4-64 FI SYSTEM DIAGNOSIS
“C28” (P1655) STV ACTUATOR CIRCUIT MALFUNCTION
INSPECTION
Step 1
1) Lift and support the fuel tank. (5-3)
2) Remove the air cleaner box. (5-13)
3) Check the STVA lead wire coupler for loose or poor contacts.
4) Turn the ignition switch to ON to check the STV operation.
(STV operating order: Full open → 95% open)
Is the operating OK?
5) After repairing the trouble, clear the DTC using SDS tool.
(4-26)
DETECTED CONDITION POSSIBLE CAUSE
The operation voltage does not reach the STVA.
ECM does not receive communication signal from
the STVA.
• STVA malfunction
• STVA circuit open or short
• STVA motor malfunction
ECM
STVA. 2B
STVA. 1A
STVA. 1B
STVA
STVA. 2A
B/Lg
P/W
G
W/B
1
YES Go to Step 2.
NO
• Loose or poor contacts on the STVA coupler
• Open or short circuit in the B/Lg, P/W, W/B or
Green wires
• If wire and connection are OK, go to Step 2.
1
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