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Old 01-03-2019, 01:37 PM   #2
trueno92
Scooby Specialist
 
Member#: 111755
Join Date: Apr 2006
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whether you run the JDM ecu or not doesn't matter to the engine. Yes, the JDM ECU has more aggressive timing designed for JDM RON Octane standards, but your JDM EJ205 is probably 9:1 compression ratio. If your USDM ecu is going to be running high timing advance, it will also have problems hitting those targets without ping or knock.

The usdm ecu just has COBB AP as another available tuning option, where COBB doesn't support JDM ECU's, however you should be fine if you were to go open source. check out rom raider. if you are going to have the ecu tuned, the timing will be changed either way no matter your ECU.

now for your codes, you are only seeing 1 code because all the AVCS features are not part of the USDM ECU program. The actual hardware and trouble codes do not exist in the USDM ECU.

At the very least you will see 4 codes since the AVCS system is not getting power:

AVCS CAM Sensors
P0365
P0390

AVCS Oil Solenoids
P1306
P1308

The harness is pretty straught forward (I struggled with it for days, but i botched it, and finally with the correct parts, i made a solid harness) and the engine with AVCS is a whole world of difference unless you are above 4k rpm every time you press the gas.

Check out romraider.com any tuner should be able to get you to your targets with a tactrix cable.
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