DME 7.8 DME 7.80 · Figure 1:

DME 7.8 DME 7.80 Figure 1: Figure 2: 20V DC 1:1 1 - Voltage not applied yet, valve in output state 2 - Exponential voltage increase, magnetic field is built up, 1 2 3 4 increase of the spring preload force 3 - Valve starts to move, spring force increases, valve reaches end position 4 - Exponential voltage increase, current limitation through self- induction of the coil 5ms/DIV 174 Camshaft Adjustment, Bank 1 – Above Limit Diagnosis conditions • Time elapsed after start-up greater than 5 seconds • Engine temperature greater than -10 °C • Engine speed between 680 rpm and 6.760 rpm • No fault in camshaft adjustment output stage • Reference mark OK • No fault in camshaft position sensors • No fault in engine temperature Possible fault cause Note! Solenoid hydraulic valve is not triggered, camshaft does not switch into late position 0-151 page 4 1536 P1341 p1341 Printed in Germany – 4, 2002