Hi all, I am new to the site, had a WR250R now for nearly a year and really enjoying it
I need some help with an electrical problem with the cooling fan, not long ago it wouldn’t come on and the engine was boiling so I eventually diagnosed the problem to a corroded terminal in the relay, I cleaned it and put loads of Vaseline around it, ran a check on the ECU 51 (fan relay) and it activated 5 times as it should – great I thought.
Next time out riding, every time the fan comes on so does the ENGINE WARNING LIGHT, fan goes off, amber warning light off. Another problem it didn’t have before is that when the engine is off/ignition on, the fan wont run, as soon as engine started again, fan runs along with the warning light.
I have cleaned the GREEN overheat sensor, played with the ECM but no difference, anyone gotta an idea??
PROBLEM – FAN TURNS ON WHEN ENGINE IS WARM (as normal) BUT THE ECU AMBER LIGHT COMES ON AT THE SAME TIME AND WHEN THE ENGINE IS CUT THE FAN STOPS EVEN WITH IGNITION ON.
Today I managed to spend some time working on the bike –
Battery terminals good
Cleaned the relay
Battery is reading 12.5v
Temp sensor – I think that has to be working as the fan comes on along with the ECU light when the engine warms up so I haven’t made a separate test on it.
The earths seem fine
Swapped the headlight relay for the fan relay and vice versa – both relays work ok in lights and both throw up same ECU light on with fan.
Disconnected the battery and held + and – together to discharge the capacitors (cold reset)-THIS THEN BROUGHT UP ERROR CODE 21 iso OF 0, but after subsequent running of fan it displays a 0 error code
·21---Coolant temperature sensor, open or short circuit detected.
·Open or short circuit in wire harness. Defective coolant temperature sensor. Fault detected in ECU
