Swapped an Evo 8 engine in my 4, using a 6 ECU, and I am having a few electrical problems. I have checked that all connectors are tight. I will list the issues I am experiencing, please help with any that you can.

1. CEL on, cannot check because EvoScan says Battery Voltage is 1.873v when I have a charger on it.
2. AYC light on.
3. No odometer.
4. No blower motor.
5. Rad fan always on when engine on.
6. No interior light.

 

you will have better luck getting answers to this on lancerregister. they have a thread with all the pinouts from all year model evos

 

H should search on ecu pin swaps when installing evo 7-8 ecu on a 6.... It should give you a heads up on where to start... Ayc light should not be on , acc fan pins need swapping as well as fuel pump pins.. Good luck

 

Ecu pinouts need changed , there is more this one thread on how to run 8 harness to 6 ecu.

 

I am using an Evo 6 ECU so all of the pinouts are the same. The ECU was already in the car when I did the swap. I got the engine to start and it runs fine, I just don't want to drive it with an unknown CEL.

 

Just a fuse. OEM 100A was a semi-circle bent wire and it broke at the bottom where I couldn't see.

 

What about the fan issue? I'm getting the same issue with my swap (evo8 motor,evo 6 ecu and evo4 haraness) but everything works fine but the fan. It just keeps running

 

My fan is now working fine. I swapped to an 8 ECU once I fixed the fuse. I hadn't even looked at the fan until you mentioned it again but it is in fact working correctly now. Maybe it has something to do with the 6 ECU on an 8 engine/harness