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Home >> GMC >> 2002 >> S15/T15 Jimmy 4WD V6-4.3L VIN W >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Engine Control Module >> Description and Operation >> Powertrain Control Module (PCM) Description >> Primary System Based Diagnostics >> Oxygen Sensor Diagnosis >> General Information
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General Information

Diagnose the fuel control HO2S for the following conditions:
^ Heater performance, time to activity on cold start
^ Slow response
^ Response time, time to switch R/L or L/R
^ Inactive signal, output steady at bias voltage- Approximately 450 mV
^ Signal fixed high
^ Signal fixed low

Diagnose the catalyst monitor HO2S for the following functions:
^ Heater performance, time to activity on cold start
^ Signal fixed low during steady state conditions
^ Inactive sensor
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