AEM XWiFi Wideband UEGO EGT Controller 302067 User Manual

							 
 
 
 
AEM Performance Electronics 2205 126th Street Unit A, Hawthorne, CA. 90250 Phone: (310) 484-2322 Fax: (310) 484-0152 http://www.aemelectronics.com Instruction Part Number: 10-2320 Rev 01  2009 AEM Performance Electronics 
 
Part Number 30-2320  
AEM X-WIFI UEGO/EGT Module 
Figure 1.  Wiring Schematic 
AEM X-WIFI Parts 
1 x 30-2320 X-WIFI Module  
1 x 30-2001 UEGO Sensor 
1 x 35-8535 Install Kit (UEGO Bung and 6 Butt Connectors) 
1 x 10-2320 Installation Instructions 
1 x 35-3416 8-Pin Power Harness 
1 x 35-3400 6-Pin UEGO Sensor Harness 
1 x 35-3009 USB Cable 
4 x Zip Tie  
						

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INSTALLATION 
 
1. Disconnect the negative battery cable. 
2. Find a suitable, in cab, mounting location and secure the X-WIFI module using 
the supplied zip ties.  Note: The X-WIFI is not weatherproof and should not be 
mounted in the engine bay or exposed to outside elements 
3. Plug the 8-pin power harness into the mating connector on the right side of the X-
WIFI and connect the wires as shown in Figure 1.   
4. Mount the UEGO sensor as shown in figure 3. 
5. Connect the sensor to the X-WIFI using the 6-wire sensor cable.  The connector 
with the grey latch connects to the sensor.  The single-row connector connects to 
the left side of the  X-WIFI.   
6. Mount the optional EGT sensor(s) as shown in Figure 6.   
7. Slide the heat shrink tube over the sensor cable and connect the EGT to the 
cable as shown below in Figure 7. 
8. Connect the 3-pin EGT sensors cable(s) to the X-WIFI. 
 
RED - Connect to a switched, fused (5A) 12 volt power source. 
 
BLACK – Connect to a clean power ground. 
 
*BLUE - Connect to available 5 volt analog channel for EGT input. 
 
*GREY - Connect to available 5 volt analog channel for EGT input. 
  
*WHITE - Connect to Lambda + Input. 
 
*BROWN - Connect to sensor  ground.  (Must  be  connected  if the  White, Grey,  or  blue 
wire is used) 
 
*optional – only needed if using the available differential analog output  
 
Wiring notes: 
GREY – The GREY wire should be connected to an available analog channel on the 
EMS or similar device. 
 
BLUE – The BLUE wire should be connected to an available analog channel on the 
EMS or similar device. 
 
WHITE – The WHITE wire should be connected to the Lambda + input on the EMS or 
the analog + input on a similar device. 
 
BROWN – The BROWN wire should be connected to the Lambda – input or the analog 
– input.  If the EMS or similar device does not have a – input, the BROWN wire should 
be connected to a sensor ground.  If no sensor ground is available, the BROWN wire 
should be connected to a power ground.  Note: The BROWN wire must be connected 
in order to get correct readings from the analog outputs. 
 
 
 
  
						

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Displaying Data with WIFI Enabled Electronic Devices 
 
Real time AFR and EGT data from the X-WIFI can be viewed on WIFI enabled 
electronic devices using a standard web browser.  Locate the network “AEM X-WIFI” 
and connect.  Type the address 192.168.3.88 in the address bar of the browser and 
open the web page.  A screen showing the AFR and EGT values will appear as shown 
below in Figure 2.  If a UEGO sensor error is detected, the AFR value will display “Err” 
followed by a number.  The number corresponds to the number of flashes on the error 
status light as described in the Status Lights section below.  Visit the video gallery at 
www.aemelectronics.com for information on configuring specific WIFI enabled mobile 
electronic devices. 
 
 
 
 
 
UEGO Sensor Mounting 
 
A weld-in M18 X 1.5 UEGO bung is supplied for sensor installation. Mount the UEGO 
sensor in the exhaust system at least 18 inches downstream from the exhaust port. If 
you anticipate high EGTs (over 800C), run a turbocharger, run at high RPM for 
extended periods of time or plan on running leaded race fuel then you must mount the 
sensor at least 36 inches or more downstream of the exhaust port as all of these can 
cause the sensor to overheat. On turbocharged engines the UEGO sensor must be 
installed after the turbo charger, if not, the pressure differential will greatly affect 
the accuracy of the unit. For accurate readings, the sensor must be mounted before 
catalytic converters and/or auxiliary air pumps. To prevent collection of liquids between 
the sensor housing and sensor element during the cold start phase, the installation 
angle should be inclined at least 10° from horizontal with the electrical connection 
upwards, see Figure 3.   
 
