Thread: Combining Tunes
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Old Sun, November 15th, 2009, 10:08 PM
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From Cartechbooks:

"Ford EECs convert most voltage inputs from sensors (MAF, TPS, etc.) into an A/D count before actual processing. Some software packages normalize this to only show voltage values in the editor; others leave it as counts. The actual scaling depends upon the clock speed of the processor being used, but it always works out such that 0 to 5v reference signals become 0 to 1,023 A/D counts."

It's just the way the PCM relates to input voltages....without using actual voltage. You can assume that 512 A/D counts will be 2.5 volts. Just keep in mind that the A/D on most sensors....especially the TPS...will never be 0 counts but more of a minimum of 70-80 counts.
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