NSSANE02

iTrader: (14)

I pulled my pcm out a while back and the pin# 57 was broken off into the harness but the car seemed to be running ok before i pulled it. Does anyone know what it does?

shoemike

iTrader: (25)

BLUE CONNECTOR
57 ORN 340 Battery Positive Voltage

RED CONNECTOR
57 PPL 719 Low Reference IAT Pin "A"

NSSANE02

iTrader: (14)

Thanks man, I know what it is I was just wondering what exactly it does because the car seemed to be running fine with it broken.

Thanks,
Cody

wrencher

iTrader: (2)

If it is the orange wire is is likely a retained power memory for the PCM.

NSSANE02

iTrader: (14)

Yes it's the orange one, thanks. If it's just a memory wire would it affect the performance of the car?

poolshark021

iTrader: (8)

Yes. The pcm relearns certain things like fuel trims and idle values while the car is running and stores these values once the key is shut off. If the memory power isn't there, the values don't get stored and they have to be relearned every time the car is started. This can cause the car to run worse than it should while these values are learning after everytime.