DTC P1442 EVAP CONTROL SYSTEM
EC-529
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EC
DTC P1442 EVAP CONTROL SYSTEM
PFP:14950
On Board Diagnosis Logic
EBS00MKI
NOTE:
If DTC P0442 is displayed with P1448, perform trouble diagnosis for DTC P1448 first. (See
EC-552
.)
This diagnosis detects leaks in the EVAP purge line using vapor pressure in the fuel tank.
The EVAP canister vent control valve is closed to shut the EVAP purge line. The vacuum cut valve bypass
valve will then be opened to clear the line between the fuel tank and the EVAP canister purge volume control
solenoid valve. The EVAP control system pressure sensor can now monitor the pressure inside the fuel tank.
If pressure increases, the ECM will check for leaks in the line between the vacuum cut valve and EVAP canis-
ter purge volume control solenoid valve.
CAUTION:
●
Use only a genuine NISSAN fuel filler cap as a replacement. If an incorrect fuel filler cap is used,
the MIL may come on.
●
If the fuel filler cap is not tightened properly, the MIL may come on.
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P1442
1442
EVAP control system
small leak detected
(positive pressure)
EVAP control system has a leak, EVAP
control system does not operate prop-
erly.
●
Incorrect fuel tank vacuum relief valve
●
Incorrect fuel filler cap used
●
Fuel filler cap remains open or fails to close.
●
Foreign matter caught in fuel filler cap.
●
Leak is in line between intake manifold and
EVAP canister purge volume control solenoid
valve.
●
Foreign matter caught in EVAP canister vent
control valve.
●
EVAP canister or fuel tank leaks
●
EVAP purge line (pipe and rubber tube) leaks
●
EVAP purge line rubber tube bent
●
Blocked or bent rubber tube to EVAP control sys-
tem pressure sensor
●
Loose or disconnected rubber tube
●
EVAP canister vent control valve and the circuit
●
EVAP canister purge volume control solenoid
valve and the circuit
●
Fuel tank temperature sensor
●
O-ring of EVAP canister vent control valve is
missing or damaged
●
Water separator
●
EVAP canister is saturated with water
●
EVAP control system pressure sensor
●
Fuel level sensor and the circuit
●
Refueling control valve
●
ORVR system leaks
SEF323U