A few months ago had a P0457 code. I don't see P0457 as a valid code in the Jag manuals but no matter, it is the code for major evap leak after refueling. Found and fixed the problem. Since then I have driven the car many times on rural roads, stop and go in the city, and a little highway. I put almost 600 miles on it. Pretty sure the evap leak is fixed as before I fixed it I would repeatedly get the CEL about 10 minutes after I would erase the code. Maryland emissions inspection is due so I put the code reader on it to make sure I won't have problems and the OBD is telling me the Evap Drive Cycle is incomplete.

I find a few old threads but the only one with a confirmed solution was getting an exemption from the state of NJ. I'm not moving to NJ to fix this problem. Most of the posts mention the actual drive cycle which I can summarize as
0) fuel tank between 33% and 75% full
1) warm up the engine
2) turn ignition off 30 seconds
3) start the car, accelerate to 50 MPH with engine speed above 3500 RPM for at least 5 seconds
4) maintain 40 to 60 MPH for ____ minutes. One post said 12, one post said 40 minutes
5) coast to a stop
6) let car idle for 2 minutes

There are some WDS things to check but I don't have WDS.

I ran this specific drive cycle on Friday. Evap still incomplete. Did it again 3 times yesterday while putting another 100+ miles on it, still incomplete.

Has anyone found a way to complete the evap drive cycle? Any of you Maryland Jag owners know if it will pass emissions with that cycle incomplete?

 

Maryland allows for one of catalyst or evap readiness to be incomplete, but not both.
I'm pretty sure for the evap readiness drive cycle it starts with a cold start (below temp). and a warm up (above temp) and a drive cycle which allows the evap to pull a vacuum a certain number of times. If you warm up the engine before the drive cycle and then shut it off, the test would most likely never complete at least in most cars, aka two separate drive (engine on) cycles.

 

Thanks! I tried looking for the info about Maryland emissions but failed with my google skills.

I found the Evap readiness drive cycle a few times in this forum but they don't always agree about how much fuel is in the car and how long the car has to be driven so I just went to jagrepair dot com and got the information direct from Jag Tech Bulletin XT303-03, Evaporative Systems Diagnostic Flow Charts, X-Types Model Year 2002 on. It could be my problem is step 5, checking that the purge system is operating. Not sure how to do this without Jag WDS.

 

Funny, that tech bulletin says "If WDS is not available refer to the 'Drive Cycle' section within the 'Powertrain DTC Summary'..."

I just found a document at JagRepair that is called 'DTC Summaries' and under 'Powertrain DTC Summary' it shows the exact same drive cycle instructions, including using WDS.

 

Green ECM drive cycle
1. Idle vehicle until fully warm. Coolant temperature gauge just below mid point (48-
50%).
2. Let engine idle for a further three minutes minimum. (Site 1)
3. Drive the vehicle, with the air conditioning off, on level road using a constant throttle
(use speed control) for at least 60 seconds, in the following gears, at the stated
engine speeds for sites 1,2,3 and 4 in table 1.
4. Return to rest and leave the vehicle idling for 60 seconds.
Table 1
Site Engine Transmission Gear Engine speed (RPM)
1
3.0L Manual N Idle
3.0L Auto P/N Idle
2.5L Manual N Idle
2.5L Auto P/N Idle
2
3.0L Manual 3rd 2000
3.0L Auto 3rd 1750
2.5L Manual 3rd 2000
2.5L Auto 3rd 1750
3
3.0L Manual 4th 2250
3.0L Auto 4th 2000
2.5L Manual 4th 2250
2.5L Auto 4th 2250
4
3.0L Manual 4th 2750
3.0L Auto 4th 2500
2.5L Manual 4th 2750
2.5L Auto 4th 2750

If sufficient adaptive learning has occurred, the evaporative purge valve should now be
operating. This can be verified manually by either touching or listening to the valve. It is
possible to feel the valve switching by touching the evaporative purge valve.
Warning: the Evaporative Purge valve is likely to be HOT.
To listen to the valve, for possible switching, use a stethoscope or other suitable
instrument (switching frequency is 10 Hz).

 

Slight snag: "Green ECM" = brand new.

The issue could be as in this PDF.

 

The 'Green' Drive cycle is for a new ECM, and it is also standard procedure per the Jag Tech Bulletin XT303-03 (posted above), when resetting the EVAP readiness setting.

As noted in the TSB you reference, the readiness will be cleared when "the battery is disconnected or discharged, if the memory is cleared by a scan tool, or when reprogramming OR replacing the engine control module."
Also, if you read that document carefully, you will note that it is referencing the "comprehensive components" readiness test (not the EVAP), and how to complete the .020 inch leak check which is part of that comprehensive readiness test (not the EVAP readiness).

dh53 is having an issue with the EVAP readiness completion, not the comprehensive readiness.