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Force MPG Sensor
MENU UltraGauge Setup .. Compatibility ..
Force MPG Sensor
Forces UltraGauge to use the MAF or MAP sensor to calculate fuel usage. (Contact Support before use)
Force MPG
Sensor Setting
Description
Auto UltraGauge automatically determines the best sensor to use. In this mode, UltraGauge will use the following in
the priority order shown, if present.
ECU: MPG data directly output by ECU
MAF: MPG determined via the mass of air into the engine and several other engine sensors
MAP: MPG determined based upon intake manifold pressure and several other engine sensors.
None: ECU, MAF and MAP are not present. This is unlikely. Try “Enhanced” or “Safe” gauge discovery methods
and ensure that the ignition is in the RUN position, engine off during gauge discovery
MAP UltraGauge is forced to use the MAP sensor
MAF UltraGauge is forced to use the MAF sensor
Normally Auto is the correct and desirable setting. Please do not change this setting unless you must.
Certain vehicles misreport the presence of sensors. When this happens, UltraGauge is not able to calculate the fuel usage and
various mileage gauges may display “Err” or nonsensical values. All other gauges will display correctly. This setting is used to
override the reported sensor present and forces UltraGauge to use the selected sensor. This problem is common on F250 and
F350 Ford diesel trucks. Typically the presence of MAF is reported when it is not present. In this situation, setting “Force MPG
Sensor” to “MAP” will resolve the issue. For all other vehicles, the use of this setting is very rarely needed.
Injector Cutoff
MENU UltraGauge Setup ..
Injector Cutoff
While in gear during de-acceleration, many vehicle manufacturers will turn off the fuel injectors in order to save fuel. This is
true for vehicles with either manual or automatic transmissions. The fuel savings is slight, but over time and distance could
become significant. UltraGauge can detect when the injectors are switched off and factor the fuel savings into the fuel usage
and mileage calculations.
Injector cutoff is disabled when set to zero, and is disabled by default. To enable Injector cutoff detection, set the value equal
to seven times the engine size in liters, rounded up to a whole number. For example, for a 2.3L engine the value should be set
to 2.3x7= 16.1 17. The value is not crucial and this calculation represents a best estimate.
When enabled and injector cutoff occurs, the Instantaneous MPG will read 999.9, and the Instantaneous Gallons/hour will read
0.0
Injector Cutoff should only be seen when de-accelerating. If during heavy acceleration, Injector Cutoff falsely occurs, decrease
the injector cutoff value by 20% or until cutoff no longer occurs. Setting the value too low will cause the Injector Cutoff to
never be detected.
NOTE: Injector cutoff detection should be enabled prior to performing fuel calibration. If enabled after calibration, the
calibration procedure should again be performed.
NOTE: If the open/closed loop indicator is not displayed on the gauge display or the loop is always open, then the vehicle does
not support Injector Cutoff detection and this feature should remain disabled. If the loop indicator is always open, this could
indicate an issue with your vehicle. If so, check for the presence of trouble codes.
NOTE: Nearly all Diesel vehicles do not operate a closed loop system, and as such do not support the open/closed loop
indicator. UltraGauge does not support injector cutoff for Diesel vehicles.
NOTE: Each vehicle manufacturer has their own algorithm for injector cutoff. Some require significant de-acceleration,
usually enabled in terms of higher RPMs and a certain speed threshold, while others have a much lower de-acceleration
requirement.
NOTE: When the transmission is placed in neutral, the vehicle’s injector cutoff function is disabled.
NOTE: This is an optional setting and provides only marginal benefit to fuel usage and MPG calculations.
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