Note On Intermittents
If Code EO13 is stored as a history code, start engine and enter diagnostics. Operate engine at fast idle until AUTO closed loop status light is turned on. Observe parameter of ED33 while manipulating wiring on circuits No. 412 and 413. If parameter ED33 changes from a fluctuating voltage to fixed .45 volt, repair intermittent open circuit. Check circuit No. 413 for a good ground to engine (clean, tight star washer installed). Ground for circuit No. 413 is located on the engine, at right or rear cylinder head.