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:

    Tachometer
    Tachometer Tachometer Tachometer red zone The electric tachometer allows the rider to monitor the engine speed and keep it within the ideal power range. When the key is turned to "ON", the tachometer needle will sweep once across the r/min range and then return to zero r/min ...

    Checking the starter motor
    1. Check: Commutator Dirt Clean with 600 grit sandpaper. 2. Measure: Commutator diameter "a" Out of specification Replace the starter motor. 3. Measure: Mica undercut "a" Out of specification Scrape the mica to the proper measurement with a hacksaw blade ...

    Checking the fuel sender
    1. Drain the fuel from the fuel tank. 2. Check: Fuel sender resistance Out of specification → Replace the fuel sender. a. Connect the pocket tester ( × 10) to the fuel sender coupler as shown. Positive tester probe sky blue "1" Negative tester probe orange/white " ...

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