DTC    P0516-769    Battery Temperature Sensor Circuit Low
DTC    P0517-770    Battery Temperature Sensor Circuit High

for Preparation Click here

DESCRIPTION

1. The battery thermometer sensor detects the auxiliary battery temperature. The resistance of the battery thermometer sensor built into the thermistor changes in accordance with changes in the auxiliary battery temperature. The lower the auxiliary battery temperature, the higher the battery thermometer sensor resistance. Conversely, the higher the temperature, the lower the resistance. The thermistor is connected to the power management control ECU (HV CPU). A voltage of 5 V is supplied to the battery thermometer sensor from the THB terminal of the power management control ECU (HV CPU) through its internal resistor R. This means that resistor R and the battery thermometer sensor are connected in series. The voltage at the THB terminal and the resistance value change in accordance with changes in the auxiliary battery temperature. Based on this signal, the power management control ECU (HV CPU) reduces the charging current when the auxiliary battery temperature is high to protect the auxiliary battery.
   
   

   HINT:

   Characteristics of the battery thermometer sensor resistance (reference values) are as follows.

   
   

   Terminal	THB (with Connector Disconnected)	Resistance	Ambient Temperature
   THB - E2	4.5 to 5.5 V	3.00 to 3.73 kΩ	Approximately 10°C (50°F)
   		1.60 to 1.80 kΩ	Approximately 25°C (77°F)
   		0.80 to 1.00 kΩ	Approximately 40°C (104°F)

   
   
   
   
   
   

WIRING DIAGRAM

INSPECTION PROCEDURE

HINT:

1. Read the freeze frame data using the intelligent tester. In the freeze frame data, some information is recorded about the vehicle conditions at the moment a malfunction occurred. This information can be helpful when troubleshooting.
   
2. After confirming that DTC P0516-769 or P0517-770 is output, use the intelligent tester to check "Auxiliary Batt Temperature" in the Hybrid Control Data List.
   

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

   
   
   
   
   

   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

1. Connect the intelligent tester to the DLC3.
   

2. Turn the power switch on (IG).
   

3. Enter the following menus: Powertrain / Hybrid Control / Data List / Auxiliary Batt Temperature.
   

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 power switch off.
   

B	Go to step 5
C	CHECK FOR INTERMITTENT PROBLEMS (Click here)

A

1. Disconnect connector Q13 from the battery thermometer sensor.
   

2. Connect terminals 2 (THB) and 1 (E2) of vehicle side connector Q13 of the battery thermometer sensor.
   

3. Connect the intelligent tester to the DLC3.
   

4. Turn the power switch on (IG).
   

5. Enter the following menus: Powertrain / Hybrid Control / Data List / Auxiliary Batt Temperature.
   

6. Read the Data List.
   

   OK:

   Tester Display	Condition	Specified Condition
   Auxiliary Batt Temperature	Terminals THB and E2 connected. Power switch on (IG)	215°C (419°F)

   Text in Illustration 

   *a	Front view of wire harness connector (to Battery Thermometer Sensor)

7. Turn the power switch off.
   

8. Connect the battery thermometer sensor connector.
   

NG	Go to step 4

OK
REPLACE BATTERY THERMOMETER SENSOR

1. Connect terminals 28 (THB) and 30 (ETHB) of connector H3 of the power management control ECU.
   

2. Connect the intelligent tester to the DLC3.
   

3. Turn the power switch on (IG).
   

4. Enter the following menus: Powertrain / Hybrid Control / Data List / Auxiliary Batt Temperature.
   

5. Read the Data List.
   

   OK:

   Tester Display	Condition	Specified Condition
   Auxiliary Batt Temperature	Terminals THB and ETHB connected. Power switch on (IG)	215°C (419°F)

   Text in Illustration 

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

6. Turn the power switch off.
   

NG	REPLACE POWER MANAGEMENT CONTROL ECU (Click here)

OK
REPAIR OR REPLACE HARNESS OR CONNECTOR

1. Disconnect connector Q13 from the battery thermometer sensor.
   

2. Connect the intelligent tester to the DLC3.
   

3. Turn the power switch on (IG).
   

4. Enter the following menus: Powertrain / Hybrid Control / Data List / Auxiliary Batt Temperature.
   

5. Read the Data List.
   

   OK:

   Tester Display	Condition	Specified Condition
   Auxiliary Batt Temperature	Power switch on (IG)	-40°C (-40°F)

6. Turn the power switch off.
   

NG	Go to step 6

OK
REPLACE BATTERY THERMOMETER SENSOR

1. Disconnect connector Q13 from the battery thermometer sensor.
   

2. Disconnect connector H3 from the power management control ECU.
   

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

   Standard Resistance (Check for Open):

   Tester Connection	Switch Condition	Specified Condition
   H3-28 (THB) - Q13-2 (THB)	Power switch off	Below 1 Ω
   H3-30 (ETHB) - Q13-1 (E2)	Power switch off	Below 1 Ω

   Standard Resistance (Check for Short):

   Tester Connection	Switch Condition	Specified Condition
   H3-28 (THB) or Q13-2 (THB) - Body ground and other terminals	Power switch off	10 kΩ or higher
   H3-30 (ETHB) or Q13-1 (E2) - Body ground and other terminals	Power switch off	10 kΩ or higher

   Text in Illustration 

   *a	Front view of wire harness connector (to Battery Thermometer Sensor)
   *b	Rear view of wire harness connector (to Power Management Control ECU)

4. Connect the battery thermometer sensor connector.
   

5. Connect the power management control ECU connector.
   

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK
REPLACE POWER MANAGEMENT CONTROL ECU (Click here)