Oxygen Sensor: Testing and Inspection

Fig.41 Checking Oxygen Sensor with Voltmeter:

Fig. 69 Oxygen sensor diagnosis chart:

1. Run engine until it reaches normal operating temperature, then connect voltmeter to EFI service connector as shown in Fig 41.
2. Run engine at 2500 RPM for 2 minutes to warm oxygen sensor.
3. Follow diagnostic chart, Fig. 69, and repair system as necessary.