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Home >> Infiniti >> 2003 >> QX4 RWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0456: EVAP Control System - Very Small Leak >> DTC Confirmation Test (Using CONSULT-II)

DTC Confirmation Test (Using CONSULT-II)

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. Before proceeding, ensure battery voltage is more than 11 volts at idle. If DTC confirmation procedure had been previously run, turn ignition off and wait at least 10 seconds before continuing.
  1. Turn ignition on. Select DATA MONITOR mode with CONSULT-II.
  2. Ensure the following conditions are met:
    • FUEL LEVEL SE: 0.20-1.08 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 0.20-1.08 volts. Wait at least one hour, then go to step  1.

  3. Turn ignition off and wait at least 5 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 BASIC INSPECTION under THROTTLE POSITION SENSOR, IGNITION TIMING & IDLE SPEED in 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 .
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