Hi all. New to the forum & looking for some answers. Got a customers 1985 911 in my shop. Have a crank no start condition. Vehicle has no pulsing ground @ coil, no injector pulse & the fuel pump doesn't energize. Dme relay has been replaced but pin 86 doesn't energize pump. Manually tested pump, both speed sensors, maf etc & all test within acceptable ranges. Possible dme failure?? Thanks in advance