#98 is the K40 relay. The detail incorrectly includes it in the left side fuse box when in reality it is located in the right side apparatus box. Front most relay.
http://www.detali.ru/cat/oem_mb2.asp?TP=1&F=210025&M=606%2E962&GA=722%2E608&CT=F&cat=45P&SID=54&SGR=040&SGN=03
I don't remember hearing of a K40 failing to provide power in a cycling manner before but suppose it is possible. Power is usually interrupted to the SOV causing it to instantly shut, which shuts the engine down "w/o warning, as if key were turned off".
You might check the fuses on top of the K40; pull, examine and clean them.
The K40 relay gets its signals from the ECU/IFI computer.