Great diagnosis Cody! I would never thought about a steering sensor affecting fuel trims! One for the tools of diagnosis! Thanks for sharing it!! Awesome awesome!!
Thank you 🙏🏻 been chasing the problem for a while after doing a timing chain and cam replacement on a truck I got when my BIL passed. My wiring is good but switch was bad. I didn’t have all the readouts but the freeze frame data showed an 18% engine load at idle. Unplugged the switch and everything when to normal. The lock to lock steering trick was the clue I needed to fix it. Thanks so much.
Great diag Cody. Thanks for sharing, can’t say I would’ve looked at the PS pressure switch for a rich concern . Makes sense now as you say it’s more load on the engine. Learn something new everyday.
Cody excellant video. All of your videos are filled with so much useful information. Thanks for sharing. That 5V ref. Is so important on today's cars. Would of liked to see a wiring schematic to see what else it was sharing but anyway still an excellent informative video. Thanks Artie 👍👍👍
Nice Cody! Weird that higher than normal ps psi would cause the computer to fatten the pulse width. It should have also caused a higher than normal idle speed too, in which case it should not have been running rich. Any chance that ground circuit was affected too? Maybe the O2s could be effected by elevated voltage on the ground circuit of that ps psi sensor circuit? Or maybe the 5v ref was being pulled low? And no codes was also weird but we know someone was playing before you got there. I just don't understand the logic on the need for a fatter pulse width without also opening the throttle up a little more for the false load. Hope I'm making sense in my questions.
First off thanks for commenting Paul! Second your comments make complete sense. The rpm was elevated slightly very slightly, around 800 rpm which was nothing I could tell from sitting in the vehicle. I did notice that turning the wheel the rpm wasn’t changing, which it should raise to adjust for the additional load on to prevent the vehicle from stalling. I did notice that all three wires were bare and touching each other so I’m sure that ground, 5v, and signal wire all played a part. Also looking at the scan data looks like the circuit was getting pulled low from the ground circuit like you mentioned.
@@codysautodiagnosticsprogra8706 yeah it is weird the fuel trim strategy there and it was constant, not coinciding with the drop out to 0 psi but with the constant 300+ psi (I think that was your nominal psi). So I was wondering if it truly is some weird strategy and is related to something we would only see on a drive by wire? Maybe the old style IAC valve type and you don't have this issue because the system would have opened the IAC for sure. (giving you air to go with the fuel for a higher idle speed). Or, was there some bleed into the O2 circuit causing a false richer than normal signal. I would imagine if that was the case though that, that engine would have been idling really rough. Was it? If not, then we go back to the later strategy I mentioned. So that means the command was there for more fuel and to open the throttle but the throttle motor and desired idle logic conflicted with the increase fuel demand strategy and so we can blame shitty logic in the program :-)
ScannerDanner very good points there Paul. This vehicle wasn’t idling horrible. I would be assuming the same thing about maybe some default strategy by the pcm for this situation. I’ve tried to do some digging in SI but can’t come up with an more info on the power steering pressure switch cause and effect situations. App it talks about is adjusting idle control but nothing about fattening the mixture, so definitely could be bleed back into o2 sensor, like you mentioned. Wish I could go back and dig little deeper for these answers 🤦♂️
Here's the thing, if it was bleeding into the O2 circuit somehow, it would have been a false rich and the negative trim would have caused an actual lean condition and I think a rough idle. As apposed to an actual fatter pulse width baseline command that was trimmed back out to almost normal by the fuel trim. Hence the normal idle speed and only slightly elevated rpm. Not sure man.
Cuba's Automotive thank you Cuba! Wish I grabbed more pids to show rpm and injector pulse width as well. Doing these videos at work I try not to spend more time then I need to since I’m still tying to make money flat rate. Appreciate the command support so thank you
@@ScannerDanner right? We've got an amazing group of friends and technicians behind the scenes. I, for 1, feel so blessed and thankful to be a part of it. Hopefully all of us together, slowly raising the automotive repair industry. 😉😉😊😊
@@codysautodiagnosticsprogra8706 I totally get it, but you did hit the major points, which I think most of us grasped. Making videos is time consuming, and you being on the clock while making them doesn't help. I KNOW how difficult it is! I give you huge props for the quality content you're able to produce! 😉😊
hey cody thanks for showing the issue in detail....common problem on the fords....i'v seen about a dozen issues and most of the time the pressure is way up there....so much that the vehicle was towed in for unable to run....both short and long fuel trims are pegged....unplug the ps and runs great...thanks again for the vid.....ya know how many double takes of gotton for explaining the it was the ps switch....looking at me like I wasn't from this planet!!! ha ha ha ....good vid cody
Awesome video man.i did know that power steering pressure affected idle air control command percentage (or on a drive by wire)open the throttle plate a little more and that the ecm looks at it for load percentage but fuel trims being effected like that? ... amazing. I can definitely appreciate the fact that you took notice of turning the wheel causing your problem and following that instead of going down the wrong rabbit hole. Great job. I also liked how you mentioned the fact that just a pigtail would have fixed the problem.
