TSB : Diagnostic Procedures

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Connect scan tool. Turn ignition on, engine off. Using scan tool, view malfunction history DTCs. If DTC P0443 or P0449 is present, diagnose affected DTC. If DTCs are not present, go to next step. Using scan tool, command both the canister purge solenoid and EVAP vent solenoid on and off. If both solenoids click when commanded on and off, go to next step. If either or both solenoids does not click when commanded on and off, go to step 4). Using scan tool, run SERVICE BAY test. If test indicates PASS, problem is intermittent. See DIAGNOSTIC AIDS. If test does not indicate PASS, check for a kinked or pinched vent solenoid hose. Repair as necessary. If hose is okay, replace vent solenoid. Disconnect harness connector to affected solenoid. Using a test light, connect test light between harness connector terminals. Turn ignition on, engine off. If test light does not illuminate, go to next step. If test light illuminates, check control circuit for short to ground. Repair as necessary. If circuit is okay, replace faulty PCM. Using scan tool, command solenoid on. If test light illuminates, replace solenoid. If test light does not illuminate, connect test light between ground and source circuit. If test light does not illuminate, repair open in source circuit. If test light illuminates, check for open in control circuit or faulty terminal connection. Repair as necessary. If circuit or terminal connection is okay, replace PCM.