AN MD90 RETURNED TO THE GATE DUE TO 'L GENERATOR OFF' AND 'L PWR FAULT' ON ANNUNCIATOR PANEL WHEN AUTOTHROTTLE SWITCH PLACED TO 'ON.'

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ON FEB/TUE/05; ACR X RETURNED TO GATE. CREW DID A WRITE-UP. AT 40 KTS; WHEN AUTOTHROTTLE SWITCH PLACED 'ON;' WE GOT A 'L GENERATOR OFF;' 'L AC POWER FAULT' ON FAULT ANNUNCIATOR PANEL. ON THE STATUS PAGE WE HAVE. 'L ELECTRICAL SYS FAILURE' AND 'L EEC PERFORMANCE PENALTY 2.' RETURNED TO GATE. I MET THE ACFT AT GATE. BOTH ENGS SHUT DOWN. CHKED FAULT ANNUNCIATOR PANEL -- NO INDICATIONS AT THAT TIME OR ANY MESSAGE ON FAULT ANNUNCIATOR PANEL OF 'L EFC PERFORMANCE PENALTY 2.' TALKED TO LEAD MECH ABOUT MESSAGE. CONCLUDED THAT SINCE THERE WAS NO 'L EEC PERFORMANCE PENALTY 2' ON FAULT ANNUNCIATOR PANEL; IT WAS NOT A REAL TIME FAULT. I CHKED THE L VARIABLE SPD CONSTANT FREQ GENERATOR -- OIL LEVEL OK. NO DIFFERENTIAL PRESSURE OR OIL FILTER INDICATORS POPPED. CREW RPTED L ELECTRICAL OK; PICKED UP BY #2. FORWARD TO MAINT CARRYOVER AND PLACARD PER MEL 24-21-01A. #1 ENG GENERATOR INOP. THE FAULT 'L EEC PERFORMANCE PENALTY 2' DID NOT EXIST AT THIS TIME. I SHOULD HAVE MADE IT CLR IN MY SIGNOFF THAT NO MESSAGE EXISTED AT THIS TIME; WHICH I DID NOT.