Suzuki GSX-R750 Service Manual page 252

4-96 FI SYSTEM DIAGNOSIS
Step 4
1) Turn the ignition switch OFF.
2) Connect the position sensor coupler.
3) Measure the position sensor output voltage at fully close posi-
tion and fully open position.
4) Insert the needle pointed probes to the back side of the posi-
tion sensor lead wire coupler. (+ Y – - B/Br)
5) Disconnect the EXCVA motor lead wire coupler 2.
6) To set the EXCV to fully close position, apply 12 V to A and
B terminals.
Positive wire – A (P wire) terminal
Negative wire – B (Gr wire) terminal
7) Turn the ignition switch ON.
8) Measure the position sensor output voltage at fully close posi-
tion.
9) Then, to set the EXCV to fully open position, apply 12 V to B
and A terminals.
Positive wire – B (Gr wire) terminal
Negative wire – A (P wire) terminal
10)Measure the position sensor output voltage at fully open
position.
 Position sensor output voltage
EXCV is fully close: 0.5 – 1.3 V
EXCV is fully open: 3.7 – 4.5 V
 09900-25008: Multi circuit tester set
09900-25009: Needle pointed probe set
 Tester knob indication: Voltage ()
Is the voltage OK?
Replace the ECM with a known good one, and
YES
inspect it again.
NO Go to Step 5.
11)After repairing the trouble, clear the DTC using SDS tool.
(4-27)
(+ Y – - W)
4
12 V
4
4
12 V
V