Cascade Crew

BigBoi4Lyph

well on my 87 iroc 5.7 im having trouble with scanning live data on any scan tool.

i can read out live data untill the computer switches to closed loop.

so when its cold i can read codes/live data as soon as it switches to closed loop nothing it reads NO DATA can cannot connect to the ecm for codes or anything.

i can still pull codes by jumpering a-b on aldl

and i dont have any current codes.

any input on this issure im 90% sure the only thing that could possibly cause this is the ECM itself. thanks!

Dewey316 · Posted: Fri Dec 05, 2008 9:59 am Post subject:

What tool are you using to scan it. On the TPI cars, you have to use a 10k ohm resister on a couple of ports to start the datastream flow.

--John

blue89 · Posted: Fri Dec 05, 2008 10:00 am Post subject:

I'll subscribe to this since I have my roommates 87 Firebird I can't stream from.

BigBoi4Lyph · Posted: Fri Dec 05, 2008 10:21 am Post subject:

i typically use a otc genisis and it has a black and a gray aldl connector/adapter and it says to use the grey one for tpi cars so im assuming it has the grey adapter.

also when i first got the car in the summer it didnt have that problem it would read all the time because i did some data logging with it on the same scan tool at work.

thanks

Twilightoptics · Posted: Fri Dec 05, 2008 7:04 pm Post subject:

Gotta jump the A-B terminal with a 10k resistor. Then pick up data. Then remove the resistor.

BigBoi4Lyph · Posted: Fri Dec 05, 2008 8:09 pm Post subject:

so i have to actually jump a-d with a 10k resistor with having the scan tool plugged in to read live data?

like i said it never needed that to read live data when i first got it one day it just stoped working.

but i will try that

Twilightoptics · Posted: Sat Dec 06, 2008 12:00 pm Post subject:

Well I'm remembering now my Auto-Xray you didn't have to jump the terminals. But the tool was hit and miss.

I think I have a spare 165 ECM you can try.

BigBoi4Lyph · Posted: Sat Dec 06, 2008 7:05 pm Post subject:

yea. id like to try out an ecm it would be nice to have the stock prom with it too as i have no idea if mine has ever been tampered with or is eve nthe right one.

so that would be awesome if you had an extra i could borrow/buy/have