Trying to find whats wrong with my old Fem

[Fredrik73]

Now when i have a working FEM in my car i Will post on this thread What im doing with the old FEM
to find whats wrong with it. Maby it wont work But i Will try hard and do need help from all of you.
because i think its a big problem for all of us.
its a expensive part and feels fragile.
/Fredrik

[Fredrik73]

First thing i suspected is the Big relay So i have now removed iT From the card (must find a new )
and reinstall. It was a double with 10 legs 0881D5B0-2AD8-442C-8B99-977997978088.jpeg

[Fredrik73]

I have also cutted all mofets so i can make a clean measurement on them (they are the second components i suspect to fail)
3D817FED-8925-492D-8AF4-6BA9F2D7E1E7.jpeg

[Fredrik73]

If any one knows what relays to use please tell me
i dont find anything by googeling The text on the relay

[BLACK BEAUTY]

way past my pay grade Fredrik

[HKS]

I have also cutted all mofets so i can make a clean measurement on them (they are the second components i suspect to fail)
3D817FED-8925-492D-8AF4-6BA9F2D7E1E7.jpeg

Fredrik,
So far so good. You are doing the repair with minimal damage to the circuit board.
Let me/us know which MOSFETS are P Chanel for sure.

I have been thinking, if I ever replace Q35 (power steering) again, I would cut the pins off Q35 like you did, and mount Q35 on an (low profile) external heat sink.
That would also take some heat load off of the remaining internal switching MOSFETs (and would make future repairs easier).

I might show a picture of what I had in mind. There would be no need to remove the heat sink-clamping-fingers, a most difficult endeavor if you do not have the tools or the grip.

Hermann
P.S. I would mount both the Power steering Q35 and the instrument panel lighting MOSFET on the external low profile heat sink attached to the metal cover of the FEM.
These MOSFETs are low frequency switching devices and should not give off unwanted radiation outside the FEM case and there is a way to shield them.

[URL=filedata/fetch?id=1082801&d=1601493806][URL=filedata/fetch?id=1082801&d=1601493806][
T03-4796678.jpg


/URL]
Haven't decided on this one. Maybe using one for each of the two MOSFETs is better. Problem is, I don't know how much clearance there is between FEM and driver's side kick panel. If here is lots of clearance then I would look for a cast aluminum one to mount both MOSFETs.

[Fredrik73]

Hermann in glad you answered i could not find the thread we started this serch in. That sounds like a good idea with the cooling another thing i have thinked of is a smal cooling fan (but maby then i press or suck in wet air) i Will do the measuring tomorrow at work, and post the results here
/Fredrik

[Fredrik73]

Fredrik,
So far so good. You are doing the repair with minimal damage to the circuit board.
Let me/us know which MOSFETS are P Chanel for sure.

I have been thinking, if I ever replace Q35 (power steering) again, I would cut the pins off Q35 like you did, and mount Q35 on an (low profile) external heat sink.
That would also take some heat load off of the remaining internal switching MOSFETs (and would make future repairs easier).

I might show a picture of what I had in mind. There would be no need to remove the heat sink-clamping-fingers, a most difficult endeavor if you do not have the tools or the grip.

Hermann
P.S. I would mount both the Power steering Q35 and the instrument panel lighting MOSFET on the external low profile heat sink attached to the metal cover of the FEM.
These MOSFETs are low frequency switching devices and should not give off unwanted radiation outside the FEM case and there is a way to shield them.

[URL=filedata/fetch?id=1082801&d=1601493806][URL=filedata/fetch?id=1082801&d=1601493806][
T03-4796678.jpg


/URL]
Haven't decided on this one. Maybe using one for each of the two MOSFETs is better. Problem is, I don't know how much clearance there is between FEM and passenger side kick panel. If here is lots of clearance then I would look for a cast aluminum one to mount both MOSFETs.

Hermann im not sure i understand this, you wrote passenger kickpanel but did you mean driverside kickpanel? There is space over the Fem if you want to put them outside the box Tor easy to enter but there is space
/Fredrik

[HKS]

Hermann im not sure i understand this, you wrote passenger kickpanel but did you mean driverside kickpanel? There is space over the Fem if you want to put them outside the box Tor easy to enter but there is space
/Fredrik

I screwed up. It is drivers Kick panel.

I make mistakes and catch most of them but not all.
I am a very bad typist. The other mistakes must be due to dyslexia.
Hermann

P.S. If there is a TO3 version of a P Channel MOSFET, I would be tempted to use that instead of the TO220 OEM version since we can get an external heat sink made for a TO3 MOSFET.
Wait for the next edit.
Something like this. Still looking.
Will post a picture of a T03 transistor next.

Drilled for TO3 pachage.
https://www.newark.com/abl-heatsinks...rmalManagement

For illustration only. 8 amps not enough.
https://www.toyboxtech.com/nte-elect...ge-200v-8-amp/
Watch for edits.
Still looking for the ideal combo.

Only 1 inch high. This heatsink. Drill your own holes.
https://www.newark.com/wakefield-sol...sink/dp/58F540

[Frank Dreano]

That relay is not on OMRON's running list of discontinued products; prob worth a phone call or email (I realize you are overseas):

https://www.components.omron.com/sal...ice#tabs-relay

There is also a "Tech Support" form on their "Contact Us" web page...to solicit help.

The OMRON numbers on that relay don't match their typical numbering scheme; it may be something done specifically for FORD with a unique designation; so you should be prepared to describe its configuration in any message to tech support so they may provide an alternative.

[Fredrik73]

Did this at work today, And borowed a nice tool that will tell everything about the mofets
thats why all the red cables are There F43F6FFD-CE03-49E2-9E65-8185A63609B9.jpeg

[Fredrik73]

Here is the tool, will test it home tonight and make a youtube video to show F45A2A2A-28B3-4B8E-883D-632C6F9EE777.jpeg

[Fredrik73]

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[Fredrik73]

31F010F2-9A00-46F5-8F4A-DC0A664B749D.jpegE6A56F15-339C-4529-9342-4988DA6AAEDF.jpeg3973A041-FC78-4D25-AAE0-78A8B035F622.jpeg

[Fredrik73]

D28CA484-F03C-4D88-BAF5-677BBB2E8B44.jpegA92D9D80-E451-4470-AF45-3B111879A52C.jpeg006897ED-1C9C-46D1-BCE4-A2D7A386D5E7.jpeg