Jeep Emission Control Visual Inspection Procedures
information, see appropriate article(s) in the ENGINE … The vehicle manufacturer’s emission control … be used as a guide only. Fig. 2: Typical Open & Closed Type PCV System THERMOSTATIC AIR CLEANER (TAC) The TAC supplies warm air to air intake during cold engine operation. This system is active during cold engine warm-up only.
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EMISSION CONTROL VISUAL INSPECTION * PLEASE READ THIS FIRST * NOTE: The following emission control visual inspection procedures should be used as a guide only. When performing a visual inspection, always follow your state’s recommended inspection procedures. A visual inspection is made to determine if any required emission control devices are missing, modified or disconnected. Missing, modified or disconnected systems must be made fully operational before a vehicle can be certified. POSITIVE CRANKCASE VENTILATION (PCV) PCV controls the flow of crankcase fumes into the intake manifold while preventing gases and flames from traveling in the opposite direction. PCV is either an open or closed system. See Fig. 2 . Ensure PCV system is installed as required. Verify valve, required hoses, connections, flame arresters, etc., are present, routed properly and in serviceable condition. Under all other operating conditions, air cleaner function is the same as any non-thermostatic unit. Ensure required exhaust shroud, hot air duct, vacuum hoses and air cleaner components are present and installed properly. See Fig. 3. Ensure any required thermostatic vacuum switches are in place and vacuum hoses are installed and in serviceable condition. Also ensure air cleaner lid is installed right side up.
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