![]() These bad commands are usually based on sensors that have drifted. A vehicle can pass all of these tests and still have too much or too little EGR because of improper PCM commands. Most service information is limited to testing individual components and passages, and verifying that the PCM is capable of opening the EGR valve. In fact, inappropriate EGR commands are more common than faulty air/fuel mixture commands. If the computer is providing any EGR commands at all, it’s easy to assume they’re appropriate. ![]() They may be comfortable testing individual EGR system components, but it can be difficult to determine if the powertrain control module (PCM) is controlling EGR properly. ![]() ![]() Many technicians feel pretty comfortable diagnosing fuel control problems in modern computer-controlled automobiles, but exhaust gas recirculation (EGR) is another story. ![]()
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March 2023
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