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Discussion Starter #1
REPOSTING this here for more visability had it posted on troubleshooting forum.

Been slowly working on getting my cbr 600rr back to running conditions after sitting for couple years.

The fan isnt turning activating once it reaches 220F, I have swapped out the relays to see if that could be the issue, bike still turns on when swapping the fuel pump relay and fan relay. The fan fuse visibly is fine, swapped with a spare just incase.

I have grounded the wire at the ECM and fan spins, also grounded under the fuse box and in both instances it spins.

I have removed thermostat and tested it using the manual procedure, it opens and closes fine.

The temps displays fine on the gauge.

Was hoping someone here has delt with similar issue and can help me solve this problem. I was going to just place the fan on a switch but decided not to since it would just be masking whatever issue is causing it not to activate during operation.

I have burp the system as well as i could possibly do it to remove any air, in my opinion gone above and beyond what the manual instructs to get whatever possible air bubbles out. Coolant has been flushed, over 6 times with distilled water.


I am also taking any shop recommendations in the houston area, if i cant solve this myself might just need to take it to one.

Thanks in advance.
 

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CBRCHRIS
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108 Posts
Use a multi meter and test voltage output from ecm the circuit opens and sends out voltage at around 220 degrees, if no output voltage detected check the them temp sensor readings a failing temp sensor can send the wrong readings to the ecm so use the multi meter on the temp sensor and convert the readings to what voltage the ecm sees as temperature readings. example if the sensor sends 0.3 volts to the ecm the ecm May read that voltage as 200 degrees and so fourth
 

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BOTY 2014 Winner
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The ecu doesn't "send" any voltage to turn the fan on. It controls the negative side of the coil on the relay.


If the temp sensor was bad the dash wouldn't display the correct temp.
 

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If the temp sensor was bad the dash wouldn't display the correct temp.
hey, question on that? Is it the same sensor? I ask because many, if not most cars have separate sensors for temp. one for the ECU and one for the gauge.

if the coolant temp sensor that turns on the fan is bad, it won't turn on the fan.
 
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