AEM Flex Fuel Wideband Failsafe Gauge Includes FF Sensor 304911 User Manual

							Page 12 
Data Logger 
 
The Wideband Ethanol Boost has an internal logger that can store approximately 2.5 hours of data.  The system 
maintains two levels of data logs.  First, all AFR data points are stored and downloadable for viewing on the AFR vs. 
Pressure Graph in the W ideband Ethanol Boost Configuration tab.  Second, all inputs, outputs, and alarm triggers are 
logged in special log file format for viewing with the AEMdata software that comes as part of the W ideband Failsafe 
download package.  Once the logger memory has filled up, the logger will begin to loop log and the oldest data will be 
discarded as new data is collected (data points that were collected will slowly start disappearing). The following is a basic 
guideline on how to use the internal data logger.  NOTE: The internal data logger is always running when 12V is present. 
 
1. Connect USB cable to PC.   
2. In the W ideband Ethanol Boost Configuration tab under Logger, click Download Log.  All logged AFR data 
points will now be displayed in the AFR vs. Pressure Graph. 
3. To download the log to the PC, click YES when prompted to save data to disc and then save log in desired 
location. 
4. Click YES when prompted to open file in AEMdata, the saved data log will now open as shown below. 
 
 
Plot One 
Parameter Description 
AFR Current measured AFR (Gasoline) 
AFR Upper Limit Current upper AFR limit value as set from the Wideband Ethanol Boost Configuration tab 
AFR Lower Limit Current lower AFR limit value as set from the Wideband Ethanol Boost Configuration tab 
  
Plot Two 
Parameter Description 
Manifold Pressure Current measured Manifold Pressure in PSIg 
Engine Speed Current measured RPM, if connected and used 
Plot Three 
Parameter Description 
Alarm Source Indicates what triggered the alarm condition; 3-low AFR condition, 5-high AFR condition, 3-auxiliary input, 9-
alarm test 
Alarm Status Indicates state of alarm; 1-alarm triggered, 0-alarm not triggered 
Alarm Reset Limit Alarm Reset value 
Alarm Reset Counter Counts up from zero to Alarm Reset value once AFR has returned into the acceptable range 
Alarm Delay Limit Alarm Delay value 
Alarm Delay  Counter 
Counts up from zero to Alarm Delay value when AFR occurs outside the high or low AFR limits; once full 
Alarm Delay value is reached the alarm will trigger; counter will reset back to zero if AFR returns back into 
the acceptable range once count up has began  
						

							Page 13 
Output Configuration 
 
The Wideband Ethanol Boost has one ground (low side) output that is triggered when an alarm condition exists.  This 
output can be used in a multitude of ways to reduce boost, retard ignition timing, or otherwise protect an engine in the 
event there is a problem with the fuel system.  The following is an index of possible auxiliary devices that can be triggered 
by the alarm output: 
 
AEM EMS 
Function Description 
Nitrous Fuel & Ignition 
Maps 
Use the ground output to trigger the nitrous fuel and ignition maps; ignition timing can be reduced and fuel 
can be added 
Boost Switch Use the ground output to trigger the boost switch; a lower boost value can be targeted 
Two-Step Use the ground output to trigger the two-step; a lower engine rev limit can be selected 
 
MSD Ignition Products 
Product Description 
DIS2 (62112) 
Brown wire: use a relay to apply +12V to trigger ignition interrupt 
Blue wire: use a relay to apply +12V to trigger two step 
Pink wire: use a relay to apply +12V to trigger timing retard 
DIS4 (62152) 
Brown wire: use a relay to apply +12V to trigger ignition interrupt 
Blue wire: use a relay to apply +12V to trigger two step 
Pink wire: use a relay to apply +12V to trigger timing retard 
6AL-2 (6421) Blue wire: use a relay to apply +12V to trigger two step 
Programmable  
6AL-2 (6530) 
Dark blue wire: use a relay to apply +12V to trigger launch rev limit 
Light blue wire: use a relay to apply +12V to trigger burn out rev limit 
Pink wire: use a relay to apply +12V to trigger timing retard 
Digital 6 Plus (6520) Blue wire: use a relay to apply +12V to trigger two step 
Pink wire: use a relay to apply +12V to trigger timing retard 
Start/Retard Control (8982) Violet wire: use a relay to apply +12V to trigger timing retard 
Timing Controller (8980) Grey wire: ground input to trigger timing retard 
 
Warning Light 
 
The Wideband Ethanol Boost can also be used to directly 
activate a warning light (Autometer PN 3239 or similar). 
Connect the warning light’s white wire to 12V and the low 
side output to the warning light’s black (ground) wire to turn 
the light ON. NOTE: High current lights will require a relay 
to be installed. 
  
