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Home >> Lexus >> 2007 >> RX 400h FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 925 (Hybrid Vehicle Control (P310) - RX400H - DTC P0336-137 Through P0A32-666) >> DTC P0A2C-247 Drive Motor "A" Temperature Sensor Circuit Low; DTC P0A2D-249 Drive Motor "A" Temperature Sensor Circuit High >> Inspection Procedure

Inspection Procedure

WARNING: This page is about a different car, the 2006 Lexus RX 400h. However, it is still accessible from the selected car via links, so may be relevant.
  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. 

      2. Fig 1: Checking Connection Condition Of Hybrid Vehicle Control ECU Connector (Looseness And Poor Contact)
      G04111963Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: CONNECT SECURELY 

    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 

      HYBRID VEHICLE CONTROL ECU

      Tester Connection Voltage Proceed to
      MMT (H32-26) - MMTG (H32-33) Approximately 0 or 5 V A
      9 to 14V B
      Fig 2: Inspecting Hybrid Vehicle Control ECU
      G04111964Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    A: Go to step   5 

    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: 

      +B SHORT

      Tester Connection Voltage Proceed to
      MMT (H32-26) - MMTG (H32-33) Approximately 0 V A
      9 to 14V B
      Fig 3: Checking Harness And Connector (+B Short)
      G04111965Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      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.

    A: REPLACE HYBRID VEHICLE CONTROL ECU 

    B: GO TO NEXT STEP 

  4. CHECK HARNESS AND CONNECTOR (+B SHORT) 
    1. Disconnect the H32 connector from the HV control ECU.
    2. Disconnect the M15 motor temperature sensor connector.
    3. Turn the ignition switch to the ON position.
    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage 

      +B SHORT

      Tester Connection Specified Condition
      MMT (M15-1) or MMT (H32-26) - 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 motor temperature sensor is not available as a single product. If it requires replacement, replace the HV transaxle assembly.

      Fig 4: Checking Harness And Connector (+B Short)
      G04111966Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY 

  5. INSPECT MOTOR 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 

      MOTOR TEMPERATURE SENSOR (1 OF 2)

      Tester Connection Resistance Temperature
      MMT (H32-26) - MMTG (H32-33) 142.6 k to 184.1 kΩ 0°C (32°F)
      44.2 k to 54.4 kΩ 25°C (77°F)
      16.2 k to 19.1 kΩ 50°C (122°F)
      3.3 k to 3.5 kΩ 100°C (212°F)
      Fig 5: Inspecting Motor Temperature Sensor
      G04111967Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

      MOTOR TEMPERATURE SENSOR (2 OF 2)

      Tester Connection Specified Condition
      MMT (H32-26) or MMTG (H32-33) - Body ground 10 kΩ or higher

    OK: REPLACE HYBRID VEHICLE CONTROL ECU 

    NG: GO TO NEXT STEP 

  6. CHECK HARNESS AND CONNECTOR (HV CONTROL ECU - MOTOR TEMPERATURE SENSOR) 
    1. Disconnect the H32 connector from the HV control ECU.
    2. Disconnect the M15 motor temperature sensor connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

      HV CONTROL ECU - MOTOR TEMPERATURE SENSOR (1 OF 2)

      Tester Connection Specified Condition
      MMT (H32-26) - MMT (M15-1) Below 1 Ω
      MMTG (H32-33) - MMTG (M15-3) Below 1 Ω

      Standard Resistance 

      HV CONTROL ECU - MOTOR TEMPERATURE SENSOR (2 OF 2)

      Tester Connection Specified Condition
      MMT (H32-26) or MMTG (H32-33) - Body ground 10 kΩ or higher

      HINT:

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

    Fig 6: Checking Harness And Connector (HV Control ECU - Motor Temperature Sensor)
    G04111968Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY 

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