Scan Tool Stopped reading Mode 6 misfire data

Hello all,

I have a 2006 Ford 5.4L Triton and have been dealing with the misfire issues that are pretty common to this engine. 

I bought an Autophix Bluetooth scanner a few years back that has worked great. It would tell me which cylinder was acting up under the mode 6 misfire data before a code was thrown so I could address it with a new coil.  

I recently did a tune up where I disconnected the battery and removed the ECM for access.  Now, the scan tool no longer reads misfire data and says "not supported" when I run the diagnostic. 

I thought maybe my cheap scanner was to blame so I bought a BlueDRIVER but same thing.  It's like the computer stopped reporting this data or something. 

Any ideas why that might happen?  

This thing misfires so often that i cant imagine having to guess which cylinder it is when it starts acting up. 

Any help is appreciated. 

If you disconnected the wiring harness from the ECM, make sure that no pins got bent when reconnecting.

I will check tonight. Thank you.

Checked the ECM and all pins look good.

Is it possible the vehicle needs to be driven a certain amount of miles before the computer starts to read that data? Doesn't make any sense to me.

Is it possible the vehicle needs to be driven a certain amount of miles before the computer starts to read that data? Doesn't make any sense to me.

It's possible that the misfire profile got reset when you disconnected the battery. If that's the case, you may not see the misfire counts populating in Mode $06. From Ford theory and operation:

"In the event of battery disconnection or loss of Keep Alive Memory the correction factors are lost and must be relearned."

"The correction factors are learned during closed-throttle, non-braking, de-fueled decelerations in the 60 to 40 mph range after exceeding 60 mph (likely to correspond to a freeway exit condition)."

However, I don't think that should stop the vehicle from reporting back about Mode $06 results if the scanner asks for them. As in, if you ask for Test ID $53 or $0B/0C results, the vehicle should report something back, regardless if there's no misfires or if the profile hasn't learned.

Do any of the other Mode $06 tests report back any results? Do the other OBD functions work correctly (readiness monitors, codes, Mode $09)?