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
NVLD switch does not close within a calibrated amount of time an error is detected.
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,
may conceal a leak, it is best to perform this test after the vehicle’s
temperature has stabilized in the work area.
Ignition on, engine not running.
With the DRBIIIt, 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.
Check for the following conditions:
- Holes or cracks
- Loose seal points
- Evidence of damaged components
- Incorrect routing of hoses and tubes
- Fuel Cap gasket seal
Were any of the above conditions found?
All
Yes → Repair as necessary.
Perform POWERTRAIN VERIFICATION TEST VER-5-NGC.
No → Go To 3
174
DRIVEABILITY - NGC
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