Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSTOYOTA2004MATRIX XR, FWD, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 12 (ENGINE CONTROLS - THEORY & OPERATION)
2004 Toyota Matrix XR, FWD, Standard
Section 12 (Engine Controls - Theory & Operation)
2004 Toyota Matrix XR, FWD, StandardSECTION Section 12 (Engine Controls - Theory & Operation)
WARNING: This page does not describe the selected car, but rather 16 other vehicles, including the 2002 Toyota Tundra, 2002 Toyota Tacoma, 2002 Toyota Sienna, 2002 Toyota Sequoia, and 2002 Toyota RAV4. However, it is still accessible from the selected car via links, so may be relevant.
- 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, Camry Solara 2.4L 4-Cyl., Land Cruiser, MR2 With Sequential Manual Transaxle, Sequoia, 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, 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 & 4Runner)
- 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)
- 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, MR2, RAV4, Sequoia, Sienna, Tacoma, Tundra With A/T & 4Runner)
- 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 3.0L V6 & Camry Solara 3.0L V6)
- Camshaft & Crankshaft Position Sensors (Celica, Corolla, ECHO, Highlander 2.4L 4-Cyl., MR2, Prius & RAV4)
- Camshaft & Crankshaft Position Sensors (Land Cruiser & Sequoia)
- 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 & 4Runner)
- Camshaft & Crankshaft Position Sensors (Tundra 4.7L V8)
- Center Air Bag Sensor Assembly (Celica, Corolla, Highlander, MR2, RAV4, Sequoia & Sienna)
- Center Air Bag Sensor Assembly (Prius)
- EGR Gas Temperature Sensor (Camry 3.0L V6, 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 & 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)
- Engine Coolant Temperature Sensor (All Models)
- Engine Cranking Signal (Avalon, Camry, Camry Solara, Celica, Corolla, ECHO, Highlander, Land Cruiser, MR2, RAV4, Sequoia, Sienna, Tacoma, Tundra & 4Runner)
- 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, Land Cruiser, Sequoia, Sienna & Tundra 4.7L V8)
- Knock Sensor (Camry 2.4L 4-Cyl., Camry Solara 2.4L 4-Cyl., Celica, Corolla, ECHO, Highlander 2.4L 4-Cyl., MR2, Prius, RAV4 & Tacoma 2.4L 4-Cyl. & 2.7L 4-Cyl.)
- Knock Sensor (Tacoma 3.4L V6, Tundra 3.4L V6 & 4Runner)
- Park/Neutral Position Switch (Avalon, Camry, Camry Solara, Celica, Corolla, ECHO, Highlander, Land Cruiser, 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, RAV4, Sienna, Tacoma, Tundra 3.4L V6 & 4Runner)
- Temperature Control Switch (ECHO)
- Throttle Position Sensor (Avalon, Camry Solara 3.0L V6, Celica, Corolla, ECHO, Highlander, MR2 With Standard Type Manual Transaxle, RAV4, Sienna, Tacoma & Tundra 3.4L V6)
- Throttle Position Sensor (Camry, Camry Solara 2.4L 4-Cyl., 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, 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 (Celica, Corolla, ECHO, Highlander 2.4L 4-Cyl., MR2, Prius & RAV4)
- 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, 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
- Notes
- Accelerator Pedal Position Sensor
- Acoustic Control Induction System
- Acoustic Control Induction System Vacuum Switching Valve
- Active Control Mount Vacuum Switching Valve
- A/C-Cut Control System
- A/F Heater Relay
- Air Intake Control Valve (AICV) Vacuum Switching Valve (VSV)
- Canister Closed Valve Vacuum Switching Valve
- Circuit Opening Relay
- EGR Vacuum Switching Valve
- Electronically Controlled Transmission/Transaxle
- Electronic Spark Advance System
- EVAP Vacuum Switching Valve
- Fuel Pump
- Fuel Pump Relay
- Hydrocarbon Adsorber Catalyst System Vacuum Switching Valve
- HRT SUB1 Relay
- Idle Speed Control System
- IG2 Relay
- Pressure Switching Valve Vacuum Switching Valve
- Purge Flow Switching Valve Vacuum Switching Valve
- Self-Diagnostic System
- Throttle Control Motor
- Vapor Pressure Sensor Vacuum Switching Valve
- Variable Valve Lift Oil Control Valve
- Variable Valve Timing Camshaft Timing Oil Control Valve
- Fuel Systems
- Fuel Delivery
- A/F Heater Relay (Avalon, Camry 3.0L V6, Camry Solara 3.0L V6 With A/T, Highlander & Sienna)
- A/F Heater Relay (RAV4)
- Circuit Opening Relay (Avalon)
- Circuit Opening Relay (Camry)
- Circuit Opening Relay (Camry Solara & Highlander)
- Circuit Opening Relay (Celica, ECHO & Prius)
- Circuit Opening Relay (Corolla)
- 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)
- 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, MR2, Prius, RAV4, Sienna, Tacoma, Tundra 3.4L V6 & 4Runner)
- Fuel Pump (Land Cruiser)
- Fuel Pump (Sequoia & Tundra 4.7L V8)
- Fuel Pump Electronic Control Unit & Fuel Pump Switch (Land Cruiser)
- Fuel Pump Relay & Fuel Pump Resistor (Sequoia & Tundra 4.7L V8)
- Fuel Pressure Regulator (Avalon, Camry, Camry Solara, Celica, Corolla, ECHO, Highlander, 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 (Corolla, Highlander, MR2, Prius & RAV4)
- Dashpot (Tacoma 3.4L V6 With M/T)
- Idle Speed Control System (Avalon, Camry Solara 3.0L V6, Celica, Corolla, ECHO, Highlander, MR2 With Standard Type Manual Transaxle, RAV4, Sienna, Tacoma & Tundra 3.4L V6)
- Throttle Control Motor (Camry, Camry Solara 2.4L 4-Cyl., Land Cruiser, Prius, Sequoia, Tundra 4.7L V8 & 4Runner)
- Throttle Control Motor (MR2 With Sequential Manual Transaxle)
- Throttle Opener (Avalon, Camry Solara 3.0L V6, Sienna, Tacoma & Tundra 3.4L V6)
- Fuel Delivery
- Ignition Systems
- Emission Systems & Sub-Systems
- Self-Diagnostic Systems
- Variable Valve Lift System
- Variable Valve Timing System
- Miscellaneous Controls
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.