It's crazy how ford's power steering pressure switches can cause so much trouble. Just saw a diagnosis video on a ford escape from South Main Auto. Where the power steering pressure switch was bad and the pcm was throwing an evap code!
This one was a good one. Didn’t realize how much control that switch has on fuel trims. I haven’t seen that video from Eric-0, I’ll have to go search for it
Thanks bro, I had no idea how much the pcm strategy would look at the power steering switch but apparently it seems to hold some weight. Wish I could find more info on pcm strategy on this situation.
I have been starting to use it more and lots of things I like about it. Have the small launch Diagun but screen is to small for me for diagnostics. Love the bigger version and think it’s an awesome tool. Like it much better then my autel
wow! man, i believe 80% of us will never think of the cause of rich on fuel trim. i wont b too suprise a faulty back light start to effect fuel trims 😅
Weird is the only word to describe this situation. Why would the computer take any notice of a pressure switch ??? Maybe 5v reference is being compromised. The circuit diagram needs to be examined.
Ps pressure switch is an input to the computer to adjust idle and injector pulse width so vehicle doesn’t stall while adding a load from steering. Hope this helps
I don't see how P.S. pressure would directly affect fuel trim either. Throttle/idle speed only. I too suspect a sensor ground or reference voltage problem due to the short.
Here viewing because of a shoutout by DIAGNOSEDAN!! Nice work, thanks for sharing!! I see Keith is here too, so this channel can't be bad at all!! Glad I found you!!
Right that’s how I felt seeing this. I was like WTF. Thing came back couple weeks later due to that power steering pressure switch pulling 5 volt ref low to 2.5 volts. The sensor was not OEM and was aftermarket but again fuel trims were negative 25 percent.
PRODIGY Cody 's Auto Diagnostics Sharing what you know with us great video. 👍 nice music 🎶 🎵 👌 👏 👍 Take care and have a great day Cody 's Auto Diagnostics From Nick Ayivor from London England UK 🇬🇧
That tool is bad ars great video, many would of run down the wrong path . Great job in discovering input related , from a component that would be unexpected . In a fuel trim diagnosis .
Awesome video! I don't have a Ford truck but just bought an Acura with 13,000 miles on it and my bank 1 ltft is around -2 to 0% and bank 2 is -6 to -1%. Is this any room for concern or normal readings?
Thanks I hope you just helped me solve my issue with a Lexus GX 460 with P1603-Stall : history, P 1605 , and a low/high circuit for steering wheel and ABS ; that’s rough idling, cycling LT fuel trim from positive to negative. When I turn the steering wheel the idle speed changes. Thank you.
Cody’s Auto Diagnostics but if you didn’t have your scan tool hooked up pulling it in it may have been a longer diag for sure! Goes to show you should always have that data streaming during a test drive. Even if it just into the bay. Nice find!
Thank you Cody. Good job. I'm not understanding how the power steering pressure switch is being used by the PCM to adjust fuel trims, since the main input for determining fuel air are the oxygen sensors.
Hi Billy, the computer uses the power steering pressure switch to adjust the idle up once it sees a pressure rise, so the additional load won’t stall out the vehicle. Since this is showing high psi it was adjusting the injector pulse width to compensate for the load (that it didn’t have)
Great video Cody. That puts things into perspective. When you were turning the wheel and the FT's were changing all I could think was WTF. But looking at the big picture the question is, what inputs will affect the engine performance like that? Feeling bummed for the cameraman though. Couldn't you just have sent to some training to improve his skills?
This comment made me laugh 😆 about the cameraman, so thanks for that buddy. The pressure switch is used as an input to adjust the idle and pulse width of the injectors for the additional load on the vehicle. When there was no load on this vehicle but a pressure of 300 psi the injectors were staying open longer.
What should i look at? Fiesta 1.6 ecoboost 200hp. Got -13 to - 16 ltft only at idle, as soon i hit the throttle it jumps to -5/-3, at wot is -3%, but when i release the throttle it goes down again. The car runs good, no hesitatuons and pulls strong..just a bit of rough exhaust sound at idle, and sometimes when i start the car when it is warm rpm go down for a moment then up to 750 rpm and stay steady. No error codes, no misfire in any conditions, o2 sensors working good, no visible leaks anywhere..
Awesome video Cody, was I reading that correctly 300,000 miles on that truck? You guys are lucky we never see mileage like that lol if we do we don’t want to work on it because it’s a rust bucket 🤣 I’m jealous.... nice fix as well that was interesting
I have a rich fuel trim @ Idle but PSI didn't seem to impact the numbers, MAF number is around 5 @ Idle, TP is 13% @ Idle sounds suspicious. Kind of stuck, don't know where to go from here
Seemingly thats a hard fault so regardless if codes where cleared why didn't it return immediately with just koeo?? Or is it one those consecutive drive cycle type fault????
You would think that it should have been a hard fault and come right back but it didn’t. I’m pretty sure if I would have done the KOEO or KOER test, a great possibility a power steering sensor code would have popped up. I didn’t perform this function and only performed a pre scan of all the modules.
