Engine Will Not Start: Insight

Check for proper fuel level.
Check battery. See appropriate STARTERS article in STARTING & CHARGING SYSTEMS.
Check starting system. See appropriate STARTERS article in STARTING & CHARGING SYSTEMS.
Check fuel pressure. See BASIC DIAGNOSTIC PROCEDURES article.
Check ignition coils. See BASIC DIAGNOSTIC PROCEDURES article.
Check PGM-FI main relay. See SYSTEM & COMPONENT TESTING article.
Check starter switch signal. See SYSTEM & COMPONENT TESTING article.
Check clutch switch signal. See SYSTEM & COMPONENT TESTING article.
Check for low engine compression.
Check for intake system air leaks.
Check for a seized engine.
Check for a broken timing chain.
Check for contaminated fuel.