AEM 30-4900 Wideband Failsafe Gauge User Manual

WARNING:

This installation is not for the electronic novice or the PC illiterate!

Instruction Manual

P/N 30-4900 Wideband Failsafe Gauge

Use this system with EXTREME caution! If you are not well versed
in electronics and vehicle instrumentation or are not PC literate,
please do not attempt the installation. Refer the installation to an
AEM trained tuning shop. A list of AEM trained tuning shops is
available at www.aemelectronics.com/dealer_locator.php or by

!

Wideband Failsafe Gauge Parts List

calling 800-423-0046. You should also visit the AEM Performance
Electronics Forum at http://www.aemelectronics.com.

NOTE: AEM holds no responsibility for any engine damage that
results from the misuse of this product!

Qty Description Qty Description

1 Wideband Failsafe Gauge 1 Faceplate, Lambda Black
1 UEGO Sensor 1 Faceplate, Vacuum Black
1 UEGO Harness 1 Harness, Input / Output
1 Install Kit w/ Bung 1 Rubber Band
1 Power Harness 1 Wideband Failsafe Instructions
1 USB Cable 1 Gauge Box
1 Faceplate, AFR White 1 Boost Hose Adapter
1 Faceplate, Boost Black 1 Vacuum Hose, 7/64” ID x 36” L
1 Faceplate, Boost White 1 Silver Bezel

This product is legal in California for racing vehicles only and should never be used on public highways.

AEM Performance Electronics

2205 126th Street Unit A, Hawthorne, CA. 90250

Phone: [phone] Fax: [phone]

http://www.aemelectronics.com

Instruction Part Number: 10-4900 Rev B

 2012 AEM Performance Electronics

GETTING STARTED

THIS PRODUCT DOES NOT INCLUDE SOFTWARE IN THE PACKAGING. PLEASE DOWNLOAD
AND INSTALL THE WIDEBAND FAILSAFE CONFIGURATION SOFTWARE FROM THE AEM
WEBSITE AT: www.aemelectronics.com/downloads

Alternatively, register on the AEM Electronics Forums at http://forum.aempower.com/forum/index.php
Click on the All Software & Firmware Downloads forum. Click on the AEM Wideband Failsafe Software
link to reach the download page. The most recent software revision will be posted here as well as the link
above. Note that you can subscribe to this thread to be notified when software updates are released. All
current software releases will include a set of revision notes describing feature changes or additions since
the last update.

Software Installation Instructions

Follow the Installation Instructions as outlined in the forum post described above. After the software
installation is complete, click on the AEM Wideband Failsafe icon (shown below) to launch the
application.

Connect the USB cable to the PC. The Wideband Failsafe will turn ON with ignition key-on power.
Alternatively, the Wideband Failsafe can be bench-programmed outside of the vehicle without powering it
by connecting just the USB cable. However, the UEGO sensor, MAP sensor, analog outputs, and CAN
outputs will not function.

Firmware Updates

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 Failsafe Software. Go to the Tools drop down menu and select Update Firmware and
follow the on-screen instructions.

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Overview

AEM Wideband Failsafe is an advanced safety device that allows the end user to closely monitor the
performance of their engine. As a tuning tool, this device provides the ability to accurately monitor AFR,
while actively protecting the engine by constantly recording AFR curves and activating a user-defined
failsafe strategy if it runs dangerously lean or excessively rich.

The Wideband FAILSAFE Gauge is a UEGO (Universal Exhaust Gas Oxygen) controller with an internal
boost sensor, an internal data logger and a full color Organic Light Emitting Diode (OLED) display. It
includes technology to activate a failsafe strategy in the event AFR falls outside of a user-defined
operating window. If the AFR falls outside of the set operating window, the Wideband FAILSAFE Gauge
triggers a user defined output function that can save an engine from catastrophic damage.

Installation Diagram

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Installation

1. Disconnect the negative battery cable.

2. Temporarily install gauge without bracket into desired mounting location. Gauge mounts into a 2-1/16”
(52MM) hole. The supplied rubber band can be used as a spacer around the gauge if it fits loosely in
mounting hole.

3. Locate a suitable place in the exhaust system to install the included oxygen sensor weld bung. On non­turbocharged engines, mount the oxygen sensor in the exhaust system at least 18 inches downstream
from the exhaust port. On turbocharged engines the oxygen sensor must be installed after the
turbocharger, ideally 18” downstream from the turbocharger exhaust housing. NOTE: If the sensor is
mounted before the turbocharger the pressure differential will affect the accuracy of the unit. For
accurate readings, the sensor must be mounted upstream of the 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 image below.

