The FRPT sensor is a diaphragm strain gauge device in which resistance changes with pressure. The electrical resistance of a strain gauge increases as pressure increases, and the resistance decreases as the pressure decreases. The varying resistance affects the voltage drop across the sensor terminals and provides electrical signals to the PCM corresponding to pressure.
Strain gauge type sensors are considered passive sensors. A passive sensor is connected to a voltage divider network so that varying the resistance of the passive sensor causes a variation in total current flow. Voltage that is dropped across a fixed resistor in series with the sensor resistor determines the voltage signal at the PCM. This voltage signal is equal to the reference voltage minus the voltage drop across the fixed resistor.
The FRPT sensor measures the pressure of the fuel near the fuel injectors. This signal is used by the PCM to adjust the fuel injector pulse width and meter fuel to each engine combustion cylinder.
Removal & Installation
- Release the fuel system pressure.
- Disconnect the battery ground cable.
- Disconnect the fuel rail pressure and temperature sensor electrical connector.
- Disconnect the vacuum hose from the fuel rail pressure and temperature sensor.
Remove the 2 bolts and the fuel rail pressure and temperature sensor.
- To install, tighten to 53 inch lbs. (6 Nm).
- To install, reverse the removal procedure.
- Inspect the O-ring seal and install new as necessary.
- Lubricate the O-ring seal with clean engine oil.
FRPT Sensor Pin testing
This pinpoint test is intended to diagnose the following: