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10-18-2011
any you guys know what actually triggers the P0171 to go off in our PCMs?
Im doing some open loop stuff to save some gas and was wondering if its a certain afr that sets it off? I keep throwing it even though Im running a little rich even...
depending on what throws it I may just delete it from the PCM since I tune in open loop anyway...
P0171- system too lean
thanks
Jarred
10-19-2011
2 consecutive diagnostic tests that fail.
Fail is determined by the pcm having the ltft at more than 16.4 IIRC.
10-19-2011
In open loop, the pcm can remember fuel trims from when it has ran in closed. Be sure to clear any fuel trims before you switch to open loop.
10-19-2011
by clear do you mean just reset them when I switch to open loop or do I have to do something in the closed loop section of the tune itself?Originally Posted by darkhorizon
sorry just confused by what you mean by "clear" the trims...
10-19-2011
There is a command you can send with powertuner using the powertuner scanner that says "clear fuel trims".
10-19-2011
What about with HPtuners?
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