Poseidon SE7EN+ User Manual Chapter 4 Page 68
Whenever an oxygen sensor is changed, the serial number of the new sensor, and its position
(Primary or Secondary) should be logged. This should also be done whenever the positions of
the two oxygen sensors are reversed. Doing so allows the history of the sensor to be tracked
over time and correlated with the logged data associated with that sensor. Such information
can be extremely valuable for detecting when a sensor is nearing the end of its life. The serial
number of the sensor is printed on the sensor label, as shown in Figure 4-5.
Once the oxygen sensor base and sensor are removed from the electronics module, the elec-
trical connection can be unplugged from the back of the sensor. Detach the tool from the
sensor base by releasing the plunger button and pulling it off. The oxygen sensor can then be
removed from the sensor base by unscrewing it (Figure 4-5).
Attach the new oxygen sensor to the oxygen sensor base by screwing it into place. Make sure
the o-ring around the base of the threads on the oxygen sensor is clean and free of any
damage, and that it seals properly when the sensor is screwed down snugly.
Once the sensor is properly attached to the sensor base, the electrical connector on the elec-
tronics module should be attached to the sensor. The sensor has three electrical contact pins
in a straight row, parallel to a at plastic guide tab. Hold the connector so that the three
contact holes line up with the three pins on the galvanic sensor, and the two plastic pins on the
connector straddle the at guide tab. For the Solid State sensor it is four holes. Carefully push
the connector without bending any of the pins, until it is completely seated.
Figure 4-5. The oxygen sensor is attached to the
sensor base by threads, sealing by an o-ring.
Oxygen sensor base
Galvanic O2 sensor or
Solid State O2 sensor
Digital sensor connector
Sensor serial number
IMPORTANT:
Make sure that the cables are not creating
a tension pushing the connector out.
Analog O2 sensor connector
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