AEM Digital Wideband UEGO Gauge 304110 User Manual

							ADVANCED ENGINE MANAGEMENT INC. 
2205 126th Street Unit A, Hawthorne, CA. 90250 
Phone: (310) 484-2322 Fax: (310) 484-0152 
http://www.aemelectronics.com  
Instruction Part Number: 10-4110 Rev 140520 
 2014 Advanced Engine Management, Inc. 
 
 
Page 1 
 
 
 
Installation Instructions for 
30-4110 
Gauge-Type UEGO Controller 
 
 
 
 
WARNING:
!
This installation is not for the electrically or mechanically 
challenged! Use this sensor with EXTREME caution! If you are 
uncomfortable with anything about this, please refer the 
installation to an AEM trained tuning shop or call 800-423-0046 
for technical assistance. You should also visit the AEM 
Performance Electronics Forum at http://www.aempower.com 
 
NOTE: AEM holds no responsibility for any engine damage that 
results from the misuse of this product!
 
 
This product is legal in California for racing vehicles only and should 
never be used on public highways. 
 
 
  
						

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AEM Gauge-Type UEGO Controller Parts 
1 x UEGO Gauge Assembly 
1 x UEGO Sensor 
1 x O2 Sensor Bung 
4 x Butt Connectors 
1 x Installation Instruction 
1 x 4 Lead Harness 
1 x UEGO Sensor Harness 
1 x Silver Bezel 
1 x Black Lambda Faceplate 
1 x White AFR Faceplate 
 
Replacement Wideband Controller Components 
30-2004  Replacement Bosch LSU49 Sensor 
35-3441  96” Wideband LSU49 UEGO Sensor Replacement Cable 
35-3401  36” Wideband UEGO Power Replacement Cable 
35-4005 Mild Steel Oxygen Sensor Bung (welding required) 
35-4001 Mild Steel Sensor Bung Plug 
30-4008  Stainless Steel Tall Finned Oxygen Sensor Bung (welding required) 
 
 
 
 
Congratulations! The 52mm (2-1/16”) AEM Universal Exhaust Gas Oxygen (UEGO) 
Gauge features a digital readout and sweeping 24 color-coded light emitting diode 
(LED) display, providing immediate reference to the engine air fuel ratio (or lambda) in 
real-time. The AEM gauge is ideal for all vehicles including carbureted applications and 
engine dynamometers. A user-selectable 0-5V analog output is included and can be 
used with data loggers as well as most Electronic Fuel Injection (EFI) systems including 
the AEM Engine Management System (EMS). A serial data stream is also integrated for 
air fuel (or lambda) ratio output to a RS-232 com port.  
 
 
Because the AEM gauge utilizes the internal AEM UEGO controller and Bosch UEGO 
Sensor, it is accurate and repeatable to 0.1 of an air/fuel ratio point! With this, there is 
no abrupt oscillation as found in many competitor gauges, which utilize a narrow band 
oxygen sensor detecting only stoichiometry.  
 
 
 
 
 
 
 
 
 
 
 
 
 
  
						

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Typical production vehicle oxygen sensors rely on “Nernst Cell” technology, commonly 
called “Narrow Band” and sometimes erroneously described as “Wide Band”. This is a 
very cost effective method that outputs a voltage based on the oxygen content of the 
gas being sampled. It is accurate in the region surrounding stoichiometric operation and 
leaner. Unfortunately, in the rich region where high performance engines usually 
operate, their accuracy and repeatability is virtually non-existent. (Figure 1) 
 
 
Figure 1. Characteristic curve of a Nernst Cell O2 Sensor 
 
The rich region output of narrow band O2 sensors is temperature dependent, which 
renders it useless if an accuracy better than 1.5:1 AFR is desired. This is immediately 
obvious given the fact that a single output voltage actually represents wildly different air 
fuel ratios depending on the unregulated and unmeasured sensor temperature. These 
sensors were designed for operating closed loop around stoichiometry (14.64:1 for 
gasoline), and for performance tuning they are useless. 
 
The heart of the AEM gauge is the Bosch LSU4.9 Universal Exhaust Gas Oxygen 
(UEGO) sensor. This type of sensor is commonly referred to as “laboratory grade” and 
works on a different principle than the narrow band oxygen sensor found in most 
vehicles. Its unique design makes precision AFR measurements possible over the 
entire operating range. 
 
UEGO sensors use a “current pump” to determine the actual oxygen concentration 
within the sensing element. The output is in the form of a very small current, which 
varies depending on the air-fuel ratio. This is completely different from a narrow band 
oxygen sensor, which directly outputs a voltage. The UEGO sensor design allows 
measurement of the exact air fuel ratio over the entire operating range. 
 
 
 
 
 
 
  
						

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Each AEM UEGO sensor is individually calibrated and a resistor integral at the 
connector body is laser trimmed with this value. This process replaces the “free air” 
calibration procedure required by some manufacturers when changing sensors and 
implements a sensor specific calibration for unparalleled accuracy. (Figure 2) 
 
Figure 2. The connector module contains a laser trimmed calibration resistor, 
which defines the characteristic of the sensor. 
 
