switch off.
    2. Check the connection of the low voltage connector of the inverter with converter assembly.
      Fig 1: Checking Connector Connection Condition (Inverter With Converter Assembly Connector)
      GTY146631Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Result

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

    NG → CONNECT SECURELY 

    OK: Go to next step 

  3. CHECK QUANTITY OF HV COOLANT 
    1. Check for coolant leaks.
      Fig 2: Identifying Water Filler Assembly And Radiator Reserve Tank Assembly
      GTY147089Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check that the water filler assembly contains coolant, and the coolant in the radiator reserve tank assembly is above the low level.

      Result

      Result Proceed to
      Coolant leaks are not evident. Coolant remains in the water filler assembly. A
      Coolant leaks are not evident. No coolant remains in the water filler assembly. B
      Coolant leaks are evident. C

      HINT: 

      After repairing the coolant leaks and adding coolant, perform the "Activate the Water Pump" and "Control the Electric Cooling Fan" active tests and make sure that there are no malfunctions.

    C → CHECK FOR COOLANT LEAKS AND ADD COOLANT 

    B → ADD COOLANT 

    A: Go to next step 

  4. CHECK COOLANT HOSE 
    1. Check if the hoses of the cooling system are kinked or clogged.

    NG → CORRECT THE PROBLEM 

    OK: Go to next step 

  5. PERFORM ACTIVE TEST USING TECHSTREAM (WATER PUMP) 
    1. Connect the Techstream 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.
    5. During the "Activate the Water Pump" active test, open the inverter radiator cap and check that there are ripples in the coolant. Continue the active test for at least 1 minute.

      Result

      There are ripples in the coolant in the water filler assembly for 1 minute.

      Fig 3: Identifying Water Filter Assembly
      GTY124965Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      NOTE:
      • Turning the power switch off or finishing the active test with the inverter radiator cap open will cause the coolant to overflow. Be sure to close the inverter radiator cap before turning the power switch off or finishing the active test.
      • The water with motor pump assembly operates even with the power switch on (READY). However, the water with motor pump assembly will operate at low speed for 20 seconds after power switch is turned on (READY).

      HINT: 

      The water pump motor operates even in maintenance mode.

    NG → See step   7 

    OK: Go to next step 

  6. PERFORM ACTIVE TEST USING TECHSTREAM (COOLING FAN) 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Select the following menu items: Powertrain / Engine and ECT / Active Test / Control the Electric Cooling Fan.
    4. Perform the "Control the Electric Cooling Fan" active test.

      Result

      The cooling fan rotates.

    NG → See step   23 

    OK → See step   28 

  7. PERFORM ACTIVE TEST USING TECHSTREAM (WATER PUMP) 
    1. Connect the Techstream to the DLC3.
      Fig 4: Locating Inlet Hose
      GTY137630Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Compress the inlet hose for the water with motor pump assembly several times.
    3. Turn the power switch on (IG).
    4. Select the following menu items: Powertrain / Hybrid Control / Active Test / Activate the Water Pump.
    5. Perform the "Activate the Water Pump" active test.
    6. During the "Activate the Water Pump" active test, open the inverter radiator cap and check that there are ripples in the coolant. Continue the active test for at least 1 minute.
      Fig 5: Identifying Water Filter Assembly
      GTY124965Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Result

      There are ripples in the coolant in the water filler assembly for 1 minute.

      NOTE:
      • Turning the power switch off or finishing the active test with the inverter radiator cap open will cause the coolant to overflow. Be sure to close the inverter radiator cap before turning the power switch off or finishing the active test.
      • The water with motor pump assembly operates even with the power switch on (READY). However, the water with motor pump assembly will operate at low speed for 20 seconds after power switch is turned on (READY).

      HINT: 

      • Keep compressing the water pump inlet hose until the coolant level in the water filler assembly stops dropping.
      • The water pump motor operates even in maintenance mode.
      • After repairing the coolant leaks and adding coolant, perform the "Activate the Water Pump" and "Control the Electric Cooling Fan" active tests and make sure that there are no malfunctions.

    OK → ADD COOLANT 

    NG: Go to next step 

  8. CHECK FUSE (INV W/P) 
    1. Check the fuse (INV W/P) in the engine room R/B No. 1 for improper installation and open circuits.
      Fig 6: Identifying INV W/P Fuse
      GTY137492Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Result

      The fuse is installed securely. There is no open circuit in the fuse.

