P0517

HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM: P0516-769, P0517-770: Battery Temperature Sensor Circuit Low
P0517-770 - Battery Temperature Sensor Circuit High

DESCRIPTION

- The thermistor assembly (battery temperature sensor) 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 is connected to the power management control ECU (HV CPU). A voltage of 5 V is supplied to the thermistor assembly from the THB terminal of the power management control ECU (HV CPU) 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 (HV CPU) reduces the charging current when the auxiliary battery temperature is high to protect the auxiliary battery.

HINT
Characteristics of the thermistor resistance (reference values) are as follows.

WIRING DIAGRAM

INSPECTION PROCEDURE

HINT
* Read the freeze frame data using the Techstream. In the freeze frame data, some information is recorded about the engine 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 power management control ECU Data List.

PROCEDURE

1. CHECK CONNECTOR CONNECTION CONDITION (POWER MANAGEMENT CONTROL ECU CONNECTOR) P0340-886

NG -- CONNECT SECURELY
OK -- Continue to next step.

2. READ VALUE USING TECHSTREAM (AUXILIARY BATT TEMPERATURE)

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Enter the following menus: Powertrain / Hybrid Control / Data List / Auxiliary Batt Temperature.

(d) Read the Data List.

Result:

(e) Turn the power switch off.

B -- READ VALUE USING TECHSTREAM (CHECK FOR SHORT)

C -- CHECK FOR INTERMITTENT PROBLEMS Check for Intermittent Problems
A -- Continue to next step.

3. READ VALUE USING TECHSTREAM (CHECK FOR OPEN)

(a) Disconnect connector S17 from the thermistor assembly.

(b) Connect terminals 2 (THB) and 1 (E2) of vehicle side connector S17 of the thermistor assembly.

(c) Connect the Techstream to the DLC3.

(d) Turn the power switch on (IG).

(e) Enter the following menus: Powertrain / Hybrid Control / Data List / Auxiliary Batt Temperature.

(f) Read the Data List.

OK:

Text in Illustration

(g) Turn the power switch off.

(h) Connect the thermistor assembly connector.

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

OK -- REPLACE THERMISTOR ASSEMBLY

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

(a) Connect terminals 28 (THB) and 30 (ETHB) of connector L5 of the power management control ECU.

(b) Connect the Techstream to the DLC3.

(c) Turn the power switch on (IG).

(d) Enter the following menus: Powertrain / Hybrid Control / Data List / Auxiliary Batt Temperature.

(e) Read the Data List.

OK:

Text in Illustration

(f) Turn the power switch off.

NG -- REPLACE POWER MANAGEMENT CONTROL ECU Components

OK -- REPAIR OR REPLACE HARNESS OR CONNECTOR

5. READ VALUE USING TECHSTREAM (CHECK FOR SHORT)

(a) Disconnect connector S17 from the thermistor assembly.

(f) Turn the power switch off.

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

OK -- REPLACE THERMISTOR ASSEMBLY

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

(a) Disconnect connector S17 from the thermistor assembly.

(b) Disconnect connector L5 from the power management control ECU.

Standard Resistance (Check for Short):

Text in Illustration

(d) Connect the thermistor assembly connector.

(e) Connect the power management control ECU connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE POWER MANAGEMENT CONTROL ECU Components