Jamar RAC-100, Руководство пользователя

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RAC-100 and 200 User’s Manual
5-4
sensor. Make sure you have a good electrical connection at the tap in
point. Once you are sure you tapped into the correct location, it is
always better to wire solder the connection.
After checking the connection, plug the VSS Input connector back into
the MDS and try the DMI again.
4. Perform a Tap Test. The Tap Test will determine if the distance
pulses being sent from the MDS are getting to, and being processed by,
the DMI. The Tap Test is performed using the rotary switch on the
MDS. First make sure you note the current position of the rotary switch
(1, 2, 4, 8,16, 32 or 64), as you will have to return the slot back to this
same position after the test is completed.
Next, turn on the DMI. Press the C-HOLD key just like you were be-
ginning to measure. Using a small screwdriver, rotate the switch be-
tween the Tap and Test positions four or five times. (Note that when
the switch is turned clockwise until it stops, it is at the Test position.)
The DMI should register. The count shown does not matter, just as
long as the DMI did register a count. If it did count, the cable from the
MDS to the DMI and the instrument itself are OK. If the DMI did not
count, the problem is most likely a bad cable to the DMI or the DMI
itself is bad. If available, try another DMI and repeat the Tap Test. If
the second DMI doesn’t count, the problem has to be the cable be-
tween the MDS and the DMI.
Once the test is complete, return the Rotary Switch to the previous
position.
5. If after checking these items the DMI still does not count, contact us
using the information on page ii.
Q. My DMI counts while the vehicle is not moving. What's wrong?
A. There are three possible causes for this.
1. Your wiring may be picking up stray pulses from the vehicle. This
can occur if the wiring is too close to the alternator, spark plugs, dis-
tributor cap or engine coil.