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Perfect PCIII install

75K views 290 replies 139 participants last post by  Roldas  
#1 ·
Updated 8-04-06

This install covers ALL years of Warriors to date.

If your Warrior cuts out, has dead spots, a wacky throttle response off idle or a dyno tuner that goes nuts trying to get you a good custom map follow these instructions. It will fix 99% of these issues unless you have a broken CPS.


Many people have experienced that the PCIII setup as described in its manual is not perfect. The TPS read out in particular is a problem. Instead of a steady TPS signal the PCIII (regular and USB) jumps around pretty wild. This causes not only shops to do custom maps to take a lot longer to get it right but can also lead to less than perfect throttle response of your Warrior.

The solution is very simple and is highly recommended for EVERY Warrior PCIII owner.

IMPORTANT: When looking for the right wires please make sure that the first color is the base color and the second on is the strip on it. So black/blue for example is a black wire with a blue strip.

Start with the gray PCIII TPS hookup wire: Pull it back through the insulation to have it come out pretty close of the PCIII. Depending on where you install the PCIII you only need a few inches of gray wire. Check first before you cut it too short.
Now locate the solid yellow wire that runs into the ECU. Be aware that there are several wires that have a least part yellow marking on them. There is only one solid yellow wire (it might have some gold markers on it as all the wires).
Cut that wire, take the insulation off both ends, twist the gray wire around one of those ends, push a piece of shrink tubing over the other yellow end and solder the connection back together. Last but not least push the shrink tubing back over the solder joint and heat shrink it.
The second connection that is even more important is the PCIII digital ground. The Warrior uses a digital ground wire for all its sensors to reduce noise. The PCIII comes with a digital ground wire but unfortunately as it is sold it is connected to regular ground. When you pull back the insulation of the PCIII ground wire you will find two wires ending at the ground connector: One is black (regular ground) and the other one is black/white (digital ground). Cut the black/white wire and pull it back to the same exit you used to run the gray wire. The black/white wire will need to be approximately the same length as the gray wire. Now find the black/blue wire that runs into the ECU. There is only one.
Do the same thing as before but now splice the black/white (PCIII) wire into the black/blue (ECU) wire and heat shrink the solder joint.
Install the PCIII in its final location and you are done.

Now when you hookup a laptop of dyno computer to the PCIII the TPS signal on a running Warrior should be rock steady and the bike should run cleaner and very crisp. If not you might adjust the map you are currently running.

Hope this helps!

Oliver
 
#103 ·
Interesting story, I completed the perfect install. I had a problem that came and went with a engine code 38 - Decompression soleniod. I finaly had to take the bike to the dealer (who sold me the PCIII) and they said I created the problem and didn't want to honor the extended warranty.

After a call to Yamaha, they determined that it was the decompression soleniod (duh!) and worked up quote to repair the bike. The warranty company is going to pay for the work.

So, I have no clue if the mod works better or not. We'll see how the dealer deals with it when they repair the soleniod.

But thanks for help on the instructions, couldn't have done it without it. Oh by the way, the dealer was the one who told me to intall the PCII.

Big_Dog[8D]
 
#109 ·
I just did mine this morning. I had a rough idle with some minor sputtering and hesitation that would cause first gear starts to be a bit rough. It was nothing more than a minor annoyance that I figured was just the way it was supposed to be. After stumbling on this thread and reading about some of the benefits I thought it would be worth a try but didn't really think it would fix the problem and that it would be a good thing to do anyway. Well I was more than pleasantly surprised to find the idle to be perfectly smooth immediately after doing the mod. It's great to have something work out that way. Thanksto Frankenstein and JP for the pics.
 
#111 ·
Ok, I understand the digital ground instructions and reasons why from the perfect PCIII install.

Have a question; is the Yellow wire the same Yellow wire used to change the ECU settings when you ground it? Or do I have the wrong wire? Also, why make this part of the mod? is it to get the PCIII connection close to the ECU or the TPS? Not questioning if I should do the mod, just would like to know why I am doing it.
 
