Dtc P0180 Fuel Temperature Sensor A Circuit


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING GTS (FUEL TEMPERATURE)

CHECK HARNESS AND CONNECTOR (CHECK FOR OPEN)

CHECK HARNESS AND CONNECTOR (ECM - FUEL TEMPERATURE SENSOR)

CHECK HARNESS AND CONNECTOR (CHECK FOR SHORT)

CHECK HARNESS AND CONNECTOR (ECM - FUEL TEMPERATURE SENSOR)

DTC P0180 Fuel Temperature Sensor "A" Circuit


DESCRIPTION

The fuel temperature sensor senses the fuel temperature. A thermistor built into the sensor changes the resistance value according to the fuel temperature. The lower the fuel temperature, the greater the thermistor resistance value, and the higher the fuel temperature, the lower the thermistor resistance value (See Fig. 1).
The fuel temperature sensor is connected to the ECM. The 5 V power source voltage in the ECM is applied to the fuel temperature sensor from terminal THF via a resistor R. That is, resistor R and the fuel temperature sensor are connected in series. When the resistance value of the fuel temperature sensor changes in accordance with changes in the fuel temperature, the potential at the terminal THF also changes. Based on this signal, the ECM increases the fuel injection volume to improve driveability during low engine revolution and high fuel temperature.
Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.5L-E Engine Control.Ecd System. Dtc P0180 Fuel Temperature Sensor A Circuit

DTC No.
DTC Detection Condition
Trouble Area
P0180
Open or short in fuel temperature sensor circuit for 0.5 seconds or more.
  1. Open or short in fuel temperature sensor circuit
  2. Fuel temperature sensor
  3. ECM

WIRING DIAGRAM


Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.5L-E Engine Control.Ecd System. Dtc P0180 Fuel Temperature Sensor A Circuit


INSPECTION PROCEDURE

HINT:
Read freeze frame data using the GTS. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, and other data from the time the malfunction occurred.
1.READ VALUE USING GTS (FUEL TEMPERATURE)

  1. Connect the GTS to the DLC3.

  1. Turn the ignition switch to ON and turn the GTS on.

  1. Enter the following menus: Powertrain / Engine and ECT / Data List / Fuel Temperature.

  1. Read the value.

    Result:

    Display
    		Proceed
    -40°C (-40°F)
    		A
    140°C (284°F) or more
    		B
    The same as actual fuel temperature
    		C
    HINT:
    1. If there is an open circuit, the GTS indicates -40°C (- 40°F).
    2. If there is a short circuit, the GTS indicates 140°C (284°F) or higher.


B
Go to step 4

C
CHECK FOR INTERMITTENT PROBLEMS (LandCruiser RM000000VQG00VX.html)
A


2.CHECK HARNESS AND CONNECTOR (CHECK FOR OPEN)


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.5L-E Engine Control.Ecd System. Dtc P0180 Fuel Temperature Sensor A Circuit

  1. Disconnect the fuel temperature sensor connector.

  1. Connect terminals 2 and 1 of the fuel temperature sensor connector.

  1. Connect the GTS to the DLC3.

  1. Turn the ignition switch to ON and turn the GTS on.

  1. Enter the following menus: Powertrain / Engine and ECT / Data List / Fuel Temperature.

  1. Read the value.

    OK:
    140°C (284°F) or higher
    Text in Illustration
    *1
    		Fuel Temperature Sensor
    *2
    		ECM
    *a
    		Front view of wire harness connector
    (to Fuel Temperature Sensor)


NG
Go to step 3
OK

REPLACE FUEL TEMPERATURE SENSOR

3.CHECK HARNESS AND CONNECTOR (ECM - FUEL TEMPERATURE SENSOR)

  1. Disconnect the fuel temperature sensor connector.

  1. Disconnect the ECM connector.

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

    Standard Resistance:

    Tester Connection
    		Condition
    		Specified Condition
    C85-2 - C162-23 (THF)
    		Always
    		Below 1 Ω
    C85-1 - C162-31 (ETHF)
    		Always
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE ECM (LandCruiser RM000000VW203FX.html)

4.CHECK HARNESS AND CONNECTOR (CHECK FOR SHORT)


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.5L-E Engine Control.Ecd System. Dtc P0180 Fuel Temperature Sensor A Circuit

  1. Disconnect the fuel temperature sensor connector.

  1. Connect the GTS to the DLC3.

  1. Turn the ignition switch to ON and turn the GTS on.

  1. Enter the following menus: Powertrain / Engine and ECT / Data List / Fuel Temperature.

  1. Read the value.

    OK:
    -40°C (-40°F)
    Text in Illustration
    *1
    		Fuel Temperature Sensor
    *2
    		ECM

  1. Reconnect the fuel temperature sensor connector.



NG
Go to step 5
OK

REPLACE FUEL TEMPERATURE SENSOR

5.CHECK HARNESS AND CONNECTOR (ECM - FUEL TEMPERATURE SENSOR)

  1. Disconnect the fuel temperature sensor connector.

  1. Disconnect the ECM connector.

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

    Standard Resistance:

    Tester Connection
    		Condition
    		Specified Condition
    C85-2 or C162-23 (THF) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE ECM (LandCruiser RM000000VW203FX.html)