Manifold Pressure Sensor

Manifold Pressure Sensor

Manifold Pressure Sensor

The Manifold Absolute Pressure (MAP) sensor is used to convert the manifold pressure into an electrical signal for the ECU to use. The sensor works in absolute pressures, thus its calibration is not affected by changes in barometric pressure. The vacuum - and in the case of forced air induction engines, the pressure under boost - is proportional to the load under which the engine is operating, and the ECU uses the electrical signal as a load reference. A MAP 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 signal is sampled synchronously with engine position.



On this node, the MAP sensor calibration can be loaded or entered manually. If you have purchased a MAP 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. 

Filter



This table sets the filter for the Manifold Pressure value. A higher filter will increase filtering on the signal, but will delay the value used by the ECU for calculations. A lower filter will decrease filtering on the signal improving responsiveness to the signal but may allow noise to affect the value used by the ECU for calculations.

It is recommended that this filter only be adjusted if the MAP signal acts erratically under normal operating conditions. This value is the time constant for the MAP value to make a 63% change from the old value to the new one.

Derivative Filter



This table sets the derivative filter for the Manifold Pressure value.

MAP-Derivative is used as a rate of change channel for the MAP sensor. MAP-D is used by the Boost Control when closed loop is the method and a little extra filtering here is often required for consistent operation. Typically set to around 3 to 5ms.

Display



This page sets the display settings for the Manifold Pressure channel. 

Warning Maximum

Sets the pressure at which the MAP sensor Number Displays, Gauges and Bars will enter their warning state

Display Minimum

Sets the pressure at which the MAP sensor gauge and bar displays begin. This also sets the minimum pressure allowed to be used in settings and tables.

Display Maximum

Sets the pressure at which the MAP sensor gauge and bar displays end. This also set the maximum pressure allowed to be used in settings and tables.

Diagnostics



This page allows the enabling of high and low voltage DTCs as well as Minimum and Maximum pressure DTCs for the Manifold Pressure sensor.
A DTC severity can be set for each voltage and pressure, which will trigger an Engine Protection level for the relevant setting.

Wiring



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


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