INSTALLATION 
Disconnect the negative (-) battery cable. There are two harnesses that connect to the 
back of the AEM UEGO gauge.  The longer harness connects to the UEGO sensor.  
The shorter harness contains four leads.  The red and black leads must be connected in 
order for the gauge to function.  Connection of the white and blue wires is optional.  
Connect the wires as shown below. (Figure 3)  The harness ends with the four and six 
pin connectors connect to the back of the gauge.  When looking at the back of the 
gauge as shown below, the six-pin connector connects on the left side and the four pin 
on the right side.  The locating tabs on the four and six pin connectors should be facing 
up. (Figure 4) 
 
 
 
Figure 3. Gauge Installation Connections 
 
 
 
 
 
  
						

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Figure 4. Gauge Side Harness Connections 
 
 
 
 
RED   
Connect to a switched 10-18 volt power source utilizing a 10A fuse. 
 
BLACK   
Connect to a clean power ground. 
 
*WHITE  
Connects to any auxiliary unit that accepts a 0-5 volt input. 
 
*BLUE  
Connects to a RS-232 com port for hyper-terminal data logging. 
 
*optional  
 
  
						

							Page 6 
 
 
Analog Output  
 
(Skip this section if you are not connecting the product to an AEM EMS.) 
If the AEM UEGO gauge is to be connected to an AEM EMS, the UEGO gauge’s 
WHITE Analog Output wire shall be connected to an EMS Lambda input. Locating a 
suitable Lambda input channel can be done using the Application Notes provided with 
the EMS. If the Application Notes are not readily accessible, a current list of AEM 
Engine Management Systems is illustrated below.  (Table 1) 
 
AEM Series 2 EMS P/N 
Lambda 
#1 Pin 
Lambda 
#2 Pin 
Sensor 
GND Pin 
30-6100/30-6101 B47B48B65
30-6010/6012/6050/6052 C16 A23 C18 
30-6000/6001/6002/6040/6042 D14 D16 D21 
30-6060 D7D14D12
30-6310/30-6311/30-6313 76 75 92 
30-6320 71 73 34 
AEM EMS-4 
Lambda 
#1 Pin  
Sensor 
GND Pin 
30-6905 20 
35
AEM Series 1 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 
 
Table 1. Lambda input channel locations for AEM EMS 
  
						

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Below (Table 2) is a list of AFR values that should be entered into the 02 Sensor #1(#2) 
Cal Table if inputting the analog signal to an AEM EMS. These calibration table(s) are 
found in the AEMPro software: Setup | Sensors | Oxygen Sensor | Oxygen Sensor 
#1(#2) 
 
02 Volts Lambda 
Gasoline AFR Methanol AFR Propane AFR Ethanol AFR CNG AFR
0.00 0.683 
10.00 4.42 10.72 6.15 9.90 
0.16 0.705 
10.32 4.56 11.07 6.34 10.22 
0.31 0.725 
10.62 4.69 11.39 6.53 10.52 
0.47 0.747 
10.94 4.83 11.73 6.73 10.84 
0.62 0.768 
11.24 4.97 12.05 6.91 11.13 
0.78 0.790 
11.56 5.11 12.40 7.11 11.45 
0.94 0.811 
11.88 5.25 12.74 7.30 11.77 
1.09 0.832 
12.18 5.38 13.06 7.49 12.06 
1.25 0.854 
12.50 5.52 13.41 7.68 12.38 
1.40 0.874 
12.80 5.66 13.73 7.87 12.68 
1.56 0.896 
13.12 5.80 14.07 8.07 12.99 
1.72 0.918 
13.44 5.94 14.41 8.26 13.31 
1.87 0.939 
13.74 6.07 14.73 8.45 13.61 
2.03 0.960 
14.06 6.21 15.08 8.64 13.93 
2.18 0.981 
14.36 6.35 15.40 8.83 14.22 
2.34 1.003 
14.68 6.49 15.74 9.02 14.54 
2.50 1.025 
15.00 6.63 16.09 9.22 14.86 
2.65 1.045 
15.30 6.76 16.41 9.41 15.15 
2.81 1.067 
15.62 6.90 16.75 9.60 15.47 
2.96 1.087 
15.92 7.04 17.07 9.79 15.77 
3.12 1.109 
16.24 7.18 17.42 9.98 16.08 
3.28 1.130 
16.54 7.31 17.74 10.17 16.38 
3.43 1.152 
16.86 7.45 18.08 10.36 16.70 
3.59 1.173 
17.18 7.59 18.42 10.56 17.02 
3.74 1.194 
17.48 7.73 18.75 10.75 17.31 
3.90 1.216 
17.80 7.87 19.09 10.94 17.63 
4.06 1.236 
18.10 8.00 19.41 11.13 17.93 
4.21 1.258 
18.42 8.14 19.75 11.32 18.24 
4.37 1.280 
18.74 8.28 20.10 11.52 18.56 
4.52 1.301 
19.04 8.41 20.42 11.70 18.86 
4.68 1.322 
19.36 8.56 20.76 11.90 19.17 
4.84 1.343 
19.66 8.69 21.08 12.09 19.47 
4.99 1.365 
19.98 8.83 21.43 12.28 19.79 
Table 2. EMS Calibration Tables, P0 mode 
 
