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AEM Wideband Failsafe Gauge 304900 User Manual

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4.  With a baseline AFR curve now established, click on Auto Set Limits and the software will 
produce its best suggested high and low AFR limit l ines based on the populated AFR data shown 
on the graph. Review and adjust the high and low AF R limit lines as needed to contour the lines 
around the baseline AFR curve (shown below). This c an be done by clicking on a breakpoint and 
either dragging up or down with the mouse or by cli cking the up and down arrows on the 
keyboard.  To move to the...

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Data Logger 
  
The Wideband Failsafe has an internal logger that c an store approximately 2.5 hours of data.  The 
system maintains two levels of data logs.  First, a ll AFR data points are stored and downloadable for 
viewing on the AFR vs. Pressure Graph in the W ideba nd Failsafe Configuration tab.  Second, all inputs, 
outputs, and alarm triggers are logged in special l og file format for viewing with the AEMdata softwar e 
that comes as part of the Wideband Failsafe downloa d package....

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Plot One 
Parameter Description 
AFR  Current measured AFR (Gasoline) 
AFR Upper Limit  Current upper AFR limit value as set from the Wideband Failsafe Configuration tab 
AFR Lower Limit  Current lower AFR limit value as set from the Wideband Failsafe Configuration tab 
   
Plot Two 
Parameter Description 
Manifold Pressure  Current measured Manifold Pressur e in PSIg 
Engine Speed  Current measured RPM, if connected and  used 
   
AEM EMS Series 1 / Series 2 Parameters 
 
Below is the W ideband...

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Output Configuration 
  
The Wideband Failsafe 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 r educe 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 alar m output: 
 
AEM EMS 
Function Description 
Nitrous Fuel & 
Ignition Maps  Use the ground output...

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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 W ideband Fa ilsafe can be used to turn ON a NC 
(normally closed) relay and interrupt the output si gnal from a boost controller to its boost solenoid (shown 
below). NOTE: Be sure that pulling power from the b oost solenoid will decrease boost down to the 
wastegate spring...

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Appendix I - Analog Outputs 
  
There are 2 analog outputs from the Wideband Failsafe; Pressure (MAP) and AFR (O2). These outputs 
are both linear DC voltage signals that vary with P ressure or AFR.  These signals are used for sending  
information to a data logger or an engine managemen t system such as an AEM EMS, AEM F/IC, AEM 
Infinity, etc.  
Pressure Output Transfer Function 
Pressure (psig) = (10 * Volts) – 16 
 
Voltage Pressure (psig) Pressure (Bar) Pressure (kPA) 
0.5  -11  0.25  25...

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Appendix II - Changing Faceplate / Bezel 
  
The Wideband Failsafe 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 s o 
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 removabl e.  Next, remove the faceplate, but note the two 
keyways on each side. W hen inserting...

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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 Failsa fe AEMnet communication lines to a second 
(or multiple) AEMnet device(s).    1.  Disconnect the W ideband Failsafe 16-pin harness  connector from the Wideband Failsafe gauge. The 
harness connector has a latch on the bottom side th at needs to be squeezed as the connector is 
lightly freed from the gauge. Refer to Figure 1...

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4.  Insert the AEMnet+ terminal (white wire) into the available Pin 13 on the W ideband Failsafe 
connector. Push the wire in until the locking mecha nism on the terminal and connector lock into 
place. Pull lightly on the white wire to confirm th e locking mechanism has latched. Figure 4 below 
shows the correct placement of the AEMnet+ terminal . 
 
 
Figure 4 
 
5.  Insert the AEMnet- terminal (green wire) into th e available Pin 12 on the W ideband Failsafe 
connector. Push the wire in until...

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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 RPM 16 bit unsigned .39063 RPM/bit 0 0 to 25,600 RPM 5 
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)...
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