Engine Controls - Theory & Operation
- Introduction
- Service Precautions
- Air Induction Systems
- Computerized Engine Controls
- Engine Control System
- Engine Immobilizer System
- Engine Control Module
- Hybrid Vehicle Control Electronic Control Unit
- Input Devices
- Notes
- Accelerator Pedal Position Sensor (Camry 2.4L (Including PZEV), Camry Solara 2.4L 4-Cyl., Camry 3.0L V6, Land Cruiser, MR2 With Sequential Manual Transaxle, Sequoia, Tacoma 3.4L V6 (W/ETCS), Tundra 4.7L V8 & 4Runner)
- Accelerator Pedal Position Sensor (Prius)
- A/C Compressor Lock Sensor (Camry)
- A/C Compressor Lock Sensor (Camry Solara 2.4L 4-Cyl. With Manual A/C, Celica, Highlander, MR2 & RAV4)
- A/C Evaporator Temperature Sensor (Camry 2.4L 4-Cyl. With Manual A/C & Camry Solara 2.4L 4-Cyl. With Manual A/C)
- A/C Switch (Avalon, Camry, Camry Solara, Celica, Corolla, ECHO, Matrix, MR2, RAV4, Sequoia, Sienna, Tacoma, Tundra & 4Runner)
- Air/Fuel Sensor (Avalon, Camry, Camry Solara 2.4L 4-Cyl., Camry Solara 3.0L V6 With A/T, Highlander, RAV4, Sienna, Tacoma & Tundra 3.4L V6)
- Airflow Meter (All Models)
- Battery Signal (Avalon, Camry, Camry Solara, Celica, ECHO, Highlander, MR2, Prius, RAV4, Sienna, Tacoma, Tundra 3.4L V6 & 4Runner)
- Battery Signal (Corolla & Matrix)
- Battery Signal (Land Cruiser)
- Battery Signal (Sequoia & Tundra 4.7L V8)
- Brakelight Signal (Avalon, Camry, Camry Solara 2.4L 4-Cyl., Camry Solara 3.0L V6 With A/T, Celica With A/T, Corolla With 4-Speed A/T, ECHO With A/T, Highlander, Land Cruiser, Matrix With A/T, MR2, RAV4, Sequoia, Sienna, Tacoma, Tundra With A/T & 4Runner)
- Camshaft & Crankshaft Position Sensors (All 4.7L V8)
- Camshaft & Crankshaft Position Sensors (Avalon, Highlander 3.0L V6 & Sienna)
- Camshaft & Crankshaft Position Sensors (Camry 2.4L 4-Cyl. & Camry Solara 2.4L 4-Cyl.)
- Camshaft & Crankshaft Position Sensors (Camry 3.0LV6 (To 1-03 Production) & Camry Solara 3.0L V6)
- Camshaft & Crankshaft Position Sensors (Camry 3.0LV6 (1-03 To 8-03 Production) & Camry Solara 3.0L V6)
- Camshaft & Crankshaft Position Sensors (Celica, Corolla, ECHO, Highlander 2.4L 4-Cyl., Matrix, MR2, Prius & RAV4)
- Camshaft & Crankshaft Position Sensors (Tacoma 2.4L 4-Cyl. & 2.7L 4-Cyl.)
- Camshaft & Crankshaft Position Sensors (Tacoma 3.4L V6 &Tundra 3.4L V6)
- Camshaft & Crankshaft Position Sensors (4Runner 4.0L V6)
- Center Air Bag Sensor Assembly (Celica, Corolla, ECHO, Highlander, Land Cruiser, Matrix, MR2, RAV4, Sequoia, Sienna, Tundra & 4Runner)
- Center Air Bag Sensor Assembly (Prius)
- EGR Gas Temperature Sensor (Camry 3.0L V6 (To 1-03 Production), Camry Solara 3.0L V6 & Tacoma 2.7L 4-Cyl. 3RZ-FE)
- EGR Position Sensor (Camry 3.0L V6 & Camry Solara 3.0L V6)
- Electrical Load Signal (Avalon, Camry, Camry Solara, Corolla, Matrix & Sienna)
- Electrical Load Signal (ECHO)
- Electrical Load Signal (Land Cruiser, RAV4, Sequoia, Tacoma 2.4L 4-Cyl. & 2.7L 4-Cyl., Tundra 4.7L V8 & 4Runner)
- Engine Coolant Temperature Sensor (All Models)
- Engine Cranking Signal (All Models)
- Heated Oxygen Sensor (All Models)
- Intake Air Temperature Sensor (All Models)
- Knock Sensor (Avalon, Camry 3.0L V6, Camry Solara 3.0L V6, Highlander 3.0L V6 & Sienna)
- Knock Sensor (Camry 2.4L 4-Cyl., Camry Solara 2.4L 4-Cyl., Celica, Corolla, ECHO, Highlander 2.4L 4-Cyl., Matrix, MR2, Prius, RAV4 & Tacoma 2.4L 4-Cyl. & 2.7L 4-Cyl.)
