Yamaha YZF-R125 Service Manual: Checking the turn signal relay

1. Check:

Turn signal relay input voltage Out of specification →The wiring circuit from the main switch to the turn signal relay coupler is faulty and must be repaired.


a. Connect the pocket tester (DC 20 V) to the turn signal relay terminal as shown.


- Positive tester probe 
brown "1"

- Negative tester probe 
ground


b. Set the main switch to "ON".

c. Measure the turn signal relay input voltage.

2. Check:

Turn signal relay output voltage Out of specification Replace.


a. Connect the pocket tester (DC 20 V) to the turn signal relay terminal as shown.


Positive tester probe 
brown/white "1"

Negative tester probe
ground


b. Set the main switch to "ON".

c. Measure the turn signal relay output voltage.

    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 ( ...

    Checking the diode
    1. Check: Diode Out of specification Replace. NOTE: The pocket tester or the analog pocket tester readings are shown in the following table. a. Disconnect the diode from the wire harness. ...

    Other materials:

    Removing the piston
    1. Remove: Piston pin clips "1" Piston pin "2" Piston "3" CAUTION:Do not use a hammer to drive the piston pin out. NOTE: Before removing the piston pin clip, cover the crankcase opening with a clean rag to prevent the piston pin clip from falling in ...

    Checking the decompression system
    1. Check: Decompression system a. Check the decompression system with the camshaft sprocket and the decompression cam installed to the camshaft. b. Check that the decompression lever "1" moves smoothly. c. Without operating the decompression lever, check that the decompression cam " ...

    Removing the valves
    The following procedure applies to all of the valves and related components. NOTE: Before removing the internal parts of the cylinder head (e.g., valves, valve springs, valve seats), make sure the valves properly seal. 1. Check: Valve sealing Leakage at the valve seat Check the valve ...

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