About a month ago my 2005 Ford Excursion 6.0 wouldn't crank. Everything came on fine and there was no sign of a problem. when I tried to crank it nothing happened. I read about the yellow/blue wire on the passenger side and tried that. It cranked right up, and then worked fine with the key. No other problems until today. Same thing happened again. What could this be?

 

When you use the jumper you bypass all ignion switch circuits and everything that would normally be on with key on.

You are applying power directly to the starter bendix solenoid.

 

What I have done is put the key in the on position and then jump the yellow and blue wire to the positive post on the battery. Truck cranks right up and then will crank with the key.

 

Use an OBDII monitor to watch vRef when it's a no-crank. If it drops below 4.5v it could be a bad sensor or connector or harness chaffing. Try wiggling the connector on any/all of the sensors one at a time and see if vRef changes (or it starts) don't forget the connector on the fan shroud for the fan clutch.

There a no start thread in the Tech folder with some more ideas also. The shifter position switch can cause a start inhibit also for example.

 

Try putting it in neutral, and start with key.

 

I tried moving the gearshift around and directly in neutral. No luck. I did do an EGR delete and have stock program minus EGR from SCT. This was done 3 years ago and have never had an issue.

 

Any change in the "theft" light? Also if it has a PATS key, try putting a nickel on each side of the key. I read somewhere that the signal going to the receiving ring (whatever its really called) sometimes doesn't get the signal.

 

Still no luck. If anyone thinks of something let me know.

 

What did you try?

 

The starter relay could be the fault but you need to make sure that the
PCM is seeing the right range indication. It's not like the old days where
it is just a switch. You need to view the indicated gear with a scan tool
because the output in not something you can just read with a meter.

Then if it's reading right at that point you then need to trace the path
to find where it fails to supply power/ground. As I recall there is a relay that
is part of the CJB and you can't replace that. I'll post the circuit for you in a bit.


Well crap. I don't have an 2005 version for you to look at But I can post
the 2006. This won't be totally what you need but will give you some ideas
of what you need to be looking at and how each is related.

Take a look at the relay on page 20-1 just off of F2.113 in the CJB that
is the one that is part of the CJB. Also look at page 20-4 and you can
see how they all tie together,

Sean

 

It happened again. The truck just wouldn't turn over. I tried to jump it and no luck. I towed it to the local FORD dealership and they diagnosed it with a bad FICM. I must say it does run a whole lot better than I ever recall it running.

Does this make sense though? I haven't found anywhere that mentions the FICM being the cause of a no crank.

 

While I could maybe understand the initial no crank being a FICM issue, if it doesn't crank with the jumper wire there is a problem with the batteries, starter, or the connections between them. As mentioned above, you're putting power right to the solenoid that way. It would crank with the FICM removed.

 

Rusty, you are correct. This time I couldn't get it to jump off because the batteries were drained. I asked the ford mechanic and he said that the charging system and batteries were good but that the bad FICM might have drained them. So far it runs great and cranks better than I ever recall.

 

10-4, did you get a FICM assy or just the power board?

 

Rusty,
I had the dealership put a new FICM in. I would have done it myself but no time and it is real cold here in St. Louis right now.
Thank you to everyone on this board.