UNABLE TO SCAN ENGINE CODES

[GOFAST]

I have a '95 with 9000 miles. The "Service Engine Soon" light comes on intermittantly, stays on for a few seconds, and then goes out. I have tried to capture the stored codes using a scanner but the scanner has been unable to connect/communicate with the ECM.

Two different scanners have been unable to link/communicate with the host but both work fine on my other car. My '95 has a OCB2 connector. Any idea as to why the scanners can't connect with the ECM?

Thanks.

[VetteMed]

95 has an OBDII connector, but is OBDI. You can't use an OBDII scan tool to talk to the ECM. You need an OBDI scan tool with the OBDII connector.

[scottfab]

Originally Posted by GOFAST

I have a '95 with 9000 miles. The "Service Engine Soon" light comes on intermittantly, stays on for a few seconds, and then goes out. I have tried to capture the stored codes using a scanner but the scanner has been unable to connect/communicate with the ECM.

Two different scanners have been unable to link/communicate with the host but both work fine on my other car. My '95 has a OCB2 connector. Any idea as to why the scanners can't connect with the ECM?

Thanks.

Does the scanner lit say it works with a 95 ?

[GOFAST]

My scanner is both OBDI and OBDII compatable. How do I assure the scanner is in OBDI mode with the OBDII connector?

Thanks.

[ghlkal]

I know the 95 is a hybrid with OBDI but an OBDII connector.

Can you do the earlier OBDI "trick" of connecting pin "12" to pin "4" (I think those are the right connectors on a 95) and turn the ignition on and have the dash display CCM and ECM parameters?
http://www.zr1.net/forum/showthread.php?t=17846

[scottfab]

Originally Posted by GOFAST

My scanner is both OBDI and OBDII compatable. How do I assure the scanner is in OBDI mode with the OBDII connector?

Thanks.

If it's both you should be in.
What scanner did you get?
Does it have a manual online?

[tomtom72]

I have a snap-on MT2500, it's an old one too. On it the software cartridge you use is what enables the "communication link" to happen. Sometimes I forget and leave in the OBDI stuff when I plug it into my 08 Cobalt.

[GOLDCYLON]

Referring to whats already been posted above. The 95 is indeed an OBDI and OBDII Hybrid. MY 96 was the first OBDII corvette. I think Andrew said that as well.

With this in mind a OBD1/OBD2 scanner should work but you will need either the correct cable, the correct cartridge or the correct mode to be set on your reader/scanner

So lets start over again here. What model scanner or Code reader are you running. Some of us use multiple models and maybe able to help with the setup. I use a Tech 1A or an Auto X-Ray 6000

[GOLDCYLON]

Originally Posted by scottfab

Based on what you've posted I found what I think is the manual for it at:

http://buy1.snapon.com/products/diag...Operations.pdf


Does this look like the manual you have?

One quick point of isolation you can do is take the car to an Autozone or O'Rileys and get them to hook up one of theirs to see if the port on you car is ok. Probably not necessary but would guarantee pursuing the MT2500 unit is not wasted. Who knows maybe the port got damages when someone tried shorting some pins?


I do see some posts about updates for the MT2500 but it's not clear to me that you would need these.

Scott. Your confused. Tom has the Snap on Scanner. Not the OP. He has not identified the equipment he is running yet. Which IS part of the problem. GC

[GOLDCYLON]

Originally Posted by scottfab

So you're saying the manual I found is wrong? And he would not be using the MT2500 ? Or is there a module he's missing that works together with the MT2500 or wire harness, and therefore the manual I found is correct? You must know the snap-on scanner well?

Scott reread the post. The OP GOFAST has not identified either of his two scanner or readers.

Thats my point Tom is the one with a MT2500 scanner. Your link is for Toms model and not the OPs

Still confused?

Originally Posted by scottfab

You must know the snap-on scanner well?

As to this comment Scott why do you consistently feel it necessary to attempt to chide the membership in your posts?

No I do not know the snap on scanner well. As aready stated I know the AutoXray 6000 and the Tech 1-A well.