What do the symbols + and - mean on the CAN bus panel? When the ignition is switched ON a series of + and - will appear on the screen, each representing a node. + Indicates Node has been recognised by the CAN, - Indicates Node has not been recognised by the CAN.
In R750 Euro 5 engines after each oil change the "Oil dilution calculation" function must be reset. The function is reset by the diagnosis tool available from authorised workshops or vehicle dealers. If the diagnosis tool is not available. the function can be reset using the following procedure:
Turn the ignition key to ON with the engine off.
Press the accelerator pedal fully down (0% to 100%).
Wait 3 seconds before releasing the pedal.
Release the pedal, allow it to return to the initial position (0%) and wait a further 3 seconds before pressing it again.
Repeat the procedure in points 2, 3 and 4, five times. In some applications the accelerator pedal is not feasible: proceed using manual accelerator potentiometer.
VERIFICATION: if the procedure has been done correctly, the engine oil low light will flash three times for 1 second each, with a pause of 0.5 seconds. In some applications the verification is not possible.