The engine control module (ECM) is the computer that manages every system on the vehicle related to emissions. What does the ECM do, and how does it do it? And when the next step tells you to replace the engine control module, there is always some hesitation, isn’t there? After all, a new ECM can cost a lot of money and you want to be sure that replacing it is going to resolve your customer’s concern. The "20/20" rule can help you with initial scope set upĮver use an OEM flow chart as part of your driveability diagnostic process? I’m betting you have.Often software malfunctions are corrected through re-programming. ![]() Scan data can be too slow to capture a glitch the scope can reveal the fault.
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