DTC    P0A38-257    Generator Temperature Sensor Circuit Low

DTC    P0A39-259    Generator Temperature Sensor Circuit High

for Preparation Click here


DESCRIPTION

Refer to the description for DTC P0A37-260 (Click here).

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

HINT:
After confirming that DTC P0A38-257 or P0A39-259 is output, use the intelligent tester to check "Motor Temp No2" in the power management control ECU Data List.


Displayed Temperature
Malfunction
-40°C (-40°F)
Open circuit or short to +B
215°C (419°F)
Short circuit or short to GND

WIRING DIAGRAM


A159825E22


INSPECTION PROCEDURE

1.CHECK CONNECTOR CONNECTION CONDITION (POWER MANAGEMENT CONTROL ECU CONNECTOR)


  1. Check the connections of the power management control ECU connectors.


    A237663E01


    Text in Illustration 
    *A
    		for LHD
    		*B
    		for RHD

    OK:
    The connectors are connected securely and there are no contact problems.



NG
CONNECT SECURELY
OK


2.READ VALUE USING INTELLIGENT TESTER (MOTOR TEMP NO2)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the power switch on (IG).

  1. Enter the following menus: Powertrain / Hybrid Control / Data List / Motor Temp No2.

  1. Read the Data List.

    Result:
    Result
    		Proceed to
    -40°C (-40°F)
    		A
    215°C (419°F)
    		B
    Same as actual temperature
    		C

  1. Turn the power switch off.



B
Go to step 5

C
CHECK FOR INTERMITTENT PROBLEMS (Click here)
A


3.READ VALUE USING INTELLIGENT TESTER (CHECK FOR OPEN)


    A240800

  1. Disconnect the generator temperature sensor connector.



    A217045E02

  1. Connect terminals 4 (GMT) and 8 (GMTG) of vehicle side connector D7 of the generator temperature sensor.

  1. Connect the intelligent tester to the DLC3.

  1. Turn the power switch on (IG).

  1. Enter the following menus: Powertrain / Hybrid Control / Data List / Motor Temp No2.

  1. Read the Data List.

    OK:
    Tester Display
    		Condition
    		Specified Condition
    Motor Temp No2
    		Terminals GMT and GMTG connected.
    Power 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.

  1. Turn the power switch off.

  1. Connect the generator temperature sensor connector.



NG
Go to step 4
OK

REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY (Click here)  

4.CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - GENERATOR TEMPERATURE SENSOR)


    A249277E13

  1. Connect terminals 26 (GMT) and 27 (GMTG) of connector A19 of the power management control ECU.

  1. Connect the intelligent tester to the DLC3.

  1. Turn the power switch on (IG).

  1. Enter the following menus: Powertrain / Hybrid Control / Data List / Motor Temp No2.

  1. Read the Data List.

    OK:
    Tester Display
    		Condition
    		Specified Condition
    Motor Temp No2
    		Terminals GMT and GMTG connected.
    Power switch on (IG)
    		215°C (419°F)

    Text in Illustration 
    *a
    		Component with harness connected
    (Power Management Control ECU)

  1. Turn the power switch off.



NG
REPLACE POWER MANAGEMENT CONTROL ECU (Click here)
OK

REPAIR OR REPLACE HARNESS OR CONNECTOR 

5.READ VALUE USING INTELLIGENT TESTER (CHECK FOR SHORT)


    A240800

  1. Disconnect the generator temperature sensor connector.

  1. Connect the intelligent tester to the DLC3.

  1. Turn the power switch on (IG).

  1. Enter the following menus: Powertrain / Hybrid Control / Data List / Motor Temp No2.

  1. Read the Data List.

    OK:
    Tester Display
    		Condition
    		Specified Condition
    Motor Temp No2
    		Power 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.

  1. Turn the power switch off.



NG
Go to step 6
OK

REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY (Click here)  

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

  1. Disconnect the generator temperature sensor connector.

  1. Disconnect connector A19 from the power management control ECU.



    A217254E04

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

    Standard Resistance (Check for Open):
    Tester Connection
    		Switch Condition
    		Specified Condition
    D7-4 (GMT) - A19-26 (GMT)
    		Power switch off
    		Below 1 Ω
    D7-8 (GMTG) - A19-27 (GMTG)
    		Power switch off
    		Below 1 Ω

    Standard Resistance (Check for Short):
    Tester Connection
    		Switch Condition
    		Specified Condition
    D7-4 (GMT) or A19-26 (GMT) - Body ground and other terminals
    		Power switch off
    		10 kΩ or higher
    D7-8 (GMTG) or A19-27 (GMTG) - Body ground and other terminals
    		Power 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 Power Management Control ECU)

  1. Connect the power management control ECU connector.

  1. Connect the generator temperature sensor connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE POWER MANAGEMENT CONTROL ECU (Click here)