US Shift 4R70W, Инструкция по установке и эксплуатации, Страница: 18 / 36

18
OPTIONAL FEATURES
Speedometer Output
We have provided an adjustable speed signal output on the tan wire on pin 12 of
the vehicle connector that can be used to drive an electronic speedometer. Use
of this output signal is not necessary, but it can be helpful if your speedometer
can not be driven correctly from another source. This signal can also be
corrected for different gear ratios and tire heights, so it can be very useful in
some applications. The speedometer output signal is provided as a 12 Volt
square wave or 5 Volt AC signal. The speedometer output modes can be
selected via the built-in tuning interface in Setup Menu>SpeedoOut or in the
tuning software. After entering the SpeedoOut menu, the current mode and ratio
will be displayed. Push the knob to configure speedo out options. You can
choose between 5V AC, 12V Pulse, Disable, Replicated, Adjustable, and Reset
SPO. After making your choice, you can then fine tune the speedometer ratio
using the knob. Choosing replicated will provide an amplified and squared
replica of the speed sensor signal on the speedometer output. Reset SPO will
clear all saved data for the speedometer output and revert to using values from
the tune.
The speedometer output is adjustable and is essentially the electronic
equivalent of a ratio corrector gear box for a mechanical speedometer. When
adjusting the speedometer output, the correction factor is entered as a decimal
number. The correction factor is the frequency ratio of the speedometer output
frequency to the speed sensor frequency. This number can be easily adjusted to
synchronize the vehicle speedometer to a GPS or other instrument. If you have
a 4WD transfer case with low range capability and want the speedometer to be
accurate while in low range, you will need to adjust the speedometer ratio in
both high and low range. ResetSPO will allow you to use the tune values.
In some cases, such as driving the input of an engine control ECU, the 0-12 Volt
square wave signal will not be able to properly drive the device that it is
connected to. This is because some devices are only designed to accept an
input signal from a variable reluctance (magnetic coil) sensor. Because of this,
they may expect the input signal to swing below ground (0 Volts). To drive this
type of input, use the 5 Volt AC signal mode. In this mode, the driven device will
see a -2.5V to +2.5V signal.