Suzuki GSX-R750 Service Manual page 250

4-94 FI SYSTEM DIAGNOSIS
Step 1 (When indicating P1658:)
1) Turn the ignition switch OFF.
2) Remove the frame cover. (5-8)
3) Check the EXCVA motor coupler for loose or poor contacts.
Is the contacting OK?
YES Go to Step 6.
Loose or poor contacts on the EXCV motor cou-
NO
pler
4) After repairing the trouble, clear the DTC using SDS tool.
(4-27)
Step 2
1) Turn the ignition switch OFF.
2) Check the installation of EXCV cables. (6-7)
If it is necessary, adjust the EXCV cables. (6-7)
3) Disconnect the EXCVA position sensor lead wire coupler.
4) Turn the ignition switch ON.
5) Measure the voltage between the R wire terminal 1 and
ground.
6) If OK, then measure the voltage between the R wire
terminal 1 and B/Br wire terminal 2.
 Position 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 3.
• 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
7) After repairing the trouble, clear the DTC using SDS tool.
(4-27)
(+ R – - Ground)
(+ R – - B/Br)
1
2
2
2
V