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International Automotive Technicians Network
Ford Readiness Issue
Posted to Emissions Forum on 8/21/2017 33 Replies

Hi all,

I'm having trouble getting CAT, O2 and O2 Heater monitors to run on this 4.0 V-6 Mustang. It is completely stock, not so much as an aftermarket air filter. 2 years ago it passed IEPA emissions testing with all monitors ready. Now it is a chronic reject.

I have tried the TechHelp route, and although I got 7 replies, it has fizzled. TechHelp seems to work well for a day or two and is revived by an update and then that's all you get. So here I am hoping for some advice.

Here's the link to the TechHelp:

http://members.iatn.net/techmail/view/index.aspx?origin=14&d=1&de=1&k=&m=22813&t=ford_drive#reply_anchor

So, here is what I know so far.

1) Fuel trims are optimal at all RPM ranges ( STFT & LTFT -or+3% rarely getting much higher, sometimes a total of 7% usually during RPM transitions . 2) Graphing O2S data I found an issue with the B1S1 O2S:

[2005 Ford Mustang, Emissions Scan Data] I replaced both B1S1 & B2S1 with new Motorcraft O2 sensors, did not help!

3) Mode$06 has zero values for all Cat and O2 tests, meaning the PCM isn't testing after all this time:

[2005 Ford Mustang, Emissions Scan Data]

4) No misfire found in scan data or Mode$06:

[2005 Ford Mustang, Emissions Scan Data]

[2005 Ford Mustang, Emissions Scan Data]

5) No codes found, ever. Even so, have cleared codes a few times hoping to kick start the readiness monitors. 6) Found that the PCM has updated software available, re-flashed it, no help:

[2005 Ford Mustang, Emissions Scan Data];detailed=1&t=visible&i=1&sr=12&sb=%5 Btimestamp%5D%20DESC&s=1&rb=

[2005 Ford Mustang, Emissions Scan Data];detailed=1&t=visible&i=1&sr=12&sb=%5 Btimestamp%5D%20DESC&s=1&rb=

7) Followed these instructions on IDS to set readiness, several times:

http://members.iatn.net/file/viewfile.cgi? id=94738&detailed=1&t=visible&i=1&sr=12& sb=%5Btimestamp%5D%20DESC&s=1&rb=

9) In OBD Mode$01 data, the enable PIDs for CAT, O2, O2 Heater are always a "NO" value. One exception. KOEO, the CAT will read "YES" until the engine starts and quickly reverts to "NO":

[2005 Ford Mustang, Emissions Scan Data];detailed=1&t=visible&i=1&sr=12&sb=%5 Btimestamp%5D%20DESC&s=1&rb=

10) Cat temp seems to rise as high as 1400 F and usually hangs around 1200 F:

[2005 Ford Mustang, Emissions Scan Data];detailed=1&t=visible&i=1&sr=12&sb=%5 Btimestamp%5D%20DESC&s=1&rb=

11) The one problem that may have some weight is the FLI. The Fuel Level Indicator will read a maximum of 53% even with a full tank. This vehicle has a dual pump system with two fuel senders. There is a TSB from Ford on this.

I would gladly sell the repairs to the customer, if I knew that was the issue. I think FLI is not the issue because EVAP runs consistently. Also, regardless of what's actually in the tank the FLI should be enough to set readiness.

I will sell it to the customer as soon as I can prove FLI is the issue. It is a somewhat expensive repair.

I will add more as I go, I hope to hear from my friends out there and start to fix this problem.

Thanks,

Bob Haines
Owner/Technician
Bob's Garage
Waukegan, Illinois, USA

Files Referenced:

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33 Replies Received (View Replies)

 

car Vehicle Data

2005 Ford Mustang 4.0L

Engine4.0 L
Trans5-speed Automatic (Electronic)

car Vehicle Data

2005 Ford Mustang 4.0L

Engine4.0 L
Trans5-speed Automatic (Electronic)