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On Board Diagnosis Logic
NFEC1126
DTC No.
Trouble diagnosis
name
DTC Detecting Condition Possible Cause
P1491
1491
Vacuum cut valve
bypass valve
Vacuum cut valve bypass valve does not operate
properly.
I Vacuum cut valve bypass valve
I Vacuum cut valve
I Bypass hoses for clogging
I EVAP control system pressure sensor
and circuit
I EVAP canister vent control valve
I Hose between fuel tank and vacuum
cut valve clogged
I Hose between vacuum cut valve and
EVAP canister clogged
I EVAP canister
I EVAP purge port of fuel tank for clog-
ging
SEF210Y
SEF211Y
SEF239Y
DTC Confirmation Procedure
NFEC1127
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 10 seconds
before conducting the next test.
TESTING CONDITION:
For best results, perform test at a temperature of 5 to 30°C (41
to 86°F).
WITH CONSULT-II
NFEC1127S01
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”
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 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
step 3.
8) Make sure that “OK” is displayed after touching “SELF-DIAG
GI
MA
EM
LC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P1491 VACUUM CUT VALVE BYPASS VALVE
On Board Diagnosis Logic
EC-629
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