GSIC - Global Service Information Center

### 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

## for Preparation Click here

## 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, and 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)

1. Open or short in fuel temperature sensor circuit
2. Fuel temperature sensor
3. ECM

P0182/39

Short in fuel temperature sensor circuit for 0.5 seconds
(1 trip detection logic)

1. Open or short in fuel temperature sensor circuit
2. Fuel temperature sensor
3. ECM

P0183/39

Open in fuel temperature sensor circuit for 0.5 seconds
(1 trip detection logic)

1. Open or short in fuel temperature sensor circuit
2. Fuel temperature sensor
3. 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:

1. If DTCs related to different systems that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may have an open circuit.
2. 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 (Click here).

1.CHECK ECM (THF VOLTAGE)

1. Start the engine.

1. Measure the voltage of the ECM connector.

   Standard voltage:

     Tester Connection | Condition | Specified Condition
     E8-29 (THF) - E8-28 (E2) | Idling, intake air temperature at 20°C (68°F) | 0.5 to 3.4 V

| OK |

CHECK FOR INTERMITTENT PROBLEMS

NG |

2.INSPECT FUEL TEMPERATURE SENSOR

1. Remove the sensor.

1. 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.

| NG |

REPLACE FUEL TEMPERATURE SENSOR

OK |

3.CHECK WIRE HARNESS (ECM - FUEL TEMPERATURE SENSOR)

1. Disconnect the E8 ECM connector.

1. Disconnect the F11 sensor connector.

1. Measure the resistance of the wire harness side connectors.

   Standard resistance:

     Tester Connection | Specified Condition
     E8-29 (THF) - F11-2 (THF) | Below 1 Ω
     E8-28 (E2) - F11-1 (E2) | Below 1 Ω
     E8-29 (THF) or F11-2 (THF) - Body ground | 10 kΩ or higher
     E8-28 (E2) or F11-1 (E2) - Body ground | 10 kΩ or higher

| NG |

REPAIR OR REPLACE HARNESS AND CONNECTOR

OK |

REPLACE ECM