Fuel trims LTFT Low, Mid not adjusting now?
Thread Starter
Joined: Jun 2007
Posts: 2,706
Likes: 15
From: Lexington Park, MD
Alright put a stock rom back on the car with the new egr disable routine, disabled lean spool, rear O2, EGR Solenoid, FPR solenoid, Tephra mod (all disabled) and with the OBDII readiness patch also. Instead of disconnecting the battery to reset the fuel trims I just unplug the MAF and start the car so I get a fault code, plug it back in, clear codes and that resets the fuel trims. Let the car Idle for 35 minutes (2byteAirflow at 33-35hz) and STFT adjusted as it did before, hovering between -1% and 1% yet still no LTFT low adjustment. Took the car out for a 20 minute cruise, and LTFT mid didn't budge either... once I got 2byte Airflow steady, STFT was hovering from -2% to 3% during cruise... IT just sucks that I can't get the LTFT low and mid to log. Again I tried with Evoscan and Mitsulogger with my Injector scaling/latency updated in both... no luck ROMID 96940011
Last edited by Fast_Freddie; Sep 28, 2009 at 01:58 AM.
What did you mean by?
Also, what are your open loop load/throttle tables set to?
Last edited by fostytou; Sep 28, 2009 at 09:03 AM.
(x-128)/5
That is preferable, but shouldn't matter too much compared to the one you are using.
If STFT is only swinging 1% the car may be spot on (but I doubt that).
Otherwise you might want to check if you possibly adjusted the min/max LTFT.
That is preferable, but shouldn't matter too much compared to the one you are using.
If STFT is only swinging 1% the car may be spot on (but I doubt that).
Otherwise you might want to check if you possibly adjusted the min/max LTFT.
EvoM Guru
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From: Tri-Cities, WA // Portland, OR
Evolving Member
Joined: Feb 2008
Posts: 214
Likes: 1
From: South Africa
I have finally got my trims to work correctly and have narrowed it down to 2 Perph bit's that can either be labelled incorrectly or they may be resposble for more than one thing.
This is sepcific to either 96530706/96530006 ROM.
Now it can either be both of them causing the trims not to work in Evoscan or only one, I haven't had the time to narrow it down any further.
They are...
1.)FAA bit2 - Rear O2.
I continually get error P0141 and I put a zero in this bit to stop the code from appearing.
2.) FEA bit15 - P0140 Rear O2 No Act.
I continually get error P0141 and I put a one in this bit to stop the code from appearing.
Once I have done this, my P0141 now doesn't come up any longer but my LTFT don't change from 0.18 if I reset the battery
If I put those two bits back to stock, my LTFT then start logging.
Hopefully that will help those who have the same problem as me with the LTFT in Evoscan.
Edit: I have removed my stock Rear o2 sensor and put the LC1 O2 sensor in it's place. The Rear O2 simulator in Tephra mods is enabled but I still get the P0141 error, which is why I changed those 2 bits mentioned above to kill the P0141 error code.
This is sepcific to either 96530706/96530006 ROM.
Now it can either be both of them causing the trims not to work in Evoscan or only one, I haven't had the time to narrow it down any further.
They are...
1.)FAA bit2 - Rear O2.
I continually get error P0141 and I put a zero in this bit to stop the code from appearing.
2.) FEA bit15 - P0140 Rear O2 No Act.
I continually get error P0141 and I put a one in this bit to stop the code from appearing.
Once I have done this, my P0141 now doesn't come up any longer but my LTFT don't change from 0.18 if I reset the battery
If I put those two bits back to stock, my LTFT then start logging.
Hopefully that will help those who have the same problem as me with the LTFT in Evoscan.
Edit: I have removed my stock Rear o2 sensor and put the LC1 O2 sensor in it's place. The Rear O2 simulator in Tephra mods is enabled but I still get the P0141 error, which is why I changed those 2 bits mentioned above to kill the P0141 error code.
Last edited by SeanV; Oct 1, 2009 at 09:14 AM.
