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Buick
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2002
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Century Custom
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Repair and Diagnosis
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Engine Performance
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System
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Engine Control System Self-Diagnostics - 3.1L Engine
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Inspection/Maintenance Procedures
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Inspection/Maintenance Heated Oxygen Sensor (Ho2S) Heater System Set Procedure
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Conditions For Running Test
Conditions For Running Test
The Engine Coolant Temperature (ECT) is less than 90°F (32°C).
The Intake Air Temperature (IAT) is less than 90°F (32°C).
The difference between IAT and ECT is less than 7°F (5°C).
Battery voltage is 10-18 volts.