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DTC P0459: EVAP System Purge Control Solenoid Valve Circuit High Input

NOTE: This diagnostic procedure is written for scan tool operation. Purge control solenoid valve can be operated by performing compulsory valve operation if Subaru Select Monitor is being used. See COMPULSORY VALVE OPERATION CHECK MODE  under SELF-DIAGNOSTIC SYSTEM.
  1. Perform test procedure. See TESTING PROCEDURE . Turn ignition off. Connect 2-pin Green test connector located under left side of instrument panel, near center of instrument panel. See Figure. Turn ignition on. Using a scan tool, activate purge control solenoid valve. While operating purge control solenoid valve, use a DVOM to measure voltage of Red/Green wire by backprobing between 35-pin ECM electrical harness connector B134 terminal No. 2 and good chassis ground point. See Figure. If voltage switches between zero and 10 volts, go to next step. If voltage does not switch between zero and 10 volts, circuit has returned to normal. Check for intermittent conditions. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES article. Clear memory. See CLEARING DIAGNOSTIC TROUBLE CODES . Validate repair by performing appropriate drive cycle. See DRIVE CYCLES .
  2. Turn ignition on. Using a DVOM, measure voltage of Red/Green wire by backprobing between 35-pin ECM electrical harness connector B134 terminal No. 2 and good chassis ground point. See Figure. If voltage is not more than 10 volts, go to next step. If voltage is more than 10 volts, go to step  4.
  3. Check for poor contact in 35-pin ECM electrical harness connector B134. Repair connector as required. If connector is okay, replace ECM. Clear memory. See CLEARING DIAGNOSTIC TROUBLE CODES . Validate repair by performing appropriate drive cycle. See DRIVE CYCLES .
  4. Turn ignition off. Disconnect Blue 2-pin purge control solenoid valve electrical harness connector. Turn ignition on. Using a DVOM, measure voltage of Red/Green wire by backprobing between 35-pin ECM electrical harness connector B134 terminal No. 2 and good chassis ground point. See Figure. If voltage is not more than 10 volts, go to next step. If voltage is more than 10 volts, repair short to voltage in wiring between ECM and purge control solenoid valve. After repair, replace ECM. Clear memory. See CLEARING DIAGNOSTIC TROUBLE CODES . Validate repair by performing appropriate drive cycle. See DRIVE CYCLES .
  5. Turn ignition off. Remove purge control solenoid valve. Using a DVOM, measure resistance across terminals of purge control solenoid valve. If resistance is not less than one ohm, go to next step. If resistance is less than one ohm, replace purge control solenoid valve and ECM. Clear memory. See CLEARING DIAGNOSTIC TROUBLE CODES . Validate repair by performing appropriate drive cycle. See DRIVE CYCLES .
  6. Check for poor contact in 35-pin ECM electrical harness connector B134. Repair connector as required. If connector is okay, replace ECM. Clear memory. See CLEARING DIAGNOSTIC TROUBLE CODES . Validate repair by performing appropriate drive cycle. See DRIVE CYCLES .
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