    NG → See step   14 

    OK: Go to next step 

  9. CHECK INTEGRATION NO. 1 RELAY (INV W/P) 
    1. Remove the integration relay from the engine room R/B No. 1.
      Fig 7: Identifying Integration Relay Connectors Terminals
      GTY133757Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Specified Condition
      1W-1 - 1V-4 10 kΩ or more
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Specified Condition
      1W-1 - 1V-4 Below 1 Ω
      (Apply battery voltage between 1V-2 and 1V-3)

    NG → REPLACE INTEGRATION NO. 1 RELAY 

    OK: Go to next step 

  10. CHECK CONNECTOR CONNECTION CONDITION (WATER WITH MOTOR PUMP ASSEMBLY CONNECTOR) 
    1. Check the connection of the water with motor pump assembly connector.
      Fig 8: Locating Water With Motor Pump Assembly Connector
      GTY146613Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Result

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

    NG → CONNECT SECURELY 

    OK: Go to next step 

  11. CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU CONNECTOR) 
    1. Check the connections of the hybrid vehicle control ECU connectors.
      Fig 9: Checking Connector Connection Condition (HV Control ECU Connector)
      GTY146608Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Result

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

    NG → CONNECT SECURELY 

    OK: Go to next step 

  12. CHECK HARNESS AND CONNECTOR (WATER WITH MOTOR PUMP ASSEMBLY CIRCUIT) 
    1. Remove the integration relay from the engine room R/B No. 1.
    2. Measure the resistance according to the value(s) in the table below.
      Fig 10: Identifying Integration Relay
      GTY139188Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard resistance (Check for open)

      Tester Connection Specified Condition
      1V-2 - 1V-8 Below 1 Ω
      1V-3 - Body ground Below 1 Ω

      Standard resistance (Check for short)

      Tester Connection Specified Condition
      1V-2 or 1V-8 - Body ground 10 kΩ or more
    3. Disconnect connector A49 from the water with motor pump assembly.
    4. Disconnect connector A54 from the hybrid vehicle control ECU.
    5. Measure the resistance according to the value(s) in the table below.
      Fig 11: Checking Harness And Connector (Water With Motor Pump Assembly Power Source Circuit)
      GTY146628Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard resistance (Check for open)

      Tester Connection Specified Condition
      IWP (A54-61) - SWP (A49-3) Below 1 Ω
      GND (A49-1) - Body ground Below 1 Ω
      1V-4 - +BWP (A49-4) Below 1 Ω

      Standard resistance (Check for short)

      Tester Connection Specified Condition
      IWP (A54-61) or SWP (A49-3) - Body ground 10 kΩ or more
      1V-4 or +BWP (A49-4) - Body ground 10 kΩ or more

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  13. CHECK WATER WITH MOTOR PUMP ASSEMBLY 
    1. Disconnect connector A54 from the hybrid vehicle control ECU.
      Fig 12: Identifying Integration Relay
      GTY139188Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Remove the integration relay from the engine room R/B No. 1.
    3. Apply 12 V to terminal 4 of integration relay vehicle side connector 1V and check that the water with motor pump assembly operates.

      Result

      The water with motor pump assembly operates.

    NG → See step   29 

    OK → See step   30 

  14. CHECK CONNECTOR CONNECTION CONDITION (WATER WITH MOTOR PUMP ASSEMBLY CONNECTOR) 
    1. Check the connection of the water with motor pump assembly connector.
      Fig 13: Locating Water With Motor Pump Assembly Connector
      GTY146613Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK

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

    NG → See step   19 

    OK: Go to next step 

  15. CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU CONNECTOR) 
    1. Check the connections of the hybrid vehicle control ECU connectors.
      Fig 14: Checking Connector Connection Condition (HV Control ECU Connector)
      GTY146608Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK

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

    NG → See step   20 

    OK: Go to next step 

  16. CHECK HARNESS AND CONNECTOR (WATER WITH MOTOR PUMP ASSEMBLY CIRCUIT) 
    1. Remove the integration relay from the engine room R/B No. 1.
    2. Measure the resistance according to the value(s) in the table below.
      Fig 15: Identifying Integration Relay
      GTY139188Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard resistance (Check for open)

      Tester Connection Specified Condition
      1V-2 - 1V-8 Below 1 Ω
      1V-3 - Body ground Below 1 Ω

      Standard resistance (Check for short)

      Tester Connection Specified Condition
      1V-2 or 1V-8 - Body ground 10 kΩ or more
    3. Disconnect connector A49 from the water with motor pump assembly.
    4. Disconnect connector A54 from the hybrid vehicle control ECU.
    5. Measure the resistance according to the value(s) in the table below.
      Fig 16: Checking Harness And Connector (Water With Motor Pump Assembly Power Source Circuit)
      GTY146628Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard resistance (Check for open)

      Tester Connection Specified Condition
      IWP (A54-61) - SWP (A49-3) Below 1 Ω
      GND (A49-1) - Body ground Below 1 Ω
      1V-4 - +BWP (A49-4) Below 1 Ω

      Standard resistance (Check for short)

      Tester Connection Specified Condition
      IWP (A54-61) or SWP (A49-3) - Body ground 10 kΩ or more
      1V-4 or +BWP (A49-4) - Body ground 10 kΩ or more

    NG → See step   21 

    OK: Go to next step 

  17. CHECK WATER WITH MOTOR PUMP ASSEMBLY 
    1. Disconnect connector A54 from the hybrid vehicle control ECU.
      Fig 17: Identifying Integration Relay
      GTY139188Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Remove the integration relay from the engine room R/B No. 1.
    3. Apply 12 V to terminal 4 of integration relay vehicle side connector 1V and check that the water pump operates.

