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.	INF Code	DTC Detection Condition	Trouble Area
P0516	769	Malfunction in the thermistor assembly circuit (short to ground) (1 trip detection logic)	Thermistor assembly Wire harness or connector Power management control ECU
P0517	770	Malfunction in the thermistor assembly circuit (open or short to +B) (1 trip detection logic)

DTC No.

INF Code

DTC Detection Condition

Trouble Area

P0516

769

Malfunction in the thermistor assembly circuit (short to ground)

(1 trip detection logic)

Thermistor assembly
Wire harness or connector
Power management control ECU

P0517

770

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

(1 trip detection logic)

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

WIRING DIAGRAM

INSPECTION PROCEDURE

Tech Tips

Read the freeze frame data using the Techstream. 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 Techstream 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 ground

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)
1. 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.
NG
CONNECT SECURELY

OK

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

READ VALUE USING TECHSTREAM (AUXILIARY BATT TEMPERATURE)

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

Read the Data List.

Result

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

Turn the power switch off.

READ VALUE USING TECHSTREAM (CHECK FOR SHORT) Click here

CHECK FOR INTERMITTENT PROBLEMS Click here

READ VALUE USING TECHSTREAM (CHECK FOR OPEN)

Disconnect the O26 thermistor assembly connector.
Connect terminals 2 (THB) and 1 (E2) of vehicle side connector O26 of the thermistor assembly.
Connect the Techstream to the DLC3.
Turn the power switch on (IG).
Enter the following menus: Powertrain / Hybrid Control / Data List / 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)

Text in Illustration
*a	Front view of wire harness connector (to Thermistor Assembly)

Turn the power switch off.
Connect the thermistor assembly connector.
Reconnect the O26 thermistor assembly connector.

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

REPLACE THERMISTOR ASSEMBLY

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

Text in Illustration

*a
Component with harness connected

(Power Management Control ECU)

Connect terminals 27 (THB) and 26 (ETHB) of connector I3 of the power management control ECU.
Connect the Techstream to the DLC3.
Turn the power switch on (IG).
Enter the following menus: Powertrain / Hybrid Control / Data List / Auxiliary Batt Temperature.

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

Read the Data List.

Tester Display

Condition

Specified Condition

Auxiliary Batt Temperature

Terminals THB and ETHB connected.

Power switch on (IG)

215°C (419°F)

Turn the power switch off.

REPLACE POWER MANAGEMENT CONTROL ECU Click here

REPAIR OR REPLACE HARNESS OR CONNECTOR

READ VALUE USING TECHSTREAM (CHECK FOR SHORT)

Disconnect the O26 thermistor assembly connector.
Connect the Techstream to the DLC3.
Turn the power switch on (IG).
Enter the following menus: Powertrain / Hybrid Control / Data List / Auxiliary Batt Temperature.

Read the Data List.

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

Turn the power switch off.
Reconnect the O26 thermistor assembly connector.

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

REPLACE THERMISTOR ASSEMBLY

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

Disconnect the O26 thermistor assembly connector.

Text in Illustration
*a	Front view of wire harness connector (to Thermistor Assembly)
*b	Rear view of wire harness connector (to Power Management Control ECU)

Disconnect the I3 power management control ECU connector.

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

Standard Resistance (Check for Open)

Tester Connection	Switch Condition	Specified Condition
O26-2 (THB) - I3-27 (THB)	Power switch off	Below 1 Ω
O26-1 (E2) - I3-26 (ETHB)	Power switch off	Below 1 Ω

Standard Resistance (Check for Short)

Tester Connection	Switch Condition	Specified Condition
O26-2 (THB) or I3-27 (THB)- Body ground and other terminals	Power switch off	10 kΩ or higher
O26-1 (E2) or I3-26 (ETHB)- Body ground and other terminals	Power switch off	10 kΩ or higher

Reconnect the I3 power management control ECU connector.
Reconnect the O26 thermistor assembly connector.

REPAIR OR REPLACE HARNESS OR CONNECTOR

REPLACE POWER MANAGEMENT CONTROL ECU Click here