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2010 Expedition u210b Fixed

  • bruce.oliver
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8 years 3 months ago - 8 years 3 months ago #10503 by bruce.oliver
2010 Expedition u210b Fixed was created by bruce.oliver
2010 Expedition u210b lost coms between FPCM and restraint control module. Anyone know what the signal is supposed to look like between the 2 modules?
Last edit: 8 years 3 months ago by bruce.oliver.

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  • cheryl hartkorn
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8 years 3 months ago #10519 by cheryl hartkorn
Replied by cheryl hartkorn on topic 2010 Expedition u210b
any symtoms?

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8 years 3 months ago #10520 by cheryl hartkorn
Replied by cheryl hartkorn on topic 2010 Expedition u210b
if your talking about pins 17 and 18 at the restraint control module they are can bus signals. can high you should see 2.5 to 3.5 volts. and can low you should see 2.5 to 1.5 volts. you need a scope to see them. they should mirror each other.

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  • Tyler
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8 years 3 months ago #10523 by Tyler
Replied by Tyler on topic 2010 Expedition u210b
I wonder if that code is referring to this circuit instead:



I'd be interested to know what the voltage levels on this circuit are with everything connected, and the FPDM disconnected.
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8 years 3 months ago #10525 by cheryl hartkorn
Replied by cheryl hartkorn on topic 2010 Expedition u210b
i totally misread the post i thought it said ecm not fpcm!

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8 years 3 months ago #10531 by Ben
Replied by Ben on topic Re:2010 Expedition u210b
Check for corrosion in the fpcm connector and take a look at the back of the fpcm if this is the original aluminum 1 it may have corroded out.... at least that's what happens here in the rust belt.

Sent from my SM-N920P using Tapatalk

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8 years 3 months ago #10548 by Tyler
Replied by Tyler on topic Re:2010 Expedition u210b
Did a bit of research on this one. The FPDM provides at least 10V on this ENS wire to the RCM. If you find at least 10V at the RCM pin, then the flow chart says replace the RCM.

If you do not find voltage, then go the FPDM and recheck. If you still don't have voltage, then check pin fitment and FPDM power/ground before replacing the FPDM. If you Do find voltage, then check the ENS circuit for an open/high resistance.

Condensed the flow chart for ya. :lol:
The following user(s) said Thank You: Al4171990

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8 years 3 months ago #10562 by bruce.oliver
Replied by bruce.oliver on topic Re:2010 Expedition u210b
No symptoms.
Yes it is the ENS circuit. I already went through the testing and we have a RCM on order.

With everything plugged in, RCM and FPDM, the ENS wire is grounded. Still grounded when I unplug the FPDM. With both unplugged the wire has nothing on it. With the FPDM plugged in and the RCM unplugged the wire has 12 volts on it.

I'll report back after the RCM is replaced and programmed

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8 years 3 months ago #10567 by Tyler
Replied by Tyler on topic Re:2010 Expedition u210b
Nice! Let us know how this one ends up?

So, did you happen across anything that explains the exact purpose of this circuit? I'm guessing it has something to do with shutting fuel off in the event of a crash, but I thought that's what the inertia switch was for. :unsure:

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8 years 3 months ago #10591 by bruce.oliver
Replied by bruce.oliver on topic Re:2010 Expedition u210b
It doesn't have an inertia switch. The ENS circuit takes its place

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8 years 3 months ago #10615 by Tyler
Replied by Tyler on topic Re:2010 Expedition u210b

bruce.oliver wrote: It doesn't have an inertia switch. The ENS circuit takes its place


Really? :huh: The diagram I found still has the inertia switch in it.



Not arguing with you at all, just not sure why they're doubling up like this.
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8 years 3 months ago #10619 by bruce.oliver
Replied by bruce.oliver on topic Re:2010 Expedition u210b
The description on prodemand for the ENS circuit said it replaced the inertia switch. I'll go back and reread it and check to see if it has an inertia switch whenever we get it back for the RCM.

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8 years 3 months ago #10634 by Tyler
Replied by Tyler on topic Re:2010 Expedition u210b

bruce.oliver wrote: The description on prodemand for the ENS circuit said it replaced the inertia switch. I'll go back and reread it and check to see if it has an inertia switch whenever we get it back for the RCM.


Sweet! Wouldn't be the first time a diagram was wrong, either. :lol: I'm guessing this Expedition still starts and runs, right? Wondering if this circuit can cause a no start...

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8 years 3 months ago #10678 by bruce.oliver
Replied by bruce.oliver on topic Re:2010 Expedition u210b
It dones have an inertia switch in the left rear corner.

New RCM installed and programmed. KOEO and KOER the ENS circuit has a 0-12v squarewave. With the old RCM it had constant 0v

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8 years 3 months ago #10685 by Tyler
Replied by Tyler on topic Re:2010 Expedition u210b

bruce.oliver wrote: It dones have an inertia switch in the left rear corner.

New RCM installed and programmed. KOEO and KOER the ENS circuit has a 0-12v squarewave. With the old RCM it had constant 0v


Interesting... Just one more thing to go wrong, I guess. :lol:

Thanks for letting us know how it turned out!

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2 years 10 months ago #59251 by Ryansookwah
Replied by Ryansookwah on topic 2010 Expedition u210b Fixed
My 2011 mustang has the same code and I just don’t know what to do. I replaced the rcm and it’s still giving me the code

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