Engine Controls - Theory & Operation

• Introduction
• Air Induction System
  • Electronic Throttle Control System (ETCS)
    • Notes
    • Land Cruiser
  • Intake Air Control Valve System
    • Notes
    • Avalon, Camry 3.0L V6, Camry Solara 3.0L V6 & Sienna
• Computerized Engine Controls
  • Engine Control System
  • Engine Immobilizer System
    • Avalon, Camry, Camry Solara, Land Cruiser, Sienna & 4Runner
  • Engine Control Module (ECM)
  • Input Devices
    • Notes
    • Accelerator Pedal Position Sensor (Land Cruiser)
    • A/C Compressor Lock Sensor (Camry & Camry Solara)
    • A/C Switch (All Models)
    • Air/Fuel (A/F) Sensor (Avalon Calif. Emission Vehicles, Camry 2.2L 4-Cyl. Calif. Emission Vehicles, Camry 3.0L V6 Calif. Emission Vehicles With A/T, Camry Solara 2.2L 4-Cyl. Calif. Emission Vehicles, Camry Solara 3.0L V6 Calif. Emission Vehicles With A/T, RAV4 Calif. Emission Vehicles, Sienna Calif. Emission Vehicles & 4Runner 3.4L V6 Calif. Emission Vehicles)
    • Airflow Meter (Avalon, Camry 3.0L V6, Camry Solara 3.0L V6, Land Cruiser, Sienna, Tacoma & 4Runner)
    • Battery Signal (Avalon, Camry, Camry Solara, Celica, RAV4, Sienna, Tacoma & 4Runner)
    • Battery Signal (Corolla)
    • Battery Signal (Land Cruiser)
    • Brakelight Signal (Avalon, Camry, Camry Solara, Corolla With 4-Speed A/T, Land Cruiser, Sienna & 4Runner 3.4L V6 With A/T)
    • Brakelight Signal (Celica With A/T, RAV4 With A/T, Tacoma & 4Runner 2.7L 4-Cyl.)
    • Camshaft & Crankshaft Position Sensors (Avalon, Camry 3.0L V6 & Camry Solara 3.0L V6)
    • Camshaft & Crankshaft Position Sensors (Camry 2.2L 4-Cyl. & Camry Solara 2.2L 4-Cyl.)
    • Camshaft & Crankshaft Position Sensors (Celica)
    • Camshaft & Crankshaft Position Sensors (Corolla)
    • 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 & 4Runner 3.4L V6)
    • EGR Gas Temperature Sensor (Avalon, Camry 3.0L V6, Camry Solara 3.0L V6, Tacoma 2.4L 4-Cyl. & 2.7L 4-Cyl., & 4Runner 2.7L 4-Cyl.)
    • EGR Position Sensor (Avalon, 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., Camry Solara 2.2L 4-Cyl., Celica, Land Cruiser, RAV4, Tacoma 2.4L 4-Cyl 2RZ-FE & 4Runner 2.7L 4-Cyl. With A/T)
    • Electrical Load Signal (Corolla)
    • Engine Coolant Temperature (ECT) Sensor (All Models)
    • Engine Cranking Signal (All Models)
    • Intake Air Temperature Sensor (Avalon, Camry 3.0L V6, Camry Solara 3.0L V6, Land Cruiser, Sienna, Tacoma & 4Runner)
    • Intake Air Temperature Sensor (Camry 2.2L 4-Cyl., Camry Solara 2.2L 4-Cyl., Celica, Corolla & RAV4)
    • Knock Sensor (Avalon, Camry 3.0L V6, Camry Solara 3.0L V6, Land Cruiser & Sienna)
    • Knock Sensor (Camry 2.2L 4-Cyl., Camry Solara 2.2L 4-Cyl., Celica, Corolla, Tacoma 2.4L 4-Cyl. & 2.7L 4-Cyl., & 4Runner 2.7L 4-Cyl.)
