US Shift 4R70W Installation And Operation Manual page 19

4x4 Low Range Detection:
Low range detection can be enabled if you want the controller to switch to an
alternate calibration table when 4x4 low range is engaged. Configure the
options in Shiftware under the "2WD/4WD Options" and "Table Select" tabs in
the settings window. For example, 4x4 low range detection can be enabled so
that when ground is applied to pin 5 (purple) of the vehicle harness, the
controller will switch to table 2. Other options include holding the O/D switch for
2 seconds or single-clicking the controller knob to enable 4x4 low range
calibration. Up to 3 low range ratios can be used. Whenever 4x4 low-range state
is changed, it will be scrolled on the controller's display (4HI, 4Lo, 4L2, 4L3).
Speedometer Output:
We have provided an adjustable speed signal output that can be used to drive
an electronic speedometer, if desired. 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 normally provided as a 5 Volt square wave, but it can also be
configured to provide a 12 Volt square wave when required (please refer to the
"jumper settings" document for more information).
There are two speedometer output modes that can be selected via the tuning
software or the built-in tuning interface. It can also be disabled if not used. In the
replicated speed sensor output mode, the speedometer output provides an
amplified and squared version of the original speed sensor signal. Replicated
mode is useful for applications that require a signal with the exact pulse rate of
the speed sensor being used. There is also an adjustable corrected mode,
which is very useful for correcting speedometer errors or providing unusual
speedometer output signal frequencies.
Adjustable mode is essentially the electronic equivalent of a ratio corrector gear
box for a mechanical speedometer. In adjustable mode, 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.
In some cases, such as driving the input of an engine control ECU, the 0-5 Volt
(or 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 included capacitor to "offset" the DC
value of the speedometer signal to 0 Volts. As a result, the driven device will see
19