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Engine Controls - Theory & Operation Expand All (for easy ctrl-f) Collapse All Introduction Air Induction Systems Computerized Engine Controls Engine Control System Engine Immobilizer System Engine Control Module (ECM) Variable Valve Lift (VVL) System Variable Valve Timing (VVT) System Input Devices Notes Accelerator Pedal Position Sensor (Land Cruiser & Tundra 4.7L V8) A/C Compressor Lock Sensor (Camry 2.2L 4-Cyl. CNG Models, Camry 2.2L 4-Cyl. Gasoline Models With Manual A/C & Camry Solara 2.2L 4-Cyl. Models With Manual A/C) A/C Evaporator Temperature Sensor (Camry 2.2L 4-Cyl. CNG Models, Camry 2.2L 4-Cyl. Gasoline Models With Manual A/C & Camry Solara 2.2L 4-Cyl. With Manual A/C) A/C Switch (All Models) Air/Fuel (A/F) Sensor (Avalon, Camry 2.2L 4-Cyl. CNG Models, Camry 2.2L 4-Cyl. Gasoline Models With Calif. Emissions, Camry 3.0L V6 Calif. Emission Vehicles, Camry Solara 2.2L 4-Cyl. Calif. Emission Vehicles, Camry Solara 3.0L V6 Calif. Emission Vehicles, RAV4 Calif. Emission Vehicles, Sienna Calif. Emission Vehicles, Tacoma 2.4L 4-Cyl. Calif. Emission Vehicles, Tacoma 2.7L 4-Cyl. Calif. Emission Vehicles, Tacoma 3.4L V6 Calif. Emission Vehicles, Tundra 3.4L V6 Calif. Emission Vehicles, 4Runner 2.7L 4-Cyl. Calif. Emission Vehicles & 4Runner 3.4L V6 Calif. Emission Vehicles) Airflow Meter (Avalon, Camry 3.0L V6, Camry Solara 3.0L V6, Celica, Corolla, ECHO, Land Cruiser, Sienna, Tacoma, Tundra & 4Runner) Battery Signal (Avalon, Camry, Camry Solara, Celica, ECHO, RAV4, Sienna, Tacoma, Tundra 3.4L V6 & 4Runner) Battery Signal (Corolla) Battery Signal (Land Cruiser & Tundra 4.7L V8) Brakelight Signal (Avalon, Camry, Camry Solara, Celica, Corolla With A/T, ECHO, Land Cruiser, Sienna, Tacoma Calif. Emission Vehicles, Tundra & 4Runner) Brakelight Signal (RAV4 With A/T & Tacoma Except Calif. Emission Vehicles) Camshaft & Crankshaft Position Sensors (Avalon) Camshaft & Crankshaft Position Sensors (Camry 2.2L 4-Cyl. CNG & Gasoline Models, & Camry Solara 2.2L 4-Cyl.) Camshaft & Crankshaft Position Sensors (Camry 3.0L V6 & Camry Solara 3.0L V6) Camshaft & Crankshaft Position Sensors (Celica, Corolla & ECHO) Camshaft & Crankshaft Position Sensors (Land Cruiser) Camshaft & Crankshaft Position Sensors (RAV4) Camshaft & Crankshaft Position Sensors (Sienna) Camshaft & Crankshaft Position Sensors (Tacoma 2.4L 4-Cyl. & 2.7L 4-Cyl., & 4Runner 2.7L 4-Cyl.) Camshaft & Crankshaft Position Sensors (Tacoma 3.4L V6, Tundra 3.4L V6 & 4Runner 3.4L V6) Camshaft & Crankshaft Position Sensors (Tundra 4.7L V8) Center Air Bag Sensor Assembly (Camry 2.2L CNG Models, Celica & Corolla) EGR Gas Temperature Sensor (Camry 3.0L V6, Camry Solara 3.0L