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DIY AEM F/IC Harness Resistor Mod
For this DIY I actually included pics! lol. Actually the pics make it much more helpful since we'll be splicing/wiring 4 wires on a Boomslang harness.
Parts: Boomslang harness for F/IC Soldering Iron (2) 2.2k ohm 1/2 watt resistors Razor blade Electrical tape This mod is very easy. The trickiest part is stripping the wires. And some of you may ask, "if I don't have stuttering issues, can I do this anyway?" Yes you can! It won't hurt anything if you do the mod. So here we go.. Here's what the Boomslang harness looks like. We'll be soldering on the side where it plugs to the F/IC (black connectors). Notice there are two connectors - one is 24 pin and other is 22pin. https://i47.photobucket.com/albums/f...MG_1244_sm.jpg Here's the resistors you need. $0.99 for a pack of 5 - good deal! lol https://i47.photobucket.com/albums/f...MG_1246_sm.jpg Here's the pic comparison of the supplied F/IC harness (not used) vs the Boomslang (right side). We're looking at the 24pin. We'll be messing with the wires on the 9 and 10 pinouts. https://i47.photobucket.com/albums/f...MG_1249_sm.jpg Here's the other 22pin connector. We'll be messing with pinouts 8 and 19. https://i47.photobucket.com/albums/f...MG_1251_sm.jpg Pic of the two resistors needed - and my trusty blade. https://i47.photobucket.com/albums/f...MG_1252_sm.jpg These next two pics show how the wires were carefully stripped with the razor blade. Take your time on this. Wires of pin 9 and 10 (Cam1 + / -) https://i47.photobucket.com/albums/f...MG_1253_sm.jpg Wires of pin 8 and 19 (Crnk1 + / -) https://i47.photobucket.com/albums/f...MG_1254_sm.jpg You now want to tin the bare wires. This means you want a coat of solder on the wires. Here's how they look: https://i47.photobucket.com/albums/f...MG_1256_sm.jpg Next you want to take the resistor and wrap the ends on each wire... and snip off the excess. Then solder the connection. https://i47.photobucket.com/albums/f...MG_1258_sm.jpg https://i47.photobucket.com/albums/f...MG_1259_sm.jpg Now all you need to do is wrap this up with electrical tape and you're done! https://i47.photobucket.com/albums/f...MG_1260_sm.jpg This was a pretty quick mod. |
love the electrical tape........hahaha......
nice write up mang.......your on fire this week |
oh btw that single wire thats loose on the boomslang harness is your logging wire....take it to a switch and run a wire from the switch to a ground....viola...lol
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Ya I know - but that's only for the internal logging right? I rather just log to PC.
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yeah internal logging, but hey you dont have to carry around a laptop.
btw do you have to rub it in :no: ......i dont have my laptop yet :P |
Ohh hhaha. Get one on ebay for cheap, mang!
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i really want that acer mini laptop its like 350 or something....just havnt had that kinda cash just laying around.
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And by doing this what does it change exactly?
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This was intended for those who have the stuttering issue in higher rpms with the F/IC. It's happened on several TCs regardless of year. However, even if you don't have the issue, the mod won't negatively affect your tune.
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well apparently the fic emits a frequency that screws with the cam and crank signals from the sensors.........this suppresses the unwanted "noise" so to speak.
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i'll be the dumb person to ask this... whats this mod do anyways???
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oh and it keeps the cel from comeing on for crank/cam sensor malfunction
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whats happening is the VEHICLE creates a small amount of noise on the crank/cam sensor signal wiring - the fic interprets this as a timing pulse and outputs an additional timing pulse throwing the cars timing out of whack
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ok that works too......lol
i keep hearing it had to do with the fic emitting a frequency...didnt know it was the car...my bad |
nice DIY
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Originally Posted by thendawg
whats happening is the VEHICLE creates a small amount of noise on the crank/cam sensor signal wiring - the fic interprets this as a timing pulse and outputs an additional timing pulse throwing the cars timing out of whack
Thanks for clearing that up...ive been trying to figure out what could be causing noise that ppl were talking about Nice writeup B_real......glad to know if I every do this mod, I already have all the tools/parts needed thanks to school!, :P |
nice diy!
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Sorry if this is a threadjack but this is the most detailed thread I have seen on this on SL but Is this mod only for "noise" in the wires?
If the harness was getting noise, wouldnt you want to "shield" the wires since noise is like an interference, sort of like what could happen when you cross power wires with speaker wires when hooking up an amp... I see how the resistors could help with the voltage fluctuations in resisting to 2.2K ohms tho, just looking for more details to this mod. and Excuse me if I sound like an idiot, im still learning this in school lol which is also why I want to learn more about this particular mod... |
Caveman,
From AEM's website:
Originally Posted by AEM FORUMS
We have seen a couple of vehicles, including an automatic Scion xB, that had erratic misfires (especially at high load) that would go away if you bypassed the cam or crank signals so they were not intercepted by the FIC. After measuring the signals with an oscilloscope, we could see that the signals were a bit noisy, and the FIC inputs were sensitive enough that they picked up noise and sent an extra cam pulse to the ECU. The solution was to install a 2k ohm resistor with one side connected to Crank MAGI(+) and the other side connected to Crank MAGI(-). Another 2k resistor installed with one side connected to Cam1 MAGI(+) and the other side connected to Cam1 MAGI(-).
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DUDE YES!!!
great write up exactly what i needed this will hopfully help get rid of these tedious misfires. |
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