S15/T15 Sonoma P/U 2WD L4-2.2L VIN 5 Flex Fuel (2001)
Oxygen Sensor: Description and Operation
Oxygen Sensor Diagnosis
Diagnose the fuel control Oxygen Sensors (O2S) for the following conditions:
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A slow response
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Response time, time to switch R/L or L/R
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An inactive signal, output steady at bias voltage- approximately 450 mV
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A signal fixed high
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A signal fixed low
Diagnose the catalyst monitor heated oxygen sensors (HO2S) for the following functions:
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Heater performance, time to activity on cold start
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Signal fixed low during steady state conditions or power enrichment-hard acceleration when a rich mixture should be indicated
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Signal fixed high during steady state conditions or decel fuel mode, deceleration when a lean mixture should be indicated
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Inactive sensor, output steady at approximately 438 mV