#112 ·
quote:Originally posted by E-man

Ok, I understand the digital ground instructions and reasons why from the perfect PCIII install.

Have a question; is the Yellow wire the same Yellow wire used to change the ECU settings when you ground it? Or do I have the wrong wire? Also, why make this part of the mod? is it to get the PCIII connection close to the ECU or the TPS? Not questioning if I should do the mod, just would like to know why I am doing it.




No, yellow wire is not the same.You want to splice into the solid yellow wire.
The ECU wire is yellow with orange stripe.#27
Instructions for pc3 says to t-tap into tps.Soldering is a much better way to make a conn.
 
#113 ·
Rigth about the soldering. The big difference of the Perfect PCIII install compared to how they recommend the install is that it splits PCIII's digital ground from regular ground. The ECU uses a digital ground for its sensors to keep the sensor signals 'clean'. Hooking it up that way ensures best possitble TPS read by the PCIII.
 
#114 ·
Am with you(s) on the soldering (no T taps) and the change for the Digital ground...

Would like to know - why change the installation of the Grey wire from the PCIII with the Yellow wire of the ECU? Is it to get the signal closer to the ECU (RedHorse's Pics...Thanx) or to just make a better soldered type connection?

By connecting the wire close to the ECU, do I bypass a piece of electronics that I do not use/need with the PCIII, or am I making a more reliable connection (solder) with shorter wire lengths to the ECU?
 
#117 ·
I'm still trying to figure out where you guys got all that extra wire to make the connections. I didnt have room to do anything, had to splice extra wire and make extra connection to get them together.

Lucky me, I got one they must have spliced the grey wire inside the harness, could not pull the wire back through, it broke about 6 inches from where I cut to pull. Ground wire came right out. This 20 minute install had me pullin my hair out after 4 hrs[/emoticons/emotion-6.gif!]

I used a battery and downloaded the map for V&H big'uns with stock air before the install. I'll have to take my computer to the basement for the throttle set. I hit the switch and she fired up[/emoticons/emotion-1.gif] I took it for a spin around the block and it seemed just fine. Does this mean I must have it hooked up correctly? If a connection was bad would it still run? Thanks for the help and the pics JP and Frankx[/emoticons/emotion-2.gif][|)]
 
#119 ·
It was dark and cold last night so I didnt get to really run it through its paces. Now its cold and windy this morning, guess it will have to wait till I get home this weekend. I didnt notice any problems, seemed to be smoother and not quite as loud (less rattle)[?] Anyway, how critical is the trottle reset[?]

I think its great rswarrior keeps this thread open and the "Godfather of Mods" checks it and keeps it updated[/emoticons/emotion-2.gif] Just saw you a few minutes ago on SPEED, again[/emoticons/emotion-5.gif][|)]
 
#122 ·
I want to say thanks for the great instructions.Went easier than I had imagined it would.The most significant improvement that I gained is the loss of the occasional stall when coming to a stop or slowing for a turn.Hasn't happened since the perfect install.And throttle response seems to be a little crisper,quicker,like my engine is more willing to do what I ask of it.One thing I did to gain a little more room to work was to remove the wires from the plug before trying to make the splices,then when done just plugged them back in.
 
#124 ·
I finished the install last night, while I had it apart, I installed my SS Throttle and Clutch cables, they were a bigger pain than the PCIII, wires were really short though, I just soddered jumpers onto the "nubs" and that worked out the best, I definitely need a bike jack, that is next along with my Speedstar 2 into 1 which will go on this weekend, along with my spiegler SS brake lines. Then I think I'll take a little mod brake
 
#126 ·
At least they think people buying the Widebandcommander are competent enough to do this mod themselves.

quote:Stable TPS Readings

Proper grounding is essential to ensure a stable TPS reading. If you have noticed that your TPS reading is a bit “jumpy” with the throttle closed, it's most likely caused by a poor ground. To get the best possible TPS reading on the Wide Band Commander, connect the black / white ground wire to the TPS ground and the black heater ground wire to the engine or battery cable.