Hello im dealing with a cat gc25k at82d. The forklift is hard starting and when it does it stays in limp mode and the mil light stays on solid. Now its at the point where it doesnt start at all i checked ignition system,fuel system impco- fly by wire throttle.There is spark and the fuel lock- off solenoid opens and theres fuel. It has the computer mounted on the side of the battery (91165-15800)part number its black with a vacumm line (which i suspect is the problem)but i would like to know how to diagnose the system with out a lap top maybe a procedure to make the mil blink the dtc and also a dtc chart. thanks