Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2002EXPRESS 1/2 TON VAN V6-4.3L VIN WREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSRELAYS AND MODULES - COMPUTERS AND CONTROL SYSTEMSENGINE CONTROL MODULEDESCRIPTION AND OPERATIONOXYGEN SENSOR DIAGNOSIS
2002 Chevrolet Express 1/2 Ton Van V6-4.3L VIN W
Oxygen Sensor Diagnosis
2002 Chevrolet Express 1/2 Ton Van V6-4.3L VIN WSECTION Oxygen Sensor Diagnosis
Diagnose the fuel control heated oxygen sensors 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 heated oxygen sensors for the following functions:
^ Heater performance, time to activity on cold start
^ Signal fixed low during steady state conditions
^ Inactive sensor
^ 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 heated oxygen sensors 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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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.