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EVAP/PURGE SOLENOID DESCRIPTION OPERATION All vehicles use a proportional purge solenoid (Fig. 2). The solenoid regulates the rate of vapor flow from During the cold start warm-up period and the hot start time delay, the PCM does not energize the sole- The proportional purge solenoid operates at a fre- quency of 200 hz and is controlled by an engine con- Fig. 1 ORVR System Schematic (PZEV) 1 - FUEL TANK (PLASTIC) 11 - NATURAL VACUUM LEAD DETECTION (NVLD) 2 - FUEL FILLER TUBE 12 - LIQUID SEPARATOR (IF EQUIPPED) 3 - FUEL CAP (PRESSURE/RELIEF) 13 - ENGINE WIRING HARNESS TO NVLD 4 - FILL TUBE TO FUEL TANK CONNECTOR (ELASTOMERIC) 14 - VAPOR CANISTER 5 - TANK VENT/ROLLOVER VALVE(S) 15 - PURGE LINE 6 - VAPOR RECIRCULATION LINE 16 - PURGE DEVICE 7 - TANK VAPOR LINE 17 - WITHOUT NVLD 8 - VAPOR LINE TO CANISTER 18 - BREATHER ELEMENT 9 - CHECK VALVE (N/C) 19 - FLOW CONTROL ORIFICE 10 - CONTROL VALVE 20 - SERVICE PORT 25 - 12 EVAPORATIVE EMISSIONS PT EVAPORATIVE EMISSIONS (Continued) |