AEM Wideband Failsafe Gauge 304900 User Manual
Here you can view all the pages of manual AEM Wideband Failsafe Gauge 304900 User Manual. The AEM manuals for Wideband UEGO Air/Fuel Controllers are available online for free. You can easily download all the documents as PDF.
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Page 12 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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Page 13 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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Page 14 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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Page 15 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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Page 16 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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Page 17 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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Page 18 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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Page 19 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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Page 20 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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Page 21 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)...