V6, Tacoma 2.4L 4-Cyl. 2RZ-FE Except Calif. Emission Vehicles, Tacoma 2.7L 4-Cyl. 3RZ-FE & 4Runner 2.7L 4-Cyl.) EGR Position Sensor (Camry 3.0L V6 & Camry Solara 3.0L V6) Electrical Load Signal (Avalon, Camry 3.0L V6, Camry Solara 3.0L V6 & Sienna) Electrical Load Signal (Camry 2.2L 4-Cyl. CNG & Gasoline Models, Camry Solara 2.2L 4-Cyl., Land Cruiser, RAV4, Tacoma 2.4L 4-Cyl. 2RZ-FE, Tundra 4.7L V8 & 4Runner 2.7L 4-Cyl. With A/T) Electrical Load Signal (Corolla) Electrical Load Signal (ECHO) Engine Coolant Temperature (ECT) Sensor (All Models) Engine Cranking Signal (All Models) Fuel Pipe Fuel Pressure Sensor (Camry 2.2L 4-Cyl. CNG Models) Fuel Rail Fuel Pressure Sensor (Camry 2.2L 4-Cyl. CNG Models) Fuel Rail Fuel Temperature Sensor (Camry 2.2L 4-Cyl. CNG Models) Fuel Tank Fuel Temperature Sensor (Camry 2.2L 4-Cyl. CNG Models) Heated Oxygen Sensor (All Models) Intake Air Temperature Sensor (Avalon, Camry 3.0L V6, Camry Solara 3.0L V6, Celica, Corolla, ECHO, Land Cruiser, Sienna, Tacoma, Tundra & 4Runner) Intake Air Temperature Sensor (Camry 2.2L 4-Cyl. CNG & Gasoline Models, Camry Solara 2.2L 4-Cyl. & RAV4) Knock Sensor (Avalon, Camry 3.0L V6, Camry Solara 3.0L V6, Land Cruiser, Sienna & Tundra 4.7L V8) Knock Sensor (Camry 2.2L 4-Cyl. Gasoline Models, Camry Solara 2.2L 4-Cyl., Celica, Corolla, ECHO, RAV4, Tacoma 2.4L 4-Cyl. & 2.7L 4-Cyl., & 4Runner 2.7L 4-Cyl.) Knock Sensor (Tacoma 3.4L V6, Tundra 3.4L V6 & 4Runner 3.4L V6) Manifold Absolute Pressure (MAP) Sensor (Camry 2.2L 4-Cyl. CNG & Gasoline Models, Camry Solara 2.2L 4-Cyl. & RAV4) Park/Neutral Position Switch (A/T Models) Power Steering Pressure Sensor (ECHO) Power Steering Pressure Switch (Avalon, Camry, Camry Solara, Celica, Corolla, Sienna, Tacoma 2.4L 2RZ-FE Calif. Emission Vehicles, Tacoma 2.7L 3RZ-FE Calif. Emission Vehicles, Tacoma 3.4L V6, Tundra 3.4L V6, 4Runner 2.7L 4-Cyl. Calif. Emission Vehicles & 4Runner 3.4L V6) Temperature Control Switch (ECHO) Throttle Position (TP) Sensor (Avalon, Camry, Camry Solara, Celica, Corolla, ECHO, RAV4, Sienna, Tacoma, Tundra 3.4L V6 & 4Runner) Throttle Position (TP) Sensor (Land Cruiser & Tundra 4.7L V8) Vapor Pressure Sensor (Avalon, Camry 2.2L 4-Cyl. Gasoline Models, Camry 3.0L V6, Camry Solara, Celica & Corolla) Vapor Pressure Sensor (ECHO) Vapor Pressure Sensor (Land Cruiser, RAV4, Sienna, Tacoma, Tundra & 4Runner) Variable Valve Timing (VVT) Sensor (Avalon) Variable Valve Timing (VVT) Sensor (Celica, Corolla & ECHO) Vehicle Speed Sensor (Avalon, Sienna & 4Runner 3.4L V6) Vehicle Speed Sensor (Camry, Camry Solara, Celica, Corolla, ECHO, Land Cruiser, RAV4, Tacoma, Tundra & 4Runner 2.7L 4-Cyl.) 4WD Switch (Tacoma, Tundra 3.4L V6 & 4Runner) Output Signals Fuel