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
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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.
Tech Tips
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) 
| DTC No. | INF Code | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| P0516 | 769 | Malfunction in battery thermometer sensor circuit (short to GND) |
|
| P0517 | 770 | Malfunction in the battery thermometer sensor circuit (open or short to +B) |
WIRING DIAGRAM
INSPECTION PROCEDURE
Tech Tips
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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.
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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.
| Displayed Temperature | Malfunction |
|---|---|
| -40°C (-40°F) | Open circuit or short to +B |
| 215°C (419°F) | Short circuit or short to GND |
PROCEDURE
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CHECK CONNECTOR CONNECTION CONDITION (POWER MANAGEMENT CONTROL ECU CONNECTOR)
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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 
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READ VALUE USING INTELLIGENT TESTER (AUXILIARY BATT TEMPERATURE)
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Connect the intelligent tester to the DLC3.
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Turn the power switch on (IG).
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Enter the following menus: Powertrain / Hybrid Control / Data List / Auxiliary Batt Temperature.
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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.
B 
READ VALUE USING INTELLIGENT TESTER (CHECK FOR SHORT) Click here
C
CHECK FOR INTERMITTENT PROBLEMS Click here
A
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READ VALUE USING INTELLIGENT TESTER (CHECK FOR OPEN)
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Disconnect connector Q13 from the battery thermometer sensor.
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Connect terminals 2 (THB) and 1 (E2) of vehicle side connector Q13 of the battery thermometer sensor.
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Connect the intelligent tester to the DLC3.
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Turn the power switch on (IG).
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Enter the following menus: Powertrain / Hybrid Control / Data List / Auxiliary Batt Temperature.
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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)
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Turn the power switch off.
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Connect the battery thermometer sensor connector.
NG
CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - BATTERY THERMOMETER SENSOR) Click here
OK 
REPLACE BATTERY THERMOMETER SENSOR
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CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - BATTERY THERMOMETER SENSOR)
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Text in Illustration *a Component with harness connected
(Power Management Control ECU)
Connect terminals 28 (THB) and 30 (ETHB) of connector H3 of the power management control ECU.
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Connect the intelligent tester to the DLC3.
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Turn the power switch on (IG).
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Enter the following menus: Powertrain / Hybrid Control / Data List / Auxiliary Batt Temperature.
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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) -
Turn the power switch off.
NG
REPLACE POWER MANAGEMENT CONTROL ECU Click here
OK
REPAIR OR REPLACE HARNESS OR CONNECTOR
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READ VALUE USING INTELLIGENT TESTER (CHECK FOR SHORT)
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Disconnect connector Q13 from the battery thermometer sensor.
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Connect the intelligent tester to the DLC3.
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Turn the power switch on (IG).
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Enter the following menus: Powertrain / Hybrid Control / Data List / Auxiliary Batt Temperature.
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Read the Data List.
OK Tester Display Condition Specified Condition Auxiliary Batt Temperature Power switch on (IG) -40°C (-40°F) -
Turn the power switch off.
NG
CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - BATTERY THERMOMETER SENSOR) Click here
OK
REPLACE BATTERY THERMOMETER SENSOR
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CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - BATTERY THERMOMETER SENSOR)
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Disconnect connector Q13 from the battery thermometer sensor.
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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)
Disconnect connector H3 from the power management control ECU.
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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 -
Connect the battery thermometer sensor connector.
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Connect the power management control ECU connector.
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
REPLACE POWER MANAGEMENT CONTROL ECU Click here
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