Installation Manual

4 Wiring VSS or Pulse Vehicles

4.1 Locating the VSS (Vehicle Speed Signal)

The VSS or VSO (Vehicle Speed Output) usually originates near the transmission

output shaft. From there it travels to the engine control computer, speedometer and

the cruise control computer. Pick a location to tap the circuit near the engine control

computer interface, reducing risk of incorrect data due to ignition noise. Also, as with

any electronic accessory, a good ground connection is necessary. Improper

grounding could result in a ground loop condition, which may affect the accuracy of

the unit.

Note

Roseman can provide you with an aftermarket catalog for VSS wire,

its color, and how many pulses per mile for the vehicle.

4.2 Connect speed or hour data to the FJ3

The instructions for this procedure depend on the type of vehicle

To view how to capture vehicle data, refer to the Error! Reference source not f

ound.

Note:

FJ3 will not function properly if an “Ignition On/Off” wire is not

connected to the DC-EO terminal. FJ3 goes into Sleep mode

(Power Save) 30 minutes after ignition off.

4.2.1 Connect the FJ3 an Odometer

There are two possible odometer connections:

▪ Direct from an electronic odometer or a speedometer.

▪ From a mechanical odometer via a Reed type odometer adaptor. Also known as

a pulse transducer or “taxi tap”

Note:

If you are recording the vehicle's engine hours, you may skip this

section and go on to section Error! Reference source not found.

REF _Ref455244593 \h Error! Reference source not found..

4.2.2 Electronic Odometer or Speedometer

If the vehicle has electronic instrumentation, run a single wire from the vehicle speed

sensor output VSS /VSO + signal to the FJ3 and connect it to "VSS". (See figure 3)

4.2.3 Reed Type Mechanical Adaptor

If the vehicle has a mechanical odometer, and using a Reed type adaptor, run two

wires to the FJ3 and connect it to " BAT(+)" and "VSS". (See figure 3)