2"x1" module behind the battery
#5
Yes let me get a picture. It looks stock but doesnt mount to anything is in older condition just not sure what it does. I was reconnecting the coolant fan wires to there original relay locations the previous owner had them set up to an outside relay where they ran when the car was started. The just had the car dynotuned for cam and headers 99 c5 stock 4l60e, 3.15 gear tsp headers, 1839 cam and volant air filter. I had to remove the battery to remove the grounds he put for the outside relay at the body battery ground bolt. When i put the battery back in i was looking at the wiring harness behind it and seen that module hanging out of it not sure what it does but the car would start and die for the first few times. I thought maybe it was out of fuel. Finally it started and stayed running as i just had it tuned last week which has run great since. The first start after the cam swap on the stock tune the car idled up real high till it relearned idle then would stahl when revved up 2-3k rpm. It eventually adjusted or relearned the computer and would start and drive normal. Another question i had is removing the battery doesn't erase the tune from the pcm correct? The fans do still come on at 201 degrees first the low speed single fan on driver side and then the high speed both fans at 201 degrees. I had coolant fan adjustments done to the pcm last week when getting it tuned at a local shop for the cam and headers as where the fans were wired to an outside relay with the key on i put them back to the stock 3 fan relays in the engine fuse block.
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Tyler Dietzenbach (02-21-2022)
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#10
I think its a tie in of all 4 o2 sensor grounds, tac, fuel pump micro relay ground all into the same metal terminals clip and ran to a single ground wire on to the drivers side ground at the block.
Last edited by 95maroz28; 03-11-2022 at 09:09 PM.