Suzuki GSX-R750 Service Manual page 193

.
Is the voltage OK?
• G/W or O/BI wire open or shorted to ground.
• Loose or poor contacts on the CKP sensor cou-
pler or ECM coupler (terminal D or U).
• If wire and connection are OK, intermittent trou-
YES ble or faulty ECM.
• Recheck each terminal and wire harness for
open circuit and poor connection.
• Replace the ECM with a known good one, and
inspect it again.
• Inspect that metal particles or foreign material
stuck on the CKP sensor and rotor tip.
NO • If there are no metal particles and foreign mate-
rial, then replace the CKP sensor with a new
one.

When using the multi-circuit tester, do not storongly
touch the terminal of the ECM coupler with a needle
pointed tester probe to prevent the terminal damage
or terminal bend.
3) After repairing the trouble, clear the DTC using SDS tool.
(4-27)
FI SYSTEM DIAGNOSIS
2
ECM couplers (Harness side)
(Black)
4-37
(Gray)