Fuel Gauge and possible speedo issues R3T

[rocketjohn]

I filled the tank several times. The gauge is dead. I rode the bike 100+ miles yesterday, and still dead. I took it to a mechanic yesterday, but he doesn't have the service manual for the Touring model, and the pin diagrams for the instrument plug are different between the Touring and Roadster (he could find the Roadster diagram). Does anyone know where I can find the Touring service manual or electrical diagrams?

You can google search it and get it in PDF format....it's huge and will take an age to print. Better also to use a laser printer for an inkjet would dry up and cry for mercy!

 

[Bedifferent]

You can google search it and get it in PDF format....it's huge and will take an age to print. Better also to use a laser printer for an inkjet would dry up and cry for mercy!

Here is a link to a service manual that has been posted here several times. Download it to your computer for viewing and printing. I did purchase a new manual when I bought my 2015.. but to be honest..very little has changed. I'm posting a picture of the R3T wiring. Connector 28 is the connector for the instrument cluster but beyond that, Triumph does not give any other information about the wiring and each pins function that go to the cluster. I actually asked @DEcosse once upon a time if he had more specific wiring information about the cluster, but he did not. I think I need to try and get in touch with Triumph to see if they would send me specifics. I'm afraid all of this will be very little help other than what I suggested in a previous post.

http://www.piano-person.com/r3docs/Service_Manual_R3S_C_T.pdf

 

[DEcosse]

It will not be an instrument connector issue - the Fuel information is transmitted on the CANBUS data signals, along with Speed, Tach etc.
So any break in that connection would result in NONE of the information working

The problem is going to be either the connection for the Fuel Level Sender, or the Fuel Level Sender itself.

 

[rocketjohn]

I wonder if anyone knows the sample rate of the Rocket computer, and if it is rather slow, could it be that would make recognizing an abrupt change in level such as refueling a slow process? Slow...but normal....absent other problems of course.

 

[Bedifferent]

I have been reading through my service manual and if you have TunECU and a cable you might check the ECU for some codes. According to the manual the check engine light "does not" come on for the following codes..

P0460...Fuel,level sensor circuit malfunction
P0656...Fuel gauge circuit malfunction
P1610...Low fuel output circuit malfunction.

Also, connector 18 is the fuel level sensor connector to the ECU on the Rocket Touring diagram I posted earlier.

Just trying to be of help

 

[TURBO200R4]

I wonder if anyone knows the sample rate of the Rocket computer, and if it is rather slow, could it be that would make recognizing an abrupt change in level such as refueling a slow process? Slow...but normal....absent other problems of course.

my GUESS would be that the ecu only monitors the fuel level above a certain speed because a lot of guys said it started to work after they rode a while.

 

[Bedifferent]

FYI. I can speak from my own experience owning two R3Ts. When I fill my tank up I have just a little over 2 miles to get home. I travel 55-60 home and by the time I get home the gauge is reading close to full. The miles I have left on the tank reading is close, but not quite yet accurate. If I go riding the next day, after having shutoff the engine the night before, the fuel gauge will continue to correct itself and climb to the actual full reading after several miles of riding. The number of miles left on the tank reading will continue to correct itself over time as well. It usually goes higher as I ride.

DEcosse made a good point. Since you have raised the tank, you need to check the wire connection going to the fuel sensor on the bottom of the tank. Both the sensor connection and the tank sensor are highly suspect.

Tank level sender...T1241194.... $130.00

 

[DEcosse]

I would believe the reason is does not update immediately is because it is averaging over a number of readings;
so when you first fill up, even though the tank is full, the majority of readings prior are low; so it is closer to that pre-fill number
As you go further, the earlier readings drop off and the new become more dominant.
That explains why it is not a step change but gradual.

 

[R3Rx118]

Hi guys, reading some threads regarding fuel gauges and have a few questions/issues. I've got a 2015 roadster, and have already had the dealership install a new sending unit in the tank but I can't figure this out. The new one isn't any better than the original one. The light, gas pump, comes on well before I'm close to empty and the linear gauge reads down to a couple lines after that. I think I'm close to empty, but according to my miles I've only rode around 125 miles, give or take 10-15 miles. Then I go to fill up and I can only but in 3-3 1/2 gallons. What's going on with the fuel gauge? Are they just this inaccurate or what? I was told some bs at the dealership that it has to 'learn' and if that's true am I just supposed to ride it and hope I don't run out of gas?

 

[TURBO200R4]

that is the way they work. i suppose they don't want the fuel pump to not have gas around it to keep it cool. i usually fill mine up at 120 miles
i would think that one could adjust the float very careful by bending the float rod. but if u pull the assy be careful not to bend going back in.