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DTC P1491 VACUUM CUT VALVE BYPASS VALVE EC-1111 [VG33E] C D E F G H I J K L M A EC On Board Diagnosis Logic UBS00DPN DTC Confirmation Procedure UBS00DPO CAUTION: Always drive vehicle at a safe speed. °C (41 to 86°F). WITH CONSULT-II 1. Turn ignition switch ON. 2. Start engine and warm it up to normal operating temperature. 3. Turn ignition switch OFF and wait at least 5 seconds. 4. Start engine and let it idle for at least 70 seconds. 5. Select “VC CUT/V BP/V P1491” of “EVAPORATIVE SYSTEM” in “DTC WORK SUPPORT” mode with 6. Touch “START”. 7. When the following conditions are met, “TESTING” will be displayed on the CONSULT-II screen. Maintain If “TESTING” is not displayed after 5 minutes, retry from step 3. 8. Make sure that “OK” is displayed after touching “SELF-DIAG RESULTS”. If “NG” is displayed, refer to . DTC No. Trouble diagnosis name DTC detecting condition Possible cause P1491 Vacuum cut valve Vacuum cut valve bypass valve does ● Vacuum cut valve bypass valve ● Vacuum cut valve ● Bypass hoses for clogging ● EVAP control system pressure sensor and circuit ● EVAP canister vent control valve ● Hose between fuel tank and vacuum cut valve ● Hose between vacuum cut valve and EVAP canister ● EVAP canister ● EVAP purge port of fuel tank for clogging ● Refueling control valve ● Refueling EVAP vapor cut valve CMPS·RPM (POS) More than 500 rpm Selector lever Suitable position Vehicle speed More than 36 km/h (22 MPH) B/FUEL SCHDL 1.0 - 10.0 msec PBIB1462E |