4. Next, the UEGO sensor 8-pin wiring harness should be routed to the oxygen sensor bung.

Pin Color

1 N/C N/C
2 White Heat ­3 Orange VM
4 Green IA
5 Red IP
6 Black UN
7 N/C N/C
8 Brown 12V

Description

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5. Next the main 16-pin connector will be manually wired into the vehicle.

Pin

1 Black Ground; connect to good chassis ground or directly to battery negative (−) terminal
2 Red Ignition power; connect to a fused key on +12V power source
3 Black USB - Dedicated
4 N/C Reserved
5 Red USB - Dedicated
6 Green USB - Dedicated
7 Blue *OPTIONAL* Ground output; connect to an external auxiliary device (1.5A max current)
8 White USB - Dedicated

9 Green *OPTIONAL* Engine Speed Input; connect to a square wave trigger
10 Gray *OPTIONAL* Gauge backlighting; connect to instrument lighting dimmer wire
11 N/C Reserved
12 N/C** *OPTIONAL* AEMnet ­13 N/C** *OPTIONAL* AEMnet +

Color Description

14 Brown *OPTIONAL* Analog ground for AFR and MAP; connect to sensor ground of data logger or EMS
15 White *OPTIONAL* 0-5V analog output for AFR; connect to + analog input of data logger or EMS
16 Yellow *OPTIONAL* 0-5V analog output for MAP; connect + analog input of data logger or EMS

NOTES:

• Pins 14/15 are differential analog outputs. The brown wire should be connected to an analog
ground input for best results. If the EMS, logger or similar device does not have an analog ground
input, the brown wire should be connected to a sensor ground. If no sensor ground is available, the
brown wire should be connected to a power ground. The brown wire must be connected in order to
obtain correct AFR and MAP readings from the analog output(s).

• ** Pins 12/13 are un-populated as delivered. Please order the optional 30-3439 wiring harness to
connect the WBFS gauge to other AEMnet products.

• The WBFS gauge is able to receive RPM CAN data input from an AEM ECUs such as the Series-2.

6. Connect all cables and wiring harnesses to gauge. Fully install gauge into hole using mounting bracket
and nuts.

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7. Install USB cable so the PC end of the cable is easily accessible and route the gauge end of cable to

Description

Button

Description

the gauge mounting location. USB cable is meant to be permanently installed to gauge and left in
vehicle. Stow PC end of cable in location such as glove box or center console, etc.

Wideband Failsafe Configuration

In this tab, the AFR monitoring and alarm output functionality of the Wideband Failsafe can be configured.

Air to Fuel Ratio vs. Pressure

Displays AFR vs. Pressure data points. AFR points will be populated live whenever the PC is connected to the
Wideband Failsafe and the UEGO sensor is registering an input. The current AFR and Pressure values are shown
live on the right side of the graph. The graph area is where the high and low AFR limit lines are established.
Configure the pressure scale and AFR scale before setting the boundary lines as they will reset each time a different
scale is selected.

Graph

Auto Set Limits

Reset Limits Resets the upper AFR limit line to maximum and the lower AFR limit line to minimum
Clear Graph

Automatically sets the upper and lower AFR lines based on an average of the collected AFR
data points

Clears all the displayed AFR data points from the graph; does not clear stored AFR data from
logger

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Logger

Button

Description

Parameter

Description

Option

Description

Option

Description

Parameter

Description

Option

Description

Log Percentage Displays current amount of data recorded

Download Log

Clear Log Clears all stored AFR data from the logger

Downloads all the collected AFR data that is stored in the logger; will prompt to save log to disk;
log files saved as .daq for direct viewing in AEMdata program

RPM

RPM Displays the current engine speed dictated by the Pulses Per Revolution option.

Pulses Per
Revolution

Using the RPM parameter, select the number of pulses per revolution to properly calibrate the
engine speed input.

Alarm Configuration

Alarm Delay
Alarm Reset

Disable Auto Reset Select to require power cycle to reset alarm; overrides the automatic alarm reset period.

GND Output

Period of time that measured AFR can be outside the upper and lower AFR limit lines before an
alarm condition is triggered; 100-1000 milliseconds
Period of time AFR must be within the acceptable range before the alarm will automatically
reset and turn OFF; 1-10 seconds

Select to turn the ground output ON or turn the ground output OFF when an alarm is triggered;

1.5 amps max

Alarm Status

Status Indicator Color indicates status; green is system ready, red is alarm triggered

Source

Alarm Press Pressure when alarm was triggered; Units determined by Pressure Scale selection

Alarm AFR AFR when alarm was triggered; Units determined by AFR Scale selection

Alarm Test Simulates the alarm to test output configuration; test duration set by Alarm Delay value

Indicates the source of the alarm condition; possible alarm conditions are high AFR, low AFR,
auxiliary input, and alarm test

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