Suzuki GSX-R750 Service Manual page 235

Is the voltage OK?
• Gr/W wire open or shorted to ground, or poor h
connection (#1 cylinder side)
• Gr/B wire open or shorted to ground, or poor g
connection (#2 cylinder side)
• Gr/Y wire open or shorted to ground, or poor f
connection (#3 cylinder side)
• Gr/R wire open or shorted to ground, or poor e
YES
connection (#4 cylinder side)
• If wire and connection are OK, intermittent trou-
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.
NO Open circuit in the Y/R wire

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)
4-79
(Gray)