DTC    P0A38-257    Generator Temperature Sensor Circuit Low

DTC    P0A39-259    Generator Temperature Sensor Circuit High

for Preparation Click here


DESCRIPTION

Refer to the circuit description for DTC P0A2C-247. (Click here)

DTC No.
INF Code
DTC Detection Condition
Trouble Area
P0A38
257
GND short in generator temperature sensor circuit
  1. Wire harness or connector
  2. HV control ECU
  3. Hybrid vehicle transaxle assembly (Generator temperature sensor)
P0A39
259
Open or +B short in generator temperature sensor circuit
  1. Wire harness or connector
  2. HV control ECU
  3. Hybrid vehicle transaxle assembly (Generator temperature sensor)

HINT:
After confirming that DTC P0A38-257 or P0A39-259 is output, use the intelligent tester to check "MOTOR 1 TEMP" in the HV system ECU data list.


Displayed Temperature
Malfunction
-50°C
Open or +B short circuit
205°C
GND short

WIRING DIAGRAM


A113954E05


INSPECTION PROCEDURE

1.CHECK CONNECTION CONDITION OF HYBRID VEHICLE CONTROL ECU CONNECTOR (LOOSENESS AND POOR CONTACT)


    A103658E18

  1. Check the connections of all HV control ECU connectors.

    OK:
    Connectors are connected securely and there is no poor connection.



NG
CONNECT SECURELY
OK


2.INSPECT HYBRID VEHICLE CONTROL ECU


    A103658E41

  1. Turn the ignition switch to the ON position. Measure the voltage according to the value(s) in the table below.

    Result:
    Tester Connection
    		Voltage
    		Proceed to
    GMT (H34-22) - GMTG (H34-32)
    		Approximately 0 V
    		A
    9 to 14V
    		B



A
Go to step 5
B


3.CHECK HARNESS AND CONNECTOR (+B SHORT)


    A103659E04

  1. Disconnect the H34 connector from the HV control ECU.

  1. Turn the ignition switch to the ON position.

  1. Measure the voltage according to the value(s) in the table below.

    Result:
    Tester Connection
    		Voltage
    		Proceed to
    GMT (H34-22) - GMTG (H34-32)
    		Approximately 0 V
    		A
    9 to 14V
    		B

    NOTICE:
    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


4.CHECK HARNESS AND CONNECTOR (+B SHORT)

  1. Remove the w/ converter inverter. (Click here)

  1. Disconnect the H34 connector from the HV control ECU.



    A105167

  1. Disconnect the M6 generator temperature sensor connector.

  1. Turn the ignition switch to the ON position.



    A113787E04

  1. Measure the voltage according to the value(s) in the table below.

    Standard Voltage:
    Tester Connection
    		Specified Condition
    GMT (M6-4) - Body ground
    		Approximately 0 V

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



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY 

5.INSPECT GENERATOR TEMPERATURE SENSOR


    A103659E04

  1. Disconnect the H34 connector from the HV control ECU.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Resistance
    		Temperature
    GMT (H34-22) - GMTG (H34-32)
    		142.6 to 184.1 kΩ
    		0°C
    44.2 to 54.4 kΩ
    		25°C
    16.2 to 19.1 kΩ
    		50°C
    3.1 to 3.5 kΩ
    		100°C

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Specified Condition
    GMT (H34-22) or MMTG (H34-32) - Body ground
    		10 kΩ or higher



NG
REPLACE HYBRID VEHICLE CONTROL ECU
NG


6.CHECK HARNESS AND CONNECTOR (HV CONTROL ECU - GENERATOR TEMPERATURE SENSOR)

  1. Remove the w/ converter inverter. (Click here)

  1. Disconnect the H34 connector from the HV control ECU.

  1. Disconnect the M6 generator temperature sensor connector.



    A113787E05

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Specified Condition
    GMT (H34-22) - GMT (M6-4)
    		Below 1 Ω
    GMTG (H34-32) - GMTG (M6-9)
    		Below 1 Ω

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Specified Condition
    GMT (H34-22) or GMTG (H34-32) - Body ground
    		10 kΩ or higher

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



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY