AEM 30-2310 Inline Wideband UEGO Controller User Manual
Page 4
Page 4
UEGO Analog Output
The analog output from the Inline Wideband UEGO controller is a linear dc voltage
signal that varies from 0.5 Vdc at 8.5:1 AFR Gasoline (0.58 Lambda) to 4.5Vdc at
18.0:1 AFR Gasoline (1.22 Lambda) over the operating range of the controller. The
signal is used for sending information to a data logger or an engine management
system like the AEM EMS or F/IC. The transfer function for the output is listed below.
AFR = 2.375(V) + 7.3125
For example, if the output is 2.0 Vdc, the AFR is 12.06:1
2.375 * 2.0 + 7.3125 = 12.06
A table showing the analog output voltage and corresponding Air/Fuel ratios for some of
the common fuels is shown below in Table 2.
VOLTS
LAMBDA
AFR GAS
AFR
METHANOL
AFR E85
AFR
ETHANOL
0.50
0.58
8.5
3.7
5.6
5.2
0.71
0.61
9.0
3.9
5.9
5.5
0.92
0.65
9.5
4.1
6.3
5.8
1.13
0.68
10.0
4.4
6.6
6.1
1.34
0.71
10.5
4.6
6.9
6.4
1.55
0.75
11.0
4.8
7.3
6.7
1.76
0.78
11.5
5.0
7.6
7.0
1.97
0.82
12.0
5.2
7.9
7.3
2.18
0.85
12.5
5.4
8.2
7.7
2.39
0.88
13.0
5.7
8.6
8.0
2.61
0.92
13.5
5.9
8.9
8.3
2.82
0.95
14.0
6.1
9.2
8.6
3.03
0.99
14.5
6.3
9.6
8.9
3.11
1.00
14.7
6.4
9.7
9.0
3.24
1.02
15.0
6.5
9.9
9.2
3.45
1.05
15.5
6.7
10.2
9.5
3.66
1.09
16.0
7.0
10.6
9.8
3.87
1.12
16.5
7.2
10.9
10.1
4.08
1.16
17.0
7.4
11.2
10.4
4.29
1.19
17.5
7.6
11.5
10.7
4.50
1.22
18.0
7.8
11.9
11.0
Table 2. AFR Values
Inline Wideband UEGO/AEM EMS Configuration
With an EMS calibration open, go to Setup>Sensors>Oxygen Sensor #1(2)>O2 Sensor
#1(2) Cal Table>Table, and enter the values shown in Table 3 below into the O2 Sensor
#1(2) Cal Table.