Hi I think I have same problem my short term fuel trims change when I move my steering wheel. Would you be able to tell me if I have the same switch it's a 2011 KIA optima SX 2.0t?? Thank you
Hi I'm having same issue with negative fuel trims that get better with a/c on but don't have a obd code, could it be this switch??and would a 2011 Kia optima have one?
dammmm my power steering connector is broken and disconnected, let me go check if this is why i have negative trims... been disconnected for a very long time
Wow excellent video. I wouldn't have thought of that. At first I was like heuh is he drunk or something 😁 Makes sense now. I'll definitely keep this in mind. Thanks Cody! 👍
Excellent job bud :) I came here because my 2013 2.0L n/a lancer (manual trans) is reading short and long term -11 any ideas where I could start? It has electric power steering not hydraulic. If it helps its throwing o2 sensor codes occasionally so it could be that
Heyy Cody my honda pilot short fuel trim bank1 is -27.3% and starts at 0% But Long term bank 1 start at -13.3% and won't change and this is at idle..Didn't check other way. Any advice on this please. By the way those 3 cylinders on bank one are dead and the 4 elements are there well the pcm is taking fuel away i know cus short term -27.3%. Can you tell me my problem??? No check engine light neither🙈
Thank you so much , fixed the issue on my mazdaspeed3 , wich is a fomoco engine also, do you think its possible that this was also my issue for why my Maf voltage and airflow werent matching what they should in the tune ? Cuz my voltage and lbs/min were way off from the tune before , i didnt get a chance to see if its also fixed
Hmm that’s a good question. I would want to see the numbers afterwards and verify it f this indeed fixed both issues. I can’t tell you for sure if it would since this was a “first” for me on this vehicle
My LTFT STFT are - 17... MAF 2.6 on idle and with ac on idle 3.5.. egr error 99.2 sometimes egr fluctuating even negative error... O2 sensor 1 no reading sensor 2 reading is .1 to .9... air fuel ratio commanded and measured fluctuating...
Mohsin Rehman you will want to force the o2 sensor rich then force it lean to see if it will go above .8 mv and below .2 mv. If it doesn’t then the o2 sensor is bad
Why couldn't you do a fuel pressure test first just to make sure that this is what the cause of it is so then the other person who cannot read this information would make sense of them mine turned out my negative fuel trim turned out to be a fuel pump pressure so I have replaced it and now I get a good reading
Isreal Perez why do that when I could watch fuel pressure on the fuel pressure sensor instead. Also if I’m not seeing something stand out on the pressure sensor then I need to focus on something else.
@@codysautodiagnosticsprogra8706 you know what it is is that there's a lot of forms out there on RUclips that talks about fuel trim but none of them talk about how to actually read it so my problem was I couldn't understand how to read it so then what I ended up doing was a fuel pressure test my BMW is supposed to have 50 psi and lot of forms talk about all vacuum leak this and that so I ended up just checking it for myself and I had 45 PSI and it was going down to 20 and a half hour so I rolled out everything else that I ended up having a vacuum leak and then I replace my fuel pump now I'm on now I'm on day 2 without a lean condition and no one can actually tell me exactly how to read or to understand in basic terms
Isreal Perez your absolutely right and honestly since these were rich codes I wasn’t focused on the pump. I see pumps lose pressure but I haven’t ever seen them build more pressure so that’s why I didn’t focus more on fuel issue. Even if fuel pressure is high the pcm would command fuel injectors closed longer to make up the difference. Could have definitely checked it for video purposes though
@@codysautodiagnosticsprogra8706 I do have a question for you though I don't think it's based on lean conditions do you know anything about a P0 604 I own a 2004 BMW and that's the only code that I have left it takes two days for it to class backup I did a are trying to figure it out my lean condition and turned out that my fuel pressure was too low so that's why I replace my fuel pump but now every two days I would have this code above the P0 604 now I do like your video it was really great
4 года назад
1:17 is a ECU take away do to GO LEAN command , it receiving rich condition
Cody’s Auto Diagnostics hi thanks for the quick response i do get a reading for stft b1 s1 and stft b2 s1 so i believe my scanner is working I believe this is causing me to have a fail emissions test but i have no check engine light hope you can help thanks
Cody’s Auto Diagnostics i just checked with my scanner usually if its green it passes its yellow so it probably won’t but i taught it was weird that a n/a reading is showing for the stft b1 s2
Hahaha! Fired your cameraman?? I know a fellow named Caleb, that does a pretty good job as CAMERAMAN!! He makes SCANNERDANNER look pretty smart, all of the time!! Lol
I wish I had a Caleb to help me film. Paul’s videos are incredible now, they have always been good but Caleb’s touches are definitely an added perk though!
I reckon that it would take a lot of cash, to drag him away!! Or a pretty girl!! Fortunately, I don't have either one, darn my luck!! I guess you get to keep him!!
