Suzuki 125 Service Manual page 67

66 RV125K7 ('07-MODEL)
Step 1 (When indicating P1651-H:)
1) Turn the ignition switch OFF.
2) Remove the right frame cover.
3) Check the TO sensor coupler 1 for loose or poor contacts.
If OK, then check the TO sensor lead wire continuity.
4) Disconnect the TO sensor coupler.
5) Check the continuity between R wire A and Br/W wire B.
If the sound is not heard from the tester, the circuit condition is
OK.
6) Disconnect the ECM coupler.
7) Check the continuity between Br/W wire B and terminal A.
8) Also, check the continuity between B/Br wire C and terminal 4.
 TO sensor lead wire continuity: Continuity ()
 09900-25008: Multi-circuit tester set
09900-25009: Needle pointed probe set
 Tester knob indication: Continuity test ()

When using the multi-circuit tester, do not strongly
touch the terminal of the ECM coupler with a needle
pointed tester probe to prevent the terminal damage
or terminal bend.
Is the continuity OK?
YES Go to Step 2.
NO Br/W wire shorted to VCC, or B/Br wire open.
9) After repairing the trouble, clear the DTC using SDS tool.
(Page 40)
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ECM coupler (Harness side)