![]() The PCM can initiate the catalyst monitor when the engine is operating normally at steady highway speeds. In order for the catalyst monitor to be activated by the PCM, the check engine light must be turned off and the continuous monitors, including the oxygen sensor monitor, must have been successfully completed. If the catalytic converter is not functioning properly, the PCM (powertrain control module) will activate the check engine light to alert the driver. ![]() If the downstream sensor reading is fluctuating in a similar way to the front sensor, it means that the catalytic converter is not functioning properly and may be allowing emissions to exceed the federal certification limit by 1.5 times. The downstream oxygen sensor, which is located at the outlet of the catalytic converter, measures the oxygen content of the exhaust gas after it has passed through the catalytic converter. The sensor produces a voltage signal that oscillates in response to these oxygen pulses. The catalyst monitor also uses an upstream oxygen sensor during closed-loop fuel control to measure the oxygen content in the exhaust gas by detecting oxygen pulses produced by each cylinder’s combustion event. If the converter is functioning properly, there should be a small amount of unburned oxygen in the exhaust. It compares the readings from upstream and downstream oxygen sensors to determine the converter’s efficiency. The monitor uses the PCM (powertrain control module) to measure the oxygen entering and leaving the catalytic converter under normal operating conditions. The catalyst motor takes the Oxygen from the exhaust gas and uses it for the breakdown of pollutants. In this case, the catalyst monitor will trigger a warning on the dashboard, usually in the form of a “Catalyst Monitor: Incomplete” message. If the ratio of these gasses is not within the proper range, it may indicate that the catalytic converter is not functioning properly. ![]() It compares the levels of exhaust gasses and oxygen in the exhaust to ensure the catalytic converter is working properly and meeting emissions standards. The catalytic converter is a component of the exhaust system that converts pollutants into less harmful substances. Here’s what you need to know about this issue and how to fix it:Ī catalyst monitor is a diagnostic tool that checks the efficiency of a car’s catalytic converter in reducing emissions. Sometimes, the diagnostic system may indicate “Catalyst Monitor Incomplete” which indicates the testing hasn’t taken place. While the former keep operating as long as the engine is turned on, the latter requires certain conditions to be met, like speed, acceleration, ambient, fuel level, and more, to be able to proceed with the testing process.Ĭatalyst monitor falls in the non-continuous category and analyses your catalytic converter’s ability to reduce the emission of harmful gases. There are two types of monitors in modern vehicles: continuous and non-continuous. This process is monitored and regulated by the onboard diagnostic system (OBDII) which consists of monitors that track the vehicle’s performance. When working as intended, the oxygen from the exhaust gas is used to clean up pollutants and other harmful components in the exhaust. The catalytic monitor measures the ability of your vehicle’s catalyst converter to reduce harmful emissions. When you buy through links on our site, we may earn an affiliate commission. "This photo" by Noricum is licensed under CC BY-SA 2.0Ĭargroot is reader-supported.
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