Fuel Pressure Sensor

Fuel Pressure Sensor


A Fuel Pressure Sensor can be used with your ECU for datalogging, injector pressure differential tuning and for Engine Protection purposes. A Fuel Pressure Sensor is a powered sensor that typically has three wires; a 5V+ power wire, a signal wire to the ECU, and a Signal Ground. This sensor is generally mounted in the engines fuel rail or fuel pressure regulator, and measures the fuel pressure acting on the fuel injectors.

Using the Fuel Pressure Sensor, the ECU can calculate the Injector Pressure Differential based on the current Fuel Pressure vs Intake Manifold Pressure, taking into account the Fuel Pressure Input Type. This allows for accurate modelling of flow through the fuel injector at varying pressures both in the fuel rail and intake manifold.

Fuel Pressure Sensor Configuration




On this node, the Fuel Pressure sensor calibration can be loaded or entered manually. If you have purchased a Fuel Pressure sensor from Haltech, calibrations can be loaded directly into the calibration table by using the 'Load from File' button. Calibrations can be saved to file by using the 'Save to File' button. 

Display


This node sets the minimum and maximum values for the number and gauge displays.

Diagnostics


This node allows the enabling of high and low voltage DTCs as well as a 'deadband' operating pressure DTC for the Expected Fuel Pressure.


A DTC severity can be set for the minimum and maximum voltage, which will trigger an Engine Protection level for the relevant setting.

Fuel Pressure Safety

The last setting enables the Fuel Pressure Safety system, and is used in conjunction with the settings found in the 'Fuel Tuning' node.

Deadband value - this is the maximum deviation Fuel Pressure is allowed above or below Fuel Pressure Expected before the Fuel Pressure Safety system is activated.
      Fuel Pressure Expected is a calculated channel based on the current Manifold Pressure, Fuel Pressure Input Type, and Base Fuel Pressure channels. 
      Eg, If Fuel Pressure Input Type is set to 'MAP Reference', Base Fuel Pressure is set to 300kPa, and the current Manifold Pressure is 100kPaG, the Fuel Pressure Expected channel will equal 400kPa (base pressure plus MAP). If the Fuel Pressure Sensor value at that time is 320kPa and the Deadband Value is set to 50kPa (and the preconditions are met), the Fuel Pressure Safety system will activate. Similarly, if the Fuel Pressure Sensor value at that time is 480kPa, the Fuel Pressure Safety system will activate.
Precondition - Choose between MAP, TPS, or both as a load condition for the system to operate.
Minimum MAP/Minimum TPS - Sets the threshold for the precondition chosen above.
DTC Severity - Sets the level of Engine Protection severity when the Fuel Pressure Safety system triggers.

Wiring



This node allows you to assign the input for the Fuel Pressure sensor. 
Fuel Pressure Sensors use an Analog Input. Any available AVI can be used.
It is recommended to disable the Pull Up.



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