Yamaha YZF-R125 Service Manual: Checking the lean angle sensor

1. Remove:

  • Lean angle sensor

2. Check:

Lean angle sensor output voltage Out of specification Replace.


a. Connect the lean angle sensor to the wire harness.

b. Connect the pocket tester (DC 20 V) to the lean angle sensor coupler as shown.


Positive tester probe
yellow/green "1"

Negative tester probe
gray/black "2"

Checking the lean angle sensor


c. Set the main switch to "ON".

d. Tilt the lean angle sensor to 65.

e. Measure the lean angle sensor output voltage.

    Checking the crankshaft position sensor
    1. Disconnect: Crankshaft position sensor coupler (from the wire harness) 2. Check: Crankshaft position sensor resistance Out of specification  Replace the crankshaft position senso ...

    Checking the starter motor operation
    1. Check: Starter motor operation Does not operate → Perform the electric starting system troubleshooting, starting with step 4. Refer to "TROUBLESHOOTING" on page 8-9. a. Con ...

    Other materials:

    Intake air pressure sensor
    1. Check: Intake air pressure sensor output voltage Out of specification Replace the throttle body. a. Connect the pocket tester (DC 20 V) to the throttle body sensor assembly coupler as shown. Positive tester probe pink/white "1" Negative tester probe gray/black "2" ...

    Checking the front wheel
    1. Check: Front wheel axle Roll the wheel axle on a flat surface. Bends → Replace. WARNINGDo not attempt to straighten a bent wheel axle. 2. Check: Tire Front wheel Damage/wear → Replace. Refer to "CHECKING THE TIRES" on page 3-23 and "CHECKING TH ...

    Checking the friction plates
    The following procedure applies to all of the friction plates. 1. Check: Friction plate Damage/wear Replace the friction plates as a set. 2. Measure: Friction plate thickness Out of specification Replace the friction plates as a set. NOTE: Measure the friction plate ...

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