I beleive that the EEC - IV PCM is bad in my 95 F250 with a 460 engine. I have a 92 F250 also with a 460 engine as a parts truck. Can i switch from one truck to the other? Both have the EEC - IV computer. My 95 truck will not start. I have Spark (new plugs, wires and distributer cap), and proper fuel pressure (new fuel filter). Several of the sensors do not have proper voltage going to them from the PCM which is why i think i may have a bad PCM. Any advice would be helpfull. Thanks

 

Gotta give a few ideas quickly..

Be sure that both trucks have the same transmissions...PCM for a AOD won't work for a E4OD trans...Same if one's Standard and the other is auto.

If your voltage for the BAD PCM is not within spec, PULL the PCM. If you have time, take the PCM aprt. Look at the Capacitors. More than likely if a CAP is leaking, crusty, or blown up, that's your voltage problem.

 

I already took apart the pcm from the 95 and I could not see any obviuos problems with the board. Both transmissions are automatics. how do I tell if one is an AOD or E40D?

 

If you do a search for Ford transmission's, you can tell from the transmission pan itself. just do a search with Google. If not, a more experienced member can lead you in the right direction.

 

I just looked at the transmissions and both are identical, so i am assuming that they will be the same. Also took out the PCM from the 92. I will go plug it into the 95 and see what happens.

 

Hi, im looking for a EEC - IV , same engine but it´s from a motorhome, can you tell me the serial numbers, im looking for one on ebay...

 

They are not the same.
The 92 is for a push start Ignition system and the 95 is for a CCD Ignition system.
They require different wiring under the hood and different ICM.

 

What year is the motorhome?
Do you have the calibration number off the door if it is a E250 or E350.
If it is a class "A" what are the three letters at the bottom left on the vacuum diagram sticker on the valve cover on the drivers side.

 

This is interesting to me sorry for the hijack but what is a push start ignition

and on an Automatic equipped truck Not being a Smart Axx I'm curious lol

 

The internal circuitry of the ICM will have one of two possible arrangements, push start or computer controlled dwell (CCD). The push start system allows for increased dwell, or coil ON time, when starting the engine. The ICM on this system determines when to turn the coil ON based upon engine rpm information. The coil is then fired, or turned OFF, whenever a rising edge of a SPOUT signal is encountered. The SPOUT signal, short for SPark OUTput, is a digital signal generated by the PCM providing spark angle information to the ICM. The SPOUT signal on the push start system controls only the firing of the coil. The falling edge of the SPOUT signal is ignored. The CCD system, however, does use both edges of the SPOUT signal. The SPOUT signal for the CCD system is same as in the push start except that the falling edge is now generated to control the time at which the coil is turned ON. The coil ON time, or dwell, for this system is thus entirely controlled by the SPOUT signal. The ICM does not internally determine when to turn the coil ON as it does on the push start system. It responds directly to the SPOUT signal it receives.

In the case that the SPOUT signal line opens from the PCM, the ICM will use the PIP signal to fire the coil. This results in a fixed spark angle and fixed dwell.

Push-Start system:


CCD system:


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