Lexus IS250 IS220d GSE20 ALE20 2AD-FHV ENGINE CONTROL SYSTEM
READ VALUE OF FUEL TEMPERATURE SENSOR
CHECK FUEL TEMPERATURE SENSOR (OPEN IN SENSOR)
CHECK HARNESS AND CONNECTOR (FUEL TEMPERATURE SENSOR - ECM)
CHECK FUEL TEMPERATURE SENSOR (SHORT IN SENSOR)
CHECK HARNESS AND CONNECTOR (FUEL TEMPERATURE SENSOR - ECM)
DTC P0180 Fuel Temperature Sensor "A" Circuit
DTC P0182 Fuel Temperature Sensor "A" Circuit Low Input
DTC P0183 Fuel Temperature Sensor "A" Circuit High Input
DESCRIPTION
The fuel temperature sensor monitors the fuel temperature. The fuel temperature sensor has a thermistor that varies its resistance depending on the fuel temperature. When the fuel temperature is low, the resistance of the thermistor is high. When the temperature is high, the resistance is low. The variations of resistance are communicated to the ECM as changes of voltage (see Fig. 1).
The fuel temperature sensor is connected to the ECM (see below). The 5 V power source voltage in the ECM is applied to the fuel temperature sensor from terminal THF via resistor R.
The resistor R and fuel temperature sensor are connected in series. When the resistance value of the fuel temperature sensor changes due to a change in fuel temperature, the voltage at terminal THF also changes. Based on this signal, the ECM corrects the pressure control compensation of the supply pump and determines errors.
| DTC No. | DTC Detection Condition | Trouble Area |
| P0180 | Open or short in fuel temperature sensor circuit for 0.5 seconds (1 trip detection logic) |
Open or short in fuel temperature sensor circuit Fuel temperature sensor ECM |
| P0182 | Short in fuel temperature sensor circuit for 0.5 seconds (1 trip detection logic) |
Open or short in fuel temperature sensor circuit Fuel temperature sensor ECM |
| P0183 | Open in fuel temperature sensor circuit for 0.5 seconds (1 trip detection logic) |
Open or short in fuel temperature sensor circuit Fuel temperature sensor 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.READ VALUE OF FUEL TEMPERATURE SENSOR |
Connect the intelligent tester to the DLC3.
Turn the engine switch ON (IG) and turn the intelligent tester ON.
Enter the following menus "Powertrain / Engine / Data List / Fuel Temp" and read its value displayed on the intelligent tester.
- Temperature:
- Same value as the actual fuel temperature.
- Result:
Temperature Displayed Proceed to -40°C (-40°F) A 140°C (284°F) or more B OK (Same as actual fuel temperature) C
- HINT:
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| A | |
| 2.CHECK FUEL TEMPERATURE SENSOR (OPEN IN SENSOR) |
Disconnect the E69 fuel temperature sensor connector.
Connect terminals 1 and 2 of the fuel temperature sensor wire harness side connector.
Connect the intelligent tester to the DLC3.
Turn the engine switch ON (IG) and turn the intelligent tester ON.
Enter the following menus "Powertrain / Engine / Data List / Fuel Temp" and read its value displayed on the intelligent tester.
- Standard:
- 140°C (284°F) or more
Reconnect the fuel temperature sensor connector.
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| NG | |
| 3.CHECK HARNESS AND CONNECTOR (FUEL TEMPERATURE SENSOR - ECM) |
Disconnect the E69 fuel temperature sensor connector.
Disconnect the E59 ECM connector.
Measure the resistance.
- Standard resistance:
Tester Connections Specified Conditions THF (E69-2) - THF (E59-112) Below 1 Ω EHTF (E69-1) - ETHF (E59-89)
Reconnect the fuel temperature sensor connector.
Reconnect the ECM connector.
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| OK | ||
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| 4.CHECK FUEL TEMPERATURE SENSOR (SHORT IN SENSOR) |
Disconnect the E69 fuel temperature sensor connector.
Connect the intelligent tester to the DLC3.
Turn the engine switch ON (IG) and turn the intelligent tester ON.
Enter the following menus "Powertrain / Engine / Data List / Fuel Temp" and read its value displayed on the intelligent tester.
- Standard:
- -40°C (-40°F)
Reconnect the fuel temperature sensor connector.
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| NG | |
| 5.CHECK HARNESS AND CONNECTOR (FUEL TEMPERATURE SENSOR - ECM) |
Disconnect the E69 fuel temperature sensor connector.
Disconnect the E59 ECM connector.
Measure the resistance.
- Standard resistance:
Tester Connections Specified Conditions THF (E69-2) or THF (E59-112) - Body ground 10 kΩ or higher
Reconnect the fuel temperature sensor connector.
Reconnect the ECM connector.
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| OK | ||
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