Philhippy45

iTrader: (5)

I bought a aftermarket engine harness for my 2000 Camaro z28 and after installing it i had a 550ma battery draw pretty much killing the battery within a day or two depending on the temp outside. But anyway after tracing it to the constant power fuse on the harness it had 3 white wires coming out of it one went to the obd2 port second was for aftermarket tach and the third fed into pin# 10 on the red connector. After pulling the pin it dropped down to about 1ma. Car runs the same without it in. But my question is why would their be a constant power wire going to pin 10? That's for the tach signal wire. Should I leave it plugged in? Or was it a mess up... According to the schematic that wire goes to the ebcm for abs or something. But the way the harness is it comes from battery through fuse splits into 3 and one goes to pin 10. Could that also have messed up my car too because the tune shop could never get it tuned right and runs like crap because of that. Or would that not effect the tune?

Old Geezer

iTrader: (3)

Any answer[s] from the harness mfgr?
What reason did the tuner give, for not being able to tune it?
The ecm is obviously getting a tach sign, as it runs. I'd leave it out, tape it off, and go to finding why the tune is not right.
Can you post the tune and a data log[s]?

Philhippy45

iTrader: (5)

Psi said should their be no way a 12v constant in that pin area. And as for the tune they never really gave me a reason as to why. They said the way the car was acting was normal and that it's because of the cam and being a 408. But i called several tune shops and they all said that its not normal. So i was just wondering what kind of harm that it may have done sending 12v into and output pin of the pcm and maybe that's why the car was tuned improperly and maybe they just thought it was normal. As for the logs I'm taking tue pcm to another place today have it checked but I don't think he will be able to pull the tune because the guy locked the pcm.

truckdoug

iTrader: (25)

where are you at? i can unlock it for you

Philhippy45

iTrader: (5)

I live in pa

truckdoug

iTrader: (25)

yeah thats a bit far haha opposite side of the country

G Atsma

OK, rev up those psychic (or is that psychO??) powers and do this telepathically.....

truckdoug

iTrader: (25)

have you followed along in PeteS160's android thread? his LS droid tool can unlock tuner-locked pcm's

Philhippy45

iTrader: (5)

no never heard of it lol

rpturbo

iTrader: (47)

I went through a very similar situation with a p59 I had. I never traced what it was leaving powered on, but it was powering something and would kill the battery in a night. Unfortunately it took me quite awhile to finally diagnose the ecm being the issue, since I had done several modifications at once.

Philhippy45

iTrader: (5)

mine was for some reason 12v constant was being put into red10 which isn't suppose to be there. Now my problem is trying to figure out if that's what caused 5 and 7 to be fouled out and make a tune bad or if its something else...