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tomtom72 · 07-26-2007

I bought a used snap-on MT-2500 scanner. I sometimes use it when I drive just to see what the ECM sees from the sensors. I know for sure that the guys that do "data logging" use software programs that let you hook up a laptop to the ALDL port and drive & record the data for play back later so you can study it. I'm not too swift on this 'puter stuff so all I know is there is a soft ware that you can buy, a cable to plug the laptop into the ALDL, and you can either use it on a dyno or you can do "street tunning" by logging the data(recording the data on the hard drive(?)) & look at it later.

Sorry that's all I know about this stuff.

A thought just hit me: If the scanner is plugged into the ALDL maybe it is just reading the data flow? Maybe if you use a "jumper" you are putting the ECM into test mode??? I know that I use my scanner to do the KOEO readings and I can start the car & watch as the data changes as the car goes from "open loop" to "closed loop". Stupid Q from me: you know that the ECM is good? If not sure I have a spare ECM with a 90 EPROM in it I could send to you to test if you think that would be of any use?

Tom

07-26-2007	#14
tomtom72 Join Date: Dec 2004 Location: Jacksonville, FL USA Posts: 4,609	Re: A serious problem I bought a used snap-on MT-2500 scanner. I sometimes use it when I drive just to see what the ECM sees from the sensors. I know for sure that the guys that do "data logging" use software programs that let you hook up a laptop to the ALDL port and drive & record the data for play back later so you can study it. I'm not too swift on this 'puter stuff so all I know is there is a soft ware that you can buy, a cable to plug the laptop into the ALDL, and you can either use it on a dyno or you can do "street tunning" by logging the data(recording the data on the hard drive(?)) & look at it later. Sorry that's all I know about this stuff. A thought just hit me: If the scanner is plugged into the ALDL maybe it is just reading the data flow? Maybe if you use a "jumper" you are putting the ECM into test mode??? I know that I use my scanner to do the KOEO readings and I can start the car & watch as the data changes as the car goes from "open loop" to "closed loop". Stupid Q from me: you know that the ECM is good? If not sure I have a spare ECM with a 90 EPROM in it I could send to you to test if you think that would be of any use? Tom __________________ 1990 ZR-1, Black/grey, #2233, stock. ZR-1 Net Reg Founding Member #316 & NCM member Last edited by tomtom72; 07-26-2007 at 12:26 PM.