P1440

On Board Diagnosis Logic

NOTE: If DTC P1440 is displayed with P1448, perform trouble diagnosis for DTC P1448 first.

This diagnosis detects leaks in the EVAP purge line using of 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 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

NOTE:
- If DTC P1440 is displayed with P1448, perform trouble diagnosis for DTC P1448 first.
- If "DTC Confirmation Procedure" has been previously conducted, always turn ignition switch "OFF" and wait at least 5 seconds before conducting the next test.




With CONSULT

CAUTION:
- Never use compressed air or high pressure pump. Otherwise, EVAP system may be damaged.
- Do not exceed 4.12 kPa (0.042 kg/sq.cm, 0.6 psi) of pressure in EVAP system.
- Do not start engine.

NOTE:
- Always remove EVAP service port adapter from EVAP service port after applying air up to 0.69 to 1.38 kPa (5.14 to 10.34 mmHg, 0.202 to 0.407 inHg).
- During the test, clamp the EVAP hose tightly as shown at left.

1. Turn ignition switch "OFF".
2. Clamp the EVAP hose as shown at left.




3. Install EVAP service port adapter and pressure pump to EVAP service port securely.
4. Turn ignition switch "ON".
5. Select "EVAP SML LEAK P1440" of "EVAPORATIVE SYSTEM" in "DTC WORK SUPPORT" mode with CONSULT. Follow the instruction displayed.
6. Make sure that "OK" is displayed.
If "NG" is displayed, refer to "Diagnostic Procedure" below.

With GST

NOTE:
- Be sure to read the explanation of "Driving Pattern" on before driving vehicle.
- It is better that fuel level is low.

1. Start engine.
2. Drive vehicle according to "Driving Pattern".
3. Stop vehicle.
4. 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.




5. Turn ignition switch "OFF" and wait at least 5 seconds.




6. Start engine.
It is not necessary to cool engine down before driving.
7. Drive vehicle again according to the "Driving Pattern".
8. Stop vehicle.
9. Select "MODE 3" with GST.
- If P0440 is displayed on the screen, go to "Diagnostic Procedure" below.
- If P1440 is displayed on the screen, go to "Diagnostic Procedure" for "DTC P1440".
- If P1447 is displayed on the screen, go to "Diagnostic Procedure" for "DTC P1447".
- If P0440, P1440 and P1447 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 5.

Without Scan Tool

NOTE:
- Be sure to read the explanation of "Driving Pattern" on before driving vehicle.
- It is better that the fuel level is low.

1. Start engine.
2. Drive vehicle according to "Driving Pattern".
3. Stop vehicle.
4. Turn ignition switch "OFF" and wait at least 5 seconds.
5. Turn ignition switch "ON" and perform "Diagnostic Test Mode II (Self-diagnostic results)" with ECM.
6. If 1st trip DTC is detected, go to "Diagnostic Procedure" below.

Diagnostic Procedure

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