AEM Digital Wideband UEGO Gauge 304110 User Manual

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Configuring Calibration Outputs 
The AEM default position is (P0).  When set to (P0) (Figure 10A), the gauge displays 
AFR values. (P1) is the same as (P0), except the gauge displays lambda values.  These 
settings (P1 and P0) implement a linear calibration with the most useful voltage range 
possible (0-5V). The AFR calibration (P2) is linear and similar to (P1) with a smaller 
voltage range (1-2V). The AFR calibration (P3) emulates the Autronic Wideband O2 
Sensor calibration (0-1V). The AFR calibration (P4) emulates a non-linear Nernst Cell 
calibration (0-1V). Refer to the Table 3 and Figure 9 for specific calibration details. 
 
LED LED Lambda  AFR (Gasoline)  Analog Output Voltage Modes 
Number Color (λ) AFR LED ON Range P0 P1 P2 P3 P4 
LED 1 Green 0.683  10  Rich  Rich  0.000 0.000 1.000 0.000 0.905 
LED 1  Green  0.700  10.25  Rich  Rich  0.125 0.125 1.025 0.013 0.904 
LED 1  Green  0.717  10.5  Rich  Rich  0.250 0.250 1.050 0.025 0.903 
LED 1  Green  0.734  10.75  Rich  Rich  0.375 0.375 1.075 0.038 0.902 
LED 1  Green  0.751  11.00  Rich  11.125 0.500 0.500 1.100 0.050 0.901 
LED 2  Green  0.768  11.25  11.125  11.375 0.625 0.625 1.125 0.063 0.900 
LED 3  Green  0.786  11.50  11.375  11.625 0.750 0.750 1.150 0.075 0.890 
LED 4  Green  0.803  11.75  11.625  11.875 0.875 0.875 1.175 0.088 0.880 
LED 5  Green  0.820  12.00  11.875  12.125 1.000 1.000 1.200 0.100 0.870 
LED 6  Green  0.837  12.25  12.125  12.375 1.125 1.125 1.225 0.113 0.860 
LED 7  Green  0.854  12.50  12.375  12.625 1.250 1.250 1.250 0.125 0.850 
LED 8  Green  0.871  12.75  12.625  12.875 1.375 1.375 1.275 0.138 0.840 
LED 9  Green  0.888  13.00  12.875  13.125 1.500 1.500 1.300 0.150 0.830 
LED 10  Green  0.905  13.25  13.125  13.375 1.625 1.625 1.325 0.163 0.820 
LED 11  Green  0.922  13.50  13.375  13.625 1.750 1.750 1.350 0.175 0.800 
LED 12  Yellow  0.939  13.75  13.625  13.875 1.875 1.875 1.375 0.188 0.775 
LED 13  Yellow  0.956  14.00  13.875  14.125 2.000 2.000 1.400 0.200 0.750 
LED 14  Yellow  0.973  14.25  14.125  14.375 2.125 2.125 1.425 0.213 0.700 
LED 15  Yellow  0.990  14.50  14.375  14.625 2.250 2.250 1.450 0.225 0.600 
LED 16  Yellow  1.008  14.75  14.625  14.875 2.375 2.375 1.475 0.238 0.410 
LED 17  Yellow  1.025  15.00  14.875  15.125 2.500 2.500 1.500 0.250 0.240 
LED 18  Yellow  1.042  15.25  15.125  15.375 2.625 2.625 1.525 0.263 0.170 
LED 19  Yellow  1.059  15.50  15.375  15.625 2.750 2.750 1.550 0.275 0.137 
LED 20  Yellow  1.076  15.75  15.625  15.875 2.875 2.875 1.575 0.288 0.113 
LED 21  Red  1.093  16.00  15.875  16.125 3.000 3.000 1.600 0.300 0.100 
LED 22  Red  1.110  16.25  16.125  16.375 3.125 3.125 1.625 0.313 0.091 
LED 23  Red  1.127  16.50  16.375  16.625 3.250 3.250 1.650 0.325 0.083 
LED 24  Red  1.144  16.75  16.625  Lean  3.375 3.375 1.675 0.338 0.077 
LED 24  Red  1.161  17.00  Lean  Lean 3.500 3.500 1.700 0.350 0.076 
LED 24  Red  1.178  17.25  Lean  Lean 3.625 3.625 1.725 0.363 0.075 
LED 24  Red  1.195  17.50  Lean  Lean 3.750 3.750 1.750 0.375 0.074 
LED 24  Red  1.212  17.75  Lean  Lean 3.875 3.875 1.775 0.388 0.073 
LED 24  Red  1.230  18.00  Lean  Lean 4.000 4.000 1.800 0.400 0.072 
LED 24  Red  1.247  18.25  Lean  Lean 4.125 4.125 1.825 0.413 0.071 
LED 24  Red  1.264  18.50  Lean  Lean 4.250 4.250 1.850 0.425 0.070 
 
 Table 3. Calibration table of available outputs 
  
						

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10.0 11.0
12.0
13.0
14.0 15.0 16.0
17.0
18.0
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
Analog Voltage (V)
Air/Fuel Gasoline (AFR)
0.68 0.78 0.88
0.98 1.08 1.18
Lambda (λ) 
AFR Small Volt Range (P2)AFR Autronic Emula tion (P3)
AFR Ne rnst Emula tion (P4)AEM GAUGE De fa ul t (P 0 & P1) Figure 9. Calibration graph of available outputs 
 
To change the calibrations, a precision flat head screwdriver is needed. Locate the small hole located on 
the back of the AEM gauge, as shown below. (Figure 10) 
 
 
 
 
 
 
 
 
 
 
 
 
 
Figure 10. Calibration position screw location 
 
With the screwdriver, clock the rotary switch into the desired calibration position, referring to the diagram 
below (Figure 10A), and watch the alphanumeric readout, which will display the new position when 
entered. 
P4
P3
P2
P1P0
ROTARY SWITCH
 
Figure 10A. Calibration screw position settings 
 
The calibration will not be changed until the rotary switch reaches the middle of the new position.  
						

