Jump to content


Handy EJ20TT Stuff

  • Please log in to reply
10 replies to this topic

#1 Start


    Regular Member

  • Members
  • PipPipPip
  • 536 posts
  • Gender:Male

Posted 05 September 2010 - 01:46 AM

Hey guys,

I've been doing some research on GTB's and have come across a heap of great info.

Thought you guys might want to have a read or add to a sticky? So I put the below together.

Legacy EJ20 Changes
Posted Image
dunno how to attached as .xls

Engine Codes:
Posted Image
Posted Image

What the BBOD Actualy does:
Posted Image

AFM Mesh Removal - http://homepages.ihu...cgrant/mesh.htm
AFM Bellmouth mod - http://homepages.ihu...rant/airbox.htm
Prova ECU Review(15% power gain) - http://homepages.ihu...grant/prova.htm
Whiteline rear swaybar review - http://homepages.ihu...cgrant/sway.htm
Cheap Boost Mod - http://homepages.ihu...grant/antiw.htm
Cold air Mod - http://homepages.ihu...ccgrant/cai.htm
DIY Waterspray Intercooler - http://homepages.ihu...nt/ic_water.htm
DIY Waterspray Controller - http://homepages.ihu...ic_water_II.htm
Another intake mod - http://homepages.ihu...ant/intake2.htm

CEL Codes:
Check Engine Light Codes (CEL)

To identify an existing fault, you will need to follow the following procedure. Please also note that the ECU light flashes to indicate the error code, the slow flashes which come first are the tens digits. The fast flashes that come second are the single digits. For example, an error code of 13 will be one slow flash and 3 quick flashes straight after the first flash, then their will be a short break and it will flash the sequence again.

Identify ECU Fault Code

With ignition OFF, locate black (note in very early Legacyís this maybe white) ECU check connector below dashboard on left side of drivers foot well. It will be two small black connectors, one female and one male which will probably be alongside the ECU reset connectors which are green.
Turn the ignition ON and identify how many times the check engine light flashes (if any). This will be the error code stored in the ECU memory.
Locate the fault code in the chart below and this will identify the fault. If you feel the fault is incorrect, you can reset the ECU by using the procedure below.
Turn ignition OFF and unplug the connectors.

ECU Reset

With ignition OFF, locate the 2 black ECU check connectors and the 2 green ECU reset connectors below dashboard on left side of drivers foot well. There will be one female and one male of each color (Black & Green).
Connect the black connectors together, and connect the green connectors together.
Start the vehicle and drive until the check engine light starts flashing. ENSURE THE VEHICLE SPEED REMAINS ABOVE 11 Km/h.
If there is no fault, the check engine light should flash steadily. If there is a fault, the check engine light will flash the appropriate code which can be checked against the table below and the fault rectified ASAP.
Stop engine and turn ignition OFF.
Disconnect the two black and two green connectors.

CEL Error Codes


Crank angle sensor
Open or Short

Starter switch
Open or Short

Cam angle sensor
Open or Short

Water temperature sensor
Open or Short

Knock sensor
Open or Short

Air flow sensor
Open or Short

ISC valve
Open or Short

Throttle position sensor
Open or Short

O2 sensor
Open or Short

Speed sensor
Open or Short

AT torque down request
Open or Short

Supercharging oppression output
Open or Short

Atmospheric pressure sensor/

Absolute pressure change solenoid
Open or Short

Inhalation valve solenoid
Open or Short

Exhaust valve solenoid (vacuum)
Open or Short

Supercharging pressure relief valve solenoid
Open or Short

Secondary waste gate solenoid
Open or Short

Differential pressure sensor
Open or Short

Sequential turbo system
No rise in pressure or pressure excessive (Over boost)

Exhaust valve solenoid (positive pressure)
Open or Short

Exhaust valve duty solenoid
Open or Short

More Liberty Codes:

Use the following table to work out your car.

Car Type 1st Column 2nd Column 3rd Column 4th Column 5th Column 6th Column 7th Column
Legacy B C = 1st generation sedan
D = 2nd generation sedan
E = 3rd generation sedan
L = 4th generation sedan
F = 1st generation wagon
G = 2nd generation wagon
H = 3rd generation wagon
P = 4th generation wagon
5 = 2.0 4WD
Yearly Model Type Change
A, B, C, D, & etc 4 = 4 door (sedan)
5 = 5 doors (wagon)
Some first generation legacy wagons may have the value 4.
Need to check this. Number range from 3 to 9
The higher the number the higher the grade of the car.
Relates to the model and car specification.

