Suzuki GSF650A Service Manual page 152

1A-77 Engine General Information and Diagnosis:
Step
2 1) Turn the ignition switch OFF.
2) Move the throttle body right side. Refer to "Throttle Body
Removal and Installation in Section 1D (Page 1D-10)".
3) Disconnect the STVA lead wire coupler.
4) Check the continuity between each terminal and ground.
Special tool
(A): 09900–25008 (Multi-circuit tester set)
Tester knob indication
Resistance (Ω)
STVA continuity
∞ Ω (Infinity)
(Terminal – Ground)
5) If OK, then measure the STVA resistance (between the
B wire "A" and P wire "B") and (between the G wire "C"
and W/Bl wire "D").
STVA resistance
Approx. 7.0 Ω
(Terminal "A" – Ground "B", Terminal "C" – Ground
"D")
"A"
Is the resistance OK?
Action
(A)
"B"
"C"
"D"
Yes
• W/B, P/W, G and B/
Lg wire open or
shorted to the
ground, or poor 1, 2,
18 and 19
connection.
• If wire and
connection are OK,
intermittent trouble or
faulty ECM.
• Recheck each
terminal and wire
harness for open
circuit and poor
connection.
• Replace the ECM
with a known good
(A)
one, and inspect it
again. Refer to "ECM
Removal and
Installation in Section
1C (Page 1C-1)".
I718H1110192-02
I718H1110193-02
No
• Loose or poor
contacts on the ECM
coupler.
• Replace the STVA
with a new one. Refer
to "STV Actuator
Removal and
Installation in Section
1C (Page 1C-5)".