VT365 No Start

2003 VT365 Engine cranks but will not start, Injectors are not firing, all power supplies to IDM are good. all wires to all injectors have been checked for shorts and opens. Getting codes 452, 453, 455 and 458. low side return shorted to ground. Injectors cycle properly during startup sequence and shutdown sequence. Any advice?

Thanks

VT365 No Start