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System Description
NHEC0333
NOTE:
If DTC P1447 is displayed with P0510, perform trouble diagnosis for DTC P0510 first. (See EC-438.)
SEF323U
In this evaporative emission (EVAP) control system, purge flow occurs during non-closed throttle conditions.
Purge volume is related to air intake volume. Under normal purge conditions (non-closed throttle), the EVAP
canister purge volume control solenoid valve is open to admit purge flow. Purge flow exposes the EVAP con-
trol system pressure sensor to intake manifold vacuum.
On Board Diagnosis Logic
NHEC0334
Under normal conditions (non-closed throttle), sensor output volt-
age indicates if pressure drop and purge flow are adequate. If not,
a fault is determined.
Malfunction is detected when EVAP control system does not oper-
ate properly, EVAP control system has a leak between intake mani-
fold and EVAP control system pressure sensor.
Possible Cause
NHEC0590
I EVAP canister purge volume control solenoid valve stuck
closed
I EVAP control system pressure sensor and the circuit
I Loose, disconnected or improper connection of rubber tube
I Blocked rubber tube
I Cracked EVAP canister
I EVAP canister purge volume control solenoid valve circuit
I Closed throttle position switch
I Blocked purge port
I EVAP canister vent control valve
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P1447 EVAPORATIVE EMISSION (EVAP) CONTROL SYSTEM PURGE
FLOW MONITORING
System Description
EC-553
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