They are powered by either vacuum or electricity. There are two basic designs of the valves. Let us discuss the EGR valve and how it functions from a generic point of view. Either through monitoring of the system through normal operations or as a test of the systems functions as part of a self-diagnostic test. These codes are the results of commands issued by the PCM for one of two purposes. P0401 indicates low or no flow of exhaust gases, while P0402 indicates the Powertrain Control Module (PCM) has detected excessive flow of exhaust gases. These two DTCs are opposite sides of the ‘same coin’ to use an old saying. These exhaust gases are recirculated into the engine to lower combustion temperatures to reduce and or eliminate spark knock. Specifically they identify problems that have been detected in the flow rates of the exhaust gasses back into the engine. P0401 and P0402 Diagnostic Trouble Codes (DTC) relate to the Exhaust Gas Recirculation (EGR) system in vehicles.
0 kommentar(er)
