Can someone break down and simplify the requirements needed for the ECU to go from open loop to close loop with the Jaguar Document 801s below : I personally haven't looked into it

This is for ensuring closed loop operation in fuel economy concerns for many

http://www.jagrepair.com/images/Trai...20-%202000.pdf

A quick PDF Doc search function shows the the word " closed loop " appears on page :

15

26

28

36

37

38 x 2

39

43

47 x 2

49

66 x 2

69

72 in pic

73 x 2

81

89

98 x 2

112

 

Hi Parker,

This is a valid but potentially huge endeavor!

Here are a few initial thoughts that may help in your sojourn toward a comprehensive report:

First, if your primary interest is the behavior of the X300 Engine Management System (EMS), you can ignore all the pages in the manual that specifically relate to the AJ6 and V12 engines, and just focus on the behavior of the Lucas/Sagem/GEMS EMS.

Second, it may be just as helpful to search all the instances of "open loop," since these may give details on conditions that cause the ECM to not be in closed loop.

Third, many DTCs can cause the ECM to use default sensor settings or open loop fueling, so it would be worth some research along those lines. The X308 DTC Summaries show these kinds of default actions, but a quick peek at the X300 1996-97 DTC Summaries does not contain this column in the listings, unfortunately.

Fourth, the ECM goes into open loop fueling during some of the Inspection/Maintenance On-Board Monitoring/System Readiness tests, such as the EVAP System Leak Check Monitoring tests, so some research on behavior during the tests will be illuminating.

That's all I can think of with a tired brain. I'll check back to see what others can offer.

Cheers,

Don

 

Thanks Don ,

When I get the time I will rap my head around reading the Doc . and will put it in a simplified table of if you are in the open or closed loop mode and the required perimeters to be in the closed loop mode . In skimming through the pages the ECT perimeter is the one I had known before , but there are others like the EVAP system . Thanks for the X308 information source .

There was a reference to the AJ16 on page 47 using either the upstream sensors or the downstream sensors or other , different then the other engines .

If someone was to break it down in a simplified form , someone ( including me when I read and digest the Doc. ) may put some additional suggestions or understanding to help refine and expand this table in practical on car practice .

Go Team X300