      OK

      The water pump operates.

    NG → See step   22 

    OK: Go to next step 

  18. REPLACE HYBRID VEHICLE CONTROL ECU 
    1. Replace the hybrid vehicle control ECU. Refer to COMPONENTS .

    NEXT → REPLACE FUSE (INV W/P) 

  19. CONNECT SECURELY 
    1. Connect the water with motor pump assembly connector securely.

    NEXT → REPLACE FUSE (INV W/P) 

  20. CONNECT SECURELY 
    1. Connect the hybrid vehicle control ECU connector securely.

    NEXT → REPLACE FUSE (INV W/P) 

  21. REPAIR OR REPLACE HARNESS OR CONNECTOR 
    1. Repair or replace the harness or connector.

    NEXT → REPLACE FUSE (INV W/P) 

  22. REPLACE WATER WITH MOTOR PUMP ASSEMBLY 
    1. Replace the water with motor pump assembly. Refer to COMPONENTS .

    NEXT → REPLACE FUSE (INV W/P) 

  23. CHECK CONNECTOR CONNECTION CONDITION (COOLING FAN ECU CONNECTOR) 
    1. Check the connections of the cooling fan connectors.
      Fig 18: Locating Cooling Fan ECU Connector And Cooling Fan Motor Connector
      GTY146627Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Result

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

    NG → CONNECT SECURELY 

    OK: Go to next step 

  24. CHECK CONNECTOR CONNECTION CONDITION (ECM CONNECTOR) 
    1. Check the connections of the ECM connectors.
      Fig 19: Checking Connector Connection Condition (ECM Connector)
      GTY134963Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Result

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

    NG → CONNECT SECURELY 

    OK: Go to next step 

  25. CHECK COOLING FAN MOTOR 
    1. Disconnect the cooling fan motor connector.
      Fig 20: Identifying Cooling Fan Motor Connector
      GTY145231Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Apply 12 V to the cooling fan motor and check that the cooling fan rotates.

      Result

      The cooling fan rotates.

    NG → See step   31 

    OK: Go to next step 

  26. CHECK COOLING FAN ECU 
    1. Connect the cooling fan motor connector.
      Fig 21: Identifying Cooling Fan ECU Connector
      GTY140754Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the cooling fan ECU connector.
    3. Apply 12 V to the cooling fan ECU and check that the cooling fan rotates.

      Result

      The cooling fan rotates.

    NG → REPLACE COOLING FAN ECU 

    OK: Go to next step 

  27. CHECK HARNESS AND CONNECTOR (ECM - COOLING FAN ECU) 
    1. Disconnect connector A53 from the ECM.
    2. Measure the resistance according to the value(s) in the table below.
      Fig 22: Checking Harness And Connector (ECM - Cooling Fan ECU)
      GTY124187Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard resistance (Check for open)

      Tester Connection Specified Condition
      RFC (A53-43) - SI (B3-2) Below 1 Ω
      E1 (B3-1) - Body ground Below 1 Ω

      Standard resistance (Check for short)

      Tester Connection Specified Condition
      RFC (A53-43) or SI (B3-2) - Body ground 10 kΩ or more
    3. Remove the FAN MAIN relay from the engine room R/B No. 1.
    4. Measure the resistance according to the value(s) in the table below.
      Fig 23: Identifying Cooling Fan ECU Connector Terminal
      GTY146625Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard resistance

      Tester Connection Specified Condition
      +B1 (B3-3) - Engine room R/B No. 1 FAN MAIN relay terminal 5 Below 1 Ω

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   32 

  28. REPLACE INVERTER WITH CONVERTER ASSEMBLY. Refer to  COMPONENTS 
  29. REPLACE WATER WITH MOTOR PUMP ASSEMBLY. Refer to  COMPONENTS 
  30. REPLACE HYBRID VEHICLE CONTROL ECU. Refer to  COMPONENTS 
  31. REPLACE COOLING FAN MOTOR. Refer to  COMPONENTS 
  32. REPLACE ECM. Refer to  COMPONENTS 
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