 
 
 
 
 
 
 
 
 
 
 
  
						

							Page 14 
NC/NO Relay  
 
The following are examples of how a NC/NO relay (Bosch PN 0-332-019-203 or similar) can be configured for use with 
the Wideband Failsafe. 
 
Signal Interrupt: The low side (ground) output from the 
Wideband Ethanol Boost can be used to turn ON a NC 
(normally closed) relay and interrupt the output signal 
from a boost controller to its boost solenoid (shown 
below). NOTE: Be sure that pulling power from the boost 
solenoid will decrease boost down to the wastegate 
spring pressure rather than increase boost to the 
turbochargers max. This will depend on what type of 
wastegate is used and how it is plumbed with vacuum 
hose. 
 
Auxiliary Device: The low side (ground) output from the 
Wideband Ethanol Boost can be used to turn ON a NO 
(normally open) relay and activate or deactivate an auxiliary 
device that can be used to reduce timing or boost or control 
some other function when the current requirement is greater 
than 1.5 amps. 
 
 
 
 
Appendix I - Analog Outputs 
 
There are 2 analog outputs from the Wideband Ethanol Boost; Ethanol Content (Flex Fuel %) and AFR (O2). These 
outputs are both linear DC voltage signals that vary with Ethanol Content or AFR.  These signals are used for sending 
information to a data logger or an engine management system such as an AEM EMS, AEM F/IC, AEM Infinity, etc.  
 
% = (Volts *25) – 12.5 
Voltage Ethanol % 
0.5 0 
1.0 12.5 
1.5 25.0 
2.0 37.5 
2.5 50.0 
3.0 62.5 
3.5 75.0 
4.0 87.5 
4.5 100 
5.0 SENSOR ERROR   
AFR Output Transfer Function  AFR (Gas) = (2.375 * Volts) + 7.3125 
Voltage AFR (Gas) AFR (Lambda) 
0.5 8.50 0.58 
1.0 9.69 0.66 
1.5 10.88 0.74 
2.0 12.06 0.82 
2.5 13.25 0.91 
3.0 14.44 0.99 
3.5 15.63 1.07 
4.0 16.81 1.15 
4.5 18.00 1.23 
 
 
 
 
 
  
						

							Page 15 
Appendix II - Changing Faceplate / Bezel 
 
The Wideband Ethanol Boost gauge comes with the black bezel and Air/Fuel-Gasoline faceplate installed. However, a 
silver bezel and multiple faceplates are also included.  To change them, orient the gauge so you are looking at the 
faceplate.  Rotate the bezel counter-clockwise to unscrew it from the gauge cup.  The bezel, lens, and rubber spacer are 
all removable.  Next, remove the faceplate, but note the two keyways on each side. W hen inserting the new faceplate be 
cognizant of these keyways and line them up before reassembling.  
 
When reassembling the gauge, it may be necessary to apply a light amount of pressure on the lens and spacer to keep 
the faceplate from rotating when reinstalling the bezel. Do not over-tighten the bezel when reassembling the gauge. 
 
 
Appendix III - AEMnet 
 
The following instructions describe the proper installation of the optional AEMnet Harness (30-3439), which is 
used to connect the W ideband Ethanol Boost AEMnet communication lines to a second (or multiple) AEMnet 
device(s). 
 
Disconnect the W ideband Ethanol Boost 16-pin 
harness connector from the Wideband Failsafe 
gauge. The harness connector has a latch on 
the bottom side that needs to be squeezed as 
the connector is lightly freed from the gauge. 
 
  
Locate the green and white pre-crimped 
terminals on the end of the AEMnet Harness. 
This table shows the Wideband Ethanol Boost 
connector and pinout including the green and 
white leads from the AEMnet harness. 
 
 
  
						

							Page 16 
Before inserting the terminals into the 
connector, refer to the figure to be sure that the 
locking mechanism on the terminals is 
positioned properly in the connector. 
 
 
  
Insert the AEMnet+ terminal (white wire) into 
the available Pin 13 on the Wideband Ethanol 
Boost connector. Push the wire in until the 
locking mechanism on the terminal and 
connector lock into place. Pull lightly on the 
white wire to confirm the locking mechanism 
has latched. This figure shows the correct 
placement of the AEMnet+ terminal. 
 
  
Insert the AEMnet- terminal (green wire) into 
the available Pin 12 on the Wideband Ethanol 
Boost connector. Push the wire in until the 
locking mechanism on the terminal and 
connector lock into place. Pull lightly on the 
green wire to confirm the locking mechanism 
has latched. This figure shows the correct 
placement of the AEMnet- terminal. 
 
 
  
Connect the Deutsch connector on the opposite end of the AEMnet harness to a mating Deutsch connector on a 
second device with AEMnet capabilities. The AEMnet harness includes a male and female Deutsch connector, 
allowing AEMnet devices to be daisy-chained together. 
 