- Knock Sensor (Land Cruiser, Sequoia, Tacoma 3.4L V6, Tundra & 4Runner)
- Park/Neutral Position Switch (Avalon, Camry, Camry Solara, Celica, Corolla, ECHO, Highlander, Land Cruiser, Matrix, RAV4, Sequoia, Sienna, Tacoma, Tundra & 4Runner)
- Park/Neutral Position Switch (Prius)
- Power Steering Pressure Sensor (ECHO)
- Power Steering Pressure Switch (Avalon, Camry, Camry Solara, Celica, Corolla, Highlander, Matrix, RAV4, Sienna, Tacoma, Tundra 3.4L V6 & 4Runner)
- Temperature Control Switch (ECHO)
- Throttle Position Sensor (Avalon, Camry Solara 3.0L V6, Celica (1ZZ-FE Engine), Corolla, ECHO, Highlander, Matrix, MR2 With Standard Type Manual Transaxle, RAV4, Sienna, Tacoma (W/Out ETCS) & Tundra 3.4L V6)
- Throttle Position Sensor (Camry 2.4L 4-Cyl. (Including PZEV), Camry Solara 2.4L 4-Cyl., Celica (2ZZ-GE Engine), Land Cruiser, MR2 With Sequential Manual Transaxle, Prius, Sequoia, Tundra 4.7L V8 & 4Runner)
- Vacuum Sensor For Hydrocarbon Adsorber Catalyst System (Prius)
- Vapor Pressure Sensor (Avalon, Camry, Camry Solara, Celica, Corolla, Highlander, Matrix, MR2, RAV4, Sequoia, Sienna, Tacoma & 4Runner)
- Vapor Pressure Sensor (ECHO)
- Vapor Pressure Sensor (Land Cruiser & Tundra)
- Vapor Pressure Sensor (Prius)
- Variable Valve Timing Sensor (Avalon, Highlander 3.0L V6 & Sienna)
- Variable Valve Timing Sensor (Camry 2.4L 4-Cyl. & Camry Solara 2.4L 4-Cyl.)
- Variable Valve Timing Sensor (Camry 3.0L V6 (1-03 To 8-03 Production) & Camry Solara 3.0L V6
- Variable Valve Timing Sensor (Celica, Corolla, ECHO, Highlander 2.4L 4-Cyl., Matrix, MR2, Prius & RAV4)
- Variable Valve Timing Sensor (4Runner 4.0L V6)
- Vehicle Speed Sensor (Avalon)
- Vehicle Speed Sensor (Camry 2.4L 4-Cyl.)
