Without reading all though this thread, was it determined that this car's PCM was reprogrammed for the false flagging VVT DTCs?(TSB S303-09)

 

So far, the main thing I've learned here is to take aspirin BEFORE reading your posts. It's going to get a headache anyway, but it helps to have the aspirin working ahead of time.

I will rephrase the question in very simple terms: With LIVE data showing, but the engine not running, are you seeing anything other than zero for the MAF sensor? It sounds like that is what you are saying, but I could really use an interpreter. This is a very basic yes/no question. If the MAF sensor value does not show zero under those circumstances, THAT IS A HUGE PROBLEM!!!! Fix it! Don't waste your time chasing other stuff until this glaring problem is corrected. Even if it shows zero some of the time, that's not good enough. This ain't Sex Panther cologne. The value need to be correct 100% of the time.

If that is not what you are saying, I'm sorry dude, but you've got to step up your communication game. Now I rarely call anybody dude, except for a brief phase after seeing The Big Lebowski, but I think it's warranted here. We keep asking questions, and get less than clear answers most of the time. Feels like I'm banging my head against a brick wall.


What exactly does this mean? Take your time, please explain in detail. I have no idea if this is a helpful clue, or just data overload for us.


Once again, more details, please. Does your scanner show VVT position command and feedback? If it only shows the position (feedback), we'd have no way of knowing what's the normal VVT position for any given scenario. Or are you seeing a split in feedback between the two sides?


"Reinstalling" is an interesting word choice. It would imply the O2 sensors are not currently installed or are perhaps disconnected.

If I have interpreted this correctly, could one of you guys do me a favor? I'll be standing on the sidewalk in front of my house. Could somebody please drive by at a high rate of speed and clock me hard in the head with a baseball bat? That's not too big of a favor to ask, is it? Just lean out your window and I'll hold still. Should be a piece of cake. PM me for the address, and we can work out a convenient time for both of us. Thanks.

 

Well , I apologize for my somewhat poor English composition skills 😔
so I’m working on it and listening to Dale Carnegie books on Audible ▶️
strongly recommend
⚙️


Positive , that reading is often something other than zero 🛠

and what I meant by mentioning that it seems aligned , is that the MAF Sensor reading is below 1 on idle and 1.7 at 1500 throttle etc , while the LTF is frequently balanced around zero

and since the clogged VVTs were giving me -50s reading , every time there’s negative numbers , I tend to think that it’s the VVTs , and most of the time pressing hard on gas rinses it to normal

and I tried cleaning those upstream O2 sensors , while the trim was -50 , thou they were seemingly quick to get dirty again with all that rich and expensive fuel
🦧


$$$
⛽️
Upstream O2s
MAF
New oil & filter

 

🦬

 

What a coincidence! Great author. I've been reading one of his lesser known books:

 

I note the above volume also has a heartfelt dedication to all the poor fools that bought cheap, no-name, Chinese MAFs on eBay and suffered the consequences...

 

Alright , so it’s been over 1500 miles since I rinsed the VVT and loaded the load viscosity oil along with a quart of ATF , and it’s clear that the VT got clogged again due to the crazy - 40 trims and the car stalling … should I flush it and get the high viscosity oil already of should I add another quart of ATF and wait till it’s unclogged again ???

 

Is the PCM reconfigured for the FALSE FLAGGING VVT DTC??????????????????????????????????????????????? ??

If not I'M OUT!!!!!!!!!!!!!!!!!!!!! no point in continuing the discussion!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

 

🤔

 

So this time I only need an answer to this specific question
(VVTs got clogged again)

 

🤔
Oh , and I’m also getting a genuine MAF sensor

 

If you'd please stand outside in a clearing, I will attempt to read your mind. It's not my strongest suit, but I'll give it a try. Not quite sure which "specific question" you are referencing, but hold on, I'm picking up your aura. Can you remove your tin foil hat? That will help. Thanks, I'm getting a faint reading now. Something about the PCM reflash for false VVT codes and also you're thinking of getting Chicken McNuggets for lunch. Did I get it right?

