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DTC P0446 (VCMSOL) - EVAP Emission Control System Vent Control

  1. Turn ignition on. Using DVOM connected to chassis ground, backprobe ECM harness connector terminal No. 35. See appropriate wiring diagram in WIRING DIAGRAMS article. If voltage reading is 10 volts or greater, go to next step. If voltage reading is less than 10 volts, go to step 4).
  2. Turn ignition off. Disconnect vent control solenoid harness connector. Turn ignition on. Using DVOM connected to chassis ground, backprobe ECM harness connector terminal No. 35. If voltage reading is 10 volts or greater, repair short in harness between ECM and purge control solenoid connectors. If voltage is less than 10 volts, go to next step.
  3. Turn ignition off. Check resistance between vent control solenoid terminals. If resistance is one ohm or less, replace vent control solenoid. If resistance is greater than one ohm, check for poor terminal contact to ECM harness connector. If terminal is okay, replace ECM.
  4. Turn ignition off. Disconnect ECM and vent control solenoid harness connectors. Check resistance between vent control solenoid harness connector terminal No. 2 and chassis ground. If resistance is 10 ohms or less, repair short in harness between ECM and vent control solenoid connectors. If resistance is greater than 10 ohms, go to next step.
  5. Check resistance between ECM harness connector terminal No. 35 and vent control solenoid harness connector terminal No. 2. If resistance is one ohm or less, go to next step. If resistance is greater than one ohm, check for open in harness between ECM and vent control solenoid connectors, or for poor terminal contacts.
  6. Check resistance between vent control solenoid harness connector terminals No. 1 and 2. Resistance should be 10-100 ohms. If resistance is as specified, go to next step. If resistance is not as specified, replace vent control solenoid.
  7. Reconnect ECM harness connector. Turn ignition on. Check voltage between vent control harness connector terminal No. 1 and chassis ground. If voltage reading is 10 volts or greater, check for poor terminal contact at vent solenoid harness connector. If voltage reading is less than 10 volts, check for open in harness between main relay and vent control solenoid, or for poor terminal connections.
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