See table below D = 5MT center diff. DOHC turbo
P = 4AT DOHC turbo VTD
T = sport shift DOHC turbo
The grade or specification of the car taken from the seventh column of the Model Number.
1 = A = a starting point - no cars have this spec.
2 = B = Basic
3 = C = Casual
4 = E = Economy, extra, something else than basic
5 = G = Grandwagon, Good
6 = L = Luxury, Lancaster
7 = R = Racing
8 = S = Sport
9 = GT Super Touring and combining VTD
X = unknown = Used on SVX's??
Z = Not sure about this one. Any one seen a Z for the seventh column. Could be something do to with the first Legacy 2 liter engine.
GT = Grand Touring.
RS = Rally Sport, "K" of the RSK " turbo" = kompressor in German
B4 = BOXER and 4WD.


93/10 96/05
RS BD5A48D - BD5A48P
GT BG5A59D - BG5A59P
GT-V Limited BG5A59D - BG5A59P
GT B-spec BG5A59D - BG5A59P
GT B-spec Ⅱ BG5A59D - BG5A59P
GT E-spec BG5A59P

96/06 97/07
GT-V Limited BG5B59D -BG5B59P

97/08 98/05

#2 Alex



  • Members
  • PipPipPip
  • 8,230 posts
  • Gender:Male

Posted 05 September 2010 - 07:05 AM

Good research. It's also good that you've managed to collate most of the info our there on those EJ20TT's.

Not trying to discredit your work here, but...

It has been proven on a number of occasions that some of the information out there in interwebzland, is indeed incorrect.

So I'll add a warning to those TT owners out there who would like to use this information to repair their vehicles:

Convert to single now! (It's so much more simpler, and more powerful!

#3 RX25SE


    ...............Car nerd................ now a H6 pilot

  • Members
  • PipPipPip
  • 12,341 posts
  • Gender:Male
  • Location:Melbourne eastern 'burbs
  • Interests:Cars with chrome bumpers!

Posted 05 September 2010 - 10:40 AM

Nice work mate.
As Alex mentioned lots of info in the one place.

Handy for those of us who know SFA about TT Subarus!

Rep point right there. :)

If I told you I was a compulsive liar, would you believe me?


#4 legacy rsk

legacy rsk

    Regular Member

  • Members
  • PipPipPip
  • 786 posts
  • Gender:Male
  • Location:Sydney, Fukuoka Japan

Posted 05 September 2010 - 12:04 PM

good job...very handy info


#5 CodeBurn3r


    Resident Mexican

  • SubyClub Area Rep
  • PipPipPip
  • 4,047 posts
  • Gender:Male
  • Location:Melbourne, Vic

Posted 05 September 2010 - 11:49 PM

might want to check this out also mate...
got lost a while back..
ams: "Can't live with them, can't throw rocks at them."

#6 Walts


    Resident Stalker

  • Members
  • PipPipPip
  • 18,635 posts
  • Gender:Male
  • Location:Earth

Posted 06 September 2010 - 08:42 AM

Great work mate! Rep point awarded.

#7 Trent


    Trusted Member

  • Members
  • PipPip
  • 257 posts
  • Gender:Not Telling

Posted 06 September 2010 - 07:54 PM

Top stuff! Shit like this should be stickied!

#8 TTimpreza


    New Member

  • Members
  • Pip
  • 13 posts

Posted 14 February 2011 - 07:34 AM

Top stuff! Shit like this should be stickied!

good stuff!

#9 Shadoxity


    New Member

  • Members
  • Pip
  • 93 posts
  • Gender:Male
  • Location:Central Coast, NSW

Posted 08 May 2011 - 11:17 PM

Some great stuff here. good work :D

#10 tmh983


    Regular Member

  • Members
  • PipPipPip
  • 358 posts
  • Gender:Male
  • Location:newcastle

Posted 18 August 2011 - 10:01 AM

I made this TCU pinout reference yesterday. The car I made this from was a '99 gen3 REV A-C JDM gtb etune 1 wagon, ej206 automatic sportshift.

Posted Image

#11 duncanm


    wha' who ?

  • Members
  • PipPipPip
  • 1,860 posts
  • Gender:Male
  • Location:Sydney

Posted 14 February 2016 - 07:52 AM

http://homepages.ihu...leggymodels.htm had a handy list of ECU model codes.. its now gone, so here's a snapshot from the wayback machine for future reference.





Attached File  Subaru TT ECU models.pdf   26.45KB   53 downloads

0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users