P0A39

P311 HYBRID VEHICLE CONTROL: HYBRID CONTROL SYSTEM: P0A38-257,P0A39-259: Generator Temperature Sensor Circuit Low

DTC P0A38-257 - Generator Temperature Sensor Circuit Low

DTC P0A39-259 - Generator Temperature Sensor Circuit High

DESCRIPTION

The resistance of the thermistor built into the motor temperature sensor changes in accordance with changes in MG2 temperature. The lower the MG2 temperature, the more the thermistor resistance. Conversely, the more the temperature, the lower the resistance.









HINT: After confirming that DTC P0A2C-247 or P0A2D-249 is output, use the Techstream to check "Motor Temp No1" in the HV ECU data list.





HINT: After confirming that DTC P0A38-257 or P0A39-259 is output, use the Techstream to check "Motor Temp No2" in the HV ECU data list.





WIRING DIAGRAM





INSPECTION PROCEDURE
CAUTION:
- Before inspecting the high-voltage system or disconnecting the low voltage connector of the inverter with converter assembly, take safety precautions such as wearing insulated gloves and removing the service plug grip to prevent electrical shocks. After removing the service plug grip, put it in your pocket to prevent other technicians from accidentally reconnecting it while you are working on the high-voltage system.
- After disconnecting the service plug grip, wait for at least 10 minutes before touching any of the high-voltage connectors or terminals. After waiting for 10 minutes, check the voltage at the terminals in the inspection point in the inverter with converter assembly. The voltage should be 0 V before beginning work.
HINT: Waiting for at least 10 minutes is required to discharge the high-voltage capacitor inside the inverter with converter assembly.

PROCEDURE

1. CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU CONNECTOR) P0343
NG -- CONNECT SECURELY
OK -- Continue to next step.
2. CHECK CONNECTOR CONNECTION CONDITION (GENERATOR TEMPERATURE SENSOR CONNECTOR)
(a) Check the connections of the generator temperature sensor connector.
OK:
The connector is connected securely and there are no contact problems.
NG -- CONNECT SECURELY
OK -- Continue to next step.
3. READ VALUE USING TECHSTREAM (MOTOR TEMP NO2)
(a) Turn the power switch on (IG).
(b) Select the following menu items: Powertrain / Hybrid Control / Data List / Motor Temp No2.
(c) Read the data list.
Result:






C -- CHECK FOR INTERMITTENT PROBLEMS
B -- READ VALUE USING TECHSTREAM (MOTOR TEMP NO2)
A -- Continue to next step.
4. READ VALUE USING TECHSTREAM (MOTOR TEMP NO2)




(a) Disconnect the C59 generator temperature sensor connector.
(b) Connect terminals 4 and 9 of the generator temperature sensor wire harness side connector.
(c) Turn the power switch on (IG).
(d) Select the following menu items: Powertrain / Hybrid Control / Data List / Motor Temp No2.
(e) Read the data list.
Displayed temperature:
205°C (401°F) or more
OK -- REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY
NG -- Continue to next step.
5. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - GENERATOR TEMPERATURE SENSOR)
(a) Disconnect the A61 hybrid vehicle control ECU connector.
(b) Turn the power switch on (IG).




(c) Measure the voltage according to the value(s) in the table below.
Standard voltage:





NOTICE: Turning the power switch on (IG) with the hybrid vehicle control ECU connectors disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.
(d) Turn the power switch off.
(e) Disconnect the generator temperature sensor connector.
(f) Measure the resistance according to the value(s) in the table below.
Standard resistance (Check for open):






Standard resistance (Check for short):






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE HYBRID VEHICLE CONTROL ECU
6. READ VALUE USING TECHSTREAM (MOTOR TEMP NO2)
(a) Disconnect the generator temperature sensor connector.
(b) Turn the power switch on (IG).
(c) Select the following menu items: Powertrain / Hybrid Control / Data List / Motor Temp No2.
(d) Read the data list.
Displayed temperature:
-50°C (-58°F)
OK -- REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY
NG -- Continue to next step.
7. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - GENERATOR TEMPERATURE SENSOR)
(a) Disconnect the A61 hybrid vehicle control ECU connector.
(b) Disconnect the C59 generator temperature sensor connector.




(c) Measure the resistance according to the value(s) in the table below.
Standard resistance (Check for open):






Standard resistance (Check for short):






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE HYBRID VEHICLE CONTROL ECU