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Fuel trim 250a Long Term Fuel trim Malfunction

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Posted on Jan 02, 2017

ZJLimited
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SOURCE: what does fault code ECM - 250A long term - fuel trim:upper limit on 2004 volvo S40 mean

Sound like a problem with the MAF sensor, try replace.

Pulled codes for ECM-250A long term fuel trim upper limit, inspected and found air mass sensor failing internally, should show 4 f/s at idle and is showing 2.98 f/s at idle. Recommend replacing with new.



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Posted on Jul 09, 2012

ZJLimited
  • 17970 Answers

SOURCE: what causes the following faults code on 2004 volvo S40 :ECM-250A LONG TERM-FUEL TRIM:UPPER LIMIT,BCM-0100 COMMUNICATION PROBLEM WITH ECM,EPS-0082 ENGINE STATUS FAULTY SIGNAL,CCM-001 COMMUNICATION CON

Check, test or replace MAF sensor.

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Posted on Jul 09, 2012

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This a picture of the freeze frame for my 99 lexus Rx 300. I would like to know what it means and are these normal parameters?


Yes, looks normal, and good. Calculated load is not much meaning, as it changes constantly. ECT of, oh that is centigrade, not sure how that translates to Fahrenheit, but it may be low from not running long...
Your fuel trims (both short term and long term-STFT, LTFT) are very good-showing that fuel is not being added or subtracted by the computer to maintain correct air/fuel ratio. Fuel trim numbers should be close to zero. It is when fuel trim changes by double digits-either positive or negative-that there is an indicated problem. For example, say you had a vacuum hose leak- sucking in extra air to the engine- then you could see STFT number go positive by double digits-meaning the computer senses a lean condition and is adding fuel to compensate. But your fuel trims show the air/fuel ratio must be correct-no change in fuel trims-the positive 2.3 in LTFT is negligible- not a problem.

Nov 07, 2016 | 1999 Lexus RX 300

1 Answer

I had an diagnostic test done on my 2007 kia optima and it read p0170 fuel trim (bank1) what does this mean


code p0170 refers to two problems
fuel trim bank 1 --malfunction
heated oxygen sensor(HO2S) 3 bank1 --circuit malfunction
for the first error==causes-- intake leak --AIR system---fuel pressure /pump---injectors--EVAP canister purge valve---HO2S
for the second one ===causes=--wiring--HO2S---ECM
The explanation of fuel trim is long winded and you may get some typo errors but I think that you will get the idea
short and long term fuel trim refers to the strategy used to reduce exhaust emissions after a basic computation of injector period, using engine load as a major parameter
both front and rear oxygen sensors signals are used to fine tune the air/fuel mixture by increasing or decreasing the injection period =/- 25% above or below the basic level
any fault requiring a correction beyond this level will result in a fault code being logged ( in this case p0170)
the fuel trim will oscillate the injection period =/- 5% above or below the mean level level A
manufacturing and in-service tolerances of load sensors (MAP,MAF, VAF) and injectors in particular and faults such as intake leaks( vacuum hoses from vent controls and transmission) will affect the air/fuel mixture and cause the trim to compensate
an air intake leak for instance would increase the injection period increasing for example to 115-125%. this level will also oscillate +/- as before level B
this new short term fuel trim level will be stored in the ECM if it is established as a new basic mixture level
It will become a long term fuel trim correction and results in the correct mixture level immediately after starting, even when the HO2S has had sufficient time to heat up
Now having some idea of what trim is, you will see the necessity of repairing any problem sensors ,air leaks ,vacuum leaks
You will also probably understand the reason of why an engine after running short runs ( city driving) feels that it gets more power and better economy after 1/2 hour on the open highway
The ECM resets the trim to the new load power settings and that becomes the new trim

Mar 13, 2015 | 2007 Kia Optima

1 Answer

Ecm 250a volvo


Error description:
ECM-250A Long-term trim - Upper Limit

Feb 05, 2014 | 2008 Volvo C30

1 Answer

What causes the following faults code on 2004 volvo S40 :ECM-250A LONG TERM-FUEL TRIM:UPPER LIMIT,BCM-0100 COMMUNICATION PROBLEM WITH ECM,EPS-0082 ENGINE STATUS FAULTY SIGNAL,CCM-001 COMMUNICATION CONTROL...