Systems Fuel Delivery Notes A/F Heater Relay (Avalon, Camry 3.0L V6 Calif. Emission Vehicles, Camry Solara 3.0L V6 Calif. Emission Vehicles & Sienna Calif. Emission Vehicles) Circuit Opening Relay (Avalon) Circuit Opening Relay (Camry 2.2L 4-Cyl. CNG Models) Circuit Opening Relay (Camry 2.2L 4-Cyl. Gasoline Models, Camry 3.0L V6 & Camry Solara) Circuit Opening Relay (Celica & ECHO) Circuit Opening Relay (Corolla) Circuit Opening Relay (RAV4) Circuit Opening Relay (Sienna) Circuit Opening Relay (Tacoma) Circuit Opening Relay (Tundra 3.4L V6) Circuit Opening Relay (Tundra 4.7L V8) Circuit Opening Relay (4Runner) EFI Main Relay (Avalon) EFI Main Relay (Camry 2.2L 4-Cyl. CNG Models) EFI Main Relay (Camry 2.2L 4-Cyl. Gasoline Models & Camry Solara 2.2L 4-Cyl.) EFI Main Relay (Camry 3.0L V6 & Camry Solara 3.0L V6) EFI Main Relay (Celica) EFI Main Relay (Corolla) EFI Main Relay (ECHO) EFI Main Relay (Land Cruiser) EFI Main Relay (RAV4) EFI Main Relay (Sienna) EFI Main Relay (Tacoma 2.4L 4-Cyl. & 2.7L 4-Cyl.) EFI Main Relay (Tacoma 3.4L V6) EFI Main Relay (Tundra 3.4L V6) EFI Main Relay (Tundra 4.7L V8) EFI Main Relay (4Runner 2.7L 4-Cyl.) EFI Main Relay (4Runner 3.4L V6) Fuel Manual Shutoff Valve & Fuel Filter Assembly (Camry 2.2L 4-Cyl. CNG Models) Fuel Pump (Avalon, Camry 2.2L 4-Cyl. Gasoline Models, Camry 3.0L V6, Camry Solara, Celica, Corolla, ECHO, RAV4, Sienna, Tacoma, Tundra 3.4L V6 & 4Runner) Fuel Pump (Land Cruiser) Fuel Pump (Tundra 4.7L V8) Fuel Pump Electronic Control Unit (ECU) & Fuel Pump Switch (Land Cruiser) Fuel Pump Relay & Fuel Pump Resistor (Tundra 4.7L V8) Fuel Pressure Regulator (Avalon, Camry 2.2L 4-Cyl. Gasoline Models, Camry 3.0L V6, Camry Solara, Celica, Corolla, ECHO, RAV4 & Sienna) Fuel Pressure Regulator (Camry 2.2L 4-Cyl. CNG Models) Fuel Pressure Regulator (Land Cruiser, Tacoma, Tundra & 4Runner) Fuel Pressure Regulator Fuel Shutoff Valve (Camry 2.2L 4-Cyl. CNG Models) Fuel Rail Fuel Shutoff Valve (Camry 2.2L 4-Cyl. CNG Models) Fuel Tank Fuel Shutoff Valve (Camry 2.2L 4-Cyl. CNG Models) Fuel Tank Valve Assembly (Camry 2.2L 4-Cyl. CNG Models) IG2 Relay (Avalon, Celica & RAV4) Fuel Control Idle Speed A/C-Cut Control System (Camry 2.2L 4-Cyl. CNG & Gasoline Models, Camry Solara 2.2L 4-Cyl., Celica, Corolla, ECHO & RAV4) Dashpot (Tacoma 3.4L V6 With M/T & 4Runner 3.4L V6 With M/T) Idle Speed Control System (Avalon, Camry, Camry Solara, Celica, Corolla, ECHO, RAV4, Sienna, Tacoma, Tundra 3.4L V6 & 4Runner) Throttle Control Motor (Land Cruiser & Tundra 4.7L V8) Throttle Opener (Avalon, Camry, Camry Solara, RAV4, Sienna, Tacoma, Tundra 3.4L V6 & 4Runner) Ignition Systems Emission Systems & Sub-Systems Self-Diagnostic Systems Miscellaneous Controls