Power Commander 3 throttle position help

[southgate]

So just put the baffle in the Leo Vince can on my RR8 Fireblade, and uploaded a suitable map for the setup.

Whilst checking the map had correctly gone over to the PC3, I noticed that whilst idling (idle hunting a bit between 1190 to 1250rpm) the PC3 software on my laptop was saying the throttle position was at 38%. Obviously idling I wasn't touching the throttle!

So now I go into the software > power cammander tools > set throttle position. I set the closed throttle value for what is being shown as the current value with bike idling, and sure enough the software reads 0%. I enter the value at full throttle for the 100% box and click ok, but get a warning that the range is smaller than recommended..... Am I doing something wrong?

Bike doesn't seem to run much different to before I made the adjustments.

[Hooli]

You had let it warm up hadn't you? Not that it'd use anything like 38% for fast idle but still....

On my bike the TPS is adjustable to match figures in the workshop manual, I wonder if your's is out hence the high reading?

[southgate]

Hi Hooli, yes bike was thoroughly warmed up before throttle calibration.

Starting to think I may have a dodgey TPS or throttle bodies are out??

Basically, following the power commander instructions (as I understand it), it gives me a wide band between closed and open, but the screen is telling me the bike is at 38% throttle when idling (now it actually says 60%!).

If adjust the values manually to get the screen sayning 0% throttle at idle, the band from 0 to 100% looks really narrow and flags up a warning message. Not sure where to go from here? Maybe strip tank off and test voltages from TPS, if I can find some guide values that is..

[Hooli]

Dunno then. The nearest I've ever done with mine was the PC3 showed 3% throttle at idle so I corrected that.

I'd expect a faulty TPS to show up in how the bike rides n runs, mine sure did when I had a faulty one.

[southgate]

Anyone got any ideas how to tackle this. Something I haven't thought of?

Do I bite the bullet and change the TPS sensor? Running out of ideas and don't want to be without bike as weather getting nicer

[bass gt3]

If you have access to a digital voltmeter, measure to voltage present on the PC3 TPS pickup. If the bike is idling with the throttle closed, it should be very low, around the 1vdc mark. If it's reading higher, then it's possible the TPS is poked.
If you can monitor the voltage as you open the throttle, it should sweep cleanly from sub 1vdc to about 4.5vdc. If not, replace the TPS.
If the TPS proves to be ok, it's more than likely the PC3. Try updating the firmware on the unit and the software on your computer.
Try that and come back.....

[southgate]

Cheers for that Bass. Yep, got a digital multimeter, will check tomorrow lunch time and report back.

[southgate]

I'm 99% sure this little sucker is the TPS sensor:



It's measuring a constant 4.95v at 0% throttle, bike running or just ignition on. Doesn't seem to change when throttle is opened.

Have I just answered my own question? Something else I've overlooked or cocked up? Bike doesn't seem to be running particularly rough...

[bass gt3]

southgate said:

I'm 99% sure this little sucker is the TPS sensor:



It's measuring a constant 4.95v at 0% throttle, bike running or just ignition on. Doesn't seem to change when throttle is opened.

Have I just answered my own question? Something else I've overlooked or cocked up? Bike doesn't seem to be running particularly rough...

You can't measure with the plug disconnected! You're probably reading the 5vdc feed from the ECU.
You need to put the +ve lead in the PC3 TPS wire while it's connected to the bike, and the -ve to a chassis ground or battery -ve.
With the ignition on but the bike not running, twist the throttle and you should see the voltage rise as the throttle is opened

[southgate]

bass gt3 said:

You can't measure with the plug disconnected!

Doh! The plug is sealed / weather tight, so do I splice a wire onto it?

Will it work with the PC3 disconected and TPS plugged in standard fashion?

[bass gt3]

southgate said:

bass gt3 said:

You can't measure with the plug disconnected!

Doh! The plug is sealed / weather tight, so do I splice a wire onto it?

Will it work with the PC3 disconected and TPS plugged in standard fashion?

How does the PC3 pickup/connect to the TPS to give the PC3 it's signal?? Put the +ve probe where that connection is made

[southgate]

bass gt3 said:

How does the PC3 pickup/connect to the TPS to give the PC3 it's signal?? Put the +ve probe where that connection is made

It piggybacks (right term?) between the OEM male and female plugs.

I.e. you unplug Honda plug and the PC3 has 2 OEM fitting plugs the join between the TPS and Honda loom.

[bass gt3]

southgate said:

It piggybacks (right term?) between the OEM male and female plugs.

I.e. you unplug Honda plug and the PC3 has 2 OEM fitting plugs the join between the TPS and Honda loom.

Ok, understand.
So you need to get he probe to connect with that wire. You can buy wire splicers or just tease back a bit of the insulation and connect it. Wire splicer would be preferable

[southgate]

Thanks. I have a pack of wire splicers, so will crack on. I was going to plug the TPS back into the Honda part of the loom first, just to discount a fault on the PC3 side... Good idea or not?

[bass gt3]

southgate said:

Thanks. I have a pack of wire splicers, so will crack on. I was going to plug the TPS back into the Honda part of the loom first, just to discount a fault on the PC3 side... Good idea or not?

No, test it as it stands. If you have the PC software open, you can see the %age it thinks the throttle is open compared to your voltage measurement. It'll help determine where the fault lies

[southgate]

Right, some results, although strange.

With ignition on, bike not running, TPS shows 2.9v and PC3 software says 100% throttle (voltage doesn't change when throttle moved)

Bike idling, voltage drops to 2.0v, PC3 software says 60% throttle

Hold throttle to show 3,500rpm on bikes rev counter and voltage now drops to 1.7v, PC3 software says 45% throttle

What do you think?

[southgate]

Just checked with PC3 not attached and showing same trend of voltage dropping with twist of throttle.

Voltage reads higher when ignition on, not running - no change in voltage as throttle opened. When running and idling voltage drops a little, getting lower as throttle opened.

[southgate]

OK, so after some googling, it seems I've been a f***ing donkey and made the mistake of mixing up the MAP and TPS plugs, both same plug and next to each other!

Back to normal service please....

[bass gt3]

was about to ask if you were definitely connected to the TPS

[southgate]

Thanks for taking the time to reply, much appreciated even if it was just me being stupid!