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HOMESERVICE MANUALSCHRYSLER2004PT CRUISER TOURING, 2.4 B, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 91 (POWERTRAIN DIAGNOSTIC PROCEDURES)SYSTEM DESCRIPTION AND FUNCTIONAL OPERATIONFUNCTIONAL OPERATIONOTHER CONTROLSNVLD LEAK DETECTIONMEDIUM AND LARGE LEAK TEST (INTRUSIVE)
2004 Chrysler PT Cruiser Touring, 2.4 B, Automatic

Medium and Large Leak Test (Intrusive)

2004 Chrysler PT Cruiser Touring, 2.4 B, AutomaticSECTION Medium and Large Leak Test (Intrusive)
WARNING: This page is about a different car, the 2004 Dodge Intrepid, 2004 Chrysler Intrepid, 2004 Chrysler Concorde, and 2004 Chrysler 300M. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: This intrusive test will only be run if the Small Leak (passive) test fails, or is inconclusive (the switch does not close)

Enabling Conditions:

  • 40°F to 90°F
  • Engine temperature at startup within 10°F of the ambient temperature
  • Fuel level less than 85%

    The intrusive Medium and Large leak are conducted as follows:

  • De-energize the NVLD solenoid to seal the canister vent.
  • Activate purge shortly after closed loop. Pull the tank vacuum past the vacuum switch point (1" H2O vacuum) of the NVLD for a specific time while tracking the standard purge flow rate.
  • Turn purge off and determine how long it takes to decay the tank vacuum and reopen the switch. Determine the leak size from the time it took to reopen the switch.
    NOTE: Fuel level is an important determining factor.
  • If the switch does not close, a more aggressive purge flow will be applied to determine if it is a very large leak, missing fuel cap, problem with the NVLD device, purge flow problem, etc...
    Fig 1: Identifying Neutral Vacuum Leak Detection System Chart
    G03499015Courtesy of DAIMLERCHRYSLER CORP.
Fig 2: Identifying NVLD Assembly Internal Schematic Chart
G03499016Courtesy of DAIMLERCHRYSLER CORP.
RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.