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DTC P0443: EVAP Purge Solenoid Circuit: Testing

NOTE: Proportional purge solenoid may also be referred to as EVAP purge solenoid.
  1. Turn ignition on. Using scan tool, read DTCs. If GOOD TRIP counter is displayed and equal to zero, go to next step. If GOOD TRIP counter is not displayed and equal to zero, go to step  10 .
  2. Turn ignition off. Disconnect EVAP purge solenoid and PCM harness connectors. See Figure and Figure . Measure resistance of control circuit (Pink/Black wire) between EVAP purge solenoid harness connector and terminal No. 68 at PCM C2 harness connector. See Figure . If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Pink/Black wire.
  3. Measure resistance between ground and control circuit (Pink/Black wire) at EVAP purge solenoid harness connector. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair short to ground in Pink/Black wire.
  4. Measure resistance of sense circuit (Dark Green/Light Green wire) between EVAP purge solenoid harness connector and terminal No. 70 at PCM C2 harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Dark Green/Light Green wire.
  5. Measure resistance between ground and sense circuit (Dark Green/Light Green wire) at EVAP purge solenoid harness connector. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair short to ground in Dark Green/Light Green wire.
  6. Measure resistance between EVAP purge solenoid terminals (component side). If resistance is 10-15 ohms, go to next step. If resistance is not 10-15 ohms, replace EVAP purge solenoid.
  7. Disconnect hoses from EVAP purge solenoid. Using a hand vacuum pump, apply 10 in. Hg of vacuum to EVAP purge solenoid vacuum hose port. If EVAP purge solenoid holds vacuum, go to next step. If EVAP purge solenoid does not hold vacuum, replace EVAP purge solenoid.
  8. Reconnect all harness connectors. Ensure 10 in. Hg of vacuum is still applied to EVAP purge solenoid. Turn ignition on. Using scan tool, actuate EVAP purge solenoid. If vacuum drops when EVAP purge solenoid is actuated, go to next step. If vacuum does not drop when EVAP purge solenoid is actuated, replace EVAP purge solenoid.
  9. If no other possible causes are remaining, replace PCM.
  10. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition:
    • Wiggle EVAP purge solenoid wiring while circuit is actuated with scan tool. Listen for solenoid to stop actuating. Also, watch GOOD TRIP counter to change to zero. If solenoid stops actuating or GOOD TRIP counter changes to zero, repair wiring or connectors where wiggling caused solenoid to stop actuating or GOOD TRIP counter to change.
    • Review freeze frame information on scan tool. Duplicate conditions present when DTC was set.
    • Refer to any technical service bulletins that may apply.
    • Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires.
    • Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals.

    If a problem is found, repair as necessary. If no problems are found, test is complete.

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