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 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 battery thermometer sensor 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.

WIRING DIAGRAM

INSPECTION PROCEDURE

HINT
- 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.

PROCEDURE

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

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.

C -- CHECK INTERMITTENT PROBLEMS Check for Intermittent Problems

B -- READ VALUE USING TECHSTREAM (CHECK FOR SHORT)
A -- Continue to next step.

3. READ VALUE USING TECHSTREAM (CHECK FOR OPEN)

(a) Disconnect connector Q13 from the battery thermometer sensor.

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

(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 battery thermometer sensor connector.

NG -- CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - BATTERY THERMOMETER SENSOR)

OK -- REPLACE BATTERY THERMOMETER SENSOR

4. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - BATTERY THERMOMETER SENSOR)

(a) Connect terminals 28 (THB) and 30 (ETHB) of connector H3 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 Q13 from the battery thermometer sensor.

(f) Turn the power switch off.

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

OK -- REPLACE BATTERY THERMOMETER SENSOR

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

(a) Disconnect connector Q13 from the battery thermometer sensor.

(b) Disconnect connector H3 from the power management control ECU.

Standard Resistance (Check for Short):

Text in Illustration

(d) Connect the battery thermometer sensor connector.

(e) Connect the power management control ECU connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE POWER MANAGEMENT CONTROL ECU Components