Quote:
Originally Posted by
Macca2801
You can test the temp sender without a diagnostic tool and just use a multimeter (if you have one)
Measure the resistance at the sensor pins while the bike is cold and at around 20degC the resistance should be 2280-2630ohms and evenly change down to 138-145ohms at 110degC.
That will give you a good idea of the temp, ie pop clip and measure when cold, then connect sender and idle bike till fan kicks in. Soon as it kicks in, kill bike pop clip and measure again. If you temp gauge is correct and the fan is kicking in at 109deg C then the sensor should be reading 140ish.
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You really need to remove the sensor in order to check it with a multimeter to get any degree of accuracy or useful data. Using a guesstimate of cold/hot engine and comparing the readings with a top hose temperature reading just isn't going to be accurate enough. The sensor resistance needs to be checked/compared with temperature at/or in very close proximity to it. The temp on any top hose reading gauge will lag considerably from that of the actual engine temp sensor; it will also be affected by operation of the thermostat, whereas the engine temp sensor reads before the thermostat and reacts quickly to cylinder head temperature.