Question about 2005 Honda CBR 125 R
I have a honda CBR 2004 model.. and the temperature gauge seems to increase to red even on the smallest of journeys. i know that the gauge is not broken so im wondering if its the thermostat, or pump.. im not sure what to do about it. does anybody know what could be the problem?
On my cbr i had a problem w/ the cooling fan. so check to make sure it works. then your going to need to see if the radiator hoses are both warm, if not it needs a thermostat. the water pump is expensive and not likely to break. but, it is possible. my bike needed a thermoswitch, which turns the rad. fan on and off.
Posted on Feb 12, 2009
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Posted on Jan 02, 2017
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Cooling Fan Switch
Engine Temperature Sensor
Fig. Remove the coolant temperature sensor
The coolant temperature gauge sensor is a temperature-variable resistor, or thermistor. As coolant temperature increases, the resistance of the sensor decreases or decreases, depending on the type of sensor.
A1 and A2 platforms use a different type of circuit that A3 vehicles. On A1 and A2 vehicles, the circuit is a "resistance to ground" type. A3 vehicles use a "variable voltage" type, where a voltage is supplied to the sensor. Because of the circuitry design on A3 vehicles, testing of the coolant temperature gauge is limited.
The engine coolant temperature gauge uses a heat sensitive sending unit to transmit an electrical signal to the gauge. The sending unit is a heat sensitive variable resistor that is located on or near to the cylinder head and threads into an engine coolant passage. The sensors are a Negative Temperature Coefficient (NTC) type. As the temperature increases, the electrical resistance of the sensor decreases. As the coolant temperature changes, so does the resistance of the sensor. The gauge is calibrated within the operating range of the sensor and interprets the resistance value to display the coolant temperature.
Beginning with model year 1994, the engine coolant gauge and the Engine Control Module (ECM) temperature sensors were combined into one sensor with 4 terminals. The basic operation remains the same in that their resistance decreases as the coolant temperature increases, however the actual resistance values of the 2 sensor circuits are different. The electrical connector of the 4-wire terminal sensor ( 1 and 2 ) is keyed to prevent improper connection of the sensor's electrical circuit.
Fig. The electrical connector for the combined temperature sensors is keyed to avoid improperly connecting the sensor's wiring-1997 2.8L V6 connector shown
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