I would never have believed that the power steering switch would cause fuel trims to go rich that was great diagnostic work, thanks for the info
I honestly didn’t realize how much the power steering switch has on fuel trims tell i saw it on this vehicle
Great diagnosis Cody! I would never thought about a steering sensor affecting fuel trims! One for the tools of diagnosis! Thanks for sharing it!! Awesome awesome!!
Maic Salazar Diagnostics right! I never realized how much those switches effect the pcm control so it was good for me as well
Maic!
ScannerDanner how are you my good friend!! This case was very interesting!!
ScannerDanner awesome to see you here too!!
Thank you 🙏🏻 been chasing the problem for a while after doing a timing chain and cam replacement on a truck I got when my BIL passed. My wiring is good but switch was bad. I didn’t have all the readouts but the freeze frame data showed an 18% engine load at idle. Unplugged the switch and everything when to normal. The lock to lock steering trick was the clue I needed to fix it. Thanks so much.
Awesome stuff Cody. And brilliant editing 👍👍. Maybe one day I'll get all fancy pants too 😄
Keith your videos and diagnostics don’t need all the bells and whistles 😂 mine do unfortunately lol. Always appreciate you stopping by buddy!
And Keith is here too!
Keith is always sneaking around somewhere.
DIY Misfit "Mechanic" your couldn’t be more right 😂
No need to get fancy pants, we never see your pants in your videos anyway.
Great diag Cody. Thanks for sharing, can’t say I would’ve looked at the PS pressure switch for a rich concern . Makes sense now as you say it’s more load on the engine. Learn something new everyday.
I honestly wouldn’t have said that a couple weeks ago. I had no idea what kind of control the pa switch has for the pcm tell this.
Wow. Power steering sensor affected fuel trims so much. Great video. Very informative....
I was surprised seeing this as well
Cody excellant video. All of your videos are filled with so much useful information. Thanks for sharing. That 5V ref. Is so important on today's cars. Would of liked to see a wiring schematic to see what else it was sharing but anyway still an excellent informative video. Thanks Artie 👍👍👍
Thanks Artie, yes I totally spaced the wiring diagram and need to include that next time. Thanks for the tip buddy👍
Arthur!
Nice Cody! Weird that higher than normal ps psi would cause the computer to fatten the pulse width. It should have also caused a higher than normal idle speed too, in which case it should not have been running rich. Any chance that ground circuit was affected too? Maybe the O2s could be effected by elevated voltage on the ground circuit of that ps psi sensor circuit? Or maybe the 5v ref was being pulled low? And no codes was also weird but we know someone was playing before you got there.
I just don't understand the logic on the need for a fatter pulse width without also opening the throttle up a little more for the false load. Hope I'm making sense in my questions.
First off thanks for commenting Paul! Second your comments make complete sense. The rpm was elevated slightly very slightly, around 800 rpm which was nothing I could tell from sitting in the vehicle. I did notice that turning the wheel the rpm wasn’t changing, which it should raise to adjust for the additional load on to prevent the vehicle from stalling. I did notice that all three wires were bare and touching each other so I’m sure that ground, 5v, and signal wire all played a part. Also looking at the scan data looks like the circuit was getting pulled low from the ground circuit like you mentioned.
@@codysautodiagnosticsprogra8706 yeah it is weird the fuel trim strategy there and it was constant, not coinciding with the drop out to 0 psi but with the constant 300+ psi (I think that was your nominal psi). So I was wondering if it truly is some weird strategy and is related to something we would only see on a drive by wire? Maybe the old style IAC valve type and you don't have this issue because the system would have opened the IAC for sure. (giving you air to go with the fuel for a higher idle speed). Or, was there some bleed into the O2 circuit causing a false richer than normal signal. I would imagine if that was the case though that, that engine would have been idling really rough. Was it? If not, then we go back to the later strategy I mentioned. So that means the command was there for more fuel and to open the throttle but the throttle motor and desired idle logic conflicted with the increase fuel demand strategy and so we can blame shitty logic in the program :-)
ScannerDanner very good points there Paul. This vehicle wasn’t idling horrible.
I would be assuming the same thing about maybe some default strategy by the pcm for this situation. I’ve tried to do some digging in SI but can’t come up with an more info on the power steering pressure switch cause and effect situations. App it talks about is adjusting idle control but nothing about fattening the mixture, so definitely could be bleed back into o2 sensor, like you mentioned. Wish I could go back and dig little deeper for these answers 🤦♂️
Here's the thing, if it was bleeding into the O2 circuit somehow, it would have been a false rich and the negative trim would have caused an actual lean condition and I think a rough idle. As apposed to an actual fatter pulse width baseline command that was trimmed back out to almost normal by the fuel trim. Hence the normal idle speed and only slightly elevated rpm. Not sure man.
