HYBRID CONTROL SYSTEM, Diagnostic DTC:P0516-769, P0517-770

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

DESCRIPTION

The thermistor assembly detects the auxiliary battery temperature. The resistance of the thermistor assembly built into the thermistor changes in accordance with changes in the auxiliary battery temperature. The lower the auxiliary battery temperature, the higher the thermistor assembly resistance. Conversely, the higher the temperature, the lower the resistance. The thermistor assembly is connected to the power management control ECU. A voltage of 5 V is supplied to the thermistor assembly from the THB terminal of the power management control ECU through its internal resistor R. This means that resistor R and the thermistor assembly 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 reduces the charging current when the auxiliary battery temperature is high to protect the auxiliary battery.

Tech Tips

Characteristics of the thermistor assembly 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)

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)

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Warning Indicate
P0516-769	Battery Temperature Sensor Circuit Low	Malfunction in the thermistor assembly circuit (short to GND) (1 trip detection logic)	Thermistor assembly Wire harness or connector Power management control ECU	Does not come on	Master Warning Light: Does not come on
P0517-770	Battery Temperature Sensor Circuit High	Malfunction in the thermistor assembly circuit (open or short to +B) (1 trip detection logic)	Thermistor assembly Wire harness or connector Power management control ECU	Does not come on	Master Warning Light: Does not come on

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Warning Indicate

P0516-769

Battery Temperature Sensor Circuit Low

Malfunction in the thermistor assembly circuit (short to GND)

(1 trip detection logic)

Thermistor assembly
Wire harness or connector
Power management control ECU

Does not come on

Master Warning Light:

Does not come on

P0517-770

Battery Temperature Sensor Circuit High

Malfunction in the thermistor assembly circuit (open or short to +B)

(1 trip detection logic)

Thermistor assembly
Wire harness or connector
Power management control ECU

Does not come on

Master Warning Light:

Does not come on

Related Data List
DTC No.	ECU Data List
P0516-769	Auxiliary Batt Temperature
P0517-770	Auxiliary Batt Temperature

WIRING DIAGRAM


*a	Thermistor Assembly
*b	Power Management Control ECU

CAUTION / NOTICE / HINT

Tech Tips

Read the freeze frame data using the GTS. 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.

After confirming that DTC P0516-769 or P0517-770 is output, use the GTS to check "Auxiliary Batt Temperature" in the Hybrid Control 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

After the repair, clear the DTCs and perform the following procedure to check that DTCs are not output.

Turn the power switch on (IG) and wait for 5 seconds or more.

PROCEDURE

CHECK CONNECTOR CONNECTION CONDITION (POWER MANAGEMENT CONTROL ECU CONNECTOR)

Check the connector connections and contact pressure of the relevant terminals for the power management control ECU connectors.

Click here

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

for LHD

for RHD

Result

Proceed to
OK
NG

CONNECT SECURELY

READ VALUE USING GTS (AUXILIARY BATT TEMPERATURE)

Connect the GTS to the DLC3.
Turn the power switch on (IG).
Enter the following menus: Powertrain / Hybrid Control / Data List / Auxiliary Batt Temperature.

Powertrain > Hybrid Control > Data List

Tester Display

Auxiliary Batt Temperature

Tester Display
Auxiliary Batt Temperature

Read the Data List.

Result

Proceed to
-40°C (-40°F)
215°C (419°F)
Same as actual temperature

Turn the power switch off.

215°C (419°F)

READ VALUE USING GTS (CHECK FOR SHORT) Click here

Same as actual temperature

CHECK FOR INTERMITTENT PROBLEMS Click here

-40°C (-40°F)

READ VALUE USING GTS (CHECK FOR OPEN)

Disconnect the Q42 thermistor assembly connector.
*a
Front view of wire harness connector

(to Thermistor Assembly)

Connect terminals 2 (THB) and 1 (E2) of the vehicle side of the Q42 thermistor assembly connector.
Connect the GTS to the DLC3.
Turn the power switch on (IG).
Enter the following menus: Powertrain / Hybrid Control / Data List / Auxiliary Batt Temperature.

Powertrain > Hybrid Control > Data List

Tester Display

Auxiliary Batt Temperature

Tester Display
Auxiliary Batt Temperature

Read the Data List.

Tester Display

Condition

Specified Condition

Auxiliary Batt Temperature

Terminals THB and E2 connected.

Power switch on (IG)

215°C (419°F)

Turn the power switch off.

Reconnect the Q42 thermistor assembly connector.

Result

Proceed to
OK
NG

REPLACE THERMISTOR ASSEMBLY

CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - THERMISTOR ASSEMBLY)

*a
Component with harness connected

(Power Management Control ECU)

Connect terminals 27 (THB) and 26 (ETHB) of the K32 power management control ECU connector.
Connect the GTS to the DLC3.
Turn the power switch on (IG).
Enter the following menus: Powertrain / Hybrid Control / Data List / Auxiliary Batt Temperature.

Powertrain > Hybrid Control > Data List

Tester Display

Auxiliary Batt Temperature

Tester Display
Auxiliary Batt Temperature

Read the Data List.

Tester Display

Condition

Specified Condition

Auxiliary Batt Temperature

Terminals THB and E2 connected.

Power switch on (IG)

215°C (419°F)

Turn the power switch off.

Result

Proceed to
OK
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

REPLACE POWER MANAGEMENT CONTROL ECU Click here

READ VALUE USING GTS (CHECK FOR SHORT)

Disconnect the Q42 thermistor assembly connector.
Connect the GTS to the DLC3.
Turn the power switch on (IG).
Enter the following menus: Powertrain / Hybrid Control / Data List / Auxiliary Batt Temperature.

Powertrain > Hybrid Control > Data List

Tester Display

Auxiliary Batt Temperature

Tester Display
Auxiliary Batt Temperature

Read the Data List.

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

Turn the power switch off.

Reconnect the Q42 thermistor assembly connector.

Result

Proceed to
OK
NG

REPLACE THERMISTOR ASSEMBLY

CHECK HARNESS AND CONNECTOR (THERMISTOR ASSEMBLY - POWER MANAGEMENT CONTROL ECU)

Disconnect the Q42 thermistor assembly connector.
Disconnect the K32 power management control ECU connector.

Front view of wire harness connector

(to Thermistor Assembly)

Rear view of wire harness connector

(to Power Management Control ECU)

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

Standard Resistance (Check for Open)

Tester Connection	Condition	Specified Condition
Q42-2 (THB) - K32-27 (THB)	Power switch off	Below 1 Ω
Q42-1 (E2) - K32-26 (ETHB)	Power switch off	Below 1 Ω

Standard Resistance (Check for Short)

Tester Connection	Condition	Specified Condition
Q42-2 (THB) or K32-27 (THB) - Body ground and other terminals	Power switch off	10 kΩ or higher
Q42-1 (E2) or K32-26 (ETHB) - Body ground and other terminals	Power switch off	10 kΩ or higher

Reconnect the K32 power management control ECU connector.

Reconnect the Q42 thermistor assembly connector.

Result

Proceed to
OK
NG

REPLACE POWER MANAGEMENT CONTROL ECU Click here

REPAIR OR REPLACE HARNESS OR CONNECTOR