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© 200438 2-3 System inspection with DAVIE XD AS TRONIC DAVIE XD diagnostics manual 3 2.3 'CLUTCH ACTUATOR' MENU This test provides an indication of the performance of the clutch/clutch actuator, and can best be carried out on a moving vehicle. The "absolute clutch stroke" is the clutch stroke from a fully closed to a fully opened position, expressed in mm. The "relative clutch stroke" indicates the position of the clutch in % instead of mm. The "clutch status" indicates whether at that moment the clutch is "opened" or "closed" or whether the clutch "slips". The above measurements are closely connected. For instance, the clutch position "closed" is expressed in mm and %. A closed clutch gives a relative clutch stroke of 100% in a position between 37 and 60 mm. An opened clutch gives a relative clutch stroke of about 0% in a position between 18 and 40 mm. The clutch position sensor in the clutch actuator measures the distance from a fully closed to a fully opened clutch. Example: Clutch position/stroke: fully closed (100%) = 37 mm fully opened (approx. 0%) = 18 mm Difference (clutch stroke) = approx. 19 mm The position of clutch operation components changes during the service life of the clutch plate. For this reason the clutch stroke of approx. 19 mm will move along the "operating range" of the clutch actuator. This is visible by the changing clutch position (in mm) of the opened and closed clutch. The "absolute change-over" is the point at which the clutch "engages"; depending on tolerances and wear this point is between 12 and 45 mm. If the accelerator pedal is not operated, the "low idling switch" is active. A number of situations are shown by way of example: Neutral speed in" and "input shaft speed" have to be virtually equal. With a closed clutch the "relative clutch stroke" is 100%; also, the "clutch status" indicates that the clutch is closed. If the accelerator pedal is not operated, the "low idling switch" is active. |