ScannerDanner you got me thinking, try and do some more digging on this and see if I come up with anything. I’ll keep you posted
Keeping it simple. Following the clues and not jumping the gun. Awesome process! Cool editing too. 😉😊
Cuba's Automotive thank you Cuba! Wish I grabbed more pids to show rpm and injector pulse width as well. Doing these videos at work I try not to spend more time then I need to since I’m still tying to make money flat rate. Appreciate the command support so thank you
Holy crap, everyone is here, awesome
@@ScannerDanner right? We've got an amazing group of friends and technicians behind the scenes. I, for 1, feel so blessed and thankful to be a part of it. Hopefully all of us together, slowly raising the automotive repair industry. 😉😉😊😊
@@codysautodiagnosticsprogra8706 I totally get it, but you did hit the major points, which I think most of us grasped. Making videos is time consuming, and you being on the clock while making them doesn't help. I KNOW how difficult it is! I give you huge props for the quality content you're able to produce! 😉😊
Yes!
hey cody thanks for showing the issue in detail....common problem on the fords....i'v seen about a dozen issues and most of the time the pressure is way up there....so much that the vehicle was towed in for unable to run....both short and long fuel trims are pegged....unplug the ps and runs great...thanks again for the vid.....ya know how many double takes of gotton for explaining the it was the ps switch....looking at me like I wasn't from this planet!!! ha ha ha ....good vid cody
um .... common up here in the northeast
Thanks buddy, like hearing other guys experience with this issue as well. Thanks for your comments
Awesome video man.i did know that power steering pressure affected idle air control command percentage (or on a drive by wire)open the throttle plate a little more and that the ecm looks at it for load percentage but fuel trims being effected like that? ... amazing. I can definitely appreciate the fact that you took notice of turning the wheel causing your problem and following that instead of going down the wrong rabbit hole. Great job. I also liked how you mentioned the fact that just a pigtail would have fixed the problem.
It's crazy how ford's power steering pressure switches can cause so much trouble. Just saw a diagnosis video on a ford escape from South Main Auto. Where the power steering pressure switch was bad and the pcm was throwing an evap code!
This one was a good one. Didn’t realize how much control that switch has on fuel trims. I haven’t seen that video from Eric-0, I’ll have to go search for it
@@codysautodiagnosticsprogra8706 ruclips.net/video/vp7g5sSzkh0/видео.html
I think it is a 3 part video. It's very interesting.
Nice find. Makes sense, pressure sensor making the pcm think there's a load and it adjust fuel trims as necessary. Except it was a false reading.
Thanks bro, I had no idea how much the pcm strategy would look at the power steering switch but apparently it seems to hold some weight. Wish I could find more info on pcm strategy on this situation.
Noticed you using the maximus 3.0 in a couple of recent videos. I've used mine for about a year now. Really a great scan tool in my opinion
I have been starting to use it more and lots of things I like about it. Have the small launch Diagun but screen is to small for me for diagnostics. Love the bigger version and think it’s an awesome tool. Like it much better then my autel
Enjoy the videos. Keep up the good work.
I learned something new, cody thank you
That’s what matters! Thanks buddy
wow! man, i believe 80% of us will never think of the cause of rich on fuel trim. i wont b too suprise a faulty back light start to effect fuel trims 😅
Weird is the only word to describe this situation. Why would the computer take any notice of a pressure switch ??? Maybe 5v reference is being compromised. The circuit diagram needs to be examined.
Ps pressure switch is an input to the computer to adjust idle and injector pulse width so vehicle doesn’t stall while adding a load from steering. Hope this helps
I agree with this assessment, combined with stupid logic within the idle control system :-)
I don't see how P.S. pressure would directly affect fuel trim either. Throttle/idle speed only. I too suspect a sensor ground or reference voltage problem due to the short.
Here viewing because of a shoutout by DIAGNOSEDAN!!
Nice work, thanks for sharing!! I see Keith is here too, so this channel can't be bad at all!! Glad I found you!!
That’s awesome! Thanks for stopping by buddy!
You're not welcome here roadkill lol just kidding buddy
ScannerDanner 😂😂😂
Lol Scan!! You don't mind if I call you Scan, do you?? You can call me Road!! ;-P
Ah nice one! For 10minutes im going like, what does this guy want with fuel trims and powersteering pressure data....? Thnx for the info m8!!
Right that’s how I felt seeing this. I was like WTF. Thing came back couple weeks later due to that power steering pressure switch pulling 5 volt ref low to 2.5 volts. The sensor was not OEM and was aftermarket but again fuel trims were negative 25 percent.
Awesome video! Keep em' coming!
Thank you bro!
PRODIGY Cody 's Auto Diagnostics
Sharing what you know with us great video. 👍 nice music 🎶 🎵 👌 👏 👍
Take care and have a great day Cody 's Auto Diagnostics
From Nick Ayivor from London England UK 🇬🇧
Well, my 03 Lariat 5.4 has a rough idle and the trims are negative...I never would have guessed to look there. I know where I will look now!
Well thats fantastic... thank you sir. I have an issue im chasing as well. Sometimes we need to just be open to all possibilities... well done sir
Thank you! I had no idea how much power steering plays on the pcm fuel control Strategy
That tool is bad ars great video, many would of run down the wrong path . Great job in discovering input related , from a component that would be unexpected . In a fuel trim diagnosis .
