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 hybrid vehicle control ECU assembly. A voltage of 5 V is supplied to the thermistor assembly from the THB terminal of the hybrid vehicle control ECU assembly 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 hybrid vehicle control ECU assembly 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)
B004F0CE03
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 ground)

(1 trip detection logic)

  • Thermistor assembly

  • Wire harness or connector

  • Hybrid vehicle control ECU Assembly

 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

  • Hybrid vehicle control ECU Assembly

 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

WIRING DIAGRAM

B004GMQE38
*a Thermistor Assembly
*b Hybrid Vehicle Control ECU Assembly

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 ground

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


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

PROCEDURE


  1. CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU ASSEMBLY CONNECTOR)


    1. Check the connector connections and contact pressure of the relevant terminals for the hybrid vehicle control ECU assembly connectors.

      Click here

      OK
      The connectors are connected securely and there are no contact pressure problems.
      B004GK9C01
      *A for LHD *B for RHD
      Result
      Proceed to
      OK
      NG

    NG

    CONNECT SECURELY

    OK

  2. READ VALUE USING GTS (AUXILIARY BATT TEMPERATURE)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Enter the following menus: Powertrain / Hybrid Control / Data List / Auxiliary Batt Temperature.

    4. Read the Data List.


      Powertrain > Hybrid Control > Data List
      Tester Display
      Auxiliary Batt Temperature
      Result
      Proceed to
      -40°C (-40°F)
      215°C (419°F)
      Same as actual temperature

    5. 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)

  3. READ VALUE USING GTS (CHECK FOR OPEN)


    1. B004E4S

      Disconnect the U58 thermistor assembly connector.

    2. B004EA3C34
      *a

      Front view of wire harness connector

      (to Thermistor Assembly)

      Connect terminals 2 (THB) and 1 (E2) of the U58 thermistor assembly connector.

    3. Connect the GTS to the DLC3.

    4. Turn the power switch on (IG).

    5. Enter the following menus: Powertrain / Hybrid Control / Data List / Auxiliary Batt Temperature.

    6. Read the Data List.


      Powertrain > Hybrid Control > Data List
      Tester Display
      Auxiliary Batt Temperature
      OK
      Tester Display Condition Specified Condition
      Auxiliary Batt Temperature

      Terminals U58-1 (E2) and U58-2 (THB) connected

      Power switch on (IG)

      		 215°C (419°F)

    7. Turn the power switch off.

    8. Reconnect the U58 thermistor assembly connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE THERMISTOR ASSEMBLY

    NG

    CHECK HYBRID VEHICLE CONTROL ECU ASSEMBLY Click here

  4. READ VALUE USING GTS (CHECK FOR SHORT)


    1. B004E4S

      Disconnect the U58 thermistor assembly connector.

    2. Connect the GTS to the DLC3.

    3. Turn the power switch on (IG).

    4. Enter the following menus: Powertrain / Hybrid Control / Data List / Auxiliary Batt Temperature.

    5. Read the Data List.


      Powertrain > Hybrid Control > Data List
      Tester Display
      Auxiliary Batt Temperature
      OK
      Tester Display Condition Specified Condition
      Auxiliary Batt Temperature Power switch on (IG) -40°C (-40°F)

    6. Turn the power switch off.

    7. Reconnect the U58 thermistor assembly connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE THERMISTOR ASSEMBLY

    NG

    CHECK HARNESS AND CONNECTOR (THERMISTOR ASSEMBLY - HYBRID VEHICLE CONTROL ECU ASSEMBLY) Click here

  5. CHECK HYBRID VEHICLE CONTROL ECU ASSEMBLY


    1. B004GD4C57
      *a

      Component with harness connected

      (Hybrid Vehicle Control ECU Assembly)

      Connect terminals 20 (THB) and 21 (ETHB) of the O142 hybrid vehicle control ECU assembly connector.

    2. Connect the GTS to the DLC3.

    3. Turn the power switch on (IG).

    4. Enter the following menus: Powertrain / Hybrid Control / Data List / Auxiliary Batt Temperature.

    5. Read the Data List.


      Powertrain > Hybrid Control > Data List
      Tester Display
      Auxiliary Batt Temperature
      OK
      Tester Display Condition Specified Condition
      Auxiliary Batt Temperature

      Terminals O142-20 (THB) and O142-21 (ETHB) connected

      Power switch on (IG)

      		 215°C (419°F)

    6. Turn the power switch off.

      Result
      Proceed to
      OK
      NG

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR (HYBRID VEHICLE CONTROL ECU ASSEMBLY - THERMISTOR ASSEMBLY)

    NG

    REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY Click here

  6. CHECK HARNESS AND CONNECTOR (THERMISTOR ASSEMBLY - HYBRID VEHICLE CONTROL ECU ASSEMBLY)


    1. Disconnect the U58 thermistor assembly connector.

    2. Disconnect the O142 hybrid vehicle control ECU assembly connector.

    3. B004F06C18
      *a

      Front view of wire harness connector

      (to Thermistor Assembly)
      *b

      Rear view of wire harness connector

      (to Hybrid Vehicle Control ECU Assembly)

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      U58-2 (THB) - O142-20 (THB) Power switch off Below 1 Ω
      U58-1 (E2) - O142-21 (ETHB) Power switch off Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      U58-2 (THB) or O142-20 (THB) - Body ground and other terminals Power switch off 10 kΩ or higher
      U58-1 (E2) or O142-21 (ETHB) - Body ground and other terminals Power switch off 10 kΩ or higher

    4. Reconnect the O142 hybrid vehicle control ECU assembly connector.

    5. Reconnect the U58 thermistor assembly connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR