Quote:
Originally Posted by lukeskywrx
Bet you the NPS is wrong. The 581 ECU is going to look for an inverted NPS which came on the V8 cars and 05+ USDM STI. The 02 WRX and V7 JDM cars have a non-inverted NPS.
AVCS is inactive when the car is in neutral, with the wrong NPS the car will think it is in neutral when it is in gear resulting in no AVCS. You can swap the NPS with an inverted one from a later model USDM STI and it should take care of you. Think they run about 50$ at the dealer.
It is tempting to recode the 581 rom to add a selection for the NPS since so many people have this issue, the carberry SD rom has this feature so you just select inverted or normal NPS. Carberry rom works great on the 581 by the way, ditch the MAF and don't look back.
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the car is an 02 wrx, with the v7 and 6spd jdm transmission (should be matching v7 engine/trans, they came together.). so I would be looking to get an inverted NPS out of later model sti?
a followup: if the ecu/motor/transmission are all jdm why does the 581 need a different neutral position sensor (non-inverted to inverted)? is it because the 581 jdm ecu is different than other jdm ecu's?