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So I need to flash my ecu back to stock. The motor and transmission are not in the car (I do have them). What is the minimum harness connections needed to flash the ecu? Is it the whole electrical system needs to be hooked up or just the main harness? I need to flash it back to stock before I sell it.
 

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when you flash a new tune on a 99-04 it turns on your radiator fans while the tune is uploading kind of as a check to see if you have enough voltage. If you hook that up and then just hook the motors harness to the ecu and a battery (in theory) it should work. just make sure you have enough voltage otherwise your ecu will be bricked if it dies in the process of tuning
 

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i sell out chips to return to stock but they disable PATS also so that no security issues come up. i push them at a cost of 150 bucks shipped.

Flashes will require an SCT or mongoose etc.

If local i can do those and flash them with a stock BIN tune
 
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