Any idea how to get Fuel System monitor to ready?

[Georound]

I have a 2013 LR4 5.0l. About 120k miles. Runs just fine. Went to Smog test it Friday. Failed due to the fuel system and other monitors are showing as not ready. This monitor should run at each start up per the tech. No codes, no lights on the dash. I have a Gap IIDTOOL.
I did a hard reset yesterday and drove it for about 100 miles on the freeway today.

Any idea or tricks to get the Monitor to a ready state? Is there something that is preventing it from completing but wouldn’t throw a code?

I am afraid that the dealer will just shotgun, including new ECU. Wondering about a reflash.

Thanks

 

[discostew]

Sounds like your just going to shotgun it yourself. Are you clearing codes right before you go for the test?

 

[Georound]

Nope, I Didn’t clear them initially, and the monitor status hasn’t changed since I started looking at it even with a clear, hard reset and long drive. I would like to understand what could cause the Fuel System to stay not ready with no obvious codes.

I am hoping to avoid needlessly replacing parts (especially the ECU) as I don’t have any of the common symptoms of a poorly running vehicle. Fuel consumption and idle are good. Runs strong and No check engine light has illuminated. I would expect any real issue to turn on the CEL. I can see the
Seems like a software issue as there are no meaningful codes that the Gap will show.

If someone has had a similar situation and resolved the issue, would love to hear what was the resolution.
I’ll take it somewhere with a pro level computer and may reach out to the guys at GAP Diagnostics tomorrow.

Worst case, there are ECU cloning and repair companies if needed.

 

[jymmiejamz]

Why would you think they would diagnose it as a failed power train control module? I’ve never seen one fail that wasn’t just full of water.

Prior to getting a smog test, when was the last time you cleared the faults or disconnected the battery? Doing either of those things will clear all of the monitors and you are basically starting from scratch with drive cycles. My guess would be something you did with the gap tool has reset the monitors and now you need to just drive it.

 

[discostew]

Nope, I Didn’t clear them initially, and the monitor status hasn’t changed since I started looking at it even with a clear, hard reset and long drive. I would like to understand what could cause the Fuel System to stay not ready with no obvious codes.

I am hoping to avoid needlessly replacing parts (especially the ECU) as I don’t have any of the common symptoms of a poorly running vehicle. Fuel consumption and idle are good. Runs strong and No check engine light has illuminated. I would expect any real issue to turn on the CEL. I can see the
Seems like a software issue as there are no meaningful codes that the Gap will show.

If someone has had a similar situation and resolved the issue, would love to hear what was the resolution.
I’ll take it somewhere with a pro level computer and may reach out to the guys at GAP Diagnostics tomorrow.

Worst case, there are ECU cloning and repair companies if needed.

So If this car came into a dealership it would probably get passed a few guys. These kind of problems are usually not easy to fix, and would probably get bumped up to a more experienced tech. And you seem resistant to go to the people who know the vehicle and prefer to throw darts at it from your driveway.

Well I'll try to help you pick the right dart. And maybe we can just avoid those dealership scumbags all together.

If you have a car that you really didn't clear the faults somehow with that gap tool, and what your describing is really accurate then I would be looking at your fuel trim. There is a few cars I have seen that the fuel trim always stays lean, but not far enough lean to store a fault code. That's really the only way I've seen them not pass all the readiness tests with no faults stored. So if you do in fact have fuel trim that is staying lean, I would suspect the two round breather diaphragms is starting to leak.

 

[Georound]

To close the loop. Drove awhile, heated cat, egr and fuel system still not ready. Egr went ready on the way to the shop. Local independent found no errors. Flashed the PCM/ECU with newest software release and tightened a Positive battery terminal that could be moved by hand. He thought that could cause an issue. $255 dollars for diagnosis and flash.
Less than 70 miles later, all monitors ready. Happy as a clam. Not sure what made the difference. I will say the fuel system was the last one to go green. The heated catalyst turned right before. EVAP went green after sitting overnight.

So, the Fuel System monitor does not change immediately at startup even though it’s called ‘continuous.’ Documented for posterity.
Here are some screen shots. The next to last counter (Secondary O2 sensor monitor) turned from 3 to 4 and then all monitors were ready.

 

[discostew]

Looks like it's just your evaps. Some of those you don't have and a better scanner would say not supported or something. So that is the one test that takes a lot of time. And if fuel trim is off it might not run it. So see if you can post a pic of your short and long term fuel trim.

Actually it looks like you should be all set with that bottom picture. You dont have a heated cat, and I'm not sure why they have a/c refrigerant listed. Also the car does not have secondary air.

 

[Georound]

I have a GAP but that isn’t easy to seem monitor state. Trims seemed good. Here a snip from before the tech flashed and reset the adaptations. The column ‘available’ agrees with you.
Before:


Here is now with all monitors green:

 

[Georound]

There are many PIDs reported. This is with all monitors green.