If you were indeed asking about the PCM reflash, go way back to post #3 in this never-ending thread. Open the attached PDF and read the details. If your car's PCM has already been reflashed, two identifying placards will have been installed at the time. One is in the trunk, on the aft wall of the spare tire well. The second is on the B-pillar, below the striker plate for the driver's door. If you don't have those placards, your PCM has not been reflashed unless somebody was lazy and didn't install them, which is not very likely.

Will you be charged for this reflash? Probably, but I don't know. You might be able to show the bulletin to the dealer and plead your case, but who knows how they will respond.

Now, in the kindest, gentlest manner possible, I'd like to get across that you are getting some excellent advice on how to proceed. Some of the guys here are former Jaguar specialists, and know what they're talking about. You've also got me, but I don't charge anything so at least you're getting your money's worth. Now none of us can be 100% positive on what to try next, but that's part of the game. Your car is patiently telling you some very detailed diagnostic information about how to fix things. I'm beyond ready to throw in the towel, as we keep suggesting things yet you seem to be waiting for the car to magically cure itself. We are not withholding information about the secret "Fix Everything" reset button behind the glove box. We are not suggesting you throw thousands of dollars at the car. Through the collective efforts of the forum, we are suggesting some reasonable (and not overly expensive) actions to try next, but no response. The only thing I see is hoping for a free Hail Mary to work and magically fix things.

What to try first? Personally, I'm leaning towards the MAF sensor. But maybe the PCM reflash is required, as previously suggested. That's been suggested by somebody with far more Jaguar-specific experience that I have. Which is a better option? We can't answer that for you, so you will have to decide. Maybe you need both. Obviously it's free to check for the placards, but after that, you may actually have to spend some money. I don't know your financial situation, but parts aren't free on any car. A $100 gamble on a quality MAF sensor sounds like good odds in my book. Same with paying to have the PCM reflashed, if needed. Neither expense is over the top, and very reasonable for a 20 year old car. You've got to face it, that it's probably time to break out your wallet versus hoping the problem will go away on its own for free.

 

me too. Trims at -40 point to an issue but youre making a huge jump by blaming it on vvt.

so good luck! Hope you guess the right way to fix it

 

Hi JaguarJackson,

I reviewed your Reported Post notice and do not understand your complaint. Two of our most knowledgeable experts are attempting to help you, but it seems that you are not heeding their input. Have you read that Technical Service Bulletin Bob posted way back in Post #3 and confirmed that the update has been performed on your vehicle? Since this is a known issue with a known fix, have you looked into it?

You can also download the TSB at the link below, courtesy of Bob who provided the file to our member Gus, who posted it on his website, jagrepair.com:

TSB S303-09 False Flagging of DTC P1383 or P1388

Bob and Karl are sincerely attempting to help you. Please help them help you!

Cheers,

Don

 

Alright alright alright …
So I’ve managed to afford a used genuine MAF Sensor , that’s arriving sometime next week 👍 though the MAF Sensor reading seems somewhat normal (0.6 in idle and 1.7 on 1500 RPM)
So now I’m looking forward to reprogram this ‘PCM’

The trims have been perfect after I flushed the oil and driven a few hundred miles with low viscosity oil and a quart of ATF , thou now that it’s been 1500 miles , the trims are negative again especially when I press on gas (-40s) , and the car stalls prompting me to park it and reignite the engine … and I just wasn’t sure if I should just flush the oil again and then load it with some high viscosity Carquest oil along with a good filter , or should I wait till I come up with some cash , reprogram the machine and go from there ?
Oh , and I just wanted to mention how y’all saved me lots of trouble with some awesome expert advice , and that I greatly appreciate it
(despite occasional misunderstandings)
🤙

 

How about
Oh , and the dealerships keep on saying that their computers are too advanced to work on something like my S-type dinosaur from 01 🦖

 

✅
Wow !
what can I say …
Y’all were right !!!
got this original MAF Sensor and the trim’s leveled 📶

 

"Wow !
what can I say …
Y’all were right !!!
got this original MAF Sensor and the trim’s leveled 📶 "

Amazing, eh...?

 

 

Against my better judgement:

What fault codes remain? Did the replacement MAF sensor take care of P1121?