Crewmen,
It’s critical that you make sure circuit breaker 1 (CB1) on your M1A2 SEPv3 tank’s power interface box (PIB) is turned on at all times. Why? Because the timer that records how many hours your tank’s engine has run is powered by the engine memory unit (EMU) harness connected to the PIB.
The EMU is a storage drive for data coming from the digital engine control unit (DECU). This data is used to help determine engine health, assist in troubleshooting and pinpoint engine failures that are repaired at depot.
Here’s how you can make sure the engine timer gets the power it needs to do its job:
- Keep an eye on the wiring harness that runs to the DECU from the PIB. In order to operate the EMU and timer, the wiring harness must be connected. Don’t disconnect it for any reason.
Make sure wiring harness is connected
- Be aware that PIB CB1 provides power for the engine timer and can flip off, causing a loss of critical data. This can happen when there’s an overload from the engine not having enough power to start or if the tank is slave started.
- Make checking the circuit breaker a regular part of your BEFORE OPERATIONS PMCS.
Check circuit breaker as part of BEFORE OPERATIONS PMCS