xp1000 fan not working
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So your fan is not coming on when you feel it should be? What is the engine temp running at? The fan should be pwm controlled meaning it is supplied with power and ground and a signal wire which commands it to a certain speed based on the ecm calibrated temp range or in this case a fault condition. Let’s say your machine ecm is still stock. The fan should start around 205 degrees and ramp to full speed when it hits the high point, for instance 260 degrees (dont quote me on this setting). So if your temp doesn’t reach that minimum set point during these colder months, the fan shouldn’t come on. If the engine temp on your cluster is showing higher than 205 with no fan it seems as there might be an issue with the ect sensor. I say this because you already performed the last step here and disconnected the ect harness and the fan took off. Check for dirty terminals on the ect sensor and retest.
IMO all of your wiring is good because when the ect sensor is unplugged the ecm commands the fan to a predetermined speed based on a faulty sensor. Also the temp sensor must be reading some sort of resistance within spec if the fan does not engage when the harness is connected. Perhaps you could hit the engine with a laser temp gun to verify what the dash says is close to what the thermal gun reads. Might not be 100% spot on but should be close enough.
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IMO all of your wiring is good because when the ect sensor is unplugged the ecm commands the fan to a predetermined speed based on a faulty sensor. Also the temp sensor must be reading some sort of resistance within spec if the fan does not engage when the harness is connected. Perhaps you could hit the engine with a laser temp gun to verify what the dash says is close to what the thermal gun reads. Might not be 100% spot on but should be close enough.
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If you unplug the sensor and everything works like it should, it would seem that the sensor is the thing to replace. You could measure the resistance to be sure, but it's obviously not a fuse or relay issue if it kicks on when the sensor is unplugged.
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