Floscan Series 9700/97000 Standard Flow GPS Interface System (twin engine model) - Manual (Page 37)

8/30/2004 7000-074-00D
FloScan Instrument Company, Inc. Tel: (206) 524-6625 Fax: (206) 523-4961
3016 NE Blakeley Street, Seattle, WA 98105 Email: [email protected] Http://www.floscan.com
NOTE: This may not be seen on digital voltmeters.
4. With engine(s) idling, measure and record voltage between the RED power and BLACK ground wires on the
Return Sensor, (If used). Voltage should be 12 to 14 VDC. ___________VDC
5. Move the voltmeters’ negative lead to the White (Signal) wire. With engine idling, measure and record the
voltage. Readings between 4 and 10 VDC usually indicate a good sensor. ___________VDC
6. Stop the engine and observe the voltmeter. Voltage readings should fluctuate between a high of 9 to 12 VDC,
and a low of 0 to 4 VDC as the Sensors’ turbine slows to a stop. ___________VDC
NOTE: This may not be seen on digital voltmeters.
7. The Sensor(s) may be defective if voltage readings in steps 3 & 5 remain constant. ___________VDC
8. If signal voltages in steps 3 & 5 are ok, go to the backside of the MFI Instrument. With engine(s) running,
measure and record voltage across the Red & White, (Forward Sensor) and Red & Brown, (Return Sensor)
signal wires. The MFI voltage readings should match the Sensor readings. This verifies that the Sensors’ signal
is reaching the MFI. If voltage is not present, there is a wiring problem.
___________VDC
V. MFI SENSOR INPUT TEST
1. Disconnect the WHITE and BROWN signal wires at the MFI Instrument harness. Connect a course thread, (½ -13) or similar
non-plated bolt to the Black wire.
2. Run the WHITE wire up and down the bolt threads. This generates a pulse, which should make numbers in the GPH window start
counting up. The totalizer should also eventually start counting. Faster movements give higher readings.
3. Run the BROWN wire up and down the bolt threads. This generates a pulse, which should make numbers in the GPH window
start counting up. The totalizer should also eventually start counting. Faster movements give higher readings.
VI. CONTINUITY TEST
1. Continuity testing requires access to the back of the Instrument and an Ohmmeter. It verifies that wires are not broken, shorted to
ground, another wire, or to power. Before starting, secure all power, and disconnect the Molex connector from the Instrument.
This test checks the WHITE, BROWN, YELLOW, VIOLET, and BLACK wires.
2. Disconnect the WHITE and BLACK wire harness conductors from the WHITE and BLACK Port Sensor
wires. Connect a jumper from the WHITE wiring harness conductor to a known good ground. At the Molex
connector, connect an Ohmmeter lead to its’ WHITE wire. Connect the other Ohmmeter lead to a known good
____________
ground. The Ohmmeter should read approximately 0.1 to 3 Ω.
(Ohm Reading)
3. Disconnect the BROWN and BLACK wire harness conductors from the WHITE and BLACK Starboard
Sensor wires. Connect a jumper from the BROWN wiring harness conductor to a known good ground. At the
Molex connector, connect an Ohmmeter lead to its’ BROWN wire. Connect the other Ohmmeter lead to a
____________
known good ground. The Ohmmeter should read approximately 0.1 to 3 Ω.
(Ohm Reading)
4. Disconnect the YELLOW wire harness conductor from the Port Tachometer Sender. Connect a jumper from
the YELLOW wiring harness conductor to a known good ground. At the Molex connector, connect an
Ohmmeter lead to its’ YELLOW wire. Connect the other Ohmmeter lead to a known good ground. The
____________
Ohmmeter should read approximately 0.1 to 3 Ω.
(Ohm Reading)
5. Disconnect the VIOLET wire harness conductor from the Starboard Tachometer Sender. Connect a jumper
from the VIOLET wiring harness conductor to a known good ground. At the Molex connector, connect an
Ohmmeter lead to its’ VIOLET wire. Connect the other Ohmmeter lead to a known good ground. The
____________
Ohmmeter should read approximately 0.1 to 3 Ω.
(Ohm Reading)
VII. TACHOMETER PROBLEMS
Note: Refer to the engine owners’ manual, wiring diagram, installation, and calibration instructions for parts A, B, & C below.
A. NO READING.