Code 52 still after changing both KS's????
 

Hi all,

Noob here and sorry if this is a dumb question. I've searched for KS related stuff and read a lot of info. But I'm still a bit lost.

I'm working on my moms 87turbo/auto. The dealership said it needed KS's so she ordered 2 of them. I just got done installing them and its still throwing code 52. I had the pos bat cable off and the EFI fuse out while I installed the new parts. When I finished up, started it and its still running like crap and throwing code 52.

Any ideas for me???

Thanks in advance!

Brandon

i think when you put a new KS in you have to reset the computer...

what is a ks?

KS= Knock Sensor

Alot of times, the code 52 is from the KS wiring, and not from the KS itself. Usually rewiring the 2 KS on a Turbo Supra (or 1 on a N/A) will correct the problem. Here is the step-by-step rewire page, and here is a thread in this forum discussing the rewire.

And make sure you have that negative battery cable disconnected or you pull the 15 amp EFI fuse out for a few minutes to erase the code from the computer.

I was under the impression that pulling the EFI fuse did reset it? The engine light was out for a few minutes and then came back on.


KS= Knock sensor

Pulling the EFI fuse cuts the power to the computer, and after a few minutes the computer no longer has a residual charge, thus clearing its memory of stored codes.

Thanks for the response!

What goes wrong with the factory wiring that we need to rewire the KS?

Well, it's a 87. So all the wiring on the car is about 23 years old.... After countless hot/cold cycles, the wires become brittle, insulation wears away.... The time is just rough for wiring, so it needs to get replaced.

Ok, I have now rewired the KS's. It sounded better on start up with a bit of a miss at idle. I let it warm up to opperating temp, hit the gas a few times and no CEL! I'm thinking I'm golden.....take it for a quick drive and it feels like its running on 2 cyl. but still no CEL.

Are the plugs shot after after it got driven in limp mode for 40 miles from my folks house to mine?

I'm done for tonight just looking for advice on where to start on it tomorrow.

Thanks once again!

I'd probably start checking your plugs, wires, and timing (in that order) next. It's possible that your plugs could have been fouled, and the ECU running rich while in limp mode might have fouled them more. Also these cars are notorious for leaking oil into the plug valley, so you may have oil soaked plugs/wires.

When you check your timing, be sure to check your valve timing before you check your ignition timing.

Thanks again for the responses!!

Yes when they brought it over #5 and 6 plug holes where full of oil. I sucked it out with my brake bleeder then pulled the plugs and brake cleaned the holes out. I pulled all the cam cover bolts(all loose) and sprayed brake clean through the bolt holes and re-installed with locktite(blue). I did put 2 new plugs in.

I will put in 6 new plugs in next.

Are the plug wires shot after being soaked with oil? I cleaned them well but I know oil can break down and soak into rubber...maybe still shorting out a bit?? Just want to ask before I spend any more of their money....they already got soaked for $199 EACH for the KS's!

Yeah, it is definitely possible that oil soaked wires can cause them to break down and start shorting out.

You may want to find a reasonably priced set of OEM style plug wires at an auto parts store if you're worried about spending too much money... That way you can swap the cheapo's in, test drive it, and if it still doesn't work there's not that much money out of pocket.

Well I ran it buy my dad and he wants to stay with genuine Toyota parts, so the wires are ordered. So Mr. Wilson thanks for all your help.....I wont bug you for awhile.....at least until late next week when the parts show up!

Thanks again for all your help!

Code 52 but all ok
 

Hi all, so what if u have a code 52 but everything seems to b fine. Runs good, sounds good. Thanks!

damn edit button..

reset your code bank
could be an old stored code.

Ks layman's terms
 

So for someone who is new to all this, can you explain a little what exactly a ks does. Any other items I should look for. Cleared bank, same 52 came back. Does knock mean a literal sound you can hear or is this a term for internal firing, etc? Thanks

The ks sense knock caused from to much timing it will the hear the knock or pinging and adjust the ignition timing accordingly. you changed the KS but did you do the re wire job?? I did mine a couple of days ago and it fixed the problem with out new knock sensor its very common on the supras. check the link out

http://www.supras.com/06/techcenter/display.php?QID=69

this forum is awesome. i have learned everything i know about my car from u guys. i felt i needed to join to say thank you to everyone who takes the time to answer these questions.