C28" (P1655) Stv Actuator Circuit Malfunction - Suzuki GSX-R750 Service Manual

"C28" (P1655) STV ACTUATOR CIRCUIT MALFUNCTION

DETECTED CONDITION
The operation voltage does not reach the STVA.
ECM does not receive communication signal from
the STVA.
STVA
INSPECTION
Step 1
1) Lift and support the fuel tank. (5-3)
2) Remove the air cleaner box. (5-14)
3) Check the STVA lead wire coupler for loose or poor contacts.
4) Turn the ignition switch ON to check the STV operation.
(STV operating order: Full open → 95% open)
Is the operating OK?
YES Go to Step 2.
• Loose or poor contacts on the STVA coupler
• Open or short circuit in the B/Lg, P/W, W/B or G
NO
wires
• If wire and connection are OK, go to Step 2.
5) After repairing the trouble, clear the DTC using SDS tool.
(4-27)
• STVA malfunction
• STVA circuit open or short
• STVA motor malfunction
B/Lg
P/W
G
W/B
FI SYSTEM DIAGNOSIS
POSSIBLE CAUSE
ECM
STVA. 1B
STVA. 1A
STVA. 2B
STVA. 2A
1
1
4-67