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Infiniti F50. Manual - part 472

DTC P1442 EVAP CONTROL SYSTEM

EC-529

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

EC-530

DTC P1442 EVAP CONTROL SYSTEM

●

Use only a genuine NISSAN rubber tube as a replacement.

DTC Confirmation Procedure

EBS00MKJ

NOTE:

●

If DTC P0442 is displayed with P1448, perform trouble diagnosis for DTC P1448 first. (See

EC-552

●

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:

●

Perform “DTC WORK SUPPORT” when the fuel level is between 1/4 and 3/4 full and vehicle is
placed on flat level surface.

●

Always perform test at a temperature of 0 to 30

C (32 to 86

F).

WITH CONSULT-II

Turn ignition switch “ON”.

Turn ignition switch “OFF” and wait at least 10 seconds.

Turn ignition switch “ON” and select “DATA MONITOR” mode
with CONSULT-II.

Make sure that the following conditions are met.
COOLAN TEMP/S: 0 - 70

C (32 - 158

INT/A TEMP SE: 0 - 30

C (32 - 86

Select “EVAP SML LEAK P0442/P1442” of “EVAPORATIVE SYSTEM” in “DTC WORK SUPPORT” mode
with CONSULT-II.
Follow the instruction displayed.

NOTE:
If the engine speed cannot be maintained within the range displayed on the CONSULT-II screen, go to

EC-82, "Basic Inspection"

SEF475Y

PBIB0829E

DTC P1442 EVAP CONTROL SYSTEM

EC-531

Make sure that “OK” is displayed.
If “NG” is displayed, refer to

EC-531, "Diagnostic Procedure"

NOTE:
Make sure that EVAP hoses are connected to EVAP canister
purge volume control solenoid valve properly.

WITH GST

NOTE:
Be sure to read the explanation of “Driving Pattern” on

EC-61

before driving vehicle.

Start engine.

Drive vehicle according to “Driving Pattern”,

EC-61

Stop vehicle.

Select “MODE 1” with GST.

–

If SRT of EVAP system is not set yet, go to the following step.

–

If SRT of EVAP system is set, the result will be OK.

Turn ignition switch “OFF” and wait at least 10 seconds.

Start engine.
It is not necessary to cool engine down before driving.

Drive vehicle again according to the “Driving Pattern”,

EC-61

Stop vehicle.

Select “MODE 3” with GST.

–

If P1442 is displayed on the screen, go to

EC-531, "Diagnostic Procedure"

–

If P0441 is displayed on the screen, go to

EC-327, "Diagnostic Procedure"

–

If P0442 is displayed on the screen, go to

EC-332, "Diagnostic Procedure"

–

If P0441, P0442 and P1442 are not displayed on the screen, go to the following step.

10. Select “MODE 1” with GST.

–

If SRT of EVAP system is set, the result will be OK.

–

If SRT of EVAP system is not set, go to step 6.

Diagnostic Procedure

EBS00MKK

CHECK FUEL FILLER CAP DESIGN

Turn ignition switch “OFF”.

Check for genuine NISSAN fuel filler cap design.

OK or NG

>> GO TO 2.

>> Replace with genuine NISSAN fuel filler cap.

SEC763C

SEF915U

EC-532

DTC P1442 EVAP CONTROL SYSTEM

CHECK FUEL FILLER CAP INSTALLATION

Check that the cap is tightened properly by rotating the cap clockwise.

OK or NG

>> GO TO 3.

●

Open fuel filler cap, then clean cap and fuel filler neck threads using air blower.

●

Retighten until ratcheting sound is heard.

CHECK FUEL FILLER CAP FUNCTION

Check for air releasing sound while opening the fuel filler cap.

OK or NG

>> GO TO 5.

>> GO TO 4.

CHECK FUEL TANK VACUUM RELIEF VALVE

Refer to

EC-687, "FUEL TANK VACUUM RELIEF VALVE (BUILT INTO FUEL FULLER CAP)"

OK or NG

>> GO TO 5.

>> Replace fuel filler cap with a genuine one.

INSTALL THE PRESSURE PUMP

To locate the EVAP leak, install EVAP service port adapter and pres-
sure pump to EVAP service port securely. For the location of EVAP
service port, refer to

EC-685, "EVAPORATIVE EMISSION LINE

DRAWING"

NOTE:
Improper installation of the EVAP service port adapter to the
EVAP service port may cause leaking.

Models with CONSULT-II>>GO TO 6.
Models without CONSULT-II>>GO TO 7.

PBIB1251E

SEF916U

Content .. 470 471 472 473 ..