DTC Confirmation Test

Ensure intake air temperature is 18°F (-8°C) or more, vehicle is at an altitude of 8000 feet or below, engine coolant temperature is at 18-230°F (-8-110°C), and barometric pressure is 75 kPa or more. Turn ignition off, connect scan tool and turn ignition on. Using scan tool, clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. Drive vehicle at speeds of 35 MPH or more for 20 minutes. Continue driving at speeds of 30-40 MPH for 3 minutes with throttle constant. Stop vehicle. Using scan tool, check for current or pending DTC P0496. See RETRIEVING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. If DTC resets, go to DIAGNOSIS & REPAIR PROCEDURE .

If no DTC are set, using scan tool, check completion status of EVAP MONITORING TEST in READINESS TESTS mode. If testing has not been completed, drive vehicle at speeds of 35 MPH or more for 20 minutes. Continue driving at speeds of 30-40 MPH for 3 minutes with throttle constant. Stop vehicle. Using scan tool, check for current or pending DTCs P0496. See RETRIEVING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. If DTC does not reset, perform visual inspection of intake system. Check for intake air leaks, loose or poor vacuum hose and wiring harness connections. Check for intermittent problem. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES article. If problem is found, repair as necessary. After repair, repeat DTC confirmation procedure starting at beginning. If DTC resets, go to DIAGNOSIS & REPAIR PROCEDURE .