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Page 46/63 UltraGauge™ EM User Manual www.ultra-gauge.com
Battery Drain
This discussion generally applies to newer vehicles which use the CAN protocol or vehicles with electrical system issues. When
the ignition is switched from RUN to OFF, the vehicle's electrical system modules stay active drawing battery power for several
minutes. Over time various systems enter lower power modes and the drain on the battery decreases. However, UltraGauge
can cause these systems to not enter low power mode. Normally once UG has detected ignition off, UG will enter a low power
mode and wait for the vehicle's systems to become active at the next ignition on. However, since the vehicle's electrical
systems do not shut down; UG quickly attempts to establish communication again. This communication in turn causes the
vehicle's systems to remain on indefinitely and results in battery drain. Mode 2 resolves this issue.
Vehicles known to experience battery drain
and require “Power on Detect” mode 2
Mini Cooper
2010+ Ford Focus
2011 Ford Fxxx (few)
2007+ BMW Series 5 2.0L
Power off Detect mode
MENU UltraGauge Setup .. Compatibility ..
Pwr off Detect mode
For most vehicles UltraGauge will correctly detect when the ignition has been switched to OFF with the default setting. Should
UltraGauge remain on beyond 15 seconds after exiting the vehicle, use this setting to change the method UltraGauge uses to
detect that the ignition is in the OFF position.
Power Off Detect
Mode
Description
0 (default), 1,2 &4
Modes 0, 1, 2 and 4 operate the same. The only difference is that a different parameter is
read from the vehicles computer. If the vehicle’s computer does not respond with the
requested parameter after “ ” attempts, the ignition is assumed OFF.
Power off retries
These are the preferred options.
3
Whenever the vehicle’s computer returns a value of RPM less than 512 for “ ”
Power off retries
consecutive times, the ignition is considered to be in the OFF position.
5 When the vehicle is running the alternator causes the battery voltage to exceed 13.2V. When
the engine is not operating, the voltage is the actual battery voltage which is typically less
than 12.85V. If the battery voltage is measured to be less than the “ ” for
Bat Low Threshold
“ ” times, the ignition is considered to be in the off position.
Power off retries
See the “Battery Low Threshold” setting for more detail.
If set to mode 5, the “ ” mode is internally forced to mode 2 and the
Power on Detect mode
“ ” setting is ignored.
Power on Detect mode
(This mode is not recommended, and should only be used when all other modes fail)
NOTE: Some vehicles switch the alternator off to save fuel. This mode is not compatible with
such vehicles.
If Power Off (Engine-off/ignition-off) detection is failing, change the mode until UltraGauge can successfully sense that the
ignition is OFF. Modes 3 & 5 have the side effect that UltraGauge will not wake and begin functioning unless the engine is
running. In order to make configuration changes without the need to start the engine, place the ignition in the RUN position,
press the UP and MENU keys simultaneously. This will cause UltraGauge to power on and immediately enter the menu system.
Once in the Menu system the power off detection is not active.
For all modes, increasing “Power off Retries” will reduce the chances of false ignition off detection.
If after changing the mode, UltraGauge will not power on, please follow this procedure:
Unplug UltraGauge
Turn the ignition to the RUN position
Press and hold the Menu key
Plug in UltraGauge
Wait 5 seconds and release the key
This will allow access to the configuration menu. Once in the menu, select a different mode.
Exit the Menu.
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