PicoScope 7 Automotive
Available for Windows, Mac, and Linux, the next evolution of our diagnostic scope software is now available.
Steve Smith wrote: ↑Thu May 24, 2018 1:40 pmHello and thank you for the post.
I have completed the LSU 4.9 Guided Tests for "Overview" similar to the LSU 4.2 which can be found here:
https://www.picoauto.com/library/training/testing-the-bosch-lsu-4-2-broadband-oxygen-sensor
I have also completed a LSU 4.9 "Response Test" which is a far more rapid test as per Frank Massey's video here:
https://www.youtube.com/watch?v=UdbZfXMMTQs
The Technical Publication team here at Pico will process these tests ASAP rest assured as soon as they are scheduled
You are correct Victor, the Calibration Resister pin number configuration has changed to pins 1 and 5 with the LSU 4.9
O2 sensor breakout1-Pins1-5.jpg
Assuming the sensor to be functioning correctly:
The Nernst Cell Reference voltage should remain near stable at 450 mV regardless of engine fueling condition
The Pump cell voltage will rise and fall depending upon the level of oxygen content detected in the exhaust system.
You can still use a math channel to convert the pump cell voltage into current (as we know the value of the calibration resister) but a change of voltage relative to fueling condition will confirm the LSU 4.9 opertaion based on response time
Lambda > 1.0 (Lean) decrease in pump cell voltage, increase in current (+)
Lambda < 1.0 (Rich) increase in pump cell voltage, decrease in current (-)
I hope this helps, take care......Steve