NEWS | July 1, 2021

M1A2 SEPv2/v3 Tank: EMU Key to Keeping Engine Running

Soldiers assigned to Company D, 1st Squadron, 1st Cavalry Regiment, 2nd Armored Brigade Combat Team, 1st Armored Division, participate in a gunnery at Fort Bliss Dec. 7, 2018, that helped evaluators test the Trophy Active Protection System for tanks
Photo by Winifred Brown

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      
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
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
If light is green, EMU is good

 Check out this previous PS Magazine article for more info about the EMU: