is the fuel pump priming? if there's a problem w/the Pass Key (BCM) it will cause the fuel pump to not prime.. (it sends a ground to the fuel pump relay), then when you crank you'd be dumping all the pressure out... fuel pump isn't a fun job so make sure you're 100% sure that's it (try manually jumping the relay)

The Fuel pump should prime for a second or two when the key is first inserted to get fuel pressure up

 

It primes just maybe a second if that long, it sounds kind of ill not a nice hmmmm sound like normal. I have a friend who has a shop so the tank drop will be easier, that is also why I am asking dont want to if I dont have to.

 

Well changed the fuel pump and no luck. Check the computer with my friends Tech 2 and had a code 601 Internal Control Module Memory Check Sum Error. Computer fried?

 

P0601 INTERNAL CONTROL MODULE MEMORY CHECK SUM ERROR

http://www.hptuners.com/forum/YaBB.p...20;start=25#25

This will kill the gm computer. Sorry.

Ryan

 

It's a checksum error in the PCM. You need to write the PCM again or rewrite entire (depending what happened to get it this way). BTW, you will see this DTC on VCM scanner.

Either way our s/w is able to recover from this error.

Chris...

 

So is it purchase time or have it flashed at the dealer or will my friends tech 2 flash it?
If I need to buy a VCM will any '98 computer work? And where is the best place to get one.

 

I have also already tried to re-write entire vcm... no luck
Chris I assume that you are with Hp tuners. If so then I was e-mailing you about two weeks ago about this.

 

Just tried to re-wrie entire vcm and then write vcm and no luck

Something I remember now is when this all started I think I got an error

Security Codes Denied - Required Delay not Expired
or
Security Codes Denied - Invalid Authorization Code

 

yes, the binary file you emailed me is valid it writes to the 3 or 4, 98 PCMs i have no problems. From memory that was where we got to last time you emailed us at support. Certainly is a strange one.

Chris...

 

What do you mean by that?

 

I can flash and read the binary you emailed me to the four 1998 PCMs i have here on my bench without a problem. If you read the PCM and the binary file opens in the editor it is valid and the checksum is correct.

Please email me at support@hptuners.com if you have any more questions.

Cheers,

Chris...

 

Had the same thing happen on a buddies car a few weeks ago, disconnect the battery for 10 minutes and after you reconnect it try to write the vcm again. It worked on my buddies car.

 

did it throw a P601 error?

I have a dead pcm because of that code as well, i should try it again now, it has been on a shelf for many many months

Ryan

 

Yes it through the P601 code

Tried the battery trick did not work also it was unplugged for about an hour while doing my fuel pump install.

 

******* ****, the exact same thing just happened to my buddies 98 with hptuners.

Loaded the file now it won't start. No voltage coming from the vcm and the fuel pump relay is clikcing. Tried resetting the computer, d/c the batter,switching fuses and nothing. It wont read or write the vcm,. Hptuners states no vcm found.

Any ideas?

 

Can HP Tuners fix this PCM?

Thank you.

 

Hey guys, i fix everyones computers for free. jessebubb@yahoo.com

 

Same thing happened to my buddies 98, and he had to swap the computer. With the new computer in it fired right up. I heard the 98's are a touchy computer to play with, meaning harder to recover.

 

i skipped over a few posts but can you hear the pump prime? when i locked my computer the pump wouldnt prime the car woudl just turn over

 

Ok you guys scare me. What did you do to fry the pcm. I have hp tuners and I am getting ready to write my pcm with a new file. I am worried that this will happen to me. What precautions should I take to make sure this does not happen to me. DAMN 98's