Gem and transmission range sensor

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Jun 4, 2015 | 02:29 PM

kb3mtv

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Gem and transmission range sensor

Has anyone ever lost a gem due to a faulty range sensor? Ive narrowed down my repetitive frying of my gem and the range sensor is my only logical conclusion. Before I start tearing into the truck I wanted to see if anyone has had this problem before.

Thanks!
Chris

99 f250SD 5.4l automatic

oh and the gem burns up the ground pin and circuit on the board itself. I have verified the ground multiple times and it is fine.

Jun 4, 2015 | 06:39 PM

Tom

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From: Isanti, MN

Hi Chris,

I've never heard of this before, but frying a GEM isn't a common thing. Have you identified the circuit that is burned as the one for the TRS?

Jun 4, 2015 | 08:03 PM

kb3mtv

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Not exactly. I did some digging through the diagram and found that If i apply a ground through the acc delay ground on the fusebox I can get the fried module to work again temporarily. I used my voltmeter to complete the circuit and measured the draw while using different functions and found the wipers, 4wd, dome light, buzzers, and so on and all seemed well, (.5 amps at max). So I got frustrated and pulled over. Soon as I put it in park, before I could even react. Saw the meter skyrocket and than dead.

According to the diagram the neutral position indication is the only communication between the GEM and range sensor so im assuming thats where its from

I do have a code for the range sensor. P0705.... no communication, but I have no issues starting the truck, reverse lights function, etc...

Thank you!!!

Chris

Jun 4, 2015 | 09:07 PM

projectSHO89

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From: St