Lexus IS250 IS220d GSE20 ALE20 2AD-FHV ENGINE CONTROL SYSTEM
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.
| 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) | Battery thermometer sensor Short in battery thermometer sensor circuit 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) | Battery thermometer sensor Open in battery thermometer sensor circuit ECM |
WIRING DIAGRAM
INSPECTION PROCEDURE
- NOTICE:
- After replacing the ECM, the new ECM needs registration and initialization .
- 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 |
Disconnect the A47 battery thermometer sensor connector.
Measure the resistance of the battery thermometer sensor.
- Standard resistance:
Condition Specified Condition 24 to 26°C 1.91 to 2.05 kΩ
|
| ||||
| OK | |
| 2.CHECK HARNESS AND CONNECTOR (BATTERY THERMOMETER SENSOR - ECM) |
Check the harness and the connectors between the ECM and the battery thermometer sensor.
Disconnect the A47 battery thermometer sensor connector.
Disconnect the E59 ECM connector.
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
|
| ||||
| OK | ||
| ||