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Home >> Toyota >> 2015 >> Prius C One >> Repair and Diagnosis >> Hybrid/Electric Powertrain >> Testing and Diagnosis >> Hybrid Control System (Diagnostic Codes (P0069-273 - P0A38-257)) >> Hybrid Control System >> DTC P0A38-257: Generator Temperature Sensor Circuit Low; DTC P0A39-259: Generator Temperature Sensor Circuit High [12/2014 - ] >> Procedure

DTC P0A38-257: Generator Temperature Sensor Circuit Low; DTC P0A39-259: Generator Temperature Sensor Circuit High [12/2014 - ]: Procedure

  1. CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU CONNECTOR) See step   1 

    NG → CONNECT SECURELY 

    OK: Go to next step 

  2. READ VALUE USING TECHSTREAM (MOTOR TEMP NO2) 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON (IG).
    3. Enter the following menus: Powertrain / Hybrid Control / Data List / Motor Temp No2.
    4. Read the Data List.

      Result

      Result Proceed to
      -40°C (-40°F) A
      215°C (419°F) B
      Same as actual temperature C
    5. Turn the ignition switch off.

    B → See step   5 

    C → See step   9 

    A: Go to next step 

  3. READ VALUE USING TECHSTREAM (CHECK FOR OPEN) 
    1. Disconnect the generator temperature sensor connector.
      GTY324464Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Connect terminals 4 (GMT) and 8 (GMTG) of vehicle side connector C24 of the generator temperature sensor.
      GTY340266Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Connect the Techstream to the DLC3.
    4. Turn the ignition switch to ON (IG).
    5. Enter the following menus: Powertrain / Hybrid Control / Data List / Motor Temp No2.
    6. Read the Data List.

      OK

      Tester Display Condition Specified Condition
      Motor Temp No2 Terminals GMT and GMTG connected.
      Ignition switch ON (IG)      		 215°C (419°F)
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Generator Temperature Sensor)

      HINT: 

      The generator temperature sensor is not available separately. If it requires replacement, replace the hybrid vehicle transaxle assembly.

    7. Turn the ignition switch off.
    8. Connect the generator temperature sensor connector.

    NG → See step   4 

    OK → See step   8 

  4. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - GENERATOR TEMPERATURE SENSOR) 
    1. Connect terminals 26 (GMT) and 27 (GMTG) of connector A38 of the hybrid vehicle control ECU.
      GTY321184Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Connect the Techstream to the DLC3.
    3. Turn the ignition switch to ON (IG).
    4. Enter the following menus: Powertrain / Hybrid Control / Data List / Motor Temp No2.
    5. Read the Data List.

      OK

      Tester Display Condition Specified Condition
      Motor Temp No2 Terminals GMT and GMTG connected.
      Ignition switch ON (IG)      		 215°C (419°F)
      TEXT IN ILLUSTRATION

      *a Component with harness connected
      (Hybrid Vehicle Control ECU)
    6. Turn the ignition switch off.

    NG → See step   7 

    OK → REPAIR OR REPLACE HARNESS OR CONNECTOR 

  5. READ VALUE USING TECHSTREAM (CHECK FOR SHORT) 
    1. Disconnect the generator temperature sensor connector.
      GTY324464Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Connect the Techstream to the DLC3.
    3. Turn the ignition switch to ON (IG).
    4. Enter the following menus: Powertrain / Hybrid Control / Data List / Motor Temp No2.
    5. Read the Data List.

      OK

      Tester Display Condition Specified Condition
      Motor Temp No2 Ignition switch ON (IG) -40°C (-40°F)

      HINT: 

      The generator temperature sensor is not available separately. If it requires replacement, replace the hybrid vehicle transaxle assembly.

    6. Turn the ignition switch off.
    7. Connect the generator temperature sensor connector.

    NG → See step   6 

    OK → See step   8 

  6. CHECK HARNESS AND CONNECTOR (GENERATOR TEMPERATURE SENSOR - HYBRID VEHICLE CONTROL ECU) 
    1. Disconnect the generator temperature sensor connector.
    2. Disconnect connector A38 from the hybrid vehicle control ECU.
    3. Measure the resistance according to the value(s) in the table below.
      GTY332459Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance (Check for Open)

      Tester Connection Switch Condition Specified Condition
      C24-4 (GMT) - A38-26 (GMT) Ignition switch off Below 1 Ω
      C24-8 (GMTG) - A38-27 (GMTG) Ignition switch off Below 1 Ω

      Standard Resistance (Check for Short)

      Tester Connection Switch Condition Specified Condition
      C24-4 (GMT) or A38-26 (GMT) - Body ground and other terminals Ignition switch off 10 kΩ or higher
      C24-8 (GMTG) or A38-27 (GMTG) - Body ground and other terminals Ignition switch off 10 kΩ or higher
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Generator Temperature Sensor)
      *b Rear view of wire harness connector
      (to Hybrid Vehicle Control ECU)
    4. Connect the hybrid vehicle control ECU connector.
    5. Connect the generator temperature sensor connector.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   7 

  7. REPLACE HYBRID VEHICLE CONTROL ECU. Refer to  COMPONENTS [12/2014 - ] 
  8. REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY. Refer to  COMPONENTS [12/2014 - ] 
  9. CHECK FOR INTERMITTENT PROBLEMS. Refer to  CHECK FOR INTERMITTENT PROBLEMS [12/2014 - ] 
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