As I interpret it, this means that the engine has been stopped because of a self-diagnosed problem, either one detected by the electronic engine management system, or one actually IN the EMS.

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Note added at 1 hr (2006-04-04 22:38:15 GMT)
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Electronic engine shutdown devices are software based idle limit controls and are. standard features in most commercially available on-road heavy-duty ...
www.arb.ca.gov/regact/hdvidle/isor.pdf

if a engine goes "wild", check mo ang mechanical & electrical tripping devices, such as overspeed trip, electronic engine shutdown and other tripping device! ...
www.kotse.com/topics.php?action=view& topicid=8402&forumid=4

Transmission and Engine shutdown system: an electronic Engine shutdown device and alarm WITH Automatic. override shall monitor Engine oil pressure, ...
www.faspd.ci.houston.tx.us/bids/N12574/n12574.pdf


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Note added at 2 hrs (2006-04-04 22:40:26 GMT)
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I can imagine such devices would be used to prevent catastrophic damage by running with faulty components. In a combat situation, I certainly hope the tankies know how to override them and get their skins out in one piece, regardless of any potential engine damage.