ECUTek DTC/Readyness Analysis....

[2forme]

Very simple analysis. If you have an ECUTek tune, does your car report at least one readyness check as incomplete? You have to make sure you've driven at least 100 miles since your last ECU reset, flash, or battery disconnection.

Reason for this is that inspection stations will check the readyness of the ECU systems as part of the emissions testing. If one system is reported as incomplete, you won't get a sticker.

The way to test for this is with an OBDII scanner. Torque has a "gauge" for showing this information in real time. I believe ECU scanning software for the OBDII also have ways of showing this as well.

So let us know in the poll above if you have this issue. Please also designate which vendors tune you have. I'll separate them out as best I can off the top of my head.

Pictures of your readout are also welcome!

I should note, this doesn't mean you have a check engine light. This is a separate check. Just because no lights come on, doesn't mean you don't have this issue.

[King Tut]

I think last time I did a DTC check on EcuTek no codes came up. I will verify tonight before voting.

[Mr.Jay]

Will heck my torque after work

[Foobar]

Using Visconti's latest pumpgas tune since it came out, Torque Pro claims that my Evaporative Sys readiness is incomplete.

I'll switch to Perrin's latest Stage 2 tune and report back this weekend when I have a chance to do that.

[Tim_Asphalt_FRS]

Curious about this for when it comes to smog time. 5 years, but still...


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[jamesm]

Make sure to use a j2534 connector and tis to get all the codes. There are tons of things regular obd2 scanners don't show you.

[2forme]

Yea I'm more concerned with Readyness. My car personally shows O2 System as incomplete.

[Sportsguy83]

Originally Posted by 2forme

Yea I'm more concerned with Readyness. My car personally shows O2 System as incomplete.

I find it weird that people on the same tune have it show ready and not ready, like its random then?

[sw20kosh]

very concerned about this. I will not be buying a tune until this is cleared up?

[brichard0625]

ill def check this out for you because im due for an inspection soon but i do have a cat thats deleted. I know on torque everything reads ready but 02 something and evap system but i just did a reset yesteday and ive only drive about 60 miles. I wonder if e70 will affect this tho

[ducks]

make sure to follow the parameters for an obd2 drive cycle:

http://www.aa1car.com/library/us796obd.htm

in my old car, I drove hundreds of miles after a reset and there were two parameters that were still not ready. on the way to the inspection station, i forced myself to drive at 55mph and it ended up passing.

[King Tut]

Lots of beautiful places to live in Florida. jussayin.

[arghx7]

Originally Posted by ducks

make sure to follow the parameters for an obd2 drive cycle:

http://www.aa1car.com/library/us796obd.htm

in my old car, I drove hundreds of miles after a reset and there were two parameters that were still not ready. on the way to the inspection station, i forced myself to drive at 55mph and it ended up passing.

I'm not sure where that drive cycle came from (maybe some service manual somewhere). Every diagnostic monitor is different. Some are continuous monitors, like misfire, and some aren't, like the evaporative monitor. The requirements under which they must run vary with model years. A few people behind closed doors negotiate details with CARB officials. The ones that show up on the scantool are a tiny portion of all the ones inside the ECU. Most of these are handled directly by communication between CARB and the manufacturer. The customer never deals with them. Here are some examples of monitors you see on a universal scantool:

Typically an evaporative monitor might work in two ways. It looks at changes in pressure across the gas tank as fuel temperature changes (passively looking for leaks). This can happen while the engine is running or when it shuts off. The second way is when the vehicle has a pump to see if the tank holds pressure or not. I'd have to look in the service manual to see if the FA20 uses a pump. Evap monitors often have very specific entry conditions to work, based on fuel temperature & engine run time.

The Catalyst monitor uses an oxygen storage capacity model to see how much oxygen the cat stores as the mixture switches from rich to lean. It uses the rear o2 sensor to calculate the storage capacity. Storage capacity & catalyst efficiency decreases linearly with thermal aging. If the modeled value falls below criteria, you need to force step changes in the target AFR to test the oxygen storage capacity. If it fails the second test, the monitor will throw a code. When one or both of these tests run, the monitor will complete.

Fuel system monitors might look at fuel trims under different conditions.

O2 sensor, MAF sensor, and other sensor rationality checks typically compare the sensor value to some modeled value.

Misfire is a continuous monitor. Usually it calculates crankshaft acceleration. If that's erratic enough times, it sets a code.

Originally Posted by Sportsguy83

I find it weird that people on the same tune have it show ready and not ready, like its random then?

Here's something to consider. The diagnostic monitors are tested on a specific drive cycles (EPA Highway mode, Unified mode, etc). How often they run in the real-world is a separate but related issue that causes friction between the OEM's and CARB. If the monitor runs too often or is too sensitive, it will diagnose incorrectly and throw codes. That will really piss off customers. For example, a misfire monitor is sensitive to rough pavement. O2 sensor monitors depend greatly on rpm and load. There are things called "monitor performance ratios." A performance ratio is basically the number of times the monitor ran vs the number of times it "should have" run. If the ratio is too low, CARB will pursue action and could fine the OEM.

If you took two stock cars with stock tunes and reset the monitors, they would still complete at different times depending on ambient conditions and the driving style. It's not necessarily an issue with aftermarket tunes... maybe changing the MAF scaling might or might not affect certain monitors but I wouldn't get too worked up about this.

[Calum]

@arghx7

I didn't even know you were still reading this board. It's good to see you.

And thanks for making a post I can understand.