3.4 ELECTRONIC MONITORING AND CONTROL SYSTEM ECS OPERATION Menu Control of the E C S The Menu Control is carried out with the Service Keys. (Four control keys and one key switch). QUIT-Key QUI Access to a lower level (-1- = > -2-) Acknowledgement of new oil viscosity RETURN-Key RET Return to previous level (-2- = > -1-) LEFT-Key RIGHT-Key > Selection of menu items within a level Selection of a new oil viscosity LEFT-Key 0 RIGHT-Key 1 Changing condition of outputs Key Switch Access locking 138