Note On Intermittents
WARNING: This page is about a different car, the 1990 Cadillac Seville and 1990 Cadillac Eldorado. However, it is still accessible from the selected car via links, so may be relevant.
If Code EO17 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. 912 and No. 413. If parameter ED34 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.