 
 
 
>10° 
FIGURE 2.  Web Page Data 
Figure 3. Minimum mounting angle for the UEGO Sensor  
						

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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  
						

							Page 5 
 
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 
 
 
 
 
Configuring the AEM EMS 
 
With an EMS calibration open, go to Setup>Sensors>Oxygen Sensor #1(2)>O2 Sensor 
#1(2) Cal Table>Table, and enter the values below into the O2 Sensor #1(2) Cal Table. 
 
Voltage AFR Voltage AFR Voltage AFR Voltage AFR 
0.00 8.43 1.40 10.64 2.81 13.99 4.21 17.31 
0.16 8.43 1.56 11.02 2.96 14.34 4.37 17.69 
0.31 8.43 1.72 11.40 3.12 14.72 4.52 18.05 
0.47 8.43 1.87 11.75 3.28 15.10 4.68 18.05 
0.62 8.79 2.03 12.13 3.43 15.46 4.84 18.05 
0.78 9.17 2.18 12.49 3.59 15.84 4.99 18.05 
0.94 9.55 2.34 12.87 3.74 16.20 NA NA 
1.09 9.90 2.50 13.25 3.90 16.58 NA NA 
1.25 10.28 2.65 13.61 4.06 16.96 NA NA 
 
 
 
Connect the WHITE Analog Output + wire to the EMS Lambda input and the BROWN 
Analog Output – wire to the EMS sensor ground.   Table 3 below lists the Lambda and 
Sensor ground pin locations for the different EMS part numbers. 
 
 
 
 
Table 2. EMS Software Values 
Table 2.  AFR Values  
						

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AEM EMS P/N 
Lambda 
#1 Pin 
Lambda 
#2 Pin 
Sensor 
GND Pin 
30-1000/1001/1002/1040/1042 D14 D16 D21 
30-1010/1012/1050/1052 C16 A23 C18 
30-1020/1060 D7 D14 D12 
30-1030/1031/1070 C13 C14 A16 
30-1080 C16 C8 C14 
30-1081 C16 B11 C14 
30-1100/1101 B47 B48 B65 
30-1110 1C 9C 13C 
30-1120/1121/1130 B6 B14 B9 
30-1220 30 31 60 
30-1300 4 66 17 
30-1310/1311/1312/1313 76 75 92 
30-1320 71 73 34 
30-1400 29 43 46 
30-1401 44 43 46 
30-1510 C2-31 C2-33 C2-32 
30-1600/1601/1602/1603 19 NA 21 
30-1610/1611/1612 46 52 50 
30-1620/1621/1622/1623 29 55 30 
30-1710 2N 4J 2C 
30-1720 C3 D3 O3 
30-1800 C3 A2 D4 
30-1810 D19 B17 B19 
30-1820/1821 A26 D25 C35 
30-6100/30-6101 B47 B48 B65 
30-6010/6012/6050/6052 C16 A23 C18 
30-6000/6001/6002/6040/6042 D14 D16 D21 
30-6060 D7 D14 D12 
30-6310/30-6311/30-6313 76 75 92 
30-6320 71 73 34 
 
 
 
Configuring the AEM F/IC 
 
With an FIC calibration open, go to Setup>Aux Gauge, and complete the Aux gauge 
setup window as shown below in Figure 5. 
 
 
 
 
 
 
 
 
Table 3. EMS Pin Locations  
						

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Connect the WHITE Analog Output + wire to the Aux Gauge input and the BROWN 
Analog Output – wire to the sensor ground.  Table 4 below lists the Lambda and Sensor 
ground pin locations for the different FIC part numbers. 
 
AEM F/IC P/N Lambda Pin Sensor GND Pin 
30-1910(X) Pin 18 of 22-pin connector Pin 5 of 22-pin connector 
30-1930(X) 
Pin 18 of 22-pin connector 
Pin 20 of 20-pin connector Pin 5 of 22-pin connector 
 
 
 
Thermocouple Mounting 
 
The optional thermocouple comes with a stainless steel compression style mounting 
adapter.  The mounting adapter consists of three pieces:  compression nut, ferrule 
sleeve, threaded body.  The threaded body has 1/8” NPT male threads.  To install the 
sensor, the threaded body can either be threaded into a hole with mating 1/8” NPT 
threads, or welded to the pipe/manifold.   Remove the compression nut, ferrule sleeve, 
and thermocouple from the threaded body.   For a welded installation, drill a 13/32” hole 
and weld the threaded body, being careful not to cause any distortion.  .  For a threaded 
installation, either thread the body into an existing hole with 1/8” NPT threads or drill a 
hole using an “R” size drill bit and cut the threads using a 1/8” NPT tap.  With the 
compression nut and ferrule sleeve on the thermocouple, insert the thermocouple into 
the threaded body so the tip of the thermocouple is near the center of the pipe/manifold 
and tighten the compression nut to the threaded body.  See Figure 6.  Table 5 below 
lists some of the common EGT measurements and corresponding thermocouple 
mounting locations. 
 