- Vehicle Speed Sensor (Camry 3.0L V6)
- Vehicle Speed Sensor (Camry Solara, Celica, Corolla, ECHO, Land Cruiser, Matrix, RAV4, Sequoia, Tacoma & Tundra)
- Vehicle Speed Sensor (Highlander)
- Vehicle Speed Sensor (MR2)
- Vehicle Speed Sensor (Prius)
- Vehicle Speed Sensor (Sienna)
- Vehicle Speed Sensor (4Runner)
- 4WD Input (Land Cruiser, Sequoia, Tacoma, Tundra & 4Runner)
- Output Signals
- Fuel Systems
- Fuel Delivery
- A/F Heater Relay (Avalon, Camry, Camry Solara, Highlander & Sienna)
- A/F Heater Relay (RAV4, Tacoma, Tundra 3.4L V6)
- Circuit Opening Relay (Avalon)
- Circuit Opening Relay (Camry)
- Circuit Opening Relay (Camry Solara & Highlander)
- Circuit Opening Relay (Celica, ECHO & Prius)
- Circuit Opening Relay (Corolla & Matrix)
- Circuit Opening Relay (Land Cruiser)
- Circuit Opening Relay (MR2)
- Circuit Opening Relay (RAV4)
- Circuit Opening Relay (Sequoia)
- Circuit Opening Relay (Sienna & 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 & Camry Solara)
- EFI Main Relay (Celica)
- EFI Main Relay (Corolla & Matrix)
- EFI Main Relay (ECHO)
- EFI Main Relay (Highlander)
- EFI Main Relay (Land Cruiser)
- EFI Main Relay (MR2)
- EFI Main Relay (Prius)
- EFI Main Relay (RAV4)
- EFI Main Relay (Sequoia)
- 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)
- Fuel Pump (Avalon, Camry, Camry Solara, Celica, Corolla, ECHO, Highlander, Matrix, MR2, Prius, RAV4, Sienna, Tacoma, Tundra 3.4L V6 & 4Runner)
- Fuel Pump (Land Cruiser, Sequoia & Tundra 4.7L V8)
- Fuel Pump Relay & Fuel Pump Resistor (Land Cruiser, Sequoia & Tundra 4.7L V8)
- Fuel Pressure Regulator (Avalon, Camry, Camry Solara, Celica, Corolla, ECHO, Highlander, Matrix, MR2, Prius, RAV4 & Sienna)
- Fuel Pressure Regulator (Land Cruiser, Sequoia, Tacoma & Tundra)
- IG2 Relay (Avalon, Celica, MR2, Prius & RAV4)
- Fuel Control
- Idle Speed
- A/C-Cut Control System
- Dashpot (Tacoma 3.4L V6 With M/T)
- Idle Speed Control System (Avalon, Camry Solara 3.0L V6, Celica (1ZZ-FE Engine), Corolla, ECHO, Highlander, Matrix, MR2 With Standard Type Manual Transaxle, RAV4, Sienna, Tacoma & Tundra 3.4L V6)
- Throttle Control Motor (Camry, Camry Solara 2.4L 4-Cyl., Celica (2ZZ-GE Engine), Land Cruiser, Prius, Sequoia, Tacoma 3.4L V6 W/ ETCS, Tundra 4.7L V8 & 4Runner)
- Throttle Control Motor (MR2 With Sequential Manual Transaxle)
- Throttle Opener (Avalon, Camry Solara 3.0L V6, Sienna, Tacoma (W/O ETCS) & Tundra 3.4L V6)
- Ignition Systems
- DISTRIBUTORLESS Ignition System
- Notes
- Avalon, Highlander 3.0L V6 & Sienna
- Camry 2.4L 4-Cyl., Camry Solara 2.4L 4-Cyl., Celica, Corolla, ECHO, Highlander 2.4L 4-Cyl., Matrix, MR2, Prius & RAV4
- Camry 3.0L V6
- Camry Solara 3.0L V6
- Land Cruiser, Sequoia, Tundra 4.7L V8 & 4Runner 4.7L V8
- Tacoma 2.4L 4-Cyl. & 2.7L 4-Cyl.
- Tacoma 3.4L V6 & Tundra 3.4L V6
- 4Runner 4.0L V6
- Emission Systems & Sub-Systems
- Exhaust Gas RECIRCULATION Control
- Hydrocarbon Adsorptive Catalyst System
- Fuel Evaporative System
- Notes
- Avalon, Camry (Except PZEV), Camry Solara, Celica, Corolla, Highlander, Matrix, MR2, RAV4, Sienna & Tacoma
- Camry (PZEV)
- Echo
- Land Cruiser, Sequoia, Tundra & 4Runner V8
- Prius
- 4Runner 4.0L V6
- On-Board Refilling Vapor Recovery System
- Avalon, Camry (Except PZEV), Camry Solara, Celica, Corolla, ECHO, Highlander, Matrix, MR2, Prius, RAV4, Sequoia, Sienna & Tacoma
- Camry (PZEV) & 4Runner 4.0L V6
- Positive Crankcase Ventilation
- Self-Diagnostic Systems
- Variable Valve Lift System
- Variable Valve Timing System
- Miscellaneous Controls