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Home >> Lexus >> 2007 >> RX 400h AWD >> Repair and Diagnosis >> Hybrid/Electric Powertrain >> Testing and Diagnosis >> Hybrid Vehicle Control (P310) - RX400H - DTC P0336-137 Through P0A72-326 >> DTC P0A38-257 Generator Temperature Sensor Circuit Low; DTC P0A39-259 Generator Temperature Sensor Circuit High >> Inspection Procedure

Inspection Procedure

  1. CHECK CONNECTION CONDITION OF HYBRID VEHICLE CONTROL ECU CONNECTOR (LOOSENESS AND POOR CONTACT) 
    1. Check the connections of all HV control ECU connectors.

      OK: Connectors are connected securely and there is no poor connection. 

    NG: CONNECT SECURELY 

    Fig 1: Identifying HV Control ECU Connectors
    G05201226Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to next step 

  2. INSPECT HYBRID VEHICLE CONTROL ECU 
    1. Turn the ignition switch to the ON position. Measure the voltage according to the value (s) in the table below.

      Result 

      DTC RESULT DESCRIPTION

      Tester Connection Voltage Proceed to
      GMT (H32-22) - GMTG (H32-32) Approximately 0 V A
      9 to 14 V B

    A: GO TO step   5 

    Fig 2: Identifying Hybrid Vehicle Control ECU
    G05278442Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    B: Go to next step 

  3. CHECK HARNESS AND CONNECTOR (+B SHORT) 
    1. Disconnect the H32 connector from the HV control ECU.
    2. Turn the ignition switch to the ON position.
    3. Measure the voltage according to the value (s) in the table below.

      Result 

      DTC RESULT DESCRIPTION

      Tester Connection Voltage Proceed to
      GMT (H32-22) - GMTG (H32-32) Approximately 0 V A
      9 to 14 V B
      NOTE: Turning the ignition switch to the ON position with the HV control ECU connectors disconnected causes other DTCs to be stored. Clear the DTCs after performing the inspection.
    Fig 3: Checking Harness And Connector (+B Short)
    G05278443Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    A: REPLACE HYBRID VEHICLE CONTROL ECU 

    B: Go to next step 

  4. CHECK HARNESS AND CONNECTOR (+B SHORT) 
    1. Remove the w/ converter inverter. (See INVERTER WITH CONVERTER )
    2. Disconnect the H32 connector from the HV control ECU.
    3. Disconnect the M13 generator temperature sensor connector.
    4. Turn the ignition switch to the ON position.
      Fig 4: Locating Generator Temperature Sensor Connector
      G05201323Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    5. Measure the voltage according to the value (s) in the table below.

      Standard Voltage 

      TESTER CONNECTION AND SPECIFIED CONDITION

      Tester Connection Specified Condition
      GMT (M13-4) - Body ground Approximately 0 V
      NOTE: Turning the ignition switch to the ON position with the HV control ECU connectors disconnected causes other DTCs to be stored. Clear the DTCs after performing the inspection.

      HINT:

      The generator temperature sensor is not available as a single product. If it requires replacement, replace the HV transaxle assembly.

    Fig 5: Identifying Generator Temperature Sensor Connector Terminals
    G05278445Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY 

  5. INSPECT GENERATOR TEMPERATURE SENSOR 
    1. Disconnect the H32 connector from the HV control ECU.
    2. Measure the resistance according to the value (s) in the table below.

      Standard Resistance 

      TESTER CONNECTION AND SPECIFIED CONDITION

      Tester Connection Resistance Temperature
      GMT (H32-22) - GMTG (H32-32) 142.6 to 184.1 kΩ 0°C (32°F)
      44.2 to 54.4 kΩ 25°C (77°F)
      16.2 to 19.1 kΩ 50°C (122°F)
      3.1 to 3.5 kΩ 100°C (212°F)
    3. Measure the resistance according to the value (s) in the table below.

      Standard Resistance 

      TESTER CONNECTION AND SPECIFIED CONDITION

      Tester Connection Specified Condition
      GMT (H32-22) or GMTG (H32-32) - Body ground 10 kΩ or higher
    Fig 6: Disconnecting H32 Connector From HV Control ECU
    G05278443Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE HYBRID VEHICLE CONTROL ECU 

    NG: Go to next step 

  6. CHECK HARNESS AND CONNECTOR (HV CONTROL ECU - GENERATOR TEMPERATURE SENSOR) 
    1. Remove the w/ converter inverter. (See INVERTER WITH CONVERTER )
    2. Disconnect the H32 connector from the HV control ECU.
    3. Disconnect the M13 generator temperature sensor connector.
    4. Measure the resistance according to the value (s) in the table below.

      Standard Resistance 

      TESTER CONNECTION AND SPECIFIED CONDITION

      Tester Connection Specified Condition
      GMT (H32-22) - GMT (M13-4) Below 1 Ω
      GMTG (H32-32) - GMTG (M13-9) Below 1 Ω
    5. Measure the resistance according to the value (s) in the table below.

      Standard Resistance 

      TESTER CONNECTION AND SPECIFIED CONDITION

      Tester Connection Specified Condition
      GMT (H32-22) or GMTG (H32-32) - Body ground 10 kΩ or higher

      HINT:

      The generator temperature sensor is not available as a single product. If it requires replacement, replace the HV transaxle assembly.

    Fig 7: Checking Harness And Connector (HV Control ECU - Generator Temperature Sensor)
    G05278447Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY 

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