MoTeC Global Forum

I have a customer that bought a new set of lambda sensors and would like to fit them. To help him set up the LSU4 sensors I asked him to read the calibration number on the connector and measure the calibration resistor. I got back 308 with 130.5 ohms and 807 with 165.7 ohms. These are so far from the 1000 to 1200 range that I typically see that I am questioning the information. Also there appears to be disagreement between the marking and the resistor. What do you guys commonly see on the LSU4's ( i.e. 0 258 006 066 )?

Shouldn't the calibration be engraved on the body instead of the connector of the lambda sensors that are supplied by Motec? I don't think Motec require the resistors to work.
You can do a free air calibration to verify the calibration numbers.

You are correct that the Motec ECUs do not directly read the resistor. That is why we need to enter the correct calibration number.

My understanding (/experience) is that the free air calibration only works well on used sensors.

Thanks,

Eric Schieb

If memory serves there used to be a note on the old motec usa site that said to measure the resistance between pin 1 and 6, multiply by 10 and that is your calibration number. For my sensors the result closely matched the free air calibration I did on my 066 lsu4s.