Expo AWD L4-2350cc 2.4L SOHC 16 Valve (1993)
Oxygen Sensor: Testing and Inspection
Federal
Oxygen (O2) Sensor Circuit
To test the Oxygen Sensor, located on the exhaust manifold, proceed as follows.
SENSOR OUTPUT TEST:
1.
Start the engine and allow it to reach operating temperature.
Oxygen Sensor, Test Hook-up
2.
Disconnect the oxygen sensor from the wire harness and connect a digital voltmeter (greater than 1 Meg ohm input impedance) between the
oxygen sensor output connector and ground.
3.
Increase engine rpm to approximately 1,500 rpm.
4.
After approximately 70 seconds of operation at elevated rpm, measure the output voltage of the oxygen sensor while changing engine rpm up and
down slightly.
5.
A properly operating oxygen sensor voltage signal should fluctuate between approximately 0.1 VDC and 0.9 VDC.
6.
If voltage output is "LOW" or non-existent replace the oxygen sensor.
