Method for cleaning a motor vehicle drive unit comprising an internal combustion engine, said method comprising: - reading, by a diagnostic tool connected to the motor vehicle, of faults in the drive unit which may have been reported by a control electronics system of the drive unit during the prior operation of the drive unit and stored, if necessary, in a memory of said control electronics system; - reading, by the diagnostic tool in real time, with the engine turned on, of operating parameters of the drive unit, and establishing a diagnosis relating to the clogging of members of the drive unit according to the faults signalled, if necessary, as well as said operating parameters of the drive unit; - connecting, to the vehicle, a cleaning station of the drive unit by injection of a cleaning fluid, said cleaning station being further connected; - under the control of the diagnostic tool and according to a cleaning procedure which depends on the diagnosis established, cleaning the drive unit by injection, with the engine turned on, of a cleaning fluid in the inlet of the engine by a cleaning station connected to the motor vehicle and connected to the diagnostic tool for the effects of its control by said diagnostic tool, with simultaneous movement, also under the control of the diagnostic tool, of movable members of the drive unit from among the members of said drive unit which are sensitive to clogging; - removal by the diagnostic tool of the faults signalled, if necessary, from the memory of the control electronics system of the drive unit; - learning, after the cleaning operation, by the diagnostic tool, in real time, with the engine turned on, of the effective state of self-adaptive members of the drive unit from among the members of said drive unit which are sensitive to clogging; and - updating by the diagnostic tool, in the control electronics system of the drive unit, of operating parameters of said drive unit normally impacted by the clogging of members of said drive unit which are sensitive to clogging, to take account of the effective state, after the cleaning operation, of the self-adaptive members of the drive unit among the members of said drive unit which are sensitive to clogging. - reading, by a diagnostic tool connected to the motor vehicle, of faults in the drive unit which may have been reported by a control electronics system of the drive unit during the prior operation of the drive unit and stored, if necessary, in a memory of said control electronics system; - reading, by the diagnostic tool in real time, with the engine turned on, of operating parameters of the drive unit, and establishing a diagnosis relating to the clogging of members of the drive unit according to the faults signalled, if necessary, as well as said operating parameters of the drive unit; - connecting, to the vehicle, a cleaning station of the drive unit by injection of a cleaning fluid, said cleaning station being further connected; - under the control of the diagnostic tool and according to a cleaning procedure which depends on the diagnosis established, cleaning the drive unit by injection, with the engine turned on, of a cleaning fluid in the inlet of the engine by a cleaning station connected to the motor vehicle and connected to the diagnostic tool for the effects of its control by said diagnostic tool, with simultaneous movement, also under the control of the diagnostic tool, of movable members of the drive unit from among the members of said drive unit which are sensitive to clogging; - removal by the diagnostic tool of the faults signalled, if necessary, from the memory of the control electronics system of the drive unit; - learning, after the cleaning operation, by the diagnostic tool, in real time, with the engine turned on, of the effective state of self-adaptive members of the drive unit from among the members of said drive unit which are sensitive to clogging; and - updating by the diagnostic tool, in the control electronics system of the drive unit, of operating parameters of said drive unit normally impacted by the clogging of members of said drive unit which are sensitive to clogging, to take account of the effective state, after the cleaning operation, of the self-adaptive members of the drive unit among the members of said drive unit which are sensitive to clogging.