AEM 30-2067 X-WiFi Wideband UEGO & EGT Controller - Manual (Page 4)

Page 4
Status Lights
The AEM X-WIFI has two status lights, see Figure 4. The warm up status light on the
left flashes during sensor warm up. Once the sensor reaches operating temperature,
usually within 30 seconds, the light will remain on. During sensor warm up, AFR
readings may not be accurate. The UEGO error status light on the right will flash if a
sensor error is detected. The status light will flash on and off a number of times,
followed by a short pause. The error codes are listed below in Table 1.
# of Flashes Fault Corrective Action
1-6 Sensor Wiring and/or sensor Check sensor cable for
broken wires/shorts
7 System voltage below 10 volts dc Check electrical system
for good connections
and proper function
UEGO Analog Output
The UEGO analog output from the AEM X-WIFI is a linear dc voltage signal that varies
from 0.5 Vdc at 8.5:1 AFR Gasoline to 4.5Vdc at 18.0:1 AFR Gasoline over the
operating range of the X-WIFI. 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.
Table 1. Error Codes
Figure 4. UEGO Status Lights
WARM UP
STATUS LIGHT
UEGO ERROR
STATUS LIGHT