Check, test or replace MAF sensor.

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

Jul 09, 2012 | 2004 Volvo S40

1 Answer

What does fault code ECM - 250A long term - fuel trim:upper limit on 2004 volvo S40 mean


Sound like a problem with the MAF sensor, try replace.

Pulled codes for ECM-250A long term fuel trim upper limit, inspected and found air mass sensor failing internally, should show 4 f/s at idle and is showing 2.98 f/s at idle. Recommend replacing with new.



Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

Jul 09, 2012 | 2004 Volvo S40

1 Answer

2002 Ford Mustang GT I used OBD-II to get the trouble codes, I got P0174,P0301,P302,P316 Freeze Frame Information: 1. DTC for which Freeze Frame was Stored - P0174 2. Fuel System 1 Status - Closed...


Because you got a misfire on cylinder #1 PO301
A misfire on cylinder #2 PO302
Misfires first 1000 rev PO316
O2 Codes PO 174
Etc,Etc


The LTT, is the result of not learning (yet-thus long term)
what isn't working correctly---Your Engine

Replace bad Coil--which ever is missing
Do not go by the codes,alone ,TEST

Dec 10, 2010 | 2002 Ford Mustang

2 Answers

Function of oxygen sensor?


It measures the oxygen in the exhaust system, for instance, if the fuel is to rich it sends values to the computer and the computer will adjust the fuel and timing to bring it back into perimeters

Jun 20, 2010 | 2003 Mitsubishi Galant

2 Answers

What is a STFT B1(%) -1.56. WHAT DOES THAT MEAN?


Here is some general information to get you started...
(I am quoting directly from several PDF sources, Googled).

STFT B1 = Short Term Fuel Trim Bank 1. This is the fuel correction percentage being used by the closed loop fuel strategy for Bank 1 (if a V style engine or for all cylinders if an inline engine). If the fuel system is in open loop, this number will be reported as 0%

Fuel trim refers to the feedback compensation value compared against the basic injection time. Fuel trim includes short–term fuel trim and long–term fuel trim.

Short–term fuel trim is the short–term fuel compensation used to maintain the air–fuel ratio at its ideal theoretical value. The signal from the heated oxygen sensor indicates whether the air–fuel ratio is RICH or LEAN compared to the ideal theoretical value, triggering a reduction in fuel volume if the air–fuel ratio is rich, and an increase in fuel volume if it is lean.

Long–term fuel trim is overall fuel compensation carried out long–term to compensate for continual deviation of the short–term fuel trim form the central value due to individual engine differences, wear over time and changes in the usage environment.

If both the short–term fuel trim and long–term fuel trim are LEAN or RICH beyond a certain value, it is detected as a malfunction and the check engine warning (CHK ENG) lights up.

If the total of the short–term fuel trim value and long–term fuel trim value is within ± 25 %, the system is functioning normally.

Apr 07, 2010 | 1998 Jeep Grand Cherokee

1 Answer

P1165 code in my 2001 hyundai santa fe?


I'm not quite sure about the code in Hyundai's case but it definitely relates to fuel trim...

I could try to hash down the explanation for Short term fuel trim and Long term fuel trim in this post but I think a visit to
http://www.wellsmfgcorp.com/pdf/counterp_v6_i4_2002.pdf
would be more thorough and appropriate.

Basically, a high value of long term fuel trim indicates that your engine has had and will have to continue to inject a lot more or a lot less fuel to attain the correct air/fuel ratio for a proper burn, which mainly indicates a malfunction somewhere (could be lots of things)

Aug 27, 2008 | 2001 Hyundai Santa Fe

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