Thank you Doug! I guess I’ve never paid attention to how much control the ps switch has in for fuel trim control tell seeing this.
Awesome video! I don't have a Ford truck but just bought an Acura with 13,000 miles on it and my bank 1 ltft is around -2 to 0% and bank 2 is -6 to -1%. Is this any room for concern or normal readings?
unbelievable. Been fighting negative ltfts for too long. Now to check other causes.
Wow..Crazy strategy going on there.. Great find Bro. Definitely will keep this one in mind. Thanks for sharing this one. Cheers
Cheers brotha!! I’m hung over lol
Thanks I hope you just helped me solve my issue with a Lexus GX 460 with P1603-Stall : history, P 1605 , and a low/high circuit for steering wheel and ABS ; that’s rough idling, cycling LT fuel trim from positive to negative.
When I turn the steering wheel the idle speed changes.
Thank you.
no fricken way. how in the world did you diagnose this without a hope and a prayer
tracycolorado I got lucky bro. Pulling vehicle into the shop I noticed fuel trims changing while Turning the wheels
Cody’s Auto Diagnostics but if you didn’t have your scan tool hooked up pulling it in it may have been a longer diag for sure! Goes to show you should always have that data streaming during a test drive. Even if it just into the bay. Nice find!
Martin Bonoan very true!
Eril Oand Ivan from Pine Hollow had a video same exact thing. Power steering sensor effecting fuel trims. Who would have thunk! LOL
Lol it’s funny how that works. I need to go find that one from Ivan, since I haven’t seen it yet. Thanks buddy
@@codysautodiagnosticsprogra8706 If I remember right. Erik and Ivan did the video together.
Nice find Cody
Thank you Mike
Mike!
@@ScannerDanner 😉
what scanner are you using here?
I’m using the Matco Maximus 3.0 here buddy
I liked the way it was laid out. Clean
Great video. Definitely an interesting one. Thanks for sharing.
Thanks for watching buddy
Can’t wait to catch that issue one day thx to you. Great video Cody 👍🏻
Oh and the background music was cool .. it was like watching a LiziQi video... and that chic is freakin awesome.
Oh good I’m happy you liked it! Always trying new things and like to hear feedback of things are working or they are not, so thanks for that
Your videos are great bro so is that pulse sensor I got from ya 👍🏻 take a break bro and Labor to you family 🍻🤙🏼
Thank you Cody. Good job. I'm not understanding how the power steering pressure switch is being used by the PCM to adjust fuel trims, since the main input for determining fuel air are the oxygen sensors.
Hi Billy, the computer uses the power steering pressure switch to adjust the idle up once it sees a pressure rise, so the additional load won’t stall out the vehicle. Since this is showing high psi it was adjusting the injector pulse width to compensate for the load (that it didn’t have)
@@codysautodiagnosticsprogra8706 if its adjusting for the load it doenst have why isn't the idle higher than normal? thanks
Awesome stuff...here courtesy of SD and diagnose dan....now subscribed.
Welcome to the channel!! Scannerdanner and diagnose Dan are amazing channels!
Great video Cody. That puts things into perspective. When you were turning the wheel and the FT's were changing all I could think was WTF. But looking at the big picture the question is, what inputs will affect the engine performance like that? Feeling bummed for the cameraman though. Couldn't you just have sent to some training to improve his skills?
This comment made me laugh 😆 about the cameraman, so thanks for that buddy. The pressure switch is used as an input to adjust the idle and pulse width of the injectors for the additional load on the vehicle. When there was no load on this vehicle but a pressure of 300 psi the injectors were staying open longer.
Kirk!
@@ScannerDanner Yep. Sometimes the lightbulb flickers lol.
Great use of the graphing and explanation of the issue!!
Thank you! I like graphing as much as I can. Seeing an issue or graph over time helps me see more of what is going on imo
Nice diagnosis & repair Cody!
Thank you sir!
Does this apply to a 2001 Ford Mustang 3.8L V6? Or are those more simple. Mine is currently running rich on both banks.
If it has a power steering pressure switch (which it most likely does) then I would check this
did you ever find out ? i have a 3.9 mustang with high negative fuel trims and was curious what ur outcome was
What should i look at?
Fiesta 1.6 ecoboost 200hp.
Got -13 to - 16 ltft only at idle, as soon i hit the throttle it jumps to -5/-3, at wot is -3%, but when i release the throttle it goes down again.
The car runs good, no hesitatuons and pulls strong..just a bit of rough exhaust sound at idle, and sometimes when i start the car when it is warm rpm go down for a moment then up to 750 rpm and stay steady.
No error codes, no misfire in any conditions, o2 sensors working good, no visible leaks anywhere..
by chance is the air conditioning sharing some of that circuit?? its thinking high p/s and a/c pressures ?? good find
I’ll have to look at a wiring diagram for this buddy, I’ll get back to you
Great video Cody! Nice catch!
