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Home >> Nissan-Datsun >> 2003 >> Sentra Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 39 (Engine Controls - Self-Diagnostics - 1.8L - XE, GXE) >> Diagnostic Tests >> DTC P0456 Or DTC P1456 >> DTC Confirmation Test

DTC Confirmation Test

WARNING: This page is about a different car, the 2002 Nissan Sentra. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: If DTC confirmation test has been previously performed, always turn ignition off and wait at least 10 seconds before performing the next test.
NOTE: If fuel filler cap was removed, fuel tank was filled/drained or any EVAP control system parts were removed, wait at least one hour before performing DTC confirmation test.
NOTE: Before proceeding, open hood, and ensure battery voltage is more than 11 volts at idle.

With CONSULT-II

  1. Turn ignition on. Select DATA MONITOR mode with CONSULT-II.
  2. Ensure the following conditions are met:
    • FUEL LEVEL SE: 0.25-1.15 volts.
    • COOLAN TEMP/S: 32-90°F (0-32°C).
    • FUEL T/TMP SE: 32-95°F (0-35°C).
    • INT A/TEMP SE: more than 32°F (0°C).

    If all conditions are met, go to next step. If all conditions are not met, turn ignition off, and allow vehicle to cool. Or, drain/refill fuel until FUEL LEVEL SE indicates 0.25-1.15 volts. Wait at least one hour, then go to step  1 .

  3. Turn ignition off and wait at least 10 seconds. Turn ignition on. Select EVP V/S LEAK P0456/P1456 of EVAPORATIVE SYSTEM in DTC WORK SUPPORT mode with CONSULT- II. Follow instructions displayed.
    NOTE: If engine speed cannot be maintained within range displayed on CONSULT-II screen, perform BASIC INSPECTION. See ON-VEHICLE ADJUSTMENTS article.
  4. If OK is displayed on CONSULT-II, system is okay at this time. If NG is displayed, go to DIAGNOSTIC PROCEDURE  .
NOTE: Use the following test to check overall function of EVAP very small leak function. During this test, 1st trip DTC may not be confirmed.
CAUTION: To avoid damage to EVAP system, do not use compressed air. Do not start engine. Do not exceed .6 psi (4.12 kPa).

With Generic Scan Tool

  1. Connect EVAP Service Port Adapter (J41413-OBD) to EVAP service port. See Figure . Connect a suitable pressure pump with hose and gauge to adapter.
  2. Turn ignition on. Using scan tool, select MODE 8 to close EVAP-CVCV and open vacuum cut valve bypass valve. Apply .39 psi (2.7 kPa) to EVAP system.
  3. Observe gauge for 60 seconds. If pressure drops more than .06 psi (.4 kPa), go to DIAGNOSTIC PROCEDURE  . If pressure does not drop more than .06 psi (.4 kPa), go to next step.
  4. Disconnect scan tool. Start engine and warm to normal operating temperature. Turn ignition off and wait at least 10 seconds. Start engine and let it idle for 90 seconds.
  5. Hold engine speed at 2000 RPM for 30 seconds. Turn ignition off. For more information, refer to scan tool instruction manual.
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