Then it calculates how much fuel is required to get you the power you need AND complete burn so you don’t pollute the air. At that point the PCM knows air temp, engine temp, air density and how much power you’re asking for. The powertrain control module (PCM) receives inputs from the engine coolant temp sensor (ECT), the mass airflow sensor (MAF), and the throttle position sensor (TPS). How the air and fuel mixtures are calculated But first you have to understand how the air/fuel and emissions systems work. After the tests you may indeed discover that the catalytic converter is bad. When attach a trouble code reader and come up with a P0420, your first assumption may be that you need a new catalytic converter, simply because the words catalytic converter are mentioned in the code. Repair Topics > Computers and Sensors > How to fix Code P0420 How to fix Code P0420 What is code P0420 Catalyst System Efficiency Below Threshold
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