Symptom Checks

Check the following items:

• Check starting system.
• Check EGR system.
• Check for contaminated MAF sensor.
• Check cooling system for overheating (hard hot start only).
• Check ignition system. See CIRCUIT TEST JD in TESTS W/CODES article.
• Check fuel delivery system. See CIRCUIT TEST HC in TESTS W/CODES article.
• Check PCV system. See CIRCUIT TEST HG in TESTS W/CODES article.
• Check Evaporative Emission (EVAP) system. See CIRCUIT TEST HW in TESTS W/CODES article.
• Check air intake system. See CIRCUIT TEST HU in TESTS W/CODES article.