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On Board Diagnosis Logic
NGEC0398
DTC No. Malfunction is detected when ... Check Items (Possible Cause)
P1491 Vacuum cut valve bypass valve does not operate properly. 쐌 Vacuum cut valve bypass valve
쐌 Vacuum cut valve
쐌 Bypass hoses for clogging
쐌 EVAP control system pressure sensor
쐌 EVAP canister vent control valve
쐌 Hose between fuel tank and vacuum cut valve
clogged
쐌 Hose between vacuum cut valve and EVAP can-
ister clogged
쐌 EVAP canister
쐌 EVAP purge port of fuel tank for clogging
SEF210Y
SEF211Y
SEF239Y
DTC Confirmation Procedure
NGEC0399
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If “DTC Confirmation Procedure” has been previously conducted,
always turn ignition switch “OFF” and wait at least 5 seconds
before conducting the next test.
TESTING CONDITION:
쐌 Always perform test at a temperature of 5 to 30°C (41 to
86°F).
쐌 This test may be conducted with the drive wheels lifted in
the shop or by driving the vehicle. If a road test is
expected to be easier, it is unnecessary to lift the vehicle.
쐌 Before performing the following procedure, confirm that
battery voltage is more than 11V at idle.
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 60 seconds.
5) Select “VC CUT/V BP/V P1491” of “EVAPORATIVE SYSTEM”
in “DTC WORK SUPPORT” mode with CONSULT-II.
6) Touch “START”.
7) When the following conditions are met, “TESTING” will be dis-
played on the CONSULT-II screen. Maintain the conditions
continuously until “TESTING” changes to “COMPLETED”. (It
will take at least 30 seconds.)
ENG SPEED More than 1,000 rpm
Selector lever Suitable position
Vehicle speed 36 - 120 km/h (22 - 75 MPH)
B/FUEL SCHDL Less than 10 msec
DTC P1491 VACUUM CUT VALVE BYPASS VALVE
KA24DE
On Board Diagnosis Logic
EC-538
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