Gauge name
Range
Units
Abbreviation
Battery Voltage
0 to 65.535
Volts
Bat volt
Battery Voltage
Voltage as measured at the Electronic Control Module. This is typically the same as Battery
voltage.
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Gauge name
Range
Units
Abbreviation
Load absolute %
0 to 95
0 to 400
% Load
abs%
Load absolute %
Alternate to “% Engine Load” this gauge ranges from 0 to 95% for normally aspirated engines
and 0 to 400% for boosted engines. This gauge is linearly correlated to Brake Torque
Gauge name
Range
Units
Abbreviation
AFR commanded ratio
0 to 1.999
AFR cmd
AFR
Commanded
ratio
Fuel Air Commanded ratio. This is the value of Lambda requested by the ECM
= (Stoichiometric F/A ratio) / (Actual F/A ratio) >1 is lean, <1 is rich.
To determine the actual A/F ratio commanded, multiply this value by 14.64
For example. If this value is 0.90, the commanded Air Fuel Ration is 0.90* 14.64 = 13.17
parts air to one part fuel.
Gauge name
Range
Units
Abbreviation
Rel Throttle Pos %
0 to 100
%
Rel TP %
Relative Throttle
Position %
Relative or learned throttle position. A throttle position sensor may never return to its
minimum position, but instead closed throttle may always be greater than the TP Sensor’s
absolute minimum. This throttle position gauge adjusts for this true closed throttle position.
When the throttle is closed, this gauge will read 0% regardless of the details of the absolute
throttle position. The relative position value is calculated as follows:
Relative % = (TP output) – (TP output closed) X 100
(TP output max)
Example: If the output of the TP is 1V when closed and 10 volt when wide open, an output of
5V would be: (5-1)/10*100 = 40%
Note: This means that this gauge will likely never reach 100%
Gauge name
Range
Units
Abbreviation
Ambient Air Temp
º
F
-40.0 to 419.9
º
F
Amb ºF
Ambient Air Temp
º
C
-40.0 to 215
º
C
Amb ºC
Ambient Air
Temperature
Outside ambient air temperature
Gauge name
Range
Units
Abbreviation
Accel Pedal Pos1 %
Ped1 Pos%
Accel Pedal Pos2 %
0 to 100
%
Ped2 Pos%
Accelerator
Pedal Position
The percentage that the throttle Accelerator Pedal is pressed. This is the absolute output from
the accelerator pedal position sensor as a percent of the sensor’s max value. The un-pressed
and fully pressed positions will likely not be equal to 0% and 100% respectively. For
example, the physically un-pressed position may correspond to an absolute position of 8%.
Pedal Position 2 is for vehicles with a second throttle Position Sensor
Gauge name
Range
Units
Abbreviation
Cmd Throttle Pos %
0 to 100
%
Cmd TP %
Throttle Position
Commanded
The percent throttle requested by the ECM. Used on electrically driven throttles.
When the driver presses the accelerator pedal, the ECM converts the output of the Pedal
position sensor to a corresponding throttle position commanded %. The electrical throttle
position drive then opens the throttle by the commanded %.
