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.
Emission Control System (5VZ-FE): Purpose
The emission control systems are installed to reduce the amount of HC, CO and NOx exhausted from the engine (3 and 4), to prevent the atmospheric release of blow-by gas-containing HC (1) and evaporated fuel containing HC from being released from the fuel tank (2). The function of each system is shown in the table:
| System | Abbreviation | Function | ||
|---|---|---|---|---|
| 1. Positive Crankcase Ventilation | PCV | Reduces HC | ||
| 2. Evaporative Emission Control | EVAP | Reduces evaporated HC | ||
| 3. Three-Way Catalytic Converter | TWC | Reduces HC, CO and NOx | ||
| 4. Sequential Multiport Fuel Injection (1) | SFI | Injects a precisely timed, optimum amount of fuel for reduced exhaust emissions | ||
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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.