Here's some info about the ECU pinout: http://www.hybridgarage.com/tech/5gt...html#ECUpinout

And here's what you wire to where: http://www.hybridgarage.com/tech/5gt...ex.html#B18EG6

I don't imagine that the B18C5 would be that much different than the B18C1, but this page says you need to do the OBDII conversion for a C5.. :dunno: I did a C1...