The Mean Absolute Pressure (MAP) sensor provides instantaneous manifold pressure information to the ECU. The data is used to calculate air density and determine the amount fuel required for optimum combustion. This sensor influences also the advancement or retardation of ignition timing. This sensor is a reliable replacement for the Mass meter type sensors.

This Aluminum model comes in 1.1 Bar, 2.5 Bar, 3 Bar and 4 Bar versions.

Operation
The Pressure Sensor requires 5 volts DC which is supplied to the sensor by the ECU. It then generates a signal from 0 to 5 volt equivalent to the pressure range of the sensor.

Sensor Location
The manifold take off point should be at a position that best represents the average manifold pressure with minimum pulsations. A filter can be fitted inline to reduce manifold pressure pulsations. Do not T-off idle or brake booster fittings etc. The take-off pipe must be direct to the manifold. When mounting the MAP sensor, face the intake port down and mount it above the take-off point. This will prevent moisture to build up so it can drain out. Ensure that the hose runs downhill all the way to the manifold if possible.

MAP sensor types
The MAP sensors available from Spitronics is the Motorola series sensors that come in two packaged styles; Sealed plastic enclosure or Aluminum machined enclosure. The MAP sensors are rated at 1.1 bar, 2.5 bar, 3 bar and 4 bar respectively. Be sure to order the correct map sensor for your application. In some cases, the vehicle’s existing MAP sensor can be used, ensure that you have the sensor wired and calibrated correctly.

Map Sensor Calibration
The MAP sensor is pre calibrated to the specifications of the 4 models. If you use another map sensor you may select custom and calibrate it yourself. Make sure you use the correct altitude pressure value from your altitude level in order for this to function correctly. Calibration needs to be done with the ECU switched on, but the engine must not be running.

Sample Sensor Pinouts