When connecting to AEM’s Series1 EMS, make sure to verify that the O2 #1 Gain option is set 
so the voltage from the O2 #1 Volts parameter matches the voltage input at the EMS from the 
O2 sensor. An easy way to do this is to disconnect the UEGO sensor from the UEGO gauge. 
When in this state, the UEGO gauge will output 2.35 volts. You can then adjust the O2 #1 Gain 
until the O2 #1 Volts display in AEMPro reads 2.35 volts. 
When connecting to AEM’s Series2 EMS,  
						

							Page 8 
1.       Unplug the O2 Sensor from the 30-4110 Gauge. 
2.
       Open up the O2 Calibration Setup Wizard by navigating to Wizards -> Setup Wizard 
-> Sensor: O2 #1 (AFR) 
3.
       Double click the AEM Digital Gauge (PN 30-4100) it will highlight and display 
matched. 
4.
       Click Apply and close screen. 
5.
       Note: The O2 Gain options have been removed from Series2 EMS firmware.  
6.
       Next navigate to the O2 Sensor #1 Cal Table. This can be done by clicking on the 
Sensors Tab at the top of the screen or using the Display Explorer. 
a.
       Display Explorer navigation – Display -> Display Explorer -> Setup -> 
Sensors -> Oxygen Sensor(s) -> O2 Sensor #1 Cal 
b.
      Double click to open the following tables. Channels – O2 Sensors & O2 
Sensor #1 Cal 
7.
       Channels – O2 Sensor Table 
a.
       With the Gauge-Type UEGO Sensor unplugged the O2 #1 Volts parameter 
should read 2.32V (+/- .02 Volts) 
b.
      With the Gauge-Type UEGO Sensor unplugged the O2 #1 should match the 
gauge display at 14.7AFR. 
c.
       If the channel in AEMtuner is not displaying the correct 14.7 AFR value. 
Select the entire O2 Sensor #1 Cal table and increase or decrease until the 
EMS matches the gauge display. 
 
When connecting to a third party EFI system, the AEM UEGO gauge’s WHITE Analog Output 
wire shall be connected to the analog O2 sensor input of that system. Consult the 
documentation provided with the system for detailed instructions. 
 
 
Serial Output 
The serial output can be used for data logging when an EFI system is not accessible. To run the 
data stream, a RS-232 (DB-9) Female Receptacle shall be purchased. 
 
12345
6789
 
Figure 5. Wire View of RS-232 (DB-9) Male Plug 
 
Two wires need to be connected to a RS-232 serial port. The BLUE wire from the AEM UEGO 
Gauge shall be connected to Pin #2 (RX) on the serial port for receiving data. Pin # 5 (GND) on 
the serial port shall be grounded. If a standard 9-pin serial cable is to be cut instead, the (RX) 
wire is typically RED and the (GND) wire is typically GREEN. However, this should be confirmed 
with a continuity tester before attempting. (Figure 5) 
 
Use HyperTerminal for testing the data stream. This software is found on most PCs prior to 
Windows 7; other operating systems will require locating alternative terminal software such as 
TeraTerm or RealTerm. To find HyperTerminal go to: Start | All Programs | Accessories | 
Communications | HyperTerminal. Name the New Connection and click OK. Set the COM port 
to the one being used and click OK.  
 
Bits per Second = 9600 
Data Bits = 8 
Parity = None 
Stop Bits = 1 
Flow Control = Hardware 
  
						

							Page 9 
 
Verify the settings above and click OK. When power is supplied to the AEM UEGO Gauge, AFR 
(or Lambda) data will be displayed, as shown below. (Figure 6) 
 
 
Figure 6. Data logging with HyperTerminal 
 
 
 
UEGO Sensor 
The 30-4110 is compatible with Bosch LSU4.9 sensors *only*.  This sensor can be 
identified by the connector as shown in Figure 7. 
 
 
Figure 7. Use only Bosch LSU4.9 Sensors! 
 
 
 
 
 
If attempting to route the UEGO Sensor through a tight space, AEM recommends 
routing the smaller six pin connector through the hole.  If the UEGO sensor is to be put 
through a conduit or firewall, a 1.05in (26.7mm) drill is required. 
  
  
						

							Page 10 
 
IMPORTANT INSTALLATION NOTE - UEGO Sensor Mounting Orientation  
 
 
A weld-in M18 X 1.5 boss is supplied for sensor installation. Mount the O2 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 below.  (Figure 8) 
 
 
 
 
 
 
 
Figure 8. Minimum mounting angle for the UEGO Sensor