Appendix IV – Firmware Updates 
 
Do not attempt to update firmware unless instructed by AEM Technical Support.  To update the firmware, download 
the firmware file, if available, from www.aemelectronics.com/downloads. While connected to the gauge with the USB 
cable, open the AEM Wideband Ethanol Boost Software. Go to the Tools drop down menu and select Update 
Firmware and follow the on-screen instructions. 
 
 
 
 
 
 
 
 
 
 
  
						

							Page 17 
 
Appendix V – AEMnet Messages 
 
Message 
ID: 0x00000026 (29-bit) 
 Rate: 10mS continuous 
Byte Label Data Type Scaling Offset Range 
0 Lambda 16 bit unsigned .0001 Lambda/bit 0 0 to 6.5535 Lambda 1 
2 Pressure 16 bit unsigned .001 PSI/bit -15 -15 to 50.535 PSI 3 
4 Fuel Temperature 8 bit signed 1 degC/bit  0  -40 degC – 125degC  5 Flex Fuel Ethanol Content 8 bit unsigned 1 %/bit 0 0 – 100% 
6 (bit0) AFR Ready Boolean 0 = false, 1 = true 0 0/1 
6 (bit1) AFR Heater Open Error Boolean 0 = false, 1 = true 0 0/1 
6 (bit2) AFR CJ125 Error Boolean 0 = false, 1 = true 0 0/1 
6 (bit3) AFR Sensor Heating Up Boolean 0 = false, 1 = true 0 0/1 
6 (bit4) AFR Low Voltage Boolean 0 = false, 1 = true 0 0/1 
6 (bit5) AFR Heater Time-Out Error Boolean 0 = false, 1 = true 0 0/1 
6 (bit6) AFR Heater Short Error Boolean 0 = false, 1 = true 0 0/1 
6 (bit7) AFR Overtemp Error Boolean 0 = false, 1 = true 0 0/1 
7 (bit0) Alarm Status Boolean 0 = false, 1 = true 0 0/1 
7 (bit1) Alarm Source Boolean 0 = false, 1 = true 0 0/1 
7 (bit2) Alarm Source Boolean 0 = false, 1 = true 0 0/1 
7 (bit3) Alarm Source Boolean 0 = false, 1 = true 0 0/1 
7 (bit4) --- --- --- --- --- 
7 (bit5) --- --- --- --- --- 
7 (bit6) --- --- --- --- --- 
7 (bit7) --- --- --- --- --- 
      Message 
ID: 0x00000027 (29-bit) 
 Rate: 10mS continuous 
Byte Label Data Type Scaling Offset Range 
0 Lambda Upper Limit 16 bit unsigned .0001 Lambda/bit 0 0 to 6.5535 Lambda 1 
2 Lambda Lower Limit 16 bit unsigned .0001 Lambda/bit 0 0 to 6.5535 Lambda 3 
4 Alarm Delay Limit 16 bit unsigned 1 mS/bit 0 0 to 65,535 mS 5 
6 Alarm Delay Counter 16 bit unsigned 1 mS/bit 0 0 to 65,535 mS 7 
      Message 
ID: 0x00000028 (29-bit)  Rate: 10mS while in alarm mode, not transmitted otherwise 
Byte Label Data Type Scaling Offset Range 
0 Alarm Lambda 16 bit unsigned .0001 Lambda/bit 0 0 to 6.5535 Lambda 1 
2 Alarm Pressure 16 bit unsigned .001 PSI/bit -15 -15 to 50.535 PSI 3 
4 Alarm Reset Limit 16 bit unsigned 1 mS/bit 0 0 to 65,535 mS 5 
6 Alarm Reset Counter 16 bit unsigned 1 mS/bit 0 0 to 65,535 mS 7 
 
 
 
 
 
 
 
 
  
						

							Page 18 
 
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.  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 Merchandise Authorization 
(RMA) number.  Product must be received by AEM within 30 days of the date the RMA is issued. 
 
  
UEGO oxygen sensors are considered wear items and are not covered under warranty. 
 
Please note that before AEM can issue an RMA for any electronic product, it is first necessary for the installer or end user to contact the 
EMS  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 RMA requested before the above process transpires. 
 
AEM  will  not  be  responsible  for  electronic  products  that  are  installed  incorrectly,  installed  in  a  non-approved  application,  misused,  or 
tampered with.  
 
Any  AEM  electronics  product  can  be  returned  for  repair  if  it  is  out  of  the  warranty  period.  There  is  a  minimum  charge  of  $50.00  for 
inspection and diagnosis of AEM electronic parts. Parts used in the repair of AEM electronic components will be extra. AEM will provide 
an estimate of repairs and receive written or electronic authorization before repairs are made to the product. 
 
 
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: 
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