Possible limp mode?

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Aug 25, 2020 | 06:29 AM

#16

Djosbun

Fleet Mechanic

Joined: Oct 2017

Posts: 1,704

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From: Southwest Ohio

Did you check the harness connectors thoroughly, especially where the wires enter?

-- Dave

Aug 25, 2020 | 02:53 PM

#17

gabriell12123

Thread Starter

Mountain Pass

Joined: Sep 2016

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Quote:

Originally Posted by Djosbun

Did you check the harness connectors thoroughly, especially where the wires enter?

-- Dave

yes the harness checks out good

Aug 25, 2020 | 05:14 PM

#18

Mark Kovalsky

Frmr Ford Trans Engr

Joined: Aug 1999

Posts: 24,714

Likes: 2,639

From: SE Florida

Have you checked the harness electrically or visually? If you haven't used a meter to detect opens or shorts you haven't checked the harness. Looking at the harness only will find the most obvious problem.

Did you look inside the insulation where there is soot on the harness? How does the copper look inside the wire? An electrical test could answer this question.

Aug 27, 2020 | 04:50 PM

#19

gabriell12123

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Mountain Pass

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Quote:

Originally Posted by Mark Kovalsky

okay so I just got done going through the harness with a volt meter measuring for resistance and I had a couple wires that measured between .2-.7 ohms is that a bad thing? If not where do I go from here?

Aug 27, 2020 | 05:42 PM

#20

Mark Kovalsky

Frmr Ford Trans Engr

Joined: Aug 1999

Posts: 24,714

Likes: 2,639

From: SE Florida

No, those readings are not bad. How many ohms did you read when you checked each wire to ground and separately to power? Those two should be open circuits, if you get a reading it indicates a short circuit.

Aug 27, 2020 | 06:06 PM

#21

gabriell12123

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Mountain Pass

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Quote:

Originally Posted by Mark Kovalsky

how do I go about doing this? I still have the harness out of the truck right now am I gonna have to reinstall it first? I apologize for the lack of knowledge... maybe there’s a good video that’ll dumb it down for me

Aug 27, 2020 | 08:53 PM

#22

Mark Kovalsky

Frmr Ford Trans Engr

Joined: Aug 1999

Posts: 24,714

Likes: 2,639

From: SE Florida

There probably is a video. I've never looked for one.

Yes, you have to install the harness. Don't plug in the PCM or the transmission. Check the wires for continuity to power and to ground.

Aug 29, 2020 | 03:29 PM

#23

gabriell12123

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Mountain Pass

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Okay I did some more digging today and found a short on circuit 22 (maxi) junction box fuse/relay panel battery feed, so I move to interior fuse box under the dash and I get to fuse 15 (GEM module/BPP switch) and there was a short on that circuit. I spend some time taking out the fuse box to get to the gem module and when I get the connectors off I can tell there where a little dirty and wet I get the gem separated from the fuse box and open it up to a big ol carpenter ant that I’m guessing got fried on the leads I’m hoping this helps I’m sure this was causing a problem somewhere but hopefully it helps the real problem, waiting for it to dry up outside a little so I can seal the module tight to keep water and bugs out