AEM Digital Wideband UEGO Gauge without Sensor 304110NS 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: 10-4110NS Rev 151130  2015 Advanced Engine Management, Inc.   Page 1 
 
 
 
Installation Instructions for 
30-4110NS “No Sensor” 
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 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) 
 
 
IMPORTANT NOTE: 
The 30-4110NS kit is NOT supplied with a wideband sensor.  The following sensors are 
approved for use with this, and only this, product: 
Manufacturer Part Number Description 
AEM 30-2004 Bosch LSU4.9 (950mm) 
Bosch 17025 Bosch LSU4.9 (950mm) 
Walker 250-25036 Bosch LSU4.9 (950mm) 
Walker 250-25075 Bosch LSU4.9 (325mm) 
 
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  
 
    
						

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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 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 
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,  
						

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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. 
 
 
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 
 12345
6789  
						

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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. 
  
  
						

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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