Thanks Joe
Awesome video Cody, was I reading that correctly 300,000 miles on that truck? You guys are lucky we never see mileage like that lol if we do we don’t want to work on it because it’s a rust bucket 🤣 I’m jealous.... nice fix as well that was interesting
Yeah 300k 😂 we get a lot of those cars with miles like that. I couldn’t deal with true rust daily
I have a rich fuel trim @ Idle but PSI didn't seem to impact the numbers, MAF number is around 5 @ Idle,
TP is 13% @ Idle sounds suspicious. Kind of stuck, don't know where to go from here
This was awesome Cody..Thanks for Tip
Second time I see a ps switch on a Ford cause something unrelated to what we are chasing.
guayaco3299 right! Never realized how much effect this had on fuel control
Seemingly thats a hard fault so regardless if codes where cleared why didn't it return immediately with just koeo?? Or is it one those consecutive drive cycle type fault????
You would think that it should have been a hard fault and come right back but it didn’t. I’m pretty sure if I would have done the KOEO or KOER test, a great possibility a power steering sensor code would have popped up. I didn’t perform this function and only performed a pre scan of all the modules.
Hi I think I have same problem my short term fuel trims change when I move my steering wheel. Would you be able to tell me if I have the same switch it's a 2011 KIA optima SX 2.0t?? Thank you
excellent job Cody
Hi I'm having same issue with negative fuel trims that get better with a/c on but don't have a obd code, could it be this switch??and would a 2011 Kia optima have one?
dammmm my power steering connector is broken and disconnected, let me go check if this is why i have negative trims... been disconnected for a very long time
Wow excellent video. I wouldn't have thought of that. At first I was like heuh is he drunk or something 😁 Makes sense now. I'll definitely keep this in mind. Thanks Cody! 👍
😂😂😂 if I wasn’t at work then you could have totally nailed that I was drunk 😂
Haha 😂😂
Dylan!
While you're here I'm watching SD Premium Paul 😂
You are awesome Dylan and thanks for continuing to help me out on the forum.
Thanks bro for the excellent information…
Thanks for watching!
Thanks brother
What scan tool is that bro
Had you heard about the power steering pressure switch doing this to the fuel trims? I would have never thought to turn the wheel. Wow!
Okie-Tom i had no idea the effect the switch has on engine load signals to pcm. I was amazed as well lol
Very cool!!
Excellent job bud :) I came here because my 2013 2.0L n/a lancer (manual trans) is reading short and long term -11 any ideas where I could start? It has electric power steering not hydraulic. If it helps its throwing o2 sensor codes occasionally so it could be that
Why lftf didnt compensate when the stft is going negatif? I was thinking lftf will compensate immediately, am i right?..
Short term changes and long term is the learned value over time.
so how exactly does the switch do anything with fuel trim?? also did you get lucky and notice turning the wheel it leaned out?? then went from there
Pcm watches power steering switch to adjust idle rpm and injector pulse width to compensate for the load on the vehicle
Also I noticed the fuel trims while pulling into the shop and turning the wheel fyi
@@codysautodiagnosticsprogra8706 good lucky find but good diagnosis seriously
Sometimes it points you ina direction quickly and sometimes it doesn’t lol. Thanks for the comments buddy
Phil!
Heyy Cody my honda pilot short fuel trim bank1 is -27.3% and starts at 0%
But Long term bank 1 start at -13.3% and won't change and this is at idle..Didn't check other way.
Any advice on this please.
By the way those 3 cylinders on bank one are dead and the 4 elements are there well the pcm is taking fuel away i know cus short term -27.3%.
Can you tell me my problem???
No check engine light neither🙈
What’s the fuel trim on the other bank?
Good video good information thank you for your time.
Thank you and thanks for watching!
Sorry for blowing up your phone, just saying hello to our mutual friends
ScannerDanner Paul you are welcome here anytime and whole reason I started a channel was due to your inspiration!! That’s for everything Paul!
Thanks
Nice ! Who would think !
Thank you so much , fixed the issue on my mazdaspeed3 , wich is a fomoco engine also, do you think its possible that this was also my issue for why my Maf voltage and airflow werent matching what they should in the tune ? Cuz my voltage and lbs/min were way off from the tune before , i didnt get a chance to see if its also fixed
Hmm that’s a good question. I would want to see the numbers afterwards and verify it f this indeed fixed both issues. I can’t tell you for sure if it would since this was a “first” for me on this vehicle
@@codysautodiagnosticsprogra8706 ill get back to you cuz ill be logging soon haha
Sounds good
That's crazy lol good video
How about in case long term fuel trim negative? any advice in possibility ?
Is long term negative at idle or at cruise?
@@codysautodiagnosticsprogra8706 both, always negative some time -10.2% some time 7.0% keep and not change.
nice find buddy
Can you help me with stft bank 1 shows - 100 and bank 2 is at 0 what would cause this E46 325xi bmw am using torque app that shows me my fuel trim
What are your long-term fuel trims? Is this at idle or under cruise?
