Hi Guys,

I'm experimenting with some Hybrid fuel technologies, and I need to get some info on my 440 GLE 1.8 Oxigen Sensor.

As far as I could check, this car has only 1 sensor carrying 3 wires (2 white - 1 green).
Can someone tell me if the green wire is the signal that the sensor sends to the ECU and the 2 white ones are the heater for the sensor?
Also... do you know the model/brand of the sensor?
I'm asking because my measurements are giving me a steady voltage (around 380 milivolts) where there should be lots of variations between 0 and 1v.....
Could the Sensor be faulty? Or I am faulty? :-)
Thanks in advance for any help/tips you can give me.

Nick

 

Your car does have only one oxygen sensor. It may be a replacement because the original wiring diagram shows 3 terminals, A on its own with a brown wire going to earth (ground); B & C side by side with B having a black wire to terminal 35 of the ECM and C having a grey/red wire to fuse 13.

Testing across terminals A & B with the engine hot and idling and the sensor connected should give a reading of 0.1 - 0.9 volts.
Testing across terminals A & C with the sensor disconnected and engine off should give a reading of 3 ohms at 20C and 13 ohms at 350C.
Testing between C and earth with the sensor connected and engine cranking should give 11 - 14 volts.This checks the supply voltage and the fuel pump relay must be fitted and working correctly to carry out the test.

If you are carrying out the tests as above then the sensor may well be faulty.

I don't know the make or model of the sensor.

 

Thanks a lot Bill,

tomorrow morning I'll carry the tests again and will let you know.
Just to be sure, when you say "testing across terminals A and B or A and C, you mean with one of the tester probe touching A and the other touching B? Please let me know, as I was testing with the RED touching either of them and the black touching earth.... I may well have been wrong there...
Thanks again.

Nick

 

The first two tests are carried out with the probes on the two terminals. The third test is from terminal C to earth.