Town & Country Van AWD V6-230 3.8L VIN L SMFI (1998)
Oxygen Sensor: Testing and Inspection
Sensor Functional Test
Oxygen Sensor And Connector
CAUTION: Use a high impedance [1] Digital Volt Ohm Meter (DVOM) ONLY, when testing components on computerized vehicles.
1. Make sure the vehicle is at normal operating temperature. Run the engine at 2,500 rpm for 3 minutes with the transmission in PARK (A/T) or
NEUTRAL (M/T).
CAUTION: To avoid damaging sensor, voltmeter must be set in Volts mode only, (not ohms).
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 (
O2S) electrical connector and connect the positive lead of the DVOM to the oxygen sensor signal wire.
3. Start engine. Create a lean condition for 10 seconds. Voltage should decrease to 0.2 volt or less and remain there.
4. Create a rich condition for 10 seconds. Voltage should increase to 0.8 volt or more and remain there.
5. If sensor fails to vary according to the test steps above, the sensor is defective.
6. Connect sensor and clear codes.
Remarks:
[1] Minimum 10 Meg (10,000,000) ohm input impedance.
