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:

    Checking the relays
    Check each switch for continuity with the pocket tester. If the continuity reading is incorrect, replace the relay. 1. Disconnect the relay from the wire harness. 2. Connect the pocket tester ( × 1) and battery (12 V) to the relay terminal as shown. Check the relay operation. Out ...

    Handlebar switches
    Left Left 1. Pass switch "PASS" 2. Dimmer switch "/" 3. Turn signal switch "/" 4. Horn switch"" Right Right Engine stop switch "/" Start switch"" Pass switch "PASS" Press this switch to flash the headlight. Dimmer switch "/" Set this switch to"" for the high beam an ...

    Checking the primary drive gear
    1. Remove: Primary drive gear Refer to "BALANCER GEAR" on page 5-53. 2. Check: Primary drive gear Damage/wear  Replace the primary drive gear and clutch housing as a set. Excessive noise during operation Replace the primary drive gear and clutch housing as a set ...

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