I just bought an unmodified 94 Z-28 and the check engine light comes on as soon as I begin to move the car and also the cooling fan comes on. I tried to pull the codes and all that happens is that the cooling fan comes on, never even get a code 12. The car runs normal besides the fan staying on. The fan does shut off when I come to a stop. Any help would be appreciated!

 

You using a scan tool or trying to flash it at the DLC? Thinking '93 was the last year you could flash codes.

 

I'm using a scan tool.

 

...not a real scan tool if you are looking for a flash of code 12. You can't do that on a 1994. You need a real scanner.

 

On my 93 as soon as my SES light comes on the fan comes on. It ended up being the EGR system. I read in the GM service manual that certain DTC's will automatically turn on the fans. It sounds like that code only comes on at certain times. Also when i flash the codes on mine the fans cut on while you are flashing.

 

I first tried the jumping the 12 pin connector as described in my haynes book,when that didn't work I bought an actron code scanner which is supposed to work with the 1994 LT-1, that did the same thing. Thanks for the responses, keep them coming.

 

Just glanced at their site, for 94/95 GM they ask for more car info - sure they sold you the right one? You have power to the connector and the CIG/ACCY fuse is OK?

 

New to this, not sure what you mean, the vehicles on the instuction book definately name the camaro 5.7 as one it will scan.

 

OK, this is what I was looking at: http://www.actron.com/product_detail...id=16152&id=18 Check the fuse either way, might need power to work - now I understand about the flashing - it's evidently supposed to do that, just not familiar with their product.

 

Here's the bad news. The Actron code reader will not work with the LT1. I know it says it will, but it won't. I'm assuming this is the one that costs around $30.

 

That's the one, shouldn't the jumper wires work though?

 

'93 was the last year the jumpers would work. You'll need a real OBDI code reader or OBDI scan tool to pull the codes.

 

The Haynes book is wrong, the Actron info is wrong. Three people above have given you the correct answer. 1993 was the last year for shorting the pins - and that's all you get with the Actron you have, a fancy box with a switch that serves the same purpose as a 1-cent paper clip. Maybe a 4th identical response will convince you

 

Like I said, I'm new to this, I'd much rather spend the money to buy a tool that I can possibly use later then fork over $$ to my local chevy dealer for a scan. Everyone is telling me what won't work, give me a recommedation of a scan tool that will work.

 

I use the Actron CP9150 to scan my 94. It includes obd1 and obd 2 cables. This is a link to the place I bought mine.

http://www.tradervar.com/cgi-bin/sto...age=cp9150.htm