Suzuki FL125S Service Manual page 333

Step 1 (When indicating P0115-L:)
1) Turn the ignition switch OFF.
2) Remove the rear center leg shield. (#5-6)
3) Check the ET sensor coupler 1 for loose or poor contacts.
If OK, then check the ET sensor lead wire continuity.
4) Disconnect the ET sensor coupler.
5) Check the continuity between O/B wire A and ground.
If the sound is not heard from the tester, the circuit condition
is OK.
* Tester knob indication: Continuity test ())
Is the continuity OK?
YES Go to Step 2.
NO • O/B wire shorted to ground
6) After repairing the trouble, clear the DTC using SDS tool.
(#8-39)
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FL125SDW 8-58