Catalytic converter test on gasoline vehicles

Hello friends, In this article I will try to explain to you how to test whether the catalytic converter is defective in gasoline vehicles. In our vehicle, there is an oxygen sensor at the output of a catalytic converter. 1. Oxygen Sensor at the Inlet The rough function of the oxygen sensor is to measure the amount of oxygen in the exhaust gas and send it to the ECU. The picture below shows the oxygen sensor on the left and the electrical signal it produces on the right. The ECU adjusts the fuel-air mixture radiated by processing this signal. If the mixture is rich, the Oxygen sensor produces values between 0.6 Volts and 0.9 Volts. If the mixture is poor, the Oxygen sensor produces values between 0.1 Volts and 0.3 Volts. The oxygen sensor contains a heater for it to function properly and generate a signal, which allows the sensor to reach a temperature of more than 350 degrees in 15 seconds. This heater operates and controlled by the square wave signal produced by the ECU. If the exhaust gas is above 800 degrees, the oxygen sensor is not checked yet. In two cases, the ECU does not use the signal from the oxygen sensor, i.e. ignore it. 1. When the engine is cold (engine temperature below 20 degrees) 2. When the engine is loaded. 2. Output Oxygen Sensor This sensor is completely installed in the vehicle to fulfill the EOBD (European On Board Diagnosis) specifications of the vehicle. It is placed at the output of the catalytic converter and its purpose is to measure how effectively the catalytic converter works. It is exactly the same as the oxygen sensor at the entrance. The task of this oxygen sensor is the amount of oxygen contained in the exhaust gas after it has been filtered in the catalytic converter. Since the exhaust gas reaches this sensor after passing to the catalytic converter, the signal produced by this sensor is connected with the signal produced by the other sensor. Since chemical reactions are working correctly in a new catalytic converter, the output oxygen sensor generates between 0.5 and 0.7 volts in theory due to the low amount of oxygen (when the engine is hot). However, even if the catalytic converter is new, there is practically a fluctuation in this value. Over time, with the decrease of the life of the catalytic converter, it completely deteriorates. Two graphs are given below. The first one was taken from a properly working and in good working catalytic converter. The red wavy line number 8 seen here comes from the oxygen sensor at the input and it is natural to follow a wavy structure. Because the amount of oxygen in the exhaust gas is not always the same. The number 9 green line comes from the oxygen sensor and should have a relatively flat structure. Because the exhaust gas is filtered in the catalytic converter. In the second graph, this green, that is, the output oxygen sensor, follows the data in the oxygen sensor at the input. In this case, it is understood that the catalytic converter does not work occasionally and transmits the incoming gas to the outlet. Data in the graphs: t = timeU = voltage6 = when the catalytic converter is in good condition7 = data when the catalytic converter is broken8 = data from the oxygen sensor at the input9 = data from the oxygen sensor of the output. These data can be accessed and tested with the PP2000 (Peugeot Planet) diagnostic device. Source: BOSCH ME7.4.4 / M7.4.4 Technical Training DocumentKoliva koliva2011-12-06 16:03:50

thanks.

This pp200 is a very nice tool, but unfortunately it is not everywhere, it is not.

nice sharing, thanks. I think it would be nice, if you are curious, if you like research, you will learn from a to z and you will be aware of the health of the vehicle. albayman 2011-12-04 14:42:49

[QUOTE = colonel] nice sharing, thank you. How much does the cable socket with the I think it would be nice, if you are curious, if you like research, you will learn from a to z and you will be aware of the vehicle's health.

Good health work to your hand. The folks canceled the katalik and use it so they got it from eco (brain) just what they are doing?

My fault light was on, they said LPG is normal, I have been driving in gas for 1 month, he was doing it in the air, he stopped burning when he changed the air filter. > it meant that a malfunction had been said correctly & nbsp; Thanks for sharing & nbsp; ÜÇyüzaltı 2011-12-04 20:58:25

thanks for sharing

1000 2000 for more than $ & nbsp in Turkey;

[QUOTE = djchaos] 1000 2000 for more than $ & nbsp in turkey; [/ QUOTE] So get
, does anybody want to use? If there is any special message, I can make it easier.

Nice sharing. You have made it again

how many gaymas? albayman 2011-12-05 18:52:20

Thanks for the information Koliva; I have pp2000, from which menu can we reach these values, can you inform us?

[QUOTE = junker] Koliva thanks for the info; I have pp2000, from which menu can we reach these values, can you inform us? [/ QUOTE]

Exactly what I have in my mind right now is what menu they are on. Next time I take screenshots but I don't know when I can. But if you have a problem with your vehicle, I can take a moment to look at it.

[QUOTE = koliva] [QUOTE = junker] Thanks for the information; I have pp2000, from which menu can we reach these values, can you inform us? [/ QUOTE]

Exactly what I have in my mind right now is what menu they are on. Next time I take screenshots but I don't know when I can. But if you have a problem with your vehicle, I can take a moment to look at it.
[/ QUOTE]

Thank you very much for your attention. There is no problem in my car right now, but when I read your article, I was curious and wanted to look at it, I think I will be tampered when I have free time in the parameters under the engine brain?

[QUOTE = junker]
Thank you very much for your attention. There is no problem in my vehicle right now, but when I read your article, I wondered and wanted to look, I think I will be tampered with when I have free time, I think it is in the parameters under the engine brain?
[/ QUOTE]

I think it should be in the ECU parameters. Because the O2 sensor is not BSI connected to the ECU. However, as I said, it is necessary to tamper with

[QUOTE = koliva] [QUOTE = junker]
Thank you very much for your attention. There is no problem in my vehicle right now, but when I read your article, I wondered and wanted to look, I think I will be tampered with when I have free time, I think it is in the parameters under the engine brain?
[/ QUOTE]

I think it should be in the ECU parameters. Because the O2 sensor is not BSI connected to the ECU. But as I said, I need to tamper

[/ QUOTE]

me I meant ecu, brother, the Turkish version of the ecu is referred to as the brain of the engine, but we also removed the catalytic converter to disassemble the transmission, but the output was going directly to the exhaust, as if I could not see the sensor at the output? Reviews

I wonder my landa sensor, where the o2 sensor air excess coefficient on this catalytic converter is set. we saw it in power generation systems.

[QUOTE = mon] wonder my landa sensor where the o2 sensor air excess coefficient on this catalytic converter is set. we have seen it in power generation systems lesson. [/ QUOTE]

Yes it's true the sensor you are talking about is this sensor
koliva 2011-12-06 15:58:19