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6.2.1 Fuel Level Sender – Special Case
You will need to know the resistance of the sender at 0%, 25%, 75%, and 100% fuel
levels. The resistance values must be either monotonically increasing (e.g. 1, 2, 3, 4, 5)
or monotonically decreasing (e.g. 5, 4, 3, 2, 1).
If you have an
electronic sender that outputs a voltage between 0 and 5V you can use it
on the GSC400. You must convert the voltage output to a corresponding resistance so
you can enter it in the menu. To do this, use the following formula:
Resistance = (Voltage Output x Pull-up Resistance) / (5 – Voltage Output)
Where:
Voltage Output – the voltage read at the output of the fuel sender
Pull-up Resistance – in Ohms and depends on the analog input. It is 1000 Ohms for pins
2, 3, and 4; and 5110 Ohms for pins 4, 6, and 7.
Only pins 2 and 6 will give the full range of the sender. The other inputs have a gain of
three which will multiply the analog signal of the electronic sender three times thus
limiting it to the range 0V to 1.33V.
It is recommended to use pin 6 because its 5.11k Ohm pull-up will have less of an effect
on the voltage output of the electronic sender than the 1k Ohm pull-up of pin 2.
In the Fuel Level menu (located in the Advanced Setup menu) you will also need to set
the controller type or hardware version (LS/LX, or LSB/LXB). The controller hardware
version can be found on the back label contained in the product number (under the bar
code). Section 3 on page 9 explains how to read the product number.
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