Suzuki GSR600 Service Manual page 221

4-68 FI SYSTEM DIAGNOSIS
 STP sensor input voltage: 4.5 – 5.5 V
 09900-25008: Multi-circuit tester set
 Tester knob indication: Voltage ()
Is the voltage OK?
YES Go to Step 2.
• Loose or poor contacts on the ECM coupler
(terminal A or S)
NO
• Open or short circuit in the R wire or B/Br wire
Step 1 (When indicating P1654-H:)
1) Turn the ignition switch to OFF.
2) Lift and support the fuel tank. (5-3)
3) Remove the air cleaner box and lift up the throttle body.
(5-13)
4) Check the STP sensor coupler for loose or poor contacts.
If OK, then check the STP sensor lead wire continuity.
5) Disconnect the STP sensor coupler.
6) Check the continuity between Y/W wire B and R wire A.
If the sound is not heard from the tester, the circuit condition
is OK.
7) Disconnect the ECM coupler.
8) Check the continuity between Y/W wire B and terminal J.
9) Also, check the continuity between B/Br wire C and terminal
S.
 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.
(4-26)
(+ R – - Ground)
(+ R – - B/Br)
1
1
1
1
ECM couplers (Harness side)
V