Fan not kicking on at 221f + as it should

[rtwpaul]

I decided against chopping the wire harness just yet and do some wire/ connector testing first

What I did was test the neg. at the connector with the battery key off to get me 13.4 V so I know the connector ground is good

I then tested all of these 13 wires in four different ways at the relay (with it connected)




What I was looking for (hopefully) was a very low voltage or 0, then above 221f when running or off but with the ignition on (cause the fan runs when the bike is on if the heat is over 221f) at least 12 V or more, the chart shows what I found...zero matches



The ones with the * I was hoping would switch from low to high...nope, except blue/ red and that's the fuel pump

So I'm going to surmise from this list that I can't control the fan tapping into one of these because none of them goes from low voltage to high voltage, so they must be a power r for the thermosensor, and that acts as the switch/ trigger for the fan once the temp reaches 221f+

Would you agree with my thinking or am I headed in the wrong direction? Cause next up is removing the fuel rail (again) and tapping into the thermosensor leads?

After this, I'm completely dumbfounded, and it looks like Yamaha is too, cause they suggest 'change ECM' (I think I would add a manual fan switch before I did this)

...and a little more additional info, my ECM is flashed, and I have tried it in 'S' and T mode it does the same thing

 

[Jlq1969]

Ecm flashed?……then you would have to check that the fan on temperature, in the ecm memory, is 221F

 

[WJBertrand]

Might be worth re-flashing the ECU. Maybe settings / firmware associated with fan control got corrupted somehow?


Sent from my iPhone using Tapatalk Pro

 

[Squibb]

Perhaps it's me, but I'm getting lost here, chasing ghosts.

If you remove the relay & use a jumper lead, at least you will know whether the fan is capable of running correctly.

No fan when power applied at the relay will lead you to search downstream of the relay - wiring, connectors or the fan itself. Fan on, leads you to the relay itself, then upstream to the ECU & the temp sensor. TBH, I can't imagine the reflash would have interfered with the coolant fan temp settings materially, rather it would more likely play around with the incoming ambient air temp measurement.

Then the general rules - assume nothing is good ........... oh & make sure you have a new battery in your multimeter.

 

[NJGreg]

As Squibb says, run a new temp hot wire form the relay to the fan and try that. If you hear the relay clicking then it "should" be doing its job of sending power to the fan andmaybe narrow down your search field through the harness.

 

[rtwpaul]

Resolved...

I place a lot of the error on the main yamaha dealer in phoenix, I called and asked for a replacement relay initially, they were out of stock but they gave me the part number to source it somewhere else.

They gave me an alternate relay part #, the correct number is 5JJ-81950-20-00 for the fan relay

I based everything I was doing on the part number and then working thru the FSM from there, wrongly of course. Luckily someone on ADVrider spotted it was the incorrect relay and pointed me back in the right direction before I pulled the ECM out for testing...all good now, I have a working fan again, and new replacement relay on the way from RMATVMC