Suzuki VZ800 Service Manual page 217

5-60 FI SYSTEM
Step 1 (When indicating P1654-H:)
1) Remove the fuel tank. (6-3)
2) Turn the ignition switch OFF.
3) Check the STP sensor coupler for loose or poor contacts.
If OK, then check the STP sensor lead wire continuity.
4) Disconnect the STP sensor coupler.
5) Check the continuity between Y/W wire C and Red wire A.
If the sound is not heard from the tester, the circuit condition is
OK.
6) Remove the right frame cover. (8-4)
7) Remove the ECM bracket (5-38) and disconnect the
ECM coupler.
8) Check the continuity between Y/W wire C and terminal 4.
9) Also, check the continuity between B/Br wire B and terminal D.
 STPS lead wire continuity: Continuity ()
 09900-25008: Multi-circuit tester set
09900-25009: Needle pointed probe set
 Tester knob indication: Continuity test ()
Is the continuity OK?
YES Go to Step 2.
NO Y/W wire shorted to VCC, or B/Br wire open
10)After repairing the trouble, clear the DTC using SDS tool.
(5-25)
1
1
1
ECM coupler (Harness side)
!