Apexi PowerFC FAQ
Taken from the FAQ
"My car won't start when I plug in the PowerFC, but the stock ecu works fine
First when dealing with a new PowerFC install and the car does not start there are a few basics to check;
Check the PowerFC to car loom connector
Check the warning lights on the dash, do they come up?
On the hand controller, goto ETC, SENSOR SW CHECK, are any sensors highlighted in black? (Shouldn't be)
Make sure you disable the Boost Control Kit if you aren't using it
Make sure you have the right airflow meter selected (if you have a non standard one)
Make sure you have correct injector settings (if you have non standard ones)
Check all fuses
Listen for clicking relays
Check for burning smells near the ECU and or inside the ECU
Inspect the ECU itself for physical damage or burn marks (open it up) "
I'd check the bold ones, since your hand controller isn't powering the rest are hard to do...
I wouldn't open up the unit unless you know what you are doing, it may sound silly, but smell the PFC ECU, if you are at all familiar with the smell of burnt electronics, you will know what you are checking for.
Hopefully it is a fuse or ground issue.
Good luck.