Quote:
Originally Posted by Sburn
Both you and mmandley correct about both 12 and 18 volts being needed. Ford uses an 18V signal on one of the DLC connector pins to initiate programming:
"FEPS: Flash EEPROM Programming Signal. 18 volt DC signal sent by the scan tool to initiate PCM reprogramming."
Since there's only a nominal 12V from the battery, I would assume that Gryphons and the like have a DC-DC converter to up 12V to 18V for that one pin during PCM programming.
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THAT'S pretty amazing! I wouldn't have thought there would be a voltage converter in the Gryphon. Still, I can see how this "feature" keeps the EPROM from being programmed accidentally.
- Jack
Mon, May 4th, 2009, 09:29 PM
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