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Changing the gauge configuration 
The AEM UEGO gauge comes configured with the black bezel and the black AFR 
faceplate.  However, a silver bezel, a white AFR faceplate, and a black Lambda 
faceplate are also included in the gauge kit.  To change the faceplate or bezel, orient 
the gauge so you are looking at the faceplate.  Rotate the bezel counter-clockwise to 
unscrew it from the gauge cup.  The bezel, glass lens, rubber spacer, faceplate, and 
anti-glare shield are all removable.  Reassemble the gauge as shown in the photo 
below.  Make sure the small light holes in the faceplate and anti-glare shield line up with 
the light sensor on the circuit board.  Do not over tighten the bezel when reassembling 
the gauge. (Figure 11) 
 
 
 
 
 
 
 
 
Figure 11. Gauge Assembly 
 
For your reference, below is the multiplier for calculating the Air Fuel Ratio (AFR) of common 
fuels from the Lambda value. 
 
Gasoline AFR    =   Lambda x 14.64 
Methanol AFR   =   Lambda x 6.47 
Propane AFR    =   Lambda x 15.7 
Ethanol AFR     =   Lambda x 9.00 
CNG AFR     =   Lambda x 14.5 
 
Specifications: 
Gauge 
Supply Current (nominal):  1.3 amps 
0-5V Analog Outputs:  1 
Measuring Range: Sweeping LED   0.751 to 1.143 Lambda 
Measuring Range: Numerical Display  10.0:1 to 18.5:1 AFR Gasoline 
Harness & Connector Temp Limit:  105C 
Sensor 
Type:  Bosch UEGO LSU4.9 
Accuracy: +/- 0.7% 
Exhaust Temp Limit:  1030C 
Cable & Protector Sleeve Temp Limit:  250C 
Connector Temp Limit:  120C 
Initial Warm-up Time:  Less than 20 seconds 
Weight: 80 grams 
Heater Current:  1.2A at 12.0V (each sensor) 
Mounting:  M18 X 1.5 thread, Torque to 30 ft-lbs 
Nominal Service Life: 
 
 
 80,000 km for Unleaded Fuel 
50,000 km for Leaded Fuel 0.15g Pb/l 
20,000 km for Leaded Fuel 0.40g Pb/l 
10,000 km for Leaded Fuel 0.60g Pb/l 
  
						

							Page 14 
 
 
IMPORTANT Notes – PLEASE READ 
The sensor contains a ceramic module and should not be subject to mechanical or 
thermal shock or it may be damaged. The sensor is not designed for operation on 
leaded fuels, doing so will dramatically shorten sensor life. Long term running in the rich 
region (Lambda < 0.95) will shorten sensor life. High exhaust temperatures (over 850C) 
will shorten sensor life. Engine oil consumption at a rate greater than 1 quart per 1,000 
miles will shorten sensor life. With the UEGO Sensor installed, do not run the engine 
without power applied to the gauge. 
 
12 MONTH LIMITED WARRANTY 
 
Advanced Engine Management Inc. warrants to the consumer that all AEM High Performance products will be free from defects in 
material and workmanship for a period of twelve (12) months from date of the original purchase. Products that fail within this 12-
month warranty period will be repaired or replaced at AEM’s option, when determined by AEM that the product failed due to defects 
in material or workmanship. This warranty is limited to the repair or replacement of the AEM part. In no event shall this warranty 
exceed the original purchase price of the AEM part nor shall AEM be responsible for special, incidental or consequential damages 
or cost incurred due to the failure of this product. The Bosch LSU 4.9 UEGO sensor has a limited life and is not warranted.   
Warranty claims to AEM must be transportation prepaid and accompanied with dated proof of purchase. This warranty applies only 
to the original purchaser of product and is non-transferable. All implied warranties shall be limited in duration to the said 12 month 
warranty period. Improper use or installation, accident, abuse, unauthorized repairs or alterations voids this warranty. AEM disclaims 
any liability for consequential damages due to breach of any written or implied warranty on all products manufactured by AEM. 
Warranty returns will only be accepted by AEM when accompanied by a valid Return Goods Authorization (RGA) number.  Product 
must be received by AEM within 30 days of the date the RGA is issued. 
 
 
Please note that before AEM can issue an RGA for any product, it is first necessary for the installer or end user to contact the AEM 
Performance Electronics tech line at 1-800-423-0046 to discuss the problem.  Most issues can be resolved over the phone.  Under 
no circumstances should a system be returned or a RGA requested before the above process transpires. 
 
 
Need additional help?  Contact the AEM Performance Electronics tech department at  
1-800-423-0046 or [email protected], or visit the AEM Performance Electronics 
forum at http://forum.aempower.com/forum/