Assuming your timing belt is connected to your cam sprockets, you'll turn the engine using the harmonic balancer when you go to adjust each cylinder. Retorquing the bolt is just insurance and piece of mind. Because you're putting pressure on it, it can torque in excess or loosen a little. My buddy and I have had to readjust the valve lash a dozen or so times (for one reason or another) in the past two months, and have retorqued the pulley every time. The alternative is taking off the timing belt and rotating the cams by the timing gear sprocket's bolt... in which case, you'd have to retorque it, and then set your timing again.

As for the ECM/PCM... either pulling the Radio fuse or disconnecting the negative terminal will reset it. You should do it before you start working on the cams, then put it back when you're done. That way you'll know the EEPROM chip is cleared. Good luck. :thumbup: