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Home >> Chevrolet >> 2002 >> Express 1/2 Ton Van V8-5.7L VIN R >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Description and Operation >> Powertrain Control Module >> Powertrain Control Module (PCM) Description >> Oxygen Sensor Diagnosis
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Oxygen Sensor Diagnosis

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