Dtc P0180/39 Fuel Temperature Sensor A Circuit
DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
CHECK ECM (THF VOLTAGE)
INSPECT FUEL TEMPERATURE SENSOR
CHECK WIRE HARNESS (ECM - FUEL TEMPERATURE SENSOR)
DTC P0180/39 Fuel Temperature Sensor "A" Circuit |
DTC P0182/39 Fuel Temperature Sensor "A" Circuit Low Input |
DTC P0183/39 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 in the thermistor increases. When the temperature is high, the resistance decreases. The variations in resistance are communicated to the ECM as changes in voltage (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 resistor R.The resistor R and 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 voltage at terminal THF also changes. Based on this signal, the ECM corrects the pressure control compensation of the supply pump and errors.DTC No.
| DTC Detection Condition
| Trouble Area
|
P0180/39
| 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
|
P0182/39
| 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
|
P0183/39
| 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
|
- HINT:
- When DTC P0180/39, P0182/39 and/or P0183/39 is detected, check the fuel temperature by entering the following menus on the intelligent tester: Powertrain / Engine / Data List / Fuel Temperature.
Temperature Displayed
| Malfunction
|
-40°C (-40°F)
| Open circuit
|
140°C (284°F) or more
| Short circuit
|
WIRING DIAGRAM
INSPECTION PROCEDURE
- HINT:
- If DTCs related to different systems that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may have an open circuit.
- Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, and other data from the time the malfunction occurred.
- NOTICE:
- If the ECM is replaced, the new ECM needs initialization (Toyota Fortuner RM0000012X2005X.html).
| 1.CHECK ECM (THF VOLTAGE) |
Start the engine.
Measure the voltage of the ECM connector.
- Standard voltage:
Tester Connection
| Condition
| Specified Condition
|
E7-29 (THF) - E7-28 (E2)
| Idling, intake air temperature at 20°C (68°F)
| 0.5 to 3.4 V
|
| | CHECK FOR INTERMITTENT PROBLEMS |
|
|
| 2.INSPECT FUEL TEMPERATURE SENSOR |
Remove the sensor.
Measure the resistance of the sensor.
- Standard resistance:
Condition
| Specified Condition
|
Approximately 20°C (68°F)
| 2.32 to 2.59 kΩ
|
Approximately 80°C (176°F)
| 0.310 to 0.326 kΩ
|
- NOTICE:
- When checking the fuel temperature sensor in water, keep the terminals dry. After the check, wipe the sensor dry.
| | REPLACE FUEL TEMPERATURE SENSOR |
|
|
| 3.CHECK WIRE HARNESS (ECM - FUEL TEMPERATURE SENSOR) |
Disconnect the E7 ECM connector.
Disconnect the F10ensor connector.
Measure the resistance of the wire harness side connectors.
- Standard resistance:
Tester Connection
| Specified Condition
|
E7-29 (THF) - F10-2 (THF)
| Below 1 Ω
|
E7-28 (E2) - F10-1 (E2)
| Below 1 Ω
|
E7-29 (THF) or F10-2 (THF) -
Body ground
| 10 kΩ or higher
|
E7-28 (E2) or F10-1 (E2) -
Body ground
| 10 kΩ or higher
|
| | REPAIR OR REPLACE HARNESS AND CONNECTOR |
|
|
