Help my Gryphon does NOT work

[Jackpine]

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.

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

[Sburn]

Originally Posted by JackandJanet

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

The DC-DC converter is probably a single-chip that sells for a buck or two in quantity. But I'm not busting open my Gryphon to find out.


I'm fine with: Input 12 V ---> |Magic Happens| ---> Output 18V


Good, safe idea from the Blue Oval folks. You've probably noticed during programming that the gauges, fuel pump, etc all shut off. Imagine a plain 12 volts getting shorted onto the programming line from some miswired or faulty aftermarket scanner while somebody is driving. Or a very bad stereo installation. PCM sees that misdirected 12V and shuts down all inputs and outputs thinking it's getting reprogrammed. Not going to be a good ending in a moving vehicle. Requiring 6 volts above the normal 12V to put the PCM into that mode pretty much rules out the possibility of all but an intended PCM shutdown.

[mmandley]

Update.

I just received the new Gryphon in the mail again today. Goign to Hook it up again in a bit and see if its works.

< keeps fingers crossed >

[88Racing]

Glad to hear you got it back!

Lars

[mmandley]

Ok got it reinstalled and now the frustration sets back in.

Exact same problem as before.

Programmer initializes and does its thing.

Gets to clearing Checksum file and then says

Checksum File Failed and lists the Hex code and does nothing after that.

All i can say at this point is im very disappointed.

[Jackpine]

Maybe, just maybe, there's a missing "stock file"? It would not be your fault, but it WOULD take the Mad Doctor's intervention.

From everything I'm seeing, your truck would not have a "prior tune".

But, it's clear Bill is going to have to work with you personally. I'll try to get his attention in the Moderator's forum.

- Jack

[88Racing]

Checksum failure=The mad doctor's help

Have you always owned the truck or was it bought used?

If you bought it used that maybe where the problem is from!

Lars

[Jackpine]

I think he bought the truck new, Lars. That's why I'm totally at a loss here.

Wonder how Corey's doing? Bill can't be spread much thinner than he already is!

- Jack