I have finally got my trims to work correctly and have narrowed it down to 2 Perph bit's that can either be labelled incorrectly or they may be resposble for more than one thing.
This is sepcific to either 96530706/96530006 ROM.
Now it can either be both of them causing the trims not to work in Evoscan or only one, I haven't had the time to narrow it down any further.
They are...
1.)FAA bit2 - Rear O2.
I continually get error P0141 and I put a zero in this bit to stop the code from appearing.
2.) FEA bit15 - P0140 Rear O2 No Act.
I continually get error P0141 and I put a one in this bit to stop the code from appearing.
Once I have done this, my P0141 now doesn't come up any longer but my LTFT don't change from 0.18 if I reset the battery
If I put those two bits back to stock, my LTFT then start logging.
Hopefully that will help those who have the same problem as me with the LTFT in Evoscan.
Edit: I have removed my stock Rear o2 sensor and put the LC1 O2 sensor in it's place. The Rear O2 simulator in Tephra mods is enabled but I still get the P0141 error, which is why I changed those 2 bits mentioned above to kill the P0141 error code.
This is sepcific to either 96530706/96530006 ROM.
Now it can either be both of them causing the trims not to work in Evoscan or only one, I haven't had the time to narrow it down any further.
They are...
1.)FAA bit2 - Rear O2.
I continually get error P0141 and I put a zero in this bit to stop the code from appearing.
2.) FEA bit15 - P0140 Rear O2 No Act.
I continually get error P0141 and I put a one in this bit to stop the code from appearing.
Once I have done this, my P0141 now doesn't come up any longer but my LTFT don't change from 0.18 if I reset the battery
If I put those two bits back to stock, my LTFT then start logging.
Hopefully that will help those who have the same problem as me with the LTFT in Evoscan.
Edit: I have removed my stock Rear o2 sensor and put the LC1 O2 sensor in it's place. The Rear O2 simulator in Tephra mods is enabled but I still get the P0141 error, which is why I changed those 2 bits mentioned above to kill the P0141 error code.
Evolving Member
Joined: Feb 2008
Posts: 214
Likes: 1
From: South Africa
Wasn't easy finding the patch to disable the Rear O2 Heater, but I finally got there.
Thread Starter
Joined: Jun 2007
Posts: 2,706
Likes: 15
From: Lexington Park, MD
Looks like that is the problem then... I will have to hunt down the rear O2 heater patch now
Found it... ONLY FOR 96940011 ROM ID!!!
https://www.evolutionm.net/forums/ec...sim-patch.html
Had I seen this post a week ago, it would most likely be fixed already... owned by reading comprehension
Found it... ONLY FOR 96940011 ROM ID!!!
https://www.evolutionm.net/forums/ec...sim-patch.html
Had I seen this post a week ago, it would most likely be fixed already... owned by reading comprehension
Last edited by Fast_Freddie; Oct 2, 2009 at 04:46 AM.
Evolving Member
Joined: Feb 2008
Posts: 214
Likes: 1
From: South Africa
Looks like that is the problem then... I will have to hunt down the rear O2 heater patch now
Found it... ONLY FOR 96940011 ROM ID!!!
https://www.evolutionm.net/forums/ec...sim-patch.html
Found it... ONLY FOR 96940011 ROM ID!!!
https://www.evolutionm.net/forums/ec...sim-patch.html
https://www.evolutionm.net/forums/7302505-post266.html
Edit: Since I don't have to worrying about emissions/passing inspection, I just had to add the lines to my XML file from the link above to surpress the P0141 rear O2 Heater code.
Nice and simple.
Last edited by SeanV; Oct 2, 2009 at 03:36 AM.
SeanV you are the man!
Well done on finding the source of the problem!
Since I'm running a Jap spec, there is no rear o2, so I guess I'll have to run the patch to suppress the CEL.
Once again thank you to SeanV for your efforts, trying this out tomorrow morning!
Well done on finding the source of the problem!
Since I'm running a Jap spec, there is no rear o2, so I guess I'll have to run the patch to suppress the CEL.
Once again thank you to SeanV for your efforts, trying this out tomorrow morning!