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O2 Sensor (NGC)
The
O2 system will with ignition on and engine off have a normalized O2 voltage of around
5 volts as displayed on the DRBIII or measured with a high impedance voltmeter. As the O2 sensor starts generating a signal the voltage will move towards
2.5 volts. The voltage will typically vary between
2.5 volts and 3.5 volts on a normal running engine. The goal voltage is also typically between
2.5 and 3.5 volts. This implies that the
0-volt through
1-volt range that you are used to is still valid, only it is shifted up by a
2.5 volt offset. This
2.5 volt supply is being delivered through the sensor return line.