Electronics International MVP-50T - Manual (Page 60)

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1. Problem: The IMC is mis-wired.
a) Action: Measure the voltage on the three wires at the IMC Module (Red wire = +5 volts,
Black wire = ground, White wire = +2.5 volts).
Remove the Red wire from the IMC module and check the sensor counts on the
“Fuel Tank Calibration” screen increase. Be sure you are displaying the data for the
correct tank.
Touch the wires between the IMC Module and the probe and check that the sensor
counts increase.
2. Problem: The P-300 Fuel Probe is shorted or there is water or contamination in the tank.
a) Action: Remove the wire from the IMC Module to the center terminal of the P-300 probe.
Ohm the center terminal of the P-300 probe to ground. Check for > 10 M Ohms.
Remove the probe from the tank to resolve any issues.
7.10 Voltage Problem:
Bus voltage is measured on EDC pin 35 of the top connector.
A. Symptom: A. Symptom: A. Symptom: A. Symptom: A. Symptom: Inaccurate, jumpy or zero reading.
1. Problem: Pin 35 on the EDC top connector is mis-wired.
a) Action: Measure the voltage on pin 35 (look for bus voltage).
7.11 7.11 7.11 7.11 7.11 Annunciator Problem: Annunciator Problem: Annunciator Problem: Annunciator Problem: Annunciator Problem:
An Annunciator, displayed on the MVP screen, is monitored with a temperature or resistive fuel level channel
on the EDC. The voltage into a temperature channel must be limited to 2.5 volts. When measuring voltages
above +2.5 volts a VI-221 Module should be used in series with the temperature channel to drop the voltage to
an acceptable level. The voltage into a resistive fuel level channel should be limited to 18 volts.
An Annunciator will be one color for a low voltage and another color a high voltage. The colors are set in the
“4. Redlines, Limits and Color Setup” screen. Note: The color white will be displayed as black or off. You
can also set the trip level at which the Annunciator changes color. The trip level is displayed in sensor counts
so you will need to get a sensor count reading with the Annunciator on and then off. Set the trip level between
the on and off value.
A. Symptom: A. Symptom: A. Symptom: A. Symptom: A. Symptom: The Annunciator is not changing colors.
1. Problem: Mis-wired.
a) Action: Check that the voltage on the appropriate EDC pin changes from high to low and
back to high as the Annunciator is cycled.