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      TIPS & FEATURES AEuro-Forum - READ!!   10/25/2016

      Tips and Features of AEuromotive Technical Site 1.    Quick Peek Feature:       Hover over any Topic/POST within a Specific Forum or NEW POST.  You’ll notice a pop up window displaying the Original (FIRST POST)
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      Features I have added.  I still have a dozen to add to this ANNOUNCEMENT, as we have upgraded this Forum since
      yesterday 10/24/2016.  Stay Tuned!!
Robert Reynolds

ECM Code P0171

16 posts in this topic

Dealing with a P0171 bank 1 sensor one lean code.

Have performed TSB for oxygen sensor and reprogram.

Fuel trim bank 1 short term = -2.0 to +23  long term has about the same numbers but both are intermittent and more

noticeable with the a/c on.

 

List of repairs already performed,,,,Fuel injection and induction service,,new bank 1 air fuel ratio sensor per tsb with

update,,,replace mass air flow sensor ,,,and yes tried another air fuel ratio sensor...

 

Any input to this is and always will be much appreciated!!

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Whats the range of trim on both banks trim? I've seen over and over on Asian stuff where there is a single bank code and the thing shoulda tossed both banks.

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Bank 2 seems to stay below 5.0 of total fuel trim.

bank one seems to do the dance.when the a/c is turned on is when it really seems to be affected.

wanted to add that fuel trims while driving are ok nothing over 5.0..

thanks again for the input.

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Have you done a Smoke-Test on the intake-air and crankcase-ventilation systems? 

 

ALSO, 

I remember coming across a TSB that explained this code as a fuel pressure-loss issue directly correlated to faulty fuel pump assembly. 

 

And Joe is correct; I have had Toyota/Asain vehicles come in with single-bank lean-codes and they were both reading high on the fuel-trim PID.

 

I'll see about digging up the TSB. Stay tuned. 

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ENGINE
Robert, here is the TSB. Cut and pasted from Alldata.

Unfortunately the VIN that you posted is just outside of the applicable range for this TSB. But that doesn't always mean that it wont have the same issue.

   

 

EG028-06
May 1, 2006

Title:
"NO START" IN SUB-FREEZING AMBIENT AIR TEMPERATURES
Models:
'03 - '05 4Runner (2UZ-FE)
TSB UPDATE NOTICE:
The information contained in this TSB supercedes TSB No. EG043-05. TSB No. EG043-05 is now obsolete.
Introduction

Some customers may experience a "no start" condition and/or M.I.L. "ON" with DTCs P0300, P0171, and P0174 after the vehicle has cold soaked in sub-freezing ambient air temperatures. To correct this condition a new fuel pump sub-tank assembly is now available. Follow the repair procedure to replace the fuel pump sub-tank assembly.

 

Applicable Vehicles:

^ 2003 - 2005 model year 4Runner vehicles equipped with the 2UZ-FE engine produced WITHIN the Applicable Vehicle VIN Ranges shown.

 

[the VIN table would not allow me to cut and paste. It tops out at VIN range JTEBT1#R#58026208]

 

Its goes on to explain applicable warranty information, updated parts numbers for specific VINs, labor time, and indicates a TIS service guide instruction to follow (AKA R&R fuel pump assembly) 

 

hope this helps any. 

--MC

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Primary reason for wanting to know the trim of both banks is simple. If both are additive, then it gets simpler, fuel delivery, leak, AF meter, coated upstream O2's

 

One side lean, the other normal I start looking at influences such as injector contamination, partially plugged cats or a small, single side intake leak. (seen a few 3.0 yoda engines with broken bank one end bolts from overtorquing sucking a little air)

 

Quick and dirty AF meter test, grneric calculated load, a hard pull WOT should come damn close to bouncing off 100% on a NA engine. If its under that, clean it, let it dry and rerun it. If it climbs some odds are you just have a lean reporting a/f meter. This is also handy for proving a fix when replacing one for trim faults.

