So I was driving my 97 auto coupe and it died on me. Reduced engine power light came on, abs light and traction control light as well. After searching forever for a new PCM (they almost don't exist) I found a company that says they can rebuild it local to me. The car would turn over all day, but wouldn't even try to start. So I got the PCM back yesterday "rebuilt" and it's still doing the same thing, but now my security light is on also. I didn't think I would have a security issue since it is my original PCM, but I may be wrong. Anyway, I still have 2 codes.

P0601 - internal control module memory check sum error
P1518 - PCM to TAC module serial data circuit
Both of these codes show up twice (total of 4 codes?)

Now I know if everything was fine, and it was just the anti-theft issue, the car would start and run for about 2 seconds before the anti-theft fuel cut, but it still just turns over. Any ideas? Any help would be great. I'm just a Vette junkie that wants his fix.

Quincy

 

http://www.gearchatter.com/viewtopic...9a3a2ccb25b710

http://www.gearchatter.com/viewtopic...9a3a2ccb25b710

 

You need to use old sch diagnostics to try and narrrow down the sourse
Check to see if you are getting fuel pressure at your fuel rail--There is a schrader valve on the rail-looks like a tire stem---You can remove the stem core and screw a pressure gauge on and turn onthe key to see if there is any pressure OR lay down several rags- pull out the center or just push in the core in and have a friend turn on the key to see if any fuel comes out--The fuel does not come out continuously-- there is a safety shut of bUt you shold see some squirts of fuel come out
If you find there is fuel--then check to see if you have spark
Take out a sprk plg--using the plug wire or a spare wire stick the plug on and then ground the threats or metal body of the plug to a metal spot on the engine--(grounding it) make sure there is NO fuel or fumes present or you will get a fire--- Actually check the SPARK 1st !!!!
While the plug is grounded have someone turn it over and see if you can see a spark jumping the plug gap--- use gloves if you have to hold it in place or an insultated tool or you'll get zapped and have a vision of Jesus !!!
Best is to have it dark like inthe garage with door closed and lights off of low-

ALSO -- you 1st should unload all the unwanted data in your ECM (won't affect the tune) it just clears any spikes or glithes in the ECM
Dis connect the battery overnight--- the night before--

 

Well I put a good PCM on the car (borrowed) and the car starts up and runs for about 2 seconds before the anti-theft fuel cut, so I know I'm getting spark and fuel.

 

If you have anyone around with HPtuners, or EFIlive, you can have them turn off the VATS in the tune, and the car will run. On the borrowed PCM that is. It will have a security light on, but it'll at least run.

Sounds like your "rebuilt" PCM wasn't exactly rebuilt. Probably just replaced the Eprom and flashed it.