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DTC P0443 (CPC): EVAP Emission Control System Purge Control Valve Circuit Low Input

  1. Turn ignition on. Using DVOM connected to chassis ground, backprobe ECM connector terminal No. 72. See appropriate wiring diagram in WIRING DIAGRAMS article. If voltage reading is 10 volts or more, go to next step. If voltage reading is less than 10 volts, go to step 4).
  2. Turn ignition off. Disconnect purge control solenoid connector. Turn ignition on. Using DVOM connected to chassis ground, backprobe ECM connector terminal No. 72. If voltage is 10 volts or more, check for short in wiring between ECM connector and purge control solenoid connector. If voltage reading is less than 10 volts, go to next step.
  3. Turn ignition off. Check resistance between purge control solenoid terminals No. 1 and 2. If resistance is one ohm or less, replace purge control solenoid and ECM. If resistance is more than one ohm, check for poor contact in ECM connector. Repair as necessary. If terminal contacts are okay, replace ECM.
  4. Turn ignition off. Disconnect purge control solenoid and ECM connectors. Check resistance between purge control solenoid connector terminal No. 2 and chassis ground. If resistance is 10 ohms or less, repair short in wiring between ECM and purge control solenoid connector. If resistance is more than 10 ohms, go to next step.
  5. Check resistance between ECM connector terminal No. 72 and purge control solenoid connector terminal No. 2. If resistance is one ohm or less, go to next step. If resistance is more than one ohm, repair open in wiring between ECM and purge control solenoid connector.
  6. Remove purge control solenoid. Check resistance between purge control solenoid terminals. If resistance is 10-100 ohms, go to next step. If resistance is less than 10 or more than 100 ohms, replace purge control solenoid.
  7. Turn ignition on. Check voltage between purge control solenoid connector terminal No. 1 and chassis ground. If voltage is 10 volts or more, confirm there is a good connection at purge control solenoid connector. If voltage is less than 10 volts, repair open circuit in wiring between main relay connector and purge control solenoid connector.
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