DTC P0A38-257: Generator Temperature Sensor Circuit Low; DTC P0A39-259: Generator Temperature Sensor Circuit High: Procedure

NG → CONNECT SECURELY 

OK: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON.
3. Enter the following menus: Powertrain / Hybrid Control / Data List / Motor Temp No2.
4. Read the Data List.

   Result

   Result	Proceed to
   -40°F (-40°C)	A
   419°F (215°C)	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 

1. Disconnect the generator temperature sensor connector.
   Fig 1: Checking Connector Connection Condition (Generator Resolver Connector)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Connect terminals 4 (GMT) and 9 (GMTG) of vehicle side connector B59 of the generator temperature sensor.
   Fig 2: Checking For Open In Generator Temperature Sensor

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Connect the Techstream to the DLC3.
4. Turn the ignition switch to ON.
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	419°F (215°C)

   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 

1. Connect terminals 26 (GMT) and 27 (GMTG) of connector A65 of the hybrid vehicle control ECU.
   Fig 3: Checking Harness And Connector (Hybrid Vehicle Control ECU - Generator Temperature Sensor)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Connect the Techstream to the DLC3.
3. Turn the ignition switch to ON.
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	419°F (215°C)

   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 

1. Disconnect the generator temperature sensor connector.
   Fig 4: Checking Connector Connection Condition (Generator Resolver Connector)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Connect the Techstream to the DLC3.
3. Turn the ignition switch to ON.
4. Enter the following menus: Powertrain / Hybrid Control / Data List / Motor Temp No2.
5. Read the Data List.

   OK

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

   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.

NG → See step   6 

OK → See step   8 

1. Disconnect the generator temperature sensor connector.
2. Disconnect connector A65 from the hybrid vehicle control ECU.
3. Measure the resistance according to the value(s) in the table below.
   Fig 5: Checking Harness And Connector (Hybrid Vehicle Control ECU - Generator Temperature Sensor)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance (Check for Open)

   Tester Connection	Switch Condition	Specified Condition
   B59-4 (GMT) - A65-26 (GMT)	Ignition switch off	Below 1 Ω
   B59-9 (GMTG) - A65-27 (GMTG)	Ignition switch off	Below 1 Ω

   Standard Resistance (Check for Short)

   Tester Connection	Switch Condition	Specified Condition
   B59-4 (GMT) or A65-26 (GMT) - Body ground and other terminals	Ignition switch off	10 kΩ or higher
   B59-9 (GMTG) or A65-27 (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