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Old 12-23-2016, 04:04 PM
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Question open loop operation and LTFT (Vince)

Quick question and confirmation on engine management system operation, fuel delivery in particular, and just in case there could be some exception(s), lets try to rule them out by considering just Ford vehicles, and vehicles using O2 sensors rather than AFR (ie, not the latest/newer technology). With that said, now the question....... when a vehicle is running in open loop, will the PCM ever make use of LTFT data stored in KAM or will it rely solely on preprogrammed data?

*Pretty sure it's all preprogrammed data, but curious to verify. TIA!
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Useful Ford Vehicle Resources:

Owners Manuals >>> http://www.fleet.ford.com/partsandse...owner-manuals/
Build Information (click on "vehicle") >>> https://www.etis.ford.com/
Wiring schematics and TSB's (click on "technical information") >>> http://bbbind.com/
Repair guides, includes schematics w/connector pinouts >>> http://www.autozone.com/repairinfo/r...nfoLanding.jsp

Last edited by CowboyBilly9Mile; 12-23-2016 at 04:08 PM.
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Old 12-23-2016, 05:22 PM
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Not 100% sure but I believe it's all preprogrammed.
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Old 12-23-2016, 05:53 PM
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pre-programmed it all depends on the 02 sensors.
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Old 12-23-2016, 09:48 PM
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That's what I always thought, LTFT history means absolutely nothing during open loop operation. Thanks!
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-Bill

-Life is far too short to be serious all the time. So if you can't stop and laugh at yourself along the way, give me a call and I'll do it for you.

04 Ranger Fx4 Level II, 5R55E, Sonic Blue Pearl, loaded.


Useful Ford Vehicle Resources:

Owners Manuals >>> http://www.fleet.ford.com/partsandse...owner-manuals/
Build Information (click on "vehicle") >>> https://www.etis.ford.com/
Wiring schematics and TSB's (click on "technical information") >>> http://bbbind.com/
Repair guides, includes schematics w/connector pinouts >>> http://www.autozone.com/repairinfo/r...nfoLanding.jsp
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