User Guide for ScanXL Pro

[mikesfreetime]

Just purchased the software and currently using it on a Land Rover to diag some emissions issues.  I am having some success logging data to evaluate changes in repairs and component replacement (I am not getting any fault codes and no MIL), but I am unable to register any readings for MAF or comprehensively evaluate O2 readings, they seem to be all over the place.  I saw that back in '08 another newbie asked about a user guide to learn more about the functionality of the software, is anything available to download?  I would really like to educate myself on the use of the tool rather than fumbling around in "whats this button do?" mode.     Any help would be greatly appreciated.

[GaryDoug]

O2 readings are constantly changing when the vehicle is warmed up and operating in closed-loop fuel mode (normal). You should be concerned if the engine is warmed up and the readings are NOT changing. Typical range is from about 0.2Vdc to about 0.8Vdc. Analysis would be limited to seeing if the limits are way off those or the average reading.about 0.4-0.5v, is skewed up or down. Producing a graph of the O2 sensor output can be very helpful.

[mikesfreetime]

Hi Gary,

Thanks for the feedback.  The O2 readings were pretty erratic with the max values on each of the four exceeding 1v.  I must not be setting the parameters for the graph correctly because nothing will display, or the graph is not intended to display while real-time monitor is running?  I ended up pulling all four, two of which have the internal element in pieces.  The response time on each is also inconsistent and excessive so I am replacing all four.  As far as the graphing goes, the pre-formatted graphs also fail to give results with the corresponding PID's selected so I am not sure what I am doing wrong. 

[mikesfreetime]

Reading through other threads I found at least one answer...

You need to be sure you've selected the O2 voltage PIDs in the Settings tab > PID Config. After you've selected the O2 PIDs (something like SAE.O2S11.O2SV) they should start working in the graphs.

Also notice, you need to be RECORDING for graphs to work. If ScanXL isn't keeping a data log, it has no history to graph out. Simply data monitoring will not allow graphs to work.

[GaryDoug]

Correct, you must be Recording. And you may have to adjust the scaling after selecting the PID. Here is a screenshot of mine. I only used the red channels and the first O2 sensor is not installed, so it is flat-lined. By the way, these are signals from a simulator and not real sensors, so they may look strange to you.

[mikesfreetime]

Thanks for your help, I'll give that a try.