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Home >> Mazda >> 2001 >> MX-5 Miata Base, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System & Component Testing >> Emission Systems & Sub-Systems >> Fuel Evaporation (EVAP) System - MPV >> Purge Control Test

Purge Control Test

  1. Start engine. Disconnect vacuum hose from catch tank to purge solenoid valve at valve. Check that there is no vacuum at purge solenoid valve fitting when engine is cold. If no vacuum is present, go to next step. If vacuum is present, check purge solenoid valve and wiring between purge solenoid valve and PCM terminal No. 18. Repair as necessary.
  2. Warm engine to operating temperature. Turn ignition off. Connect scan tool to DLC-2. DLC-2 is located under left side of instrument panel, left of steering column. See Figure . Turn ignition on. Select PID/DATA MONITOR AND RECORD. Select ECT PID. Ensure ECT is more than 140°F (60°C). If ECT is as specified, go to next step. If ECT PID is 140°F (60°C) or less, check ECT sensor. Repair as necessary.
  3. Select SIMULATION TEST. Select PRG V PID. Press start. Using scan tool, increase purge solenoid valve duty cycle to 50 percent. If valve operation is heard, check vacuum hoses between intake manifold, purge solenoid valve, catch tank and charcoal canister. If valve operation is not heard, check purge solenoid valve. Repair as necessary.
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