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   kPa PSI   kPa PSI   kPa PSI
0 0.00   10 1.5   8.8 1.3   3.6 0.5
5 0.25   15 2.2   18 2.6   17 2.5
10 0.50   20 2.9   28 4.1   33 4.8
15 0.75   24 3.5   38 5.5   48 7.0
20 1.00   29 4.2   48 7.0   64 9.3
25 1.25   34 4.9   58 8.4   80 11.6
30 1.50   39 5.7   68 9.9   96 13.9
35 1.75   43 6.2   78 11.3   111 16.1
40 2.00   48 7.0   88 12.8   127 18.4
45 2.25   53 7.7   98 14.2   143 20.7
50 2.50   58 8.4   108 15.7   159 23.1
55 2.75   62 9.0   118 17.1   174 25.2
60 3.00   67 9.7   128 18.6   190 27.6
65 3.25   72 10.4   138 20.0   206 29.9
70 3.50   77 11.2   148 21.5   222 32.2
75 3.75   81 11.7   158 22.9   237 34.4
80 4.00   86 12.5   168 24.4   253 36.7
85 4.25   91 13.2   178 25.8   269 39.0
90 4.50   96 13.9   188 27.3   285 41.3
95 4.75   100 14.5   198 28.7   300 43.5
100 5.00   105 15.2   208 30.2   315 45.7