Suzuki TU250X Service Manual page 172

Step 1 (When indicating P1651-L:)
1) Turn the ignition switch OFF.
2) Check the TO sensor coupler for loose or poor contacts.
If OK, then check the TO sensor lead wire continuity.
3) Disconnect the TO sensor coupler.
4) Check the continuity between Br wire B and ground.
5) Also, check the continuity between Br wire B and B/Br wire
C. If the sound is not heard from the tester, the circuit condi-
tion is OK.
6) Disconnect the ECM coupler.
7) Check the continuity between R wire A and terminal A.
8) Also, then check the continuity between Br wire B and termi-
nal 4.
 TOS lead wire continuity: Continuity ()
 09900-25008: Multi circuit tester set
09900-25009: Needle-point probe set
 Tester knob indication: Continuity test ()
Is the continuity OK?
YES Go to Step 2.
NO R or Br wire open, or Br wire shorted to ground.
FI SYSTEM DIAGNOSIS 4-51
1
1
1
ECM coupler (Harness side)
!