Suzuki GSX-R750, Service Manual

Page: 446 / 495

GSX-R750K2 (’02-MODEL) 11-7
INSPECTION
• Lift and support the fuel tank with its prop stay.
• Remove the air cleaner element.
Turn the ignition switch ON and OFF.
Check the STVA lead wire coupler for loose or poor con-
tacts.
Turn the ignition switch ON to check the STVA operation.
(STV operating order: Full close
→
Full open
→
20% open)
No
Loose or poor contacts on
Yes the STVA coupler.
Open or short circuit in the
(Pink or Black) and (W/Bl
or Green) wires.
1
“C28” STV ACTUATOR CIRCUIT MALFUNCTION
DETECTED CONDITION POSSIBLE CAUSE
The operation voltage does not reach the STVA. • STVA malfunction.
ECM does not receive communication signal from • STVA circuit open or short.
the STVA. • STVA motor malfunction.
Turn the ignition switch OFF.
Disconnect the STVA lead wire coupler.
Check the continuity between each wire and ground.
STVA continuity:
∞Ω ∞Ω
∞Ω ∞Ω
∞Ω
(Infinity)
If OK, then measure the STVA resistance. (between Pink
and Black wires) and (between W/B and Green wires)
STVA resistance: Approx. 6.5
Ω Ω Ω Ω Ω
(
+
Pink –
-
Black)
(
+ +
+ + +
W/B –
- -
- - -
Green)
09900-25008: Multi circuit tester
Tester knob indication: Resistance (
Ω Ω
Ω Ω
Ω
)
No
Replace the STVA
with a new one.
Yes
Loose or poor contacts on the STVA coupler.
If wire and connection are OK, intermittent trouble or faulty
ECM. Recheck each terminal and wire harness for open cir-
cuit and poor connection.
Replace the ECM with
new one, and inspect it
again.
2
1
1
2
Ground Ground
2
W