Floscan 9000-20B-1 GPS Interface System - Manual (Page 23)

8/30/2004 7000-044-00D
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
5. Move the voltmeters’ negative lead to the White (Signal) wire. With engine idling, measure and record the voltage reading.
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 readings across the Red & White, (Port Sensor) and Red & Brown, (Starboard Sensor) signal wires. The MFI voltage
readings should match the Sensor readings. This verifies that the Sensors’ signal is reaching the MFI. If not there is a wiring
problem.
_________ VDC
V. 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. You will be testing 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)
VI. TACHOMETER PROBLEMS
Note: Refer to the engine owners’ manual, wiring diagram, installation, and calibration instructions for parts A, B, & C below.
A. NO READING.
1. Check continuity of the YELLOW and VIOLET Tachometer signal wires, (Section V). Verify that the tachometer signal
wires are connected at the correct signal output point.
B. HIGH OR LOW READINGS.
1. Verify that Tachometer is calibrated correctly.
C. FLUCTUATING READINGS.
1. Listen to your engine(s). If engine speed cycles up and down, (when idling or underway) the tachometer reading will
follow. This does not indicate a problem with the Tachometer, but may indicate engine problems.