Model 88 V
Users Manual
46
Measuring Voltages on a Typical Oxygen Sensor
Watch the bar graph sweep as oxygen voltage changes.
Depending on the driving conditions, the oxygen voltage
will rise and fall, but it usually averages around
0.450 V dc.
1.
Shut the engine off and insert test lead in the input
terminals shown in Figure 14.
2.
Set the rotary switch to
L
.
3.
Press
C
three times to select the 6 V range.
4.
Connect the test leads as shown.
5.
Start the engine. If the oxygen sensor is unheated,
fast-idle the car for a few minutes. Then press
B
to select MIN MAX Recording.
6.
Press the
B
button to display maximum (MAX)
oxygen voltage; press again to display minimum
(MIN) voltage; press again to display average (AVG)
voltage; press and hold down MIN MAX for 2 seconds
to exit.
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