FI SYSTEM DIAGNOSIS 4-65 “C28” (P1655) 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 STVA ECM B B/Lg STVA. 1B P P/W STVA. 1A G G STVA. 2B W/BI W/B STVA. 2A INSPECTION 1 Step 1 E 1) Lift and support the fuel tank. (5-3) 2) Remove the air cleaner cover. (2-4) L 3)Check the STVA lead wire coupler for loose or poor contacts. P SAM 4) Turn the ignition switch ON to check the STV operation. 1 (STV operating order: Full open → 95% open) Is the operating OK? YES Go to Step 2. • Loose or poor contacts on the STVA coupler NO • 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. 5) After repairing the trouble, clear the DTC using SDS tool. (4-27)