Table of contents: Examination ↓ Replacement ↓
Some models since 1995 include a fuel temperature sensor. The sensor measures the temperature of the fuel inside the gas tank and is a thermistor whose resistance changes inversely proportional to the temperature. The sensor is attached to the fuel flow sensor assembly placed inside the tank. The information received from the sensor is used by the PCM for diagnostic purposes. Sensor failures result in the entry of a corresponding fault code in the OBD memory (see section On-Board Diagnostics (OBD) System - Operating Principle and Error Codes).
Examination
Note: Performing the following procedure may cause a fault to be stored in the OBD memory and the Check Engine Light to be illuminated. Once the check and any necessary repairs have been completed, be sure to clear the system memory (see section On-Board Diagnostics (OBD) System - Operating Principle and Error Codes).
1. Remove the rear seat and the fuel pump/flow sensor assembly access cover (see Chapter Power and exhaust systems).
2. Verify that the power supply to the fuel temperature sensor is correct. Disconnect the wiring from the fuel flow/temperature sensor assembly. Connect the positive probe of the voltmeter to the pink/blue wire terminal on the connector, and the negative probe to the black wire terminal. With the ignition on, the reading should be 5.0 V, otherwise, check the condition of the wiring in the circuit sections between the sensor and the PCM/ground. If the wiring is correct, drive the vehicle to a service station for diagnosis of the control module and appropriate repair.
3. Using an ohmmeter, measure the resistance between the two terminals of the fuel temperature sensor. At room temperature (20°C), the sensor resistance should be 2300÷2700 Ohm. A more accurate check of the sensor's proper functioning can be made by removing it from the car and placing it in a vessel with water heated over a fire. Compare the measurement results with the resistance change map. A faulty sensor must be replaced.
Replacement
1. Remove the fuel flow sensor assembly from the tank (see Chapter Power and exhaust systems).
(Data posted on the website: «www.NissanBook.ru»)
2. Remove the fuel temperature sensor from the assembly.
3. Installation is carried out in reverse order.