Cat 3176 engine codes 72,73,74 wont start ecm? speed sensor?

[rgrimard]

Hello,
I have a MCI 102c3 with a Cat 3176 that all of a sudden won't start (only for a second with either) and flashes 72,73,74. All the injectors are faulty... so it is probably an ECM issue. However, has anyone seen a faulty speed sensor cause this? Just trying to avoid yanking the ECM (not the easiest unit to get to in a bus) if at all possible.
Thank you,
Ray

[chessie4905]

I would inspect all the wiring grounds and connectors for the injectors first.

[luvrbus]

Sounds like the ECM is bad bummer