Prowler V6-3.5L VIN G (1999)
Oxygen Sensor: Testing and Inspection
Sensor Functional Test
NOTE: This test should be performed only after basic inspection, and ignition and fuel systems inspections are passed.
NOTE: Only use a high input impedance Digital Volt Ohm Meter (DVOM) when testing components on computerized vehicles.
CAUTION: Verify DVOM is set to read VOLTS only (not ohms). Verify 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 engine OFF, connect the negative lead of the DVOM to engine ground. Set the DVOM to read DC VOLTS. Disconnect the oxygen sensor
connector. Connect the positive lead of the DVOM to the oxygen sensor.
3. Create a full lean condition, by removing a large vacuum hose, for 10 seconds. Voltage should decrease to 0.2 volt or less and remain there.
4. Create a full rich condition, by introducing propane into intake manifold, for 10 seconds. Voltage should increase to 0.8 volt or less and remain
there.
5. Verify that engine is at operating temperature and O2 sensor heating element (if equipped) is functioning. See, sensor heating element test.
6. If engine is at operating temperature and heating element passes, but the sensor fails to vary according to the test steps above, the sensor is
defective.
7. Connect the oxygen sensor and clear codes.
