more boost *update

[JoeB]

Paul, is this diagram correct? If not, if you send me the pic, I will post it here. -JoeB



THIS DIAGRAM IS INCORRECT

For the correct diagram and lots of good info, see these 3 pics below. 2 of them are the pinout of the ECU including wire colors and the 3rd is one of the wiring diagrams that shows the knock sensors on the bottom right. You'll see that the diagram listed in the Apexi wiring manual has the knock sensors backwards. Thanks very much to Vampire (Paul) for the info! -JoeB

http://users.adelphia.net/~jbailer/ECU_pinout_1.gif
http://users.adelphia.net/~jbailer/ECU_pinout_2.gif
http://users.adelphia.net/~jbailer/ECU_4_pic.gif

[808Camry]

Joe is right thanks to Paul (Vampire) the Apex-i does have it backwards. I just noticed this now and wanted to post it but Job beat me to it.

[Ragtop George]

So let me see if I have this straight:

-The rear knock sensor (#1, which is closest to the firewall and the supercharger) is the one we want to ignore, so we rewire like this:

-Cut the white wire going to E11-27, and tape off the end of the wire coming from the knock sensor (the end going to the engine)
-Strip the other end of the cut wire, that is the end that goes to the ECM.
-Strip some insulation off the white wire going to E11-28, but do not cut the wire.
-Connect the stripped wires together: attach the stripped end from E11-27 to the stripped area on the wire going to E11-28.

Is this correct?

George

[JoeB]

So let me see if I have this straight:

-The rear knock sensor (#1, which is closest to the firewall and the supercharger) is the one we want to ignore, so we rewire like this:

-Cut the white wire going to E11-27, and tape off the end of the wire coming from the knock sensor (the end going to the engine)
-Strip the other end of the cut wire, that is the end that goes to the ECM.
-Strip some insulation off the white wire going to E11-28, but do not cut the wire.
-Connect the stripped wires together: attach the stripped end from E11-27 to the stripped area on the wire going to E11-28.

Is this correct?

George

George, that is exactly the way I understand it and would expect. Since Bank 1 is closest to the supercharger, that would make sense. However, Ron says he is getting trips on Bank 2. That would be the opposite. Can others chime in which failure you got for the knock sensors? I'd hate to do it backwards. At least you have all the wiring right. Now lets just see which knock sensor we really want to use the signal from. My guess is still Bank 2. -JoeB

[Ragtop George]

I did the above mentioned mod tonight. The insulation on the wires is actually translucent, so the wires look silver. It is tight working in there! I took some pictures, I will see if I can post them at some point. Tomorrow we will see if it makes any difference in driving the car. The weather is warming up, and I can tell the car is getting a bit sluggish, so hopefully this will help.

George

[shidosha01]

I did the above mentioned mod tonight. The insulation on the wires is actually translucent, so the wires look silver. It is tight working in there! I took some pictures, I will see if I can post them at some point. Tomorrow we will see if it makes any difference in driving the car. The weather is warming up, and I can tell the car is getting a bit sluggish, so hopefully this will help.

George

Please keep us posted. Have fun with the test drive.

[808Camry]

Keep in mind this isn't a performance mod. Its a solution for people getting timing retard due to the knock sensor going off.

[shidosha01]

Keep in mind this isn't a performance mod. Its a solution for people getting timing retard due to the knock sensor going off.

Yeah...

And I may be one of them.

[Ragtop George]

Just an update, after driving the car for a couple of days, it is definately snappier, the throttle response is better and the power is up a bit so the timing must not be retarded anymore. So the knock sensor mod is working well for me.

George

[808Camry]

George did you ever get a CEL? If so what did the code read or say was it bank 1 or bank 2 failure?

[Ragtop George]

No, I have never gotten a code from the knock sensors. I have just gotten the retarded timing from #1. I don't know if there is any way of telling for sure if you are getting timing retard, other than to try the mod and see how it works. My clues were that the car would be much slower in warm weather (like 10-15% slower on 0-60) and when I first went to the 6 PSI pulley, the car was fastest just after the change, and then seemed to slow down as time went on.

George

[Ragtop George]

If anyone wants pics of the wiring mod, I can email them to you. Send me an email at:

george@garnetinstruments.com

Or if someone wants to host them, go for it!

George

[808Camry]

Here's the pics from George.
http://www.imagestation.com/mypictures/ ... 4-r1-011-4[1].&album_id=4287335827&from_album=1

http://www.imagestation.com/mypictures/ ... -r1-001-00[1].&album_id=4287335827&from_album=1

http://www.imagestation.com/mypictures/ ... 4-r1-009-3[1].&album_id=4287335827&from_album=1

http://www.imagestation.com/mypictures/ ... aption=Pic 4&album_id=4287335827&from_album=1

http://www.imagestation.com/mypictures/ ... aption=pic 5&album_id=4287335827&from_album=1

[cdssolara]

I think that I'm going to try this mod before attempting to relocate the knock sensors. I recently got an OBDII scan tool that allows me to clear the codes, in addition to reading them. Once I cleared the codes, and then pushed the car until I got a CEL, I noticed that the only code I'm now getting is the knock sensor for bank 1. I had previously seen codes for both bank 1 and bank 2, but maybe the bank 2 code had been in the ECU for a long time, and had simply never been cleared. Anyway, I repeated the test by clearing the code again, and then trying to get another CEL. When it happened, the code again is only for a bank 1 knock sensor malfunction. From the manual that I have, it looks like bank 1 is the rear bank (closest to the firewall), so maybe now all I have to do is make this wiring fix.

[JoeB]

I think that I'm going to try this mod before attempting to relocate the knock sensors. I recently got an OBDII scan tool that allows me to clear the codes, in addition to reading them. Once I cleared the codes, and then pushed the car until I got a CEL, I noticed that the only code I'm now getting is the knock sensor for bank 1. I had previously seen codes for both bank 1 and bank 2, but maybe the bank 2 code had been in the ECU for a long time, and had simply never been cleared. Anyway, I repeated the test by clearing the code again, and then trying to get another CEL. When it happened, the code again is only for a bank 1 knock sensor malfunction. From the manual that I have, it looks like bank 1 is the rear bank (closest to the firewall), so maybe now all I have to do is make this wiring fix.

Carlo, that's great news and in line with what we've discussed. I realy think this will help you (and others). My bet is you can't hear ANY knock either can you? By the way, what OBD-II scanner did you get?

By the way, great pics George and thanks for posting them Ron. -JoeB