The VIN is stored in the PCM. Don't let him change or reload the tune. Just verify that the VATS function has been turned off.
The VIN is stored in the PCM. Don't let him change or reload the tune. Just verify that the VATS function has been turned off.
Last edited by RedHeartbeat; 08-13-2008 at 08:04 AM.
See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709
There's really no way I know to bench test a PCM with exception of the aftermarket tuners. I think what was said earlier was the MAF is one of the only 12V sensors as most are 5V. The CMP and CKP are 12V also.
Here is where we are at now, its actually where we began.
the yellow wire has been reconnected to its other half. he then took the purple solenoid wire (from the old harness) and ran it to the starter, turn the key, nothing happens. which is odd, as his truck was running fine with the old engine installed, so this solenoid wire should activate the starter fine but it doesnt.
just for the hell of it, he tested the solenoid wire on the new pcm with his multimeter, to see if he would get 12v with the key in start position...nothing.
otherwise, he is getting power at the PCM where it should be and the fuel pump relay on the new harness is clicking, as it should.
this is with the new harness connected to the Neutral safety switch (NSW). for chits and giggles, we even attached the old NSW to the new harness connection, then we connected the old and new NSW to the old harness NSW connection...nothing.
Last edited by LSXmyford; 08-13-2008 at 09:49 AM.
LSX conversions, so easy a caveman can do it.
after talking with Jon this morning there going to get another pcm loaded and sent out.
1996 GMC extended cab, 2003 5.3/auto
Good luck, It's hard to diagnose an electrical issue over the net, you really need someone looking at it with you. I doubt this is a BCM issue, it's more than likely wiring or PCM/tuning related.
97 GMC, 2002 LS6.
1991 GMC Syclone #1428
I forgot the vehicle is older than the harness and engine. The BCM doesn't factor here AS LONG AS THE TUNE HAS THE SECURITY TURNED OFF.
I keep looking at description and operation for the donor harness/powertrain forgetting the vehicles are often different.
I still surmise it's a security issue which would still be PCM related.
I keep doing the same thing so don't feel bad. This kinda stuff happens when you combine different year models.Originally Posted by GasGuzzler
I forgot the vehicle is older than the harness and engine. The BCM doesn't factor here AS LONG AS THE TUNE HAS THE SECURITY TURNED OFF.
I keep looking at description and operation for the donor harness/powertrain forgetting the vehicles are often different.
I still surmise it's a security issue which would still be PCM related.
97 GMC, 2002 LS6.
1991 GMC Syclone #1428
Shouldnt be a wiring issue, Id be happy if it was though, then this would be over and done with.
To take one more variable out of the equation, he asked them to turn the neutral safety switch off within the computer. Im fairly confident everything else is wired as suggested, and no stock wires were modified....cross our fingers and hope fer the best I reckon.
LSX conversions, so easy a caveman can do it.
Programmer man said you cant turn the neutral safety switch off inside the pcm via tuning.
What do you do to bypass it, just not connect it?
LSX conversions, so easy a caveman can do it.
Correct.
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