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7/12/2017 - DOCUMENT NUMBER: 10-0300
© 2017 AEM Performance Electronics
30-0300 X-Series UEGO Gauge
Operation
Mode (MODE) and select (SEL) buttons are located on the face of the gauge for configuration; refer to the diagram below
for the available options and their function. Note that the faceplate is two-sided and reversible. If the display mode is
changed to lambda, the faceplate may be flipped to display the corresponding lambda scaling. Please reference the
Faceplate/Bezel Installation section in this manual for instruction on this process. The oxygen percentage display mode
may be selected but the outer "needle" LEDs will be non-functional and, thus, there is no corresponding faceplate for this
mode. The center display will indicate the current sensor reading numerically or four dashes "----" if the current mixture is
full lean (> 20:1 AFR).
Calibration
Calibration
The supplied UEGO sensor is factory calibrated via a trim resistor, integral to the sensor connector, and requires no
further calibration. The ability to perform a free air calibration is provided for users that wish to do so. A free air calibration
can be used as a sensor ages, however, new sensors should use the resistor calibration for best accuracy.
Resistor Trim Calibration Mode (rCAL)
This is the X-Series UEGO controller's default mode as shipped from the factory. It is the recommended calibration mode
and, for most users, no further action or calibration is required.
Free Air Calibration Mode (ACAL)
Refer to the Operation section of this manual for instruction on how to navigate to the menu selection ACAL
.
The sensor
MUST be removed from the exhaust for this procedure. The free air calibration process begins once the ACAL menu
option selection is confirmed. The calibration will take approximately ten to fifteen seconds during which the sensor must
be placed in a "fresh" air environment, i.e. an area without lingering exhaust or chemical fumes. The process will
complete and the gauge will report PASS or FAIL on the display. If the gauge reports FAIL then the sensor detected too
low a level of oxygen; this is typically indicative of a sensor being left in the exhaust pipe or in an environment with excess
exhaust/chemical fumes.
