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In lieu of a new Technical board structure being implemented soon, here are the workings for the new FAQ posts to replace all technical stickies, and hopefully most of your searches.
This is a temporary post because it isn't helping anyone locked away while I'm too busy to finish it.
Please post additional useful links as a new post for a Mod to add to the list.
Mods, I've tried to categorise things logically and keep double-ups to a minimum. PM me any questions.
Every JDM brochure - @chappell943 SUBARU PARTS CATALOGUE - @B4 2000
Workshop Service Manuals - Stoffa Gen 1 Legacy workshop manual - @slystiguy Gen 3 and 4 workshop manuals - @paulngui Legacy 1998-2003 Service Manual (GEN III incl RSK/GT) - @suubyduuby Workshop manual BE/BH 2003MY. Covers TT 4442 pages by Fuji Heavy Industries - @Rosssub FORESTER 1999-2002 Workshop Manual - @luvmaforzzy pdf Engine manual for a Ej20t Dohc - subaru-mania Vacuum Diagrams and Solenoid Placements for WRX - Swindog
Programming Keyless Entry Info All Legacy GT/b's Installation manuals (Timers/Controllers etc) - @Joker Zero Sports Sequential Controller DIY translation - @nncoolg G4 pdf manual - evowrx GFB G-Force 2 Boost Controller Manual Gizzmo Ibc Manual
Model Codes & Specifications
Impreza WRX Classic Model Codes - kamineko JDM WRX ECUS - kamineko JDM WRX Brake setups - kamineko Factory Power/Torque/Kerb Weights for all GC/GF Models. - thorpy How to decipher model/chassis codes (JDM vehicles) - boostin
JDM Legacy applied model codes - readosnr
Legacy BL BP info - subieboy Forester
JDM Forester applied model codes
ECU basics from ScoobyMods including reset & CEL Reading procedures V3/4 Sti Shim under aftermarket valves Part Numbers - @thorpy Intercooler and Other Related FAQ's - @Swindog
Subaru Turbo System explained - @Stoffa Turbo FAQ's - @Swindog More IHI Turbo specs - @Shale
Manual Transmission Ratios - By @Johnnynz Subaru Gearbox Chart V2 - @GC8E2DD Subaru Gearbox Code Chart
Full list of fault codes - @boostin Check Engine Light CEL Codes - @kamineko Subaru ABS Fault Codes Power Light Fault Codes (Automatic Transmission) - arsenal69 Wiring guides and pinouts - @ReubenH ECU Pinouts BC5 BG5a WRX (4 plug) pinouts V7 STI ECU Diagram jollygreenmonster.com ECU pinouts Speed sensor pinout - @gotasuby
Ihave a 94 wrx wagon chassie says it a wrx-sa (sti) 250 hp manual. it has tommy karin rear bumper and tommy karin wheel centers (not fitted at the moment) rear spoiler has triangle bits on the end that no other wagon has,there is a original subaru techincal international sticker on rear hatch thats the only revferance to sti on the vehicle does anyone know anythig about this vehicle like what does the sa mean
Right.. the AFM fixup guide! This is probably most relevant to early-mid 90's AFM's that have no servicible parts in them. The basic idea is that over time the solder joints on the connectors become dry and crack, which makes for a bad electrical connection and sometimes an error code. Even if no code is given, you may experience random loss of power from time to time, which can also be caused by this. Sorry about the blurry photos, it was a crap camera!
Anyway, moving on, you'll need:
Solder wick/sucker (optional)
Soldering Iron (preferably a hot one)
Silicon or some other kind of sealant.
1. Locate your AFM on the drivers side of the engine bay. It's attached to the airbox by bolts, and to the flexi-joint pipe by hose clamps. It's probably wise to unbolt the AFM completely from everything, although not necessary. You'll need to unplug it too!
2. After getting the AFM off you'll need to cut through the black sealant that lines the outside of the circuitry housing. The lid is quite deep so be careful when prying it out, I managed to crack the outer casing from prying too hard.
3. After you get the lid off you'll see a copper EM sheilding plate that is soldered down by one side. If the plate is loose then awesome, take it out, otherwise you'll need to remove the solder to get the sheilding plate out. Solderwick is great for this kinda stuff, but i'm sure there's more than one way to skin a cat.
4. Once that's out of the way you can see some of the circuitry involved in the mysterious AFM. Down one side you will see 4-5 connector pins that go from the main plug on the outer casing through to the circuit board (see number 3 on this incredibly blurry excuse for a photo). Usually these are the culprits! It's always best to remove the old solder before re-soldering, but you can probably get away with not doing that.
If you look down at the pins inside the casing you'll see that they are actually made up of 2 pins connected with a solder joint (one from the circuit board, the other from the plug). Heat the joint so the solder is liquid then remove the old solder, then add some more solder as necessary. If you don't have solder removing stuff then i'm sure that re-wetting the joint should be ok. Repeat for all of the pins.
5. You're done! Put the EM sheilding back on and re-solder it to the grounding connection. Then replace the plastic lid and seal it with sealant to keep moisture out. This should conclude your adventures in to the AFM, and should be enough to have repaired it. I've done several of these and never had any more problems with them afterwards. If you're problem persists then you may need to either buy a new AFM or find one on trademe.
Best of luck!
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