Oxygen Sensor

Oxygen sensor(s) is threaded into exhaust manifold(s). Turn ignition off. Connect test harness between ECM and vehicle wire harness. Connect voltmeter between terminals specified in the OXYGEN SENSOR TEST TERMINALS  table. Turn ignition on. If voltmeter does not indicate .4 - .5 volt when ignition is first turned on, and less than .1 volt in less than 2 minutes, check wiring between ECM and oxygen sensor. If wiring is okay, replace oxygen sensor.