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Engine Controls - System & Component Testing - 4-Cylinder Expand All (for easy ctrl-f) Collapse All Introduction Service Precautions Air Induction Systems Computerized Engine Controls Engine Sensors & Switches Modules, Motors, Relays & Solenoids Fuel Systems Fuel System Pressure Release Fuel Delivery Circuit Opening Relay EFI Main Relay Fuel Pressure Regulator (Camry CNG Models) Fuel Pressure Regulator Fuel Shutoff Valve (Camry CNG Models) Fuel Pump Pressure (Camry Gasoline Models, Camry Solara, Celica, Corolla, ECHO, Highlander, MR2, Prius, RAV4 & Tacoma) Fuel Pump Resistance & Operation (Camry Gasoline Models, Camry Solara, Celica, Corolla, ECHO, Highlander, MR2, Prius, RAV4 & Tacoma) Fuel Rail Fuel Shutoff Valve (Camry CNG Models) Fuel Tank Fuel Shutoff Valve (Camry CNG Models) Fuel Control Fuel Injectors (Camry CNG Models) Fuel Injectors (Camry Gasoline Models & Camry Solara) Fuel Injectors (Celica, Corolla, ECHO, Highlander, MR2, Prius & RAV4) Fuel Injectors (Tacoma) Fuel Cut System (Camry CNG & Gasoline Models, Camry Solara, Celica, Corolla, ECHO, MR2, RAV4 & Tacoma) Fuel Cut System (Highlander) Fuel Cut System (Prius) Idle Control Systems Ignition Systems Emission Systems & Sub-Systems Notes Exhaust Gas RECIRCULATION System Hydrocarbon Absorber Catalyst System Fuel Evaporative System Notes Fuel EVAP System Test (Camry Gasoline Models, Camry Solara, Celica, Corolla, MR2 & RAV4) Fuel EVAP System Test (ECHO) Fuel EVAP System Test (Highlander) Fuel EVAP System Test (Prius) Fuel EVAP System Test (Tacoma) Canister Closed Valve Vacuum Switching Valve (Camry Gasoline Models, Camry Solara, Celica, Corolla, ECHO, Highlander, MR2 & RAV4) Canister Closed Valve Vacuum Switching Valve (Prius) Charcoal Canister Cut-Off Valve (Camry Gasoline Models, Camry Solara, Celica, Corolla, ECHO, Highlander, MR2, Prius & RAV4) EVAP Vacuum Switching Valve (Camry Gasoline Models, Camry Solara, Celica, Corolla, ECHO, Highlander, MR2, Prius, RAV4 & Tacoma) Overfill Check Valve (Camry Gasoline Models, Camry Solara, Celica, Corolla, ECHO, Highlander, MR2, Prius & RAV4) Pressure Switching Valve Vacuum Switching Valve (Camry Gasoline Models, Camry Solara, Celica, Corolla, Highlander, MR2 & RAV4) Purge Flow Switching Valve Vacuum Switching Valve (Prius) Vapor Pressure Sensor (Camry Gasoline Models, Camry Solara, Corolla, MR2, RAV4 & Tacoma) Vapor Pressure Sensor (Celica & ECHO) Vapor Pressure Sensor (Highlander) Vapor Pressure Sensor (Prius) Vapor Pressure Sensor Vacuum Switching Valve (Tacoma) Positive Crankcase Ventilation Throttle Controls Variable Valve Lift System Variable Valve Timing System