Preliminary Inspection

• Verify on-board diagnostics are working by performing appropriate ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK in appropriate SELF-DIAGNOSTICS article.
• Ensure PCM and MIL function properly.
• Ensure no DTCs (except intermittent) are stored.
• Ensure fuel control system operates properly. See appropriate BASIC DIAGNOSTIC PROCEDURES article.
• Perform fuel system pressure test.
• Visually inspect all systems.

After all checks have been performed, verify customer complaint and locate correct symptom. Check items indicated under that symptom. Not all items listed under each symptom apply to all models and systems. These procedures normally recommend testing of a specific system or component, such as EGR, EST, TCC, etc. See appropriate SYSTEM & COMPONENT TESTING article for test procedures.