20.4 Testing the Oxygen Sensor (if equipped)
The PRO-JECTION D system oxygen sensor performance can be evaluated. Probe the gray wire from the oxygen sensor
connector with the positive (+) lead of a digital voltmeter. With the engine running open loop, the meter reading should be near
zero or one volt. During closed-loop operation, the readings should constantly change between zero and one volt. If the reading
is always zero volts, be sure +12V and ground are present on the YELLOW and BLACK wires. If so, the sensor is probably bad.
If you see a changing voltage, but the readings do not vary far from 0.5 volts, the sensor is lazy and should be replaced.
WARNING! Be sure to use a high-impedance digital voltmeter. An older style analog (dial type readout) has an
internal resistance that is too low and will destroy the oxygen sensor if connected to the gray wire.
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