MAP Sensor Voltage vs Pressure

A Manifold Absolute Pressure (MAP) sensor lets the ECU know how much pressure is in the intake manifold at any given time. The information the MAP sensor tells the ECU is applied to tables set to deliver the proper IPW (Injector Pulse Width) and Ignition Timing. The MAP sensor will read a pressure and let the ECU know the pressure it is reading by outputting a voltage signal. If a MAP sensor is not working properly or is out of calibration, the vehicle could be experiencing drivability issues that may be misdiagnosed as a faulty injector or other injector issue. The following table is a general reference guide as to the pressure (both in kPa and in PSI) as it relates to the voltage signal.

 1 Bar MAP 2 Bar Map 3 Bar MAP
Load %MAP Voltage kPaPSI kPaPSI kPaPSI
00.00 101.5 8.81.3 3.60.5
50.25 152.2 182.6 172.5
100.50 202.9 284.1 334.8
150.75 243.5 385.5 487.0
201.00 294.2 487.0 649.3
251.25 344.9 588.4 8011.6
301.50 395.7 689.9 9613.9
351.75 436.2 7811.3 11116.1
402.00 487.0 8812.8 12718.4
452.25 537.7 9814.2 14320.7
502.50 588.4 10815.7 15923.1
552.75 629.0 11817.1 17425.2
603.00 679.7 12818.6 19027.6
653.25 7210.4 13820.0 20629.9
703.50 7711.2 14821.5 22232.2
753.75 8111.7 15822.9 23734.4
804.00 8612.5 16824.4 25336.7
854.25 9113.2 17825.8 26939.0
904.50 9613.9 18827.3 28541.3
954.75 10014.5 19828.7 30043.5
1005.00 10515.2 20830.2 31545.7