Checking For Oxygen Sensor Switching

Tests 617 - 622:

Tests 623 - 626:

SYMPTOM
* CHECKING FOR OXYGEN SENSOR SWITCHING

POSSIBLE CAUSES
- Oxygen sensor < 0.10 volt defective
- Oxygen sensor signal circuit short to ground
- Air filter or inlet ducts restrictions
- Fuel pump, lines, or injectors defective
- Engine vacuum abnormal