Dtc P0516 Battery Temperature Sensor Circuit Low

Engine. Lexus Is250, Is220D. Gse20 Ale20
2Ad-Fhv Engine Control System. Lexus Is250, Is220D. Gse20 Ale20

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT BATTERY THERMOMETER SENSOR

CHECK HARNESS AND CONNECTOR (BATTERY THERMOMETER SENSOR - ECM)

DTC P0516 Battery Temperature Sensor Circuit Low

DTC P0517 Battery Temperature Sensor Circuit High


DESCRIPTION

The battery thermometer sensor is installed on the battery cover to detect battery temperature.
A thermistor is integrated into the battery thermometer sensor, and the resistance of the battery thermometer sensor changes according to the battery temperature.
The resistance of the thermistor in the battery thermometer sensor decreases as the battery temperature increases. The resistance increases as the temperature decreases.
The battery thermometer sensor is connected to the ECM. The ECM supplies 5 V from the THB terminal to the battery thermometer sensor through resistor R.
The battery thermometer sensor and resistor R are connected in series. This results in changes in the voltage supplied from the THB terminal when the resistance changes according to the battery temperature.
The ECM determines the battery temperature according to changes of voltage. When the battery temperature is high, the ECM determines to reduce the amount of current supplied from the generator in order to protect the battery.
Lexus Is250, Is220D. Gse20 Ale20.2Ad-Fhv Engine Control System.Ecd System. Dtc P0516 Battery Temperature Sensor Circuit Low

DTC No.
DTC Detection Condition
Trouble Area
P0516
Battery thermometer sensor output value is 0.2 V or less for 0.5 seconds or more with the engine switch ON (IG).
(1 trip detection logic)
  1. Battery thermometer sensor
  2. Short in battery thermometer sensor circuit
  3. ECM
P0517
Battery thermometer sensor output value is 4.8 V or more for 0.5 seconds or more with the engine switch ON (IG).
(1 trip detection logic)
  1. Battery thermometer sensor
  2. Open in battery thermometer sensor circuit
  3. ECM

WIRING DIAGRAM


Lexus Is250, Is220D. Gse20 Ale20.2Ad-Fhv Engine Control System.Ecd System. Dtc P0516 Battery Temperature Sensor Circuit Low


INSPECTION PROCEDURE

NOTICE:
After replacing the ECM, the new ECM needs registration (Click here) and initialization (Click here).
HINT:
If DTCs relating to different systems are output, and they share terminal E2 as their ground, check this ground circuit first.
1.INSPECT BATTERY THERMOMETER SENSOR


    Lexus Is250, Is220D. Gse20 Ale20.2Ad-Fhv Engine Control System.Ecd System. Dtc P0516 Battery Temperature Sensor Circuit Low

  1. Disconnect the A47 battery thermometer sensor connector.

  1. Measure the resistance of the battery thermometer sensor.

    Standard resistance:
    Condition
    		Specified Condition
    24 to 26°C
    		1.91 to 2.05 kΩ


NG
REPLACE BATTERY THERMOMETER SENSOR
OK


2.CHECK HARNESS AND CONNECTOR (BATTERY THERMOMETER SENSOR - ECM)


    Lexus Is250, Is220D. Gse20 Ale20.2Ad-Fhv Engine Control System.Ecd System. Dtc P0516 Battery Temperature Sensor Circuit Low

  1. Check the harness and the connectors between the ECM and the battery thermometer sensor.

    1. Disconnect the A47 battery thermometer sensor connector.

    2. Disconnect the E59 ECM connector.

    3. Measure the resistance between the wire harness side connectors.

      Standard resistance (Check for open):
      Tester Connection
      		Specified Condition
      THB (A47-1) - THB (E59-115)
      		Below 1 Ω
      ETHB (A47-2) - ETHB (E59-92)
      		Below 1 Ω
      Standard resistance (Check for short):
      Tester Connection
      		Specified Condition
      THB (A47-1) or THB (E59-115) - Body ground
      		10 kΩ or higher
      ETHB (A47-2) or ETHB (E59-92) - Body ground
      		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE ECM