Edited by Joe Piojda

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If fuel pressure is OK, and there are no false air leaks, and the fuel injectors aren't physically restricted, and you've got good quality fuel in the gas tank, and

you have a paper element air filter, NO oil bath air filters allowed !!!!

You have replaced the air fuel ratio sensors are factory Nippondenso sensors, I suggest you clear your fuel trims (adaptations) by unplugging the

battery leads shorting them together and turning the ignition switch on for 10 minutes

That mass air flow meter has to be dealership, no aftermarket mass air flow meters

also make sure that the front air fuel ratio sensor connectors have not been reversed from B1 S1 and B2 S1

Note: I've seen this code p0171 fixed many times with a factory OEM Mass Air Flow Meter, it has nothing to do with the code definition flagging bank 1

Edited by Administrator

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Hi guys wanted to give an update..The current thought path is that the air pump valves on the back of the head is sticking for bank 1.

 

These fuel trims are crazy with parameters ranging from -1.8 lt ft to 40.1 lt ft. bank 2 always stays constant at 3.0 lt ft  to 5.9 lt ft.

Going to remove intake and check valves for operation.will does this Saturday and return with results..

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An update for you guys following this post.Have received air diverter valves this morning and should have them installed by tomorrow.

After install and final test drive will report back with more info.

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Installed diverter valves and all was well for first thirty miles then fuel trim starting acting up again.Gonna go back and double check everything.Must have missed something.

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That mass air flow meter has to be dealership, no aftermarket mass air flow meters

 

I suggest you clear your fuel trims (adaptations) by unplugging the battery leads shorting them together and turning the ignition switch on for 10 minutes

also make sure that the front air fuel ratio sensor connectors have not been reversed from B1 S1 and B2 S1

Note: I've seen this code p0171 fixed many times with a factory OEM Mass Air Flow Meter, it has nothing to do with the code definition flagging bank 1 

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you will need to use a scope

for this

do you have a scope ? do you have inductive current probe ? 

 

with Coil on plug you can not get 2ndary spark waveforms   .....

ahh

yes you can   .... sorta kinda

 

you can see burn time

in the current waveform    after    the primary    ramp     anyway  this is moot if you do not have a scope   

 

so

do you ?

 

so once again i can not upload images   .....here

so look in the technical documents downloads area and

you can see a hi res capture of a good with a bad MAF sensor
IF the car has a restricted exhaust on one bank     then every other pulse will have reduced amplititude unlike this capture which shows gradual fading of amplitude as engine rpm returns to idle from WOT snap .
 
your system probaBly does not have an under reporting MAF sensor as only one bank is affected
how ever
there ARE other things to be tested which can not be tested with anything but a scope
 
but
you can use the knock retard PIDs per cylinder
to pick off a lean / restricted injector OR poor quality fuel , at WOT 
with low quality fuel even though everything in fuel trim is right the calculated load value at WOT may be low because the ignition timing is held back   to prevent ping   due to  heavy carbon deposits or low quality fuel 
 
if only one cylinder has heavy knock retard
find out why
Edited by Mike Webb
add image and spelling knock retard

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All right guys think i have this one headed in the right direction now.I was instructed by a friend to measure the voltage on my heater wire plus and my oxygen sensor pump wire for erratic values.Man did i find erratic values everything from 2.1 volts -----4.3 volts nominal voltage for both should be 3.3 on pump sensor wire and 3.0 on heater side...Much to my surprise there was a liquid substance leaking from the PCM.Going to open pcm and take some photosbefore i post as fixxed.Guys I thank everyone for the input as always.

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I thought that the A/F sensors were already replaced. and were "OE factory Nippondenso" sensors ?

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We all have been waiting since Oct 6 (your last post) did you get it fixed ?

PS - I thought that the A/F sensors were already replaced. and were "OE factory Nippondenso" sensors ?

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