The instuctions with the unit should give you the code, but make sure the run program is in run during a test. If still no joy place the switch in program, power up track:
ENG
#1 (example0
Set
Eng
1
AUX1
(Engine code try 8 for diesel)
Turn power off
wait 10sec and place switch back in run
Start track power and test.
If no joy, trace wiring to motor driver and make sure no broken wires under insulation. G