Unplug ot from your pcm and try to start it

 

Try pulling the chip and see if it will start. Make sure you disconnect both battery negatives before you pull the chip or put it back in.

 

Did everything un plugged it and still no fire. I just left the chip out. I don't know what to do? Take it to a mechanic or what?

 

Hmm. This doesn't seem like it should be this hard. You last post you said the tach doesn't move much. Does it seem to be turning over slow?

 

Well I charge one battery at a time. And it's about all day so I get a couple good try's. I seen it jump once maybe twice. But when cranking It goes up a hair then when I shut key off it goes down. ( maybe a goes up 1/16 to 1/8 on the tape measure )

 

Did you ever start at the top with the flow chart?

 

Just my .02, at this point I would want to KNOW that I had power to my PCM and my IDM.


Looks like pin 71, and maybe?? 55 on PCM




Pin 14 The IDM will not get power without the PCM plugged in and getting power

 

What are trying to tell me to do?

 

Not trying to speak for him, but knowing you have power to PCM and IDM is what I suspect. If you check power at IDM, pin 14 and have battery voltage there with key on, you know the PCM is sending power. Probably not necessary after that, but you can also verify battery voltage is getting to PCM at pin 71 with the key on.

 

Is the new (2nd) CPS you purchased from Ford or International? It should be dark gray with a purple o-ring. Anything else and you are just introducing problems.

 

Yup, that's it. Good point on IDM first. That would indicate PCM is powered and functioning at least to some degree. I'm too new to these trucks to back it up, but my gut tells me the PCM ain't thinking straight. So, if it were me, I'd want to check for power, before swapping PCM's. I know the fuses are good, but there are still at least 2 relays and a diode in play there, as well as a few feet of wire, and some connection points.

 

For example. Notice pin 70 on the PCM is labeled IDM enable output. It's not called power. That makes me think that it is a signal command to relay 2, which is labeled as the IDM relay. This is common nomenclature on our systems at work. I may just be over complicating it, and I don't have the full wiring diagram, but I've seen similar circuits on other systems.

 

The PCM controls the IDM enable line when all factors are met for firing the injectors. Such as RPM, High Pressure Oil and CPS pulses detected. The PCM relay controls the IDM relay so basically they both have power at the same time.

 

OK, so does that IMD enable line fire the relay 2 (IDM), or just send an enable signal to the IDM directly? The PCM labels pin 70 as IDM Enable circuit 814 W/BLK. I don't see that matching color or circuit number or label on the IDM?

 

When the PCM relay engages its contacts the contacts also supplies power to one side of the IDM relay coil. The other side of the coil is pulled to ground via pin 70 (IDM Enable) to energize the IDM relay and supply power to the IDM.