Self-diagnosis The following measures are implemented automatically depending on the signifi- cance of the fault: D Switching over to suitable replacement function for continued but restricted engine operation, ie engine speed reduced to approx. 1,500 – 1,700 rpm D Reduction of engine speed to idle speed D Immediate shutdown of the engine if required for safety reasons. Depending on the type of fault, engine shutdown takes place by reducing the fuel delivery volume to zero or by way of emergency shutdown with EHAB.
Flash code To read out fault code memory D If engine is stationary or running and ”ignition system” is switched on, press diagnosis request button (Dia button on the EDC operating element) for at least 2 seconds. Diagnosis lamp does not come on D The flash procedure starts after a pause of approx. 3 seconds. The flash code is di- vided into long and short pulses D The diagnostic system always outputs only one fault at a time. In order to check whether several faults are stored, the fault scanning procedure must be repeated until the fault last indicated reappears Example of flash code outputs On Lamp Off 0.5 sec Fault 2x long, 5x short OFF phase before output:
3 seconds ON duration of a long pulse: 2 seconds OFF phase between two long pulses: 1 second OFF phase between long and short pulses: 5 seconds ON duration of a short pulse: 0.5 seconds OFF phase between two short pulses: 0.5 seconds To delete fault code memory 1. Press and keep request button depressed 2. Turn on “ignition” 3. Keep request button depressed for another 3 seconds, but not longer than 10 seconds Now only the fault memory of the flashcode diagnosis is deleted. The second fault memory can be read and deleted only with MAN-Cats. 24