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EXHAUST EMISSION CONTROLS INDEX page page Air Aspiration System . . . . . . . . . . . . . . . . . . . . . 24 EGR Gas Flow Test . . . . . . . . . . . . . . . . . . . . . . 21 EGR System On-Board Diagnostics . . . . . . . . . . . 21 EGR Tube Service—2.2L and 2.5L TBI Engines . 22 EGR Tube Service—3.0L Engines . . . . . . . . . . . . 22 EGR Tube Service—3.3L and 3.8L Engines . . . . 22 EGR Valve Service—2.2L and 2.5L TBI Engines . 22 EGR Valve Service—3.0L Engines . . . . . . . . . . . 22 EGR Valve Service—3.3L and 3.8L Engines . . . . 22 Exhaust Gas Recirculation (EGR) System . . . . . . 20 Exhaust Gas Recirculation (EGR) System Test . . 21 Heated Inlet Air System . . . . . . . . . . . . . . . . . . . 17 Heated Oxygen Sensor (O 2 Sensor) . . . . . . . . . . 18 HEATED INLET AIR SYSTEM 2.5L MPI (Flexible Fuel AA-body), Turbo III, 3.0L, 3.3L and 3.8L engines do not use a heated inlet air 2.2L and 2.5L TBI air cleaners have a heated air assembly (Fig. 1). When ambient temperatures are The heated air assembly contains a vacuum oper- ated blend door. The blend door opens to either Air flows through the outside air inlet when ambi- ent air temperature is 8°C (15°F) or more above the When ambient air temperature falls below the con- trol temperature, air flows through both the ambient HEATED INLET AIR SYSTEM SERVICE Heated air inlet system malfunctions may affect driveability and vehicle exhaust emissions. Use the following procedure to determine if the system functions properly. (1) Inspect the condition of the heat stove to air cleaner flexible connector and all vacuum hoses. In- (2) With a cold engine and ambient temperature less than 46°C (115°F.), the heat control door (valve (3) With the engine warmed up and running, check the temperature of the air entering the snorkel Fig. 1 Heated Air Inlet System Fig. 2 Heated Air Temperature Sensor Ä EMISSION CONTROL SYSTEMS 25 - 17 |