I just repair the AD-6 fault, caused first by loose and dirty fuse, coupled to the material control system, such a fuse because it is dirty and loose caused several faults in the forklift such as AD-5 (After failure AD- 6), the flow diagram to repair the fault says that you must look for false contacts, because the material control system is in trouble, for this you must first check the communication of the CN101 connector cards and CN111 connector