Speedometer Interface
A speedometer interface is built into every Ranger EZ radar. It is accessed through the power/signal cord of the
radar. The yellow-colored connector is used for the interface.
The speedometer interface eliminates shadowing and combining by comparing the radar patrol speed to the
speedometer. The module is connected to the vehicle’s VSS (Vehicle Speed Sensor) line, which is located in
different areas in different vehicles. Information for the installation of the speedometer interface in many police
vehicles is included in this section, but please contact MPH for the proper connection if your vehicle is not listed.
The vehicle speed information is also available through the vehicle Control Area Network (CAN). The CAN
network is accessed through the (On-Board Diagnostic connector) OBD2 connector which is typically found
under the steering column in most vehicles. MPH provides a special mating cable to connect to the OBD2
connector.
When the speedometer interface is used, the high-end speed of City/Highway mode is overridden, since the radar
has positive confirmation of the actual patrol speed. The low-end speed limit of City/Highway mode is intact, so
if you want the full speed range capability of the radar, select “Ci”.
Note: The Ranger EZ can be used without the Speedometer Interface being connected to the vehicle, and
the radar will function as normal, with the exception of Auto Stationary and Automatic City/Highway
mode.
The speedometer interface may be tested to verify its proper operation. This test is optional and is not required to
check the accuracy of the radar unit. With the speedometer interface connected to the radar, pressing the Test
button on the radar causes the patrol speed being received from the interface to be displayed in the Lock window
of the radar. The number in the Lock window should match the number on the speedometer within 2 mph. If the
patrol vehicle is stopped the lock window will read “0”. Also, if the vehicle is accelerating or decelerating, the
number may not exactly match the speedometer, since this number is updated approximately every two seconds.
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