I have a D110S-5 doosan forklift which was showing "D4 "Faulty code then disengages from the selected gear each time when it pops out that faulty code, then i searched on Google and the code was for the Overcharging Alternator which was then causing the transmission Ecm to shut down(safe mode i guess) and put the transmission in neutral position then i fixed the alternator and the problem was solved but now i need some schooling on how the alternator and transmission ecm links
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