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Symptom: P0456-EVAP SYSTEM SMALL LEAK When Monitored and Set Condition: P0456-EVAP SYSTEM SMALL LEAK When Monitored: Ignition off. Fuel Level less than 88%. Ambient Temperature between 4°C to 43°C (39°F to 109°F) Set Condition: Due to temperature changes a vacuum is created in the fuel tank and EVAP system. With the EVAP system sealed, the PCM monitors the NVLD switch. If the POSSIBLE CAUSES INTERMITTENT CONDITION VISUAL AND PHYSICAL INSPECTION EVAPORATIVE EMISSION LEAK DETECTION TEST ACTION APPLICABILITY 1 NOTE: The difference in ambient temperature, outside temp VS shop temp, t, read DTCs and record the related Freeze Frame data. Is the Good Trip Counter displayed and equal to zero? All Yes → Go To 2 No → Go To 4 2 Perform a visual and physical inspection of the entire Evaporative Emission system. All Yes → Repair as necessary. Perform POWERTRAIN VERIFICATION TEST VER - 5. No → Go To 3 178 DRIVEABILITY - NGC |