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.
System Description: Description
The exhaust treatment function reduces the following exhaust emissions included in exhaust gas.
- Nitrogen oxide (NOx)
- Carbon hydrate
- Carbon monoxide
To reduce exhaust emissions, it is necessary to quickly raise catalyst temperature to the operating temperature especially when performing cold start.
ECM controls the solenoid actuators of intake camshaft and exhaust camshaft and determines valve overlap. Exhaust gas recirculation rate is controlled by interior EGR.
The exhaust treatment function has a control item and functions as follows.
- Three way catalyst function
- Shift performance curve control
- Catalyst efficiency monitor function
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.
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