Figure 5.  F/IC Aux Gauge Setup 
Table 4.  F/IC Pin Locations  
						

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EGT Measurement Mounting Location 
Individual Cylinder EGT 1-2 inches from exhaust port 
Turbine Inlet Temperature 2-3 inches from turbine inlet 
Cylinder Bank EGT Header collector 
 
 
 
  When using both thermocouples for comparison (bank 1 EGT and bank 2 EGT for 
example), make sure to mount both thermocouples in a similar fashion (distance from 
port, tip depth, tube diameter, etc) so the readings are not influenced by installation 
differences.   
 
 
 
 
 
Connecting the Thermocouple 
 
Slide the supplied heat shrink onto the sensor cable.  Connect the RED wire from the 
thermocouple to the RED wire on the harness and the YELLOW wire from the 
thermocouple to the YELLOW wire on the harness using the supplied 4-40 screws and 
hex nuts.  Make sure the connections are not touching.  Center the heat shrink over the 
connections and apply mild heat to the heat shrink until it shrinks over the connections. 
See Figure 7. 
 
 
 
 
 
EGT Analog Outputs 
FERRULE SLEEVE 
COMPRESSION NUT 
THREADED BODY 
PIPE/MANIFOLD 
WITH 1/8” NPT 
THREADS OR 
13/32” HOLE 
TIP OF THERMOCOUPLE 
NEAR CENTER OF 
PIPE/MANIFOLD 
HEAT SHRINK 
Figure 7.  Thermocouple to Cable Connection 
Figure 6.  Thermocouple Mounting 
Table 5.  Common Thermocouple Mounting Locations  
						

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The analog EGT outputs from the AEM X-WIFI are linear dc voltage signals that vary 
from 0.5 Vdc at 0 Degrees Fahrenheit (-18 Degrees Celsius) to 4.5Vdc at 1800 
Degrees Fahrenheit (982 Degrees Celsius) over the operating range of the X-WIFI.  
The signals are used for sending information to a data logger or an engine management 
system like the AEM EMS or F/IC.  The transfer functions for the analog outputs are 
listed below in Degrees Fahrenheit and Degrees Celsius.   
 
Temperature (Degrees Fahrenheit) = 450 * Voltage - 225 
 
For example, if the output is 2.5 Vdc, the temperature is 900 Degrees Fahrenheit. 
 
450 * 2.5 – 225 = 900 Degrees Fahrenheit 
 
Temperature (Degrees Celsius) = 250 * Voltage – 143 
 
For example, if the output is 2.5 Vdc, the temperature is 482 Degrees Celsius. 
 
250 * 2.5 – 143 = 482 Degrees Celsius 
 
A list of output voltages and corresponding temperatures is shown below in Table 6. 
 
 
VOLTAGE °F °C 
0.50 0 -18 
0.75 113 45 
1.00 225 107 
1.25 338 170 
1.50 450 232 
1.75 563 295 
2.00 675 357 
2.25 788 420 
2.50 900 482 
2.75 1013 545 
3.00 1125 607 
3.25 1238 670 
3.50 1350 732 
3.75 1463 795 
4.00 1575 857 
4.25 1688 920 
4.50 1800 982 
 
 
 
Configuration 
 
The AEM X-WIFI has two configuration buttons.  Configuration button one is used for 
accessing the WIFI setup options.  Configuration button two is used for future updates.  
See Figure 8. 
 
 
Table 6. Analog EGT Calibrations  
						

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WIFI 
 
AEM X-WIFI is preconfigured for adhoc communications with standard WIFI settings 
that are suitable for most applications.  The IP address, subnet mask, and SSID are 
listed below: 
 IP address: 192.168.3.88 
 Subnet Mask: 255.255.0.0 
 SSID: AEM X-WIFI 
The default X-WIFI settings are permanently stored in the module and can be restored 
by the following sequence.  Plug the USB cable into the pc/laptop.  Press and hold 
configuration button 1.  With configuration button 1 depressed, plug the USB cable into 
the X-WIFI and continue to hold configuration button 1 for eight seconds then release.   
 
The AEM X-WIFI is also capable of secure infrastructure WIFI communications.  The 
communication settings are configurable in the advanced configuration window.  The 
advanced configuration window can be viewed using a standard hyper terminal 
communication.  The settings for the hyper terminal communication are shown below in 
Figure 9. 
Figure 8.  Configuration Buttons 
CONFIGURATION 
BUTTON 1 
CONFIGURATION 
BUTTON 2