Yamaha YZF-R125 Service Manual: Checking the coolant temperature sensor

Yamaha YZF-R125 Service Manual / Electrical system / Electrical components / Checking the coolant temperature sensor

1. Remove:

  • Coolant temperature sensor
WARNING
  • Handle the coolant temperature sensor with special care.
  • Never subject the coolant temperature sensor to strong shocks. If the coolant temperature sensor is dropped, replace it.

2. Check:

  • Coolant temperature sensor resistance Out of specification →Replace.

a. Connect the pocket tester ( ×
100) to the coolant temperature sensor terminals as shown.


  • b. Immerse the coolant temperature sensor "1" in a container filled with coolant "2".

NOTE:

Make sure the coolant temperature sensor terminals do not get wet.

c. Place a thermometer "3" in the coolant.

Checking the coolant temperature sensor


d. Slowly heat the coolant, and then let it cool down to the specified temperature.

e. Check the coolant temperature sensor resistance.

3. Install:

  • Coolant temperature sensor

    Checking the radiator fan motor
    1. Check: Radiator fan motor Faulty/rough movement → Replace. a. Disconnect the radiator fan motor coupler from the wire harness. b. Connect the battery (DC 12 V) as shown. Posi ...

    Checking the throttle body sensor assembly
    WARNING Do not remove the throttle body sensor assembly. Handle the throttle body sensor assembly with special care Never subject the throttle body sensor assembly to strong ...

    Other materials:

    Bearings and oil seals
    Install bearings "1" and oil seals "2" so that the manufacturer's marks or numbers are visible. When installing oil seals "1", lubricate the oil seal lips with a light coat of lithium-soap-based grease. Oil bearings liberally when installing, if appropriate. CAUTION:Do not spin th ...

    Parking
    When parking, stop the engine, and then remove the key from the main switch. WARNING Since the engine and exhaust system can become very hot, park in a place where pedestrians or children are not likely to touch them and be burned. Do not park on a slope or on soft ground, ...

    Removing the fuel tank
    1. Extract the fuel in the fuel tank through the fuel tank filler hole with a pump. 2. Remove: Fuel hose connector cover "1" 3. Disconnect: Fuel hose "2" CAUTION: Be sure to disconnect the fuel hose by hand. Do not forcefully disconnect the hose with tools. A ...

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