Engine Controls - Theory & Operation
- 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