Taurus V6-182 3.0L DOHC SHO (1992)
Oxygen Sensor: Testing and Inspection
Component Tests
CAUTION: Use ONLY a high impedance Digital Volt Ohm Meter (DVOM) when testing components on computerized vehicles.
Be sure the voltmeter is set to read VOLTS only (not ohms). Be sure external voltage is not applied to the sensor lead, as damage to the sensor may
occur.
1.
Make sure the vehicle is at normal operating temperature. Run the engine at 2500 RPM for 3 minutes with the transmission in "PARK" (A/T) or
"NEUTRAL" (M/T).
2.
With the engine "OFF," connect the negative terminal of the voltmeter to engine ground. Set the meter to 2 volts DC. Disconnect the oxygen
sensor lead. Connect the positive lead of the voltmeter to the oxygen sensor.
3.
Create full lean condition for 10 seconds, voltage should decrease to 0.2 volts or less and remain there.
4.
Create full rich condition for 10 seconds, voltage should increase to 0.8 volts or more and remain there.
5.
If sensor voltage fails to vary according to the test steps above, the sensor is defective.
6.
Reconnect oxygen sensor and clear codes.
