Help, please! Engine overheating 🥵

Nashvegas said:

I have an ongoing problem with my 22GT. I have taken it to two different dealerships and they have not been able to diagnose the issue. Relays are good, continuity is good and the fan motors are good. When I get into traffic I know to switch over to the temp reading because if it goes a half bar above about 50% it will throw a check engine code. If I look at the fans they are usually stopped. They will sometimes kick on for a few weak revolutions and then stop again. I shut the bike down, wait a minute or so and restart. Sometimes the fans kick on, sometimes they don’t. Rinse & repeat. They never seem to kick into high mode. When the traffic clears, the temp goes back to normal, so I think the thermostat is fine. After a few cycles of no traffic the check engine fault goes off. Until next time…. Grrr…

So, after looking at the downloadable repair manual/coolant system I found that it has a PWM Controller. This regulates fan speed. Hmm… Computers use them and you may have heard your fan when it kicks into high mode. So, I ordered one this afternoon. Maybe that’s the issue or maybe not but I think I am on the right track. Thoughts? My issue now, don’t even go there is that I can’t find how the replace the PWM Controller in the searchable database. Remove the cowling? Remove the radiator? Help! Please.

Click to expand...

TURBO200R4 said:

going to guess
PWN (pulse width modulated controller) would be the voltage or ground needed to come to the fan motor to make it run as fast as the ecu wants it to run
again guessing
if you put 12 volts on the fan motor it would be at max siting if running about 13.7 volts.
what is the code number it is giving?
i have not been dealing with the new r3 and this seems like a problem not many are going to know about.
good luck
check water level

Click to expand...

Nashvegas said:

I have an ongoing problem with my 22GT. I have taken it to two different dealerships and they have not been able to diagnose the issue. Relays are good, continuity is good and the fan motors are good. When I get into traffic I know to switch over to the temp reading because if it goes a half bar above about 50% it will throw a check engine code. If I look at the fans they are usually stopped. They will sometimes kick on for a few weak revolutions and then stop again. I shut the bike down, wait a minute or so and restart. Sometimes the fans kick on, sometimes they don’t. Rinse & repeat. They never seem to kick into high mode. When the traffic clears, the temp goes back to normal, so I think the thermostat is fine. After a few cycles of no traffic the check engine fault goes off. Until next time…. Grrr…

So, after looking at the downloadable repair manual/coolant system I found that it has a PWM Controller. This regulates fan speed. Hmm… Computers use them and you may have heard your fan when it kicks into high mode. So, I ordered one this afternoon. Maybe that’s the issue or maybe not but I think I am on the right track. Thoughts? My issue now, don’t even go there is that I can’t find how the replace the PWM Controller in the searchable database. Remove the cowling? Remove the radiator? Help! Please.

Click to expand...

sunny said:

The ECU processes the temperature data from temperature sensor and determines whether the cooling fan needs to be activated. When the coolant temperature exceeds a certain threshold, the ECU sends a signal to the PWM fan controller. The PWM fan controller receives the signal from the ECU. The cooling fan, controlled by the PWM signal,





Stock tune or custom?


Use this circuit diagram from Triumph for our bikes to diagnose the cooling system

Click to expand...

Jagster said:

I'm very interested to find out more about this subject.

Last year when I concluded that my intermittent LCD display fault only occurred when the engine got really hot, I did wonder if the cooling fans were working as they should.
The problem for me, is that when the LCD display dies on me, I can't see the temperature gauge, but I know that before the display dies, the temp reading is high.
I'm not getting any error codes and my dealer has scanned for any data logged on the bike, but found nothing, so at the moment i'm in limbo about getting a fix for my problem.

It only becomes a problem when i'm stationary in traffic and the ambient temp is over, say, 71F. I can then really feel the heat from the engine. As soon as i'm feeling that level of heat, the display begins to die, and once it's completely blacked out, it doesn't come on again until the bike has cooled down and been switched off and restarted.

Could it be that I have the same kind of fault on the fans??

Click to expand...

Nashvegas said:

Penner/Custom tune. It ran fine 6-8 months after the tune. I think the ECU is telling it to go because sometimes it will do a couple of very weak revolutions and then stop. If I turn the bike off and then back on it will usually start spinning but not always on the first try and then they never seem to kick into high-speed.

Click to expand...