Atap question: Closed loop or open loop?
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From: On the Bumper!
Atap question: Closed loop or open loop? Can anyone tell me which table shows what loop the PCM is in at a given time? I bet this is a silly rookie question, but I am baffled. Thanks! 
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Joined: Feb 2003
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From: Austin, TX
with A-tap, the only thing that would really say if you were in open or closed loop would be to monitor the Fuel Trim Cells. If you had EFILive, I believe that tells you if its in open or closed loop mode, could be mistaken on that though
There is a generic scan tool PID (called {SAE.FUELSYS} in EFILive) that will show you the fuel loop open/closed status. So *all* scan tools should support it.
It will be called something else in AutoTap but it is there.
Look for something like "fuel system status".
The actual SAE names are:
Fuel System 1 Status.
Fuel System 2 Status.
It will report 1 of 5 states for each fuel system.
Regards
Paul
It will be called something else in AutoTap but it is there.
Look for something like "fuel system status".
The actual SAE names are:
Fuel System 1 Status.
Fuel System 2 Status.
It will report 1 of 5 states for each fuel system.
Regards
Paul
