Does Not Start

Engine Does Not Crank

On all models except Prius, check battery and battery cables.
On all models except Prius, check starter. See appropriate STARTERS article in STARTING & CHARGING SYSTEMS.
On all models except Prius, check starter relay. See appropriate STARTERS article in STARTING & CHARGING SYSTEMS.
On A/T models except MR2 and Prius, check park/neutral position switch. See PARK/NEUTRAL POSITION SWITCH under ENGINE SENSORS & SWITCHES in appropriate SYSTEM & COMPONENT TESTING article.
On Prius, the Hybrid Vehicle (HV) control Electronic Control Unit (ECU) or Motor Generator No. 1 (MG1) may be the problem. Consult authorized dealer for servicing.

No Initial Combustion

Check Engine Control Module (ECM) power source circuit. See ENGINE CONTROL MODULE POWER SOURCE CIRCUIT under COMPUTERIZED ENGINE CONTROLS in appropriate SYSTEM & COMPONENT TESTING article.
On Avalon, Camry 2.2L 4-cylinder gasoline models, Camry 3.0L V6, Camry Solara, Highlander, Land Cruiser, MR2, Prius, RAV4, Sequoia, Sienna and 4Runner, check engine immobilizer system (if equipped). See appropriate ENGINE IMMOBILIZER SYSTEMS article in ACCESSORIES & EQUIPMENT.
On Avalon, Camry 2.2L 4-cylinder gasoline models, Camry 3.0L V6, Camry Solara, Celica, Corolla, ECHO, Highlander, MR2, Prius, RAV4, Sienna, Tacoma, Tundra 3.4L V6 and 4Runner, check fuel pump control circuit. See FUEL PUMP CONTROL CIRCUIT under COMPUTERIZED ENGINE CONTROLS in appropriate SYSTEM & COMPONENT TESTING article.
On Land Cruiser, check fuel pump control circuit. See DTC P1200: FUEL PUMP RELAY/ECU CIRCUIT test in SELF-DIAGNOSTICS - LAND CRUISER article. Also, check fuel pump switch. See FUEL PUMP SWITCH (LAND CRUISER) under FUEL DELIVERY under FUEL SYSTEM in SYSTEM & COMPONENT TESTING - V6 & V8 article.
On Sequoia and Tundra 4.7L V8, check fuel pump control circuit. See DTC P1200: FUEL PUMP RELAY CIRCUIT test in appropriate SELF-DIAGNOSTICS article.
On all models, check Engine Control Module (ECM) electrical connector for loose, damaged or corroded terminals and repair as necessary. For illustration of ECM location, see THEORY & OPERATION article. If electrical connector is okay, check ECM ground circuits. See WIRING DIAGRAMS article. Repair as necessary. If ground circuits are okay, replace ECM with a known-good ECM and retest.

No Complete Combustion

On Avalon, Camry 2.2L 4-cylinder gasoline models, Camry 3.0L V6, Camry Solara, Celica, Corolla, ECHO, Highlander, MR2, Prius, RAV4, Sienna, Tacoma, Tundra 3.4L V6 and 4Runner, check fuel pump control circuit. See FUEL PUMP CONTROL CIRCUIT under COMPUTERIZED ENGINE CONTROLS in appropriate SYSTEM & COMPONENT TESTING article.
On Land Cruiser, check fuel pump control circuit. See DTC P1200: FUEL PUMP RELAY/ECU CIRCUIT test in SELF-DIAGNOSTICS - LAND CRUISER article.
On Sequoia and Tundra 4.7L V8, check fuel pump control circuit. See DTC P1200: FUEL PUMP RELAY CIRCUIT test in appropriate SELF-DIAGNOSTICS article.