Variable Valve Timing (VVT) System Operation

If VVT system circuits or components are faulty, a Diagnostic Trouble Code (DTC) should set. Retrieve DTCs and perform appropriate diagnostic test. See appropriate SELF-DIAGNOSTICS article. For testing GS300, seeDTC P1346: VARIABLE VALVE TIMING (VVT) CIRCUIT RANGE PERFORMANCE/FAULT and DTC P1349: VARIABLE VALVE TIMING (VVT) SYSTEM MALFUNCTION in SELF-DIAGNOSIS - GS300 article. For testing GS430, see DTC P1345 OR P1350: VARIABLE VALVE TIMING (VVT) CIRCUIT MALFUNCTION , DTC P1346 OR P1351: VARIABLE VALVE TIMING (VVT) and DTC P1349 OR P1354: VARIABLE VALVE TIMING (VVT) in SELF-DIAGNOSIS - GS430 article. For testing IS300, see DTC P1346: VARIABLE VALVE TIMING (VVT) CIRCUIT RANGE/PERFORMANCE FAULT and DTC P1349: VARIABLE VALVE TIMING (VVT) SYSTEM MALFUNCTION in SELF-DIAGNOSIS - IS300 article. For testing LS430, see DTC P1345 OR DTC P1350: VARIABLE VALVE TIMING (VVT) CIRCUIT MALFUNCTION , DTC P1346 OR DTC P1351: VARIABLE VALVE TIMING (VVT) and DTC P1349 OR DTC P1354: VARIABLE VALVE TIMING (VVT) in SELF-DIAGNOSIS - LS430 article. For testing SC430, see DTC P1345 OR DTC P1350: VARIABLE VALVE TIMING CIRCUIT MALFUNCTION , DTC P1346 OR DTC P1351: VARIABLE VALVE TIMING (VVT) and DTC P1349 OR DTC P1354: VARIABLE VALVE TIMING (VVT) in SELF-DIAGNOSIS - SC430 article.