Suzuki GSX-R750 Service Manual page 159

Step
1 6) Disconnect the ECM coupler. Refer to "ECM Removal
and Installation in Section 1C (Page 1C-1)".
7) Check the continuity between the Y/W wire and terminal
"18". Also, check the continuity between the R wire and
terminal "7".
Special tool
(A): 09900–25008 (Multi-circuit tester set)
(B): 09900–25009 (Needle pointed probe set)
Tester knob indication
Continuity test (
ECM couplers (Harness side)
(B)
Is the continuity OK?
2 1) Connect the ECM coupler.
2) Turn the ignition switch ON.
3) Measure the input voltage between the R wire and
ground. Also, measure the input voltage between the R
wire and B/Br wire.
Special tool
(A): 09900–25008 (Multi-circuit tester set)
Tester knob indication
Voltage ( )
STP sensor input voltage
4.5 – 5.5 V
((+) terminal: R – (–) terminal: Ground, (+) terminal: R
– (–) terminal: B/Br)
Is the voltage OK?
Action
)
?
(A)
"7"
"18"
(Black) (Gray)
V
Engine General Information and Diagnosis:
Yes
Go to Step 2.
I837H1110065-01
Go to Step 3.
(A)
I823H1110069-05
1A-87
No
R or Y/W wire open, or
Y/W wire shorted to
ground.
Open or short circuit in
the R or B/Br wire.