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Map Sensors

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