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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 P0A32-666 Drive Motor "B" Temperature Sensor Circuit Low; DTC P0A33-665 Drive Motor "B" 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. 

    Fig 1: Checking Connection Condition Of Hybrid Vehicle Control ECU Connector (Looseness And Poor Contact)
    G04111970Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: CONNECT SECURELY 

    OK: GO TO NEXT STEP 

  2. READ VALUE OF INTELLIGENT TESTER (Rr MOTOR TEMP) 
    1. Connect the intelligent tester to the DLC3.
    2. Turn the ignition switch to the ON position.
    3. Select the following menu items: DIAGNOSIS / OBD/ MOBD / HV ECU / DATA LIST / Rr MOTOR TEMP.
    4. Read the value of "Rr MOTOR TEMP" in the data list displayed on the intelligent tester.

      Result 

      Rr MOTOR TEMP

      A A B C
      Rr MOTOR TEMP (°C) -50 205 -49 to 204

      HINT:

      • If there is an open or +B short circuit, -50°C will be displayed.
      • If there is a GND short circuit, 205°C will be displayed.

    B: Go to step   6 

    C: CHECK FOR INTERMITTENT PROBLEMS 

    A: GO TO NEXT STEP 

  3. INSPECT REAR MOTOR TEMPERATURE SENSOR 
    1. Disconnect the M17 rear motor temperature sensor connector.
    2. Turn the ignition switch to the ON position.
    3. Measure the voltage according to the value(s) in the table below.

      Result 

      REAR MOTOR TEMPERATURE SENSOR

      Tester Connection Voltage Proceed to
      RMT (M17-1) - RMTG (M17-3) Approximately 5 V A
      9 to 14 V B
      Approximately 0 V C
      Fig 2: Inspecting Rear Motor Temperature Sensor
      G04111971Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT:

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

    B: Go to step 4 

    C: Go to step   5 

    A: REPLACE REAR TRACTION MOTOR W/TRANSAXLE ASSEMBLY 

  4. CHECK HARNESS AND CONNECTOR (HV CONTROL ECU - REAR MOTOR TEMPERATURE SENSOR) 
    1. Disconnect the H30 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.

      Standard Voltage 

      HV CONTROL ECU - REAR MOTOR TEMPERATURE SENSOR

      Tester Connection Specified Condition
      RMT (M17-1) - 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.
      Fig 3: Checking Harness And Connector (HV Control ECU - Rear Motor Temperature Sensor)
      G04111972Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE HYBRID VEHICLE CONTROL ECU 

  5. READ VALUE OF INTELLIGENT TESTER (Rr MOTOR TEMP) 
    1. Using SST, create a short circuit between terminals RMT (H30-21) and RMTG (H30-20) of the vehicle side connector of the HV control ECU.
    2. Turn the ignition switch to the ON position.
    3. Select the following menu items: DIAGNOSIS / OBD/ MOBD / HV ECU / DATA LIST / Rr MOTOR TEMP.
    4. Read the value of "Rr MOTOR TEMP" displayed on the intelligent tester.

      Standard: 

      Displayed temperature is 205°C 

      HINT:

      If the intelligent tester shows a temperature of -50°C, check the connection of the HV control ECU. If it is connected normally, replace the HV control ECU.

      Fig 4: Reading Value Of Intelligent Tester (Rr Motor Temp)
      G04111973Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE HYBRID VEHICLE CONTROL ECU 

    OK: REPAIR OR REPLACE HARNESS OR CONNECTOR 

  6. READ VALUE OF INTELLIGENT TESTER (Rr MOTOR TEMP) 
    1. Disconnect the M17 rear motor temperature sensor connector.
    2. Turn the ignition switch to the ON position.
    3. Select the following menu items: DIAGNOSIS / OBD/ MOBD / HV ECU / DATA LIST / Rr MOTOR TEMP.
    4. Read the value of "Rr MOTOR TEMP" displayed on the intelligent tester.

      Standard: 

      Displayed temperature is -50°C 

      HINT:

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

    OK: REPLACE REAR TRACTION MOTOR W/TRANSAXLE ASSEMBLY 

    NG: GO TO NEXT STEP 

  7. READ VALUE OF INTELLIGENT TESTER (Rr MOTOR TEMP) 
    1. Disconnect the H30 connector from the HV control ECU.
    2. Turn the ignition switch to the ON position.
    3. Select the following menu items: DIAGNOSIS / OBD/ MOBD / HV ECU / DATA LIST / Rr MOTOR TEMP.
    4. Read the value of "Rr MOTOR TEMP" displayed on the intelligent tester.

      Standard: 

      Displayed temperature is -50°C 

      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 5: Reading Value Of Intelligent Tester (Rr Motor Temp)
      G04111974Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE HYBRID VEHICLE CONTROL ECU 

    OK: REPAIR OR REPLACE HARNESS OR CONNECTOR 

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