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#1993 Legacy, diagnostic code questions

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 Post subject: 1993 Legacy, diagnostic code questions
PostPosted: Sat Jan 13, 2018 11:31 pm 
First Gear
Joined: Mon Apr 16, 2007 12:55 am
Posts: 89
Location: Near Seattle wa
Ok when connecting the two black connectors together (super difficult to find), I get one long flash a delay then I get another long flash a delay then 2 quick flashes.
What is the code? It can't be an 11 can it will car run with bad crank sensor signal? And if its a 12 what does that even mean or do?
So I don't understand what its reporting.

Thanks


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 Post subject: Re: 1993 Legacy, diagnostic code questions
PostPosted: Sun Jan 14, 2018 1:17 am 
First Gear
Joined: Wed Oct 16, 2002 9:04 pm
Posts: 121
Location: Michigan's Upper Peninsula
From your description, it sounds like it's flashing a code 22, knock sensor, which is common on the first gens if it's the original sensor due to brittleness/breakage in the harness. The following link to DLC's how to page should clear it all up:

http://legacycentral.org/library/literature/codes.htm

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1991 Legacy SS 5-Speed

1999 Impreza 2.5RS Coupe


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 Post subject: Re: 1993 Legacy, diagnostic code questions
PostPosted: Sun Jan 14, 2018 4:50 am 
First Gear
Joined: Mon Apr 16, 2007 12:55 am
Posts: 89
Location: Near Seattle wa
Wouldn't that be a quick 2 flashes then a short delay then another quick 2 flashes?


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 Post subject: Re: 1993 Legacy, diagnostic code questions
PostPosted: Sun Jan 14, 2018 4:51 am 
First Gear
Joined: Mon Apr 16, 2007 12:55 am
Posts: 89
Location: Near Seattle wa
If memory is correct I think I changed the knock sensor back when this engine was put in the car.


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 Post subject: Re: 1993 Legacy, diagnostic code questions
PostPosted: Sun Jan 14, 2018 5:29 am 
First Gear
Joined: Wed Oct 16, 2002 9:04 pm
Posts: 121
Location: Michigan's Upper Peninsula
All codes are two digits. Long dashes represent the tens, then the short dashes represent the ones. Code 22 would be long flash, long flash, short flash, short flash then repeat. Hope that makes sense. Did you happen to pressure wash the engine bay prior to throwing the check engine light? It's documented that water tends to pool on top of the block in the space where the knock sensor is attached, partially submersing it, which has been noted to lead to early failure of the sensor.

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1991 Legacy SS 5-Speed

1999 Impreza 2.5RS Coupe


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 Post subject: Re: 1993 Legacy, diagnostic code questions
PostPosted: Sun Jan 14, 2018 7:17 am 
First Gear
Joined: Mon Apr 16, 2007 12:55 am
Posts: 89
Location: Near Seattle wa
No to washing.


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 Post subject: Re: 1993 Legacy, diagnostic code questions
PostPosted: Wed Jan 17, 2018 6:24 am 
Fifth Gear
Joined: Fri May 04, 2007 4:09 pm
Posts: 2262
Location: N. ID
regardless...the code is 22. BUT that is the 'stored code'. Read the above link to get the ACTIVE/current codes.

...and grab a 12mm socket, long extender and remove the KS and check for cracks and/or wiring issues....the wiring also fails on these oldies - where they connect to the harness.

And Why are you checking? Is the CEL on??? Car running poorly??

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Turbo Subies:
'87 GL-10 Turbo 4WD Wagon (pre-Loyale) - SOLD
'90 BJ, EJ22T/DOHC and 5-speed swap - SOLD
'04 FXT, Forged internals, VF39, STI TMIC, Cobb AP- SOLD
'93 Legacy SS - 5-speed, SOLD :-(
'02 WRX GG-SOLD
'96 BD - turbo'd-SOLD


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 Post subject: Re: 1993 Legacy, diagnostic code questions
PostPosted: Thu Jan 25, 2018 7:33 am 
First Gear
Joined: Mon Apr 16, 2007 12:55 am
Posts: 89
Location: Near Seattle wa
CEL is on and wife says it goes out when pushing hard on the accelerator going up a hill on the freeway.
There are signs of mouse or squirrel debris on the engine and under the intake manifold, blew a lot of it out.
Engine had a miss plugs pretty much fixed that, CEL still on though.


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 Post subject: Re: 1993 Legacy, diagnostic code questions
PostPosted: Tue May 01, 2018 3:29 am 
First Gear
Joined: Mon Apr 16, 2007 12:55 am
Posts: 89
Location: Near Seattle wa
Okay think this is finally resolved, ECT was bad, and just found a nice mouse chewed knock sensor wire, found other wires chewed on too but to fix would be likely pulling the intake manifold, so hope that lasts. And yes replaced the knock sensor.


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 Post subject: Re: 1993 Legacy, diagnostic code questions
PostPosted: Tue May 01, 2018 5:42 pm 
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Location: Houston, Tx
Thanks for the follow up!

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Josh

surrealmirage.com/subaru
1990 Legacy (AWD, 6MT, & EJ22T Swap)
1997 Impreza OBS

If you need to get a hold of me please email me rather then pm


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