Question about 1998 Honda CBR 900 RR Fireblade
Take the two wire of the fan from the connector block and put a live to one and a negative to the other if it doesn't turn around try and spin the fan with your hand if it still don't spin then the fan is knackered, if it does spin then the live feed from the fan relay/fan switch is missing or the earth is bad.
Posted on Jan 17, 2015
I have a 1998 honda cbr900rr. The bike got over 130 and the fan still didnt turn on. What might be the issuse for this?
Posted on Jan 17, 2015
With the honda cooling fan it is best to remove the wire from the temperature sensor located at the side of the radiator about the size of a 10p piece with a spade type wire fitting. Earth that wire to the bike frame/engine (use additional wire if required) the fan should start immeadiately if it is working correctly. Reason for this is the sensor creates an earth to the radiator when it gets over heated creating a circuit for the live feed and earth via the frame through the radiator temperature switch. (you will have just created this senario by earthing out the wire)
Posted on Feb 22, 2010
The fan wont cut in till the engine is very hot,,, well over 100 degrees near to 120! if you realy wont to test the fan out pull the bike up on its stand and leave it ticking over,,, it should take forever before the fan kicks in,,,my bmw has only ever switched the cooling fan on once in 3 years!!!! and that was after standing with the motor running in a traffic jam for 35 minuets !!! but if you wont to find the temp switch pull the plug off the switch and short the two plug pins out with some wire that will start the fan up,,,watch your fingers,,,you only get 5 free fingers on each hand with each body,, and there are no spare parts going cheep?
Posted on Feb 06, 2010
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Posted on Jan 02, 2017
Tips for a great answer:
The engine coolant temperature sensor provides an input voltage to the PCM. As the coolant temperature varies, the sensor resistance changes resulting in a different input voltage to the PCM.
When the engine is cold, the PCM will demand slightly richer air/fuel mixtures and higher idle speeds until normal operating temperatures are reached.
The engine coolant temperature sensor is also utilized for control of the cooling fan.
Fig. 1: Engine coolant temperature sensor location - 3.3L and 3.8L engines
Check this test procedure:
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