The M1A2 SEPv2 and SEPv3 tank’s engine memory unit (EMU) needs to work correctly so that critical engine data can be collected and analyzed.
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.
EMU helps maintain engine health
Maintainers, make sure that the EMU system is working like it should by checking the green light located on the reset button on the 2W526-E harness. The 2W526-E harness runs to the DECU from the power interface box (PIB).
Reset button located on 2W526-E harness
The reset button has a black dust cover (or boot) over the end that may need to be pulled back so the green light is visible. If the green light is visible, the EMU system is good to go. If no green light is visible, the maintainer will need to follow the troubleshooting guidelines in any of the following: TM 9-2350-388-10-3 (Jan 18, w/Ch 1, Sep 20), TM 9-2350-264-10-3 (Sep 11, w/Ch 4, Jan 18) and TM 9-2350-412-10-3 (Apr 20) using symptom “ESS-13.”
If light is green, EMU is good
Check out this previous PS Magazine
article for more info about the EMU: