micro-trak FLOWTRAK II, Reference Manual

Page: 32 / 44

CONSOLE
The only way to field test a console is to con nect it to a
harness on a vehicle with a known working console or install
it on an E-POP (Elec tron ic Point of Purchase) dis play stand.
HARNESS
The harness can be checked using an ohm me ter or continuity
tester. The main wiring diagram shows the pin out of all
connectors. See page 8.
ELECTRICAL INTERFERENCE
Erratic operation of the system may be the result of electrical
interference from ignition wires or inductive loads (electrical
clutch, fan, solenoid, etc.). Always try to route wires as far
away from suspect areas as possible. If problems occur, you
may need to relocate the console and/or wiring harness, or
install a noise suppressor.
POWER
Check power source with the MT-101 or a test light. If there
is no pow er, trace cable toward battery look ing for breaks.
Also check any fuses or circuit break ers that supply pow er to
the console.
ACCESSORY POWER
The speed, flow and run/hold cables all have an ac ces so ry
power wire. Check for 12 volts between B (usu al ly white) and
C (usually black) of these con nec tors. If power is not present,
make sure the ac ces so ry pow er wire is not open or shorted
to ground or to another wire. If this wire has a prob lem, the
con sole may ex hib it erratic behavior or not function at all.
RUN/HOLD HALL-EFFECT SENSOR
Caution: Improper connection or voltage could damage the
Hall-Effect sensor. The Hall-effect sensor works similar to a
reed switch, but requires power in order to function. This
particular type of Hall-effect sensor “closes” when near the
south pole of a magnet and is otherwise “open”.
Ground pin C (black) and connect clean 12 volts to pin B
(white) of the Hall-effect sensor cable. Connect the positive
lead (red) of an ohmmeter or continuity tester to pin A (red)
and the negative lead (black) of the ohmmeter or continuity
tester to pin C (black) of the Hall-effect sensor cable.
Holding the tip of the sensor up to the south pole (face with
dotted line) of a magnet should result in a very low resistance
(around 300 ohms). Taking the sensor away from the magnet
should result in a very high resistance (infinite).
RUN/HOLD JUMPER DUST COVER
To test for proper continuity on the jumper wire, connect the
ohmmeter to the pins of the dust cover with the jumper wire.
There should be continuity — near zero ohms.
Troubleshooting
(cont)
Checking Individual Components
32
MAGNETIC HALL-EFFECT SPEED AND FLOW SENSORS
Caution: Improper connection or voltage could damage
the Hall-effect sensor.
The Hall-effect sen sor works similar
to a reed switch, but re quires pow er in order to func tion.
Also, this par tic u lar type of Hall-effect sen sor re quires al ter-
nat ing magnetic po lar i ties in or der to switch. This means that
the north pole of a mag net will “open” the Hall effect and the
south pole of a magnet will “close” the Hall effect.
Ground pin C (black) and connect clean 12 volts to pin B
(white) of the Hall-effect sensor cable. Con nect the positive
lead (red) of an ohmmeter or con ti nu ity tester to pin A (red)
and the negative lead (black) of the ohmmeter or continuity
tester to pin C of the Hall-effect sensor cable.
Holding the tip of the sensor up to the north pole of a magnet
should result in a very high re sis tance (in fi nite), while holding
the tip of the sensor up to the south pole of a magnet should
result in a very low resistance (around 300 ohms).
VANSCO RADAR SPEED SENSOR
Carefully check your installation and operating instructions.
The following are tips for troubleshooting;
1. Disconnect the radar adapter cable from the console
harness.
2. Check for 12 VDC between pins B and C of the main har-
ness connector (yellow tie). If not present, console or
harness may be defective.
3. Using a jumper wire (paper clip bent into a “U”), rapidly
short together positions A and C of the main harness
speed connector (yellow tie) several times. The console
should respond with some reading. If not, the console or
harness may be defective.
4. Reconnect the radar adapter cable to the main harness
speed connection (yellow tie).
5. Disconnect the radar from the radar adapter cable.
6. Check for 12 VDC between pins 1 and 3 of the radar
adapter connector. If it is not present but was present in
step 2, the radar adapter cable may be defective.
7. Using a jumper wire (paper clip bent into a “U”), rapidly
short together positions 2 and 3 of the radar connector
(round 4-pin) several times. The console should respond
with some speed reading. If not but had a reading in step
3, the radar adapter cable may be defective.
8. If the system passes all above tests, the radar may be
defective.