Note On Intermittents

If PCM Code E017 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 ED34 while manipulating wiring on circuits No. 1589 and 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 and tighten star washer). Ground for circuit No. 413 is located at right or rear of cylinder head.

Fig 1: PCM Code E017, Schematic, Left Oxygen (O2) Sensor Not Ready

Courtesy of GENERAL MOTORS CORP.

Fig 2: PCM Code E017, Flow Chart, Left Oxygen (O2) Sensor Not Ready

Courtesy of GENERAL MOTORS CORP.

Fig 3: PCM Code E017