| 摘要 |
The invention relates to a method for diagnosing a failure of the EGR circuit (3) of an engine including an EGR exchanger (31), an EGR valve (33), a bypass duct (35) of the EGR exchanger, and a so-called bypass flap (32) arranged upstream from the EGR exchanger (31) and the bypass duct (35) in order to adjust the proportion of exhaust gases flowing therethrough, wherein the EGR circuit (3) can be activated according to a cooled mode, in which the flap (32) is shut, or according to a bypass mode in which the flap (32) is open, said method comprising carrying out, during a diagnosis phase, two activations (A1, A2) of the flap (32), and measuring an average of the variations of the EGR gas temperature (TsEGR) at the outlet of the EGR exchanger (31) during the diagnosis phase. |
