Suzuki GSX-R750 Service Manual page 190

4-34 FI SYSTEM DIAGNOSIS
6) Under this condition, if a suitable screwdriver touching the
pick-up surface of the CMP sensor is moved, the tester read-
ing voltage changes (0.8 V and less ↔ 4.3 V and more).
.
Is the voltage OK?
• B/Y, B/Br or R wire open or shorted to ground
• Loose or poor contacts on the CKP sensor cou-
pler or ECM coupler (terminal C, S or A)
• If wires and connection are OK, intermittent
YES trouble 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 CMP sensor and rotor tip.
NO • If there are no metal particles and foreign mate-
rial, then replace the CMP 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.
7) After repairing the trouble, clear the DTC using SDS tool.
(4-27)
ECM couplers (Harness side)
(Black) (Gray)