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On Board Diagnosis Logic NHEC1126 DTC No. Trouble diagnosis name DTC Detecting Condition Possible Cause P1491 Vacuum cut valve Vacuum cut valve bypass valve does not operate I Vacuum cut valve bypass valve I Vacuum cut valve I Bypass hoses for clogging I EVAP control system pressure sensor I EVAP canister vent control valve I Hose between fuel tank and vacuum I Hose between vacuum cut valve and I EVAP canister I EVAP purge port of fuel tank for clog- SEF210Y SEF211Y SEF239Y DTC Confirmation Procedure NHEC1127 CAUTION: Always drive vehicle at a safe speed. WITH CONSULT-II NHEC1127S01 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 10 seconds. 4) Start engine and let it idle for at least 70 seconds. 5) Select “VC CUT/V BP/V P1491” of “EVAPORATIVE SYSTEM” 6) Touch “START”. 7) When the following conditions are met, “TESTING” will be dis- ENG SPEED Idle speed or more Selector lever Suitable position Vehicle speed 35 - 120 km/h (22 - 75 MPH) or more B/FUEL SCHDL 1.3 - 8.1 msec If “TESTING” is not displayed after 5 minutes, retry from 8) Make sure that “OK” is displayed after touching “SELF-DIAG GI MA EM LC FE AT AX SU BR ST RS BT HA SC EL IDX DTC P1491 VACUUM CUT VALVE BYPASS VALVE On Board Diagnosis Logic EC-601 |