I AM PUTTING THIS HERE BECAUSE YOU
MAY WANT TO DO THIS STUFF BEFORE YOU SEND ME YOUR ECU...
(This will save you time when your ECU arrives so you will be "Plug
in and go")
It doesn't matter "when" you do this as
long as it's done before you start using the bike.
I SUGGEST THAT YOU READ THIS IN DETAIL SO YOU CAN UNDERSTAND WHY IT NEEDS
TO BE DONE !!
YOUR ECU'S PART # IS LISTED ON IT AS SHOWN IN THE PHOTOS BELOW:
THE REASON THAT YOU MUST DO THIS IS BECAUSE THESE SETTINGS CANNOT
BE ACCESSED BY ME.
THEY CAN ONLY BE ACCESSED AND CHANGED THROUGH THE DASHBOARD ON YOUR BIKE.
("Co" values are stored in the ECU.... Not the dashboard, but
cannot accessed through reprogramming)
For all 3C3 ECU's (2006-2010)
3C3-30 - 2006
3C3-40 - 2007
3C3-41 - 2007
3C3-50 - 2008
3C3-60 - 2009
3C3-70 - 2010
Yamaha was making ECU fueling adjustments each year during this time
period and made adjustments to this bike's "Co" settings until
If you don't do these steps, your bike will run rich or lean after I flash
your ECU depending on what the "Co" values are on each cylinder.
Performance, driveability and fuel mileage will suffer.
Before installing your newly reprogrammed ECU, the very first thing that
needs to be done is enable access to the "Co" mode.
This is simply to remove a wire in your tip-over sensor connector and ground
it so you can access these settings, and make them all "0"
This procedure only takes about 5 minutes after you access and ground the
above mentioned wire.
You can do this before or after you send the ECU to me as long as it's done
before you ride your bike.
(Instructions for this are shown below)
For 3C3-80 ECU (USA and Canada
"Co" settings are set to "0" from the factory, however
if you are not the original owner of the 3C3-80 ECU that you are using,
then it is necessary to do this as well to make sure that they are in fact
set to "0" because someone may have changed them.
TO ENABLE "Co" MODE ON ALL USA
& CANADA MODELS 2006-2015
1) Unplug the connector from TIP-OVER SENSOR.
2) Lift the "pin lock latch" and remove the light green wire from
Attach a length of wire and connect it to any good ground (battery negative
or frame works well)
This will allow access to the Co settings whenever it is grounded.
(You may choose to leave it permanently attached to ground)
3) Re-connect and re-install the sensor - the bike won't run without it.
See instructions & photos below
Wire to be accessed is in the tipover sensor connector.
The tip-over sensor is located between the rider
and passenger seat.
Remove tool kit, then remove the 2 allen screws holding
sensor in place, lift the connector release latch and unplug it.
Temporarily set the sensor to the side.
The wire to be removed from the connector is light
green as shown above.
Next you will need to GENTLY depress the "pin latch" away from
the terminal with a sewing needle or mechanic's pick.
Then GENTLY slide the light green wire out of the back of the connector.
Either permanently or temporarily attach the wire to ground on the bike
so you can access the CO mode
(permanently would be so you can access these settings at any time)
Reconnect the connector
to the tip-over sensor, and reinstall the sensor !!
CHANGING THE "Co" SETTINGS
1) First press both dash buttons and hold
Then turn the ignition key on while keeping both buttons depressed.
Hold the buttons until "d1" is shown on dash.
(This takes about 5-10 seconds)
2) Then press the left button once and release it
will be displayed.
At this point, I would encourage you to write down
the settings for each cylinder before you change them....
just in case you ever may want to return to stock (requires stock ecu flash
to use the stock Co settings)
3) Press both buttons simultaneously again
until "Co1" is displayed and release the buttons.
4) There are 4 "Co" values (1 for each cylinder) Co1, Co2, Co3,
(You can toggle to each of them using the left or right buttons at this
5) Press both buttons again and hold until the CO value is displayed
then use either the left or right button to make the value "0".
6) Press both buttons again and release to return to the Co cylinder selection
and go to the next cylinder.
a) Do this for all 4 "Co" cylinder values and make them all "0"
b) When they are all set to "0", turn ignition key to the off
5) You can leave the light green wire grounded permanently if desired.
TPS instructions - SEE ALL PHOTOS BELOW !!
TPS Voltage - (measured in DC voltage) TPS = Throttle
TPS check/adjustment must be done before you re-install
1) Idle speed MUST be set before TPS measurement/adjustment !!
2) Idle speed should not be set lower than 1250 - 1300 rpm at operating
temperature - If it is less, then adjust it higher !!
Do not try
to adjust idle speed unless engine is at operating temperature !!
TPS voltage is measured at the solid yellow wire & black/blue wire in
the ECU's SMALL connector.
Slide a small drill bit, or sewing needle alongside the wire and
push it deep into the connector until it contacts the terminal inside...
Yellow will be the + voltage.
The negative from the voltmeter will go to the black/blue wire.
Voltage should be 0.665 volts with engine running at normal operating temperature
170 degrees, and idle speed set between 1250 & 1300 rpm.
(There is no substitute for using a voltmeter such
as the "Diag" mode... use a voltmeter !!)
If it is not 0.665 volts, loosen screws on sensor and adjust it to be this
If voltage is higher than 0.665 volts, fuel mileage & driveability will
be affected negatively.
Do not try to adjust idle speed unless engine is at
operating temperature !!
speed adjuster location:
TPS location and adjustment
These are the TPS
screws that need to be loosened to make adjustments
- Screws are T25 security torx
The upper screw is accessed
from the top - as shown in the TOP TPS photo
(airbox must be removed)
Lower screw is accessed under the frame
as shown in below photo:
Loosen TPS screws
and adjust voltage to be 0.665 volts
T25 security torx.
Voltage is measured
at the SMALL ecu connector between the solid yellow wire (+ lead) and
black w/blue stripe (- lead)
Slide a small drill bit, or sewing
needle alongside the wire and push it deep into the connector until
it contacts the terminal inside...
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