I have code 212 set in my CM and was wondering if this could be caused by setting the timing since the SPOUT needs to be disconnected in order to set it, or if this is an actual fault. I believe this code is a CM only code, and that is why I am asking. Could this be a bad ICM?

 

More than likely the wrong ICM is installed.
This code happens when putting the old type gray ICM for 1993 and older trucks in a 1994 or newer truck that take a black one.

 

Thanks, Subford. That makes sense since I have a 97 f350. So, even though this is CM only code, it's still a constant fault? I get 111 for both KOEO, and KEOR tests.

 

Yes it is and it will not start and run as well with a gray ICM in it.
Note that all auto part stores will try to sell you the wrong gray one but your truck is not wired right for a gray ICM.

 

Note:
To get a right black ICM from an Auto part store just ask of a ICM for a 1995 Ford Mustang with a 5.0L engine to get the right one for your truck.

A Ford dealer may also try to sell you the wrong gray ICM.

 

seems to start and run fine. I do get a surge sometimes while cruising at highway speeds, so that might be related to the wrong ICM. I'll have to check that out. So, since I have a 334 code in CM as well, I am assuming this is also a constant fault?

edit:
I now remembered that 334 would also appear in KOEO and KOER tests, so perhaps this is an old code that didn't get cleared. Or could this also be because there is still something wrong with the EVP?


On a side note, why is it that all the parts places and even most dealers dont know about the grey vs black ICM's?

 

Continuous Memory DTC 334 indicates the EGR valve was open while the engine was stabilized and at idle sometime during vehicle operation.

Possible causes:

-- EGR valve not seating.

-- EVR solenoid allowing excessive vacuum to EGR valve.

-- Damaged EVP sensor.

 

Apparently, the PO had replaced the ICM with the grey one. It's not the only thing I've had to do to this truck that he totally screwed up, and he called himself a mechanic. (Not by any stretch of the word as far as I am concerned). I got a new black one, and 212 went away. I also cleared the CM and I'll see if 334 comes back. Otherwise, I am in good shape at the moment. Just on my drive to work this morning, I noticed a big improvement in gas mileage. I need all I can get with running the 460. Thanks Subford for all your help. I really appreciate it.

 

I think Ford put out the wrong information on the part and all the Auto parts places copied it. And now they will not go back and change it. Some Ford dealers know about it and will sell you the right black ICM part and other will say the gray one is the right one.
I do not think they will ever get this fixed in the computers so we have to live with it.
It is not just the wiring that is wrong after 1994 for the ICM it is also the PCM computer.
The PCM Computer after 1994 is a CCD computer and the one 1993 and older is a push-start Computer. The Computers do the timing a lot differently.

And yes it will make a big difference in MPG.

 

I enlightened my local napa of this discrepancy and hopefully if anyone else comes looking for one, they'll have the right info.

Thanks for the overview of the system. I am new to fords, I've never owned one til now but I am learning. I am an ASE mechanic, so not all of this is new to me. I just need to understand the computer more and I've been reading everything I can on the Ford Fuel Injection site. Again, I really appreciate it.

 

Here are the links to wiring for the two remote mounted TFI-ICM.

The black wiring under the hood 94 & newer CCD remote mounted ICM:


The gray wiring under the hood 93 & older PS remote mounted ICM:


And the four ICM:


/

 

Great info, but the first two images are the same. I can see how the wiring and ECM would be different for the grey ICM though. Thanks for this, filing away in my documentation.

 

Sorry about that, somehow I posted the same link for both.
It is right now as I have corrected that post.

Look at the third pin down on the TFI type ICM.
The Gray diagram pin #4 gets 12V from the starter solenoid while cranking and the black pin #4 sends IDM information to the PCM Computer so it can change the dwell as it needs too. With the gray ICM the PCM computer can not get any IDM information to change the dwell so the computer gives the 212 error for no IDM information received.