    • Knock Sensor (RAV4)
    • Knock Sensor (Tacoma 3.4L V6 & 4Runner 3.4L V6)
    • Manifold Absolute Pressure (MAP) Sensor (Camry 2.2L 4-Cyl., Camry Solara 2.2L 4-Cyl., Celica, Corolla & RAV4)
    • Oxygen Sensor (All Models)
    • Park/Neutral Position Switch (A/T Models)
    • Power Steering Pressure Switch (Avalon, Camry, Camry Solara, Corolla, Sienna, Tacoma 3.4L V6 & 4Runner 3.4L V6)
    • Throttle Position (TP) Sensor (Avalon, Camry, Camry Solara, Celica, Corolla, RAV4, Sienna, Tacoma & 4Runner)
    • Throttle Position (TP) Sensor (Land Cruiser)
    • Vapor Pressure Sensor (All Models)
    • Vehicle Speed Sensor (Avalon, Camry, Camry Solara, Celica, Corolla, Land Cruiser, RAV4, Tacoma & 4Runner 2.7L 4-Cyl.)
    • Vehicle Speed Sensor (Sienna & 4Runner 3.4L V6)
    • 4WD Switch (Tacoma & 4Runner)
  • Output Signals
    • Notes
    • Accelerator Pedal Position Sensor
    • A/C-Cut Control System
    • A/F Heater Relay
    • Circuit Opening Relay
    • EGR Vacuum Switching Valve (VSV)
    • Electronically Controlled Transmission/Transaxle
    • Electronic Spark Advance System
    • EVAP Vacuum Switching Valve (VSV)
    • Fuel Pump
    • Fuel Pump Relay
    • Idle Speed Control System
    • Intake Air Control Valve System
    • Self-Diagnostic System
    • Throttle Control Motor
    • Vapor Pressure Sensor Vacuum Switching Valve (EVAP-VPSVSV)
• Fuel System
  • Fuel Delivery
    • Notes
    • Fuel Pump (Avalon, Camry, Camry Solara, Celica, Corolla, RAV4, Sienna, Tacoma & 4Runner)
    • Fuel Pump (Land Cruiser)
    • Fuel Pump Electronic Control Unit (ECU) & Fuel Pump Switch (Land Cruiser)
    • Fuel Pressure Regulator (Avalon, Camry, Camry Solara, Corolla, RAV4 & Sienna)
    • Fuel Pressure Regulator (Celica, Land Cruiser, Tacoma & 4Runner)
  • Fuel Control
    • Fuel-Cut System (All Models)
    • Fuel Injectors (All Models)
  • Idle Speed
    • A/C-Cut Control System (Camry 2.2L 4-Cyl., Camry Solara 2.2L 4-Cyl., Celica, Corolla & 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, RAV4, Sienna, Tacoma & 4Runner)
    • Throttle Control Motor (Land Cruiser)
    • Throttle Opener (Avalon, Camry, Camry Solara, Celica, RAV4, Sienna, Tacoma & 4Runner)
• Ignition System
  • DISTRIBUTORLESS Ignition System
    • Notes
    • Avalon, Camry 3.0L V6, Camry Solara 3.0L V6 & Sienna
    • Camry 2.2L 4-Cyl., Camry Solara 2.2L 4-Cyl., Corolla & RAV4
    • Land Cruiser
    • Tacoma 2.4L 4-Cyl. & 2.7L 4-Cyl., & 4Runner 2.7L 4-Cyl.
    • Tacoma 3.4L V6 & 4Runner 3.4L V6
  • Distributor Type Ignition System
    • Notes
    • Celica
• Emission Systems
  • Exhaust Gas RECIRCULATION (EGR) System
    • Avalon, Camry 3.0L V6 & Camry Solara 3.0L V6
    • Camry 2.2L 4-Cyl., Camry Solara 2.2L 4-Cyl., Celica, RAV4, Tacoma 2.4L 4-Cyl. & 2.7L 4-Cyl., & 4Runner 2.7L 4-Cyl.
  • Evaporative Emission (EVAP) System
  • On-Board Refilling Vapor Recovery (ORVR) System
    • Avalon, Camry, Camry Solara, Celica & Corolla
  • Positive Crankcase Ventilation
• Self-Diagnostic System
• Miscellaneous Controls
  • Notes
  • Transmission/Transaxle Controls
    • Notes
    • Electronically Controlled Transmission/Transaxle (ECT)