The Engine Control Modules or ECMs of today are highly advanced and efficient at testing the diverse systems that influence emissions. If you wish to create your own tests then you should first of all understand how the ECM performs. If the repairs do not meet the standards set by the ECM, the code will return to you. In this article, we will discuss about the different types of ECM testing methods to help you detect the problems and serve your customers better.
There are basically three different types of ECM testing methods and you can check the code description to understand which of the three tests were used. Circuit interesting test is the first method wherein the ECM makes sure all the components and their wiring are in perfect working condition.
Rationality test is the second type of ECM testing method in which the ECM compares the information provided by the two sensors to make sure that there's a perfect balance between them.
Functional test is the third type of ECM testing and in this method, the engine control modules checks to see whether or not the expected changes take place when the components are working. Common examples of this type of test are the EVAP purge operational codes and EGR flow codes.
Both rationality and functionality tests can be performed in a passive or intrusive way. Testing in a passive manner means that ECM checks the component or system during their standard operating conditions. Testing in an intrusive manner implies that ECM alters the working conditions of the component or system to check if it is in the perfect condition.
You can read the code setting provided in your service information system to get an idea about the kind of test you are dealing with - passive or intrusive. Delta Pressure Feedback sensor or DPFE used in the Ford EGR systems is a type of passive ECM test. Some of the Chrysler EGR systems have been intrusively tested by ECM.
If the tests done by the ECM don't run successfully, it will make a note regarding the failure and once again check the system to identify the fault. As we know that ECM test comprises of two trip codes, this initial test makes for only the first trip code. If the test performed by ECM fails once again, the Engine Control Module will turn on the MIL light and store the information.
Alternatively, if the fault does not repeat itself when the second ECM test is performed, the first fault detection information will be removed by the memory of ECM. Hence, it is not recommended to take your vehicle for a test drive after the MIL light illuminates. You should thoroughly check all the components and make sure that everything is in perfect condition before declaring that the car is fixed.
Having good knowledge about the different types of ECM testing methods can help in several ways. You can personally check the vehicles, diagnose the problems, if any, and save hundred of dollars on repair.
There are basically three different types of ECM testing methods and you can check the code description to understand which of the three tests were used. Circuit interesting test is the first method wherein the ECM makes sure all the components and their wiring are in perfect working condition.
Rationality test is the second type of ECM testing method in which the ECM compares the information provided by the two sensors to make sure that there's a perfect balance between them.
Functional test is the third type of ECM testing and in this method, the engine control modules checks to see whether or not the expected changes take place when the components are working. Common examples of this type of test are the EVAP purge operational codes and EGR flow codes.
Both rationality and functionality tests can be performed in a passive or intrusive way. Testing in a passive manner means that ECM checks the component or system during their standard operating conditions. Testing in an intrusive manner implies that ECM alters the working conditions of the component or system to check if it is in the perfect condition.
You can read the code setting provided in your service information system to get an idea about the kind of test you are dealing with - passive or intrusive. Delta Pressure Feedback sensor or DPFE used in the Ford EGR systems is a type of passive ECM test. Some of the Chrysler EGR systems have been intrusively tested by ECM.
If the tests done by the ECM don't run successfully, it will make a note regarding the failure and once again check the system to identify the fault. As we know that ECM test comprises of two trip codes, this initial test makes for only the first trip code. If the test performed by ECM fails once again, the Engine Control Module will turn on the MIL light and store the information.
Alternatively, if the fault does not repeat itself when the second ECM test is performed, the first fault detection information will be removed by the memory of ECM. Hence, it is not recommended to take your vehicle for a test drive after the MIL light illuminates. You should thoroughly check all the components and make sure that everything is in perfect condition before declaring that the car is fixed.
Having good knowledge about the different types of ECM testing methods can help in several ways. You can personally check the vehicles, diagnose the problems, if any, and save hundred of dollars on repair.
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