Jet DST (OBD2) question

For those of you with OBD2 tuning software, I'm planning on purchasing the Jet DST to tune my 97 with. And before some of you suggest it, swapping to OBD1 is not an option, I'm in an emissions county. Anyway, since my tuning options are limited, Jet DST sounds like my best bet. However, I've read conflicting information whether or not it comes with a data logger. Can anyone confirm this? And if a separate one is needed, can you suggest one? I'm not quite ready to go full blown tuner on this car, but I'd like to poke around and change a couple things, particularly the annoying SES codes I have.

I've got one I bought thinking id use it in my socketing business but I've only fixed one so far and I used his cable. Then I thought id see if I could replicate it and sell at a lower cost being that they are so expensive. I had my electronics guy disassemble it and there's a (obviously) proprietary microprocessor in it that's he's afraid he won't be able to duplicate it so he stopped there. Nothing was desoldered or removed. It has never been used and still has 4 credits on it. If you haven't bought one yet I'd sell it for $200. I will open the program up now and see what I can find with data logging capability and report back.

I live in an emission state as well. I have an Obd2 computer with a passable but.less powerful tune for that.

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That was a thought popo, but unfortunately the problem is that the OBD2 tune I have now won't pass smog, because of the codes I have on it. I've tried for a long time to get Moe to come back to Houston and take a look at it, but we both have busy schedules. So right now I just want to say fuck it and get it done myself.

firebird_1995, I'm understanding that all you basically did was crack open the case and have a look, correct? $200 sounds a heck of a lot better than $500.

What are the codes? Maybe they are things that can be turned off.. or addressed via mail?

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P0443 (EVAP purge solenoid circuit) and P1657 (CAGS). At this point, I'm honestly fed up with mail orders, since these problems started when I let PCM For Less screw it up a few years ago. I've been putting this off for too long, and just want it done. Getting into tuning it myself would be a happy bonus.

moe could not turn off my evap solenoid one... so I put it back on.. plugged in the electical connection.. but left it un hooked grom EVAPn... prob solved.

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You should be able to eliminate both those codes with a resistor. People have been defeating the skip shift (CAGS) code with a 2Kohm resistor since 1994. The diagnostic just looks at the voltage on the circuit. As long as the PCM does not see battery voltage when the solenoid is supposed to be powered (open circuit), nor 0V when the circuit is not supposed to be powered (short circuit), it won't set the codes.

Same idea.. just used the solenoid as the "resistor" lol... the comp thinks its functioning.

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Originally Posted by Spartan7

firebird_1995, I'm understanding that all you basically did was crack open the case and have a look, correct? $200 sounds a heck of a lot better than $500.

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You are correct sir. Its a very well built piece actually. Aluminum body that screws together. There is a sticker with the model info on it that covers the seam between the two halves of the case. I had to cut that sticker at the seam, but aside from that, its untouched.

I appreciate the help guys, see the below thread for all I've done with P0443. I've been up and down the troubleshooting road many times. I have the proper CAGS resistor in there, tried bypassing the stock wiring, and Moe disabled it in the tune. Yet the code remains. It all started after PCM For Less did the tune, yet nothing was changed as far as the CAGS circuit. This leads me to believe the PCM or tune is at fault. I had Moe install the same tune on a spare PCM, yet both issues remain. I am also not trying to delete EVAP, everything is still in place.

http://m.ls1tech.com/forums/showthre...268&styleid=25

Injuneer, any idea what size resistor I would need for the EVAP purge solenoid? I didn't think a resistor would work since it is a PWM signal rather than the on/off type like CAGS or reverse lockout.

Im tellin u.. if u still have the noid.. just plug it back into the harness. done

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Are you talking about the solenoid itself popo?

The description of the solenoid diagnostic circuit indicates that it only checks for an open circuit or a shorted circuit. People have replaced the EGR solenoid successfully with a resistor, and it works. EGR is PWM also.

Are you saying you get the codes, even with the EVAP solenoid connected to the harness, and with the skip-shift solenoid connected? Again, people have been bypassing the skip-shift this way, and eliminating codes since the first F-Body skip-shift solenoid appeared in 1994 models. Measure the resistance of your EVAP solenoid. I think it's in the range of 15-30 ohms. A larger resistor will keep the current lower, reduce the power rating requied for the resistor, and still provide an acceptable voltage signal when the circuit is energized.

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Originally Posted by Spartan7

Are you talking about the solenoid itself popo?

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yes

LTXtech.com is my DRUG!

Quote:

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Originally Posted by Injuneer

The description of the solenoid diagnostic circuit indicates that it only checks for an open circuit or a shorted circuit. People have replaced the EGR solenoid successfully with a resistor, and it works. EGR is PWM also.

Are you saying you get the codes, even with the EVAP solenoid connected to the harness, and with the skip-shift solenoid connected? Again, people have been bypassing the skip-shift this way, and eliminating codes since the first F-Body skip-shift solenoid appeared in 1994 models. Measure the resistance of your EVAP solenoid. I think it's in the range of 15-30 ohms. A larger resistor will keep the current lower, reduce the power rating requied for the resistor, and still provide an acceptable voltage signal when the circuit is energized.

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Interesting. And yes, the EVAP solenoid is still connected to the harness. I've already ensured the PCM driver is working and the PWM signal is being sent, used 3 different solenoids, bypassed wiring, etc. I don't have a physical CAGS solenoid to plug into (never had it, just plugged the hole), but I do have the 2.2k 1/2w resistor in there, which was working just fine as a CAGS delete before the last tune that messed it all up. So I'm pretty much stumped at this point, and hoping it's in the tune and just something Moe missed.

I will try a resistor when I get home, won't be back until the end of the month. I do appreciate all the help guys, these codes have been driving me nuts.

JET DST gets the job done but is expensive...sorry to hear youre still having issues.

Speaking of which, your tracking number is...
9114 9012 3080 1079 7275 60
It will be there Saturday.

You're the man. I'll be home on Monday, looking forward to getting some things done. I'll definitely let you all know how it goes.

If it is fudged up you might have to have a stock tune from GM or a tech unit that can do it to get that issue fixed. And then continue your tune from there, Unless you have an original tune before you made any changes that is.

Wait, so does the JET DST do data logging or no? This is one of the few things I am wrapping up on my car. Solomon just sent me my tune, and I am hunting down a new knock sensor and a new LT4 knock module.

No the DST does not datalog, you will need additional software for that.

I got it, thanks firebird. It works just fine, I disabled the codes I was having problems with and no more SES lights! Now I have a new question. Since I am in an emissions county that does the plug-in OBD2 test, all the readiness flags have to be there. In "Emissions Controls", I have a few options for "no reporting". Which one of these should I use so that the code is disabled, but reads as ready for a smog check? See attached screenshot.

Attachment 27988

I think "no mil type d" but I'm just guessing. I forgot to add I'd did actually come with the CD and some sweet stickers! I'm glad you'll get some use out of it. All it did was sit here.

Nevermind, Google ftw. It doesn't even matter, because there is no EVAP readiness flag for our cars. I also just discovered that my handheld scanner can read readiness checks, never knew it could. I just need to drive it around a bit more to get the O2 sensor check to complete, toss the AIR pump back in there temporarily, and I'll be off to get it inspected.

Just thought I'd let you all know it passed inspection today. :finger:

Sweet. Now you can play with the tune. Or resell it with one less credit. I think it comes with 4 and it was never used so it should still be good for 3 more vehicles.

Yea, all the credits were there. I think I'm going to keep it, it will work on my truck too. Thanks again man, this is a huge weight off me.

No problem! Glad you could use it.