@@codysautodiagnosticsprogra8706 idle ltft 8.59 bank 1
From those numbers sounds like you have a vacuum leak somewhere
@@codysautodiagnosticsprogra8706 can a bad disa cause this I have p1093 and 5 bmw codes one of those code is a disa valve
They just came in for the free warranty repairs & drivability issue
No leaks found lol
Can’t fix feelings only vehicles
😂 I like that one!
My LTFT STFT are - 17... MAF 2.6 on idle and with ac on idle 3.5.. egr error 99.2 sometimes egr fluctuating even negative error... O2 sensor 1 no reading sensor 2 reading is .1 to .9... air fuel ratio commanded and measured fluctuating...
What size engine is this you are referring to and also can you command the front o2 sensor rich to see if can go above .8mv?
@@codysautodiagnosticsprogra8706 my car is honda civic 2012 1.8 L
@@codysautodiagnosticsprogra8706 using torque pro but not getting the reading of o2 sensor 1... for sensor 2 its .6 around
Mohsin Rehman you will want to force the o2 sensor rich then force it lean to see if it will go above .8 mv and below .2 mv. If it doesn’t then the o2 sensor is bad
@@codysautodiagnosticsprogra8706 how can i do it
Why couldn't you do a fuel pressure test first just to make sure that this is what the cause of it is so then the other person who cannot read this information would make sense of them mine turned out my negative fuel trim turned out to be a fuel pump pressure so I have replaced it and now I get a good reading
Isreal Perez why do that when I could watch fuel pressure on the fuel pressure sensor instead. Also if I’m not seeing something stand out on the pressure sensor then I need to focus on something else.
@@codysautodiagnosticsprogra8706 you know what it is is that there's a lot of forms out there on RUclips that talks about fuel trim but none of them talk about how to actually read it so my problem was I couldn't understand how to read it so then what I ended up doing was a fuel pressure test my BMW is supposed to have 50 psi and lot of forms talk about all vacuum leak this and that so I ended up just checking it for myself and I had 45 PSI and it was going down to 20 and a half hour so I rolled out everything else that I ended up having a vacuum leak and then I replace my fuel pump now I'm on now I'm on day 2 without a lean condition and no one can actually tell me exactly how to read or to understand in basic terms
Isreal Perez your absolutely right and honestly since these were rich codes I wasn’t focused on the pump. I see pumps lose pressure but I haven’t ever seen them build more pressure so that’s why I didn’t focus more on fuel issue. Even if fuel pressure is high the pcm would command fuel injectors closed longer to make up the difference. Could have definitely checked it for video purposes though
@@codysautodiagnosticsprogra8706 I do have a question for you though I don't think it's based on lean conditions do you know anything about a P0 604 I own a 2004 BMW and that's the only code that I have left it takes two days for it to class backup I did a are trying to figure it out my lean condition and turned out that my fuel pressure was too low so that's why I replace my fuel pump but now every two days I would have this code above the P0 604 now I do like your video it was really great
1:17 is a ECU take away do to GO LEAN command , it receiving rich condition
Computer is seeing a rich condition and trying to take fuel away. Positive numbers means it’s a lean condition and computer is adding fuel.
Paul !
👍👍
Power steering fluid is nasty stuff when it gets on wires or paint!
Absolutely it is! I’ve seen it eat paint similar to brake fluid.
Who would have taught a power steering pressure switch would cause - fuel trims.nice
Right!!
wow that a suprise.thank
😄
300,000 miles nice
Right lol
😂Poor cameraman
Great find brother 👍👍
Haha he wants unemployment now 😂
Mario is here too!
ScannerDanner I watch a LOT of RUclips :)
It was my first time Mario and he fired me after a few camera shakes! Pffff he’s a hard boss to please 🤣
hi does anyone know what it means if i have a stft b1 s2 (%) NA and a stft b2 s2 (%) NA ? Hope someone can clarify this for me thanks.
Means your scan tool isn’t reading the fuel trims. What tool are you using?
Cody’s Auto Diagnostics hi thanks for the quick response i do get a reading for stft b1 s1 and stft b2 s1 so i believe my scanner is working I believe this is causing me to have a fail emissions test but i have no check engine light hope you can help thanks
my live data show activity on the 02 sensors on all 4 i changed the 2 downstream o2 sensors and i taught that would solve my NA reading
mase202 there is no codes in the system? When you went threw emissions what did it say it failed for?
Cody’s Auto Diagnostics i just checked with my scanner usually if its green it passes its yellow so it probably won’t but i taught it was weird that a n/a reading is showing for the stft b1 s2
that means its a ford
Hahaha! Fired your cameraman?? I know a fellow named Caleb, that does a pretty good job as CAMERAMAN!! He makes SCANNERDANNER look pretty smart, all of the time!! Lol
I wish I had a Caleb to help me film. Paul’s videos are incredible now, they have always been good but Caleb’s touches are definitely an added perk though!
You can't have him! Haha but I'll tell him what you guys said.
I reckon that it would take a lot of cash, to drag him away!! Or a pretty girl!! Fortunately, I don't have either one, darn my luck!! I guess you get to keep him!!
It's a ford what else can be said
😂😂