There are two routes to installing AVCS…

1. Buy (or make) two wiring harnesses. The left hand side of car is for the AVCS solenoids & the right hand side is for the AVCS sensors.

2. Make a harness for only the right hand side and reuse the wiring from the USDM TGV system for the left hand side.

Note: for the right hand side (the sensors) you must use individually shielded wire!

I went with option 1 because it is SIGNIFICANTLY easier. Pulling pins out of the harness is a royal pain. I wanted to save some time, so I purchased a pre-made wiring harness from IA Performance. With this kit, the install took me under 30 minutes to complete.

Addendum: The connectors of interest are the middle one on the ECU (smallest connector), the black bulkhead connector next to the battery, and the grey bulkhead connector next to the boost control solenoid.

AVCS CEL code disable

With the motor now installed and the car back in Chicago, I have a few posts to catch up on. This one will cover disabling AVCS codes that appear from plugging in the JDM motor wiring harness to the USDM connectors without the additional wiring required for AVCS. The reason I did this is so I can temporarily drive the car without CELs. Here is everything required:

– Tactrix cable ($150 for v1.3) & flash block
– RomRaider (free)
– ECUflash (free)
– Windows Laptop

The codes to disable are:
P1306, P1308, P0390, P0365

Follow these tutorials to disable them:

Purge Control Solenoid

My motor came with one of the purge control solenoid hoses disconnected. It had a white T-fitting (aftermarket) inserted and was hanging loose. For reference, I will post the differences between the USDM and JDM purge control systems.



As you can see, the JDM setup is much simpler. According to IA Performance, you can delete the purge valve on a USDM and convert it to JDM with no Ill effects. The hoses on the purge valve are known to come off occasionally, so this might be a solution for those running USDM setups.

cracked timing belt covers, and what to do about them

Like other people that have purchased JDM motors, my timing belt covers were cracked in a few places. It’s a long trip from Japan and you can expect these kinds of things to happen. Seal up any cracks well – you don’t want to risk something getting in and shredding the belt. I purchased a set of used covers from a NASIOC member, but JB Weld would have probably worked just fine. I also went ahead and painted the covers with Krylon Fusion (plastic bond) satin black paint. The covers cost about $100 new from Subaru, whereas I paid much less for the used ones and paint.

I added part numbers for the JDM covers to the compendium for reference.