P1442
DTC P1442 EVAP CONTROL SYSTEMOn Board Diagnosis Logic
NOTE: If DTC P1442 is displayed with P1448, perform trouble diagnosis for DTC P1448 first. P1448
This diagnosis detects leaks in the EVAP purge line using of vapor pressure in the fuel tank.
On Board Diagnosis Logic:
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 canister 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.
- Use only a genuine NISSAN rubber tube as a replacement.
DTC Confirmation Procedure
CAUTION: Never remove fuel filler cap during the DTC confirmation procedure.
NOTE:
- If DTC P0456 or P1456 is displayed with P0442, first perform trouble diagnosis for DTC P0456 or P1456.
- After repair, make sure that the hoses and clips are installed properly.
- 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:
- Open engine hood before conducting following procedure.
- If any of following condition is met just before the DTC confirmation procedure, leave the vehicle for more than 1 hour.
- Fuel filler cap is removed.
- Refilled or drained the fuel.
- EVAP component parts is/are removed.
- Before performing the following procedure, confirm that battery voltage is more than 11 V at idle.
WITH CONSULT-II
1. Turn ignition switch ON and select "DATA MONITOR" mode with CONSULT-II.
2. Make sure the following conditions are met.
FUEL LEVEL SE: 1.08 - 0.2 V
COOLAN TEMP/S: 0 - 35 °C (32 - 95 °F)
FUEL T/TMP SE: 0 - 32 °C (32 - 90 °F)
INT A/TEMP SE: More than 0 °C (32 °F)
If NG, turn ignition switch OFF and leave the vehicle in a cool place (soak the vehicle) or refilling/draining fuel until the output voltage condition of the "FUEL LEVEL SE" meets within the range above and leave the vehicle for more than 1 hour. Then start from step 1).
3. Turn ignition switch OFF and wait at least 5 seconds.
4. Turn ignition switch ON.
5. Select "EVAP V/S LEAK P0456/P1456" of "EVAPORATIVE SYSTEM" in "DTC WORK SUPPORT" mode with CONSULT-II.
Follow the instruction displayed.
6. Make sure that "OK" is displayed.
If "NG" is displayed, Refer to "Diagnostic Procedure" below.
NOTE:
- If the engine speed cannot be maintained within the range displayed on CONSULT-II screen, Go to "Basic Inspection".
- Make sure that EVAP hoses are connected to EVAP canister purge volume control solenoid valve properly.
Overall Function Check
WITH GST
Use this procedure to check the overall function of the EVAP very small leak function. During this check, a DTC might not be confirmed.
CAUTION:
- Never use compressed air, doing so may damage the EVAP system.
- Do not start engine.
- Do not exceeded 4.12 kPa (0.042 kg/sq.cm, 0.6 psi).
1. Attach the EVAP service port adapter securely to the EVAP service port.
2. Set the pressure pump and a hose.
3. Also set a vacuum gauge via 3-way connector and a hose.
4. Turn ignition switch ON.
5. Connect GST and select MODE 8.
6. Using MODE 8 control the EVAP canister vent control valve (close) and vacuum cut valve bypass valve (open).
7. Apply pressure and make sure the following conditions are satisfied.
Pressure to be applied: 2.7 kPa (20 mmHg, 0.79 inHg)
Time to be waited after the pressure drawn in to the EVAP system and the pressure to be dropped:
60 seconds and the pressure should not be dropped more than 0.4 kPa (3 mmHg, 0.12 inHg)
If NG, Go to "Diagnostic Procedure" below.
NOTE: For more information, Refer to GST instruction manual.
Diagnostic Procedure
Diagnostic Procedure (Steps 1 - 4):
Diagnostic Procedure (Steps 5 - 6):
Diagnostic Procedure (Steps 7 - 9):
Diagnostic Procedure (Steps 10 - 13):
Diagnostic Procedure (Steps 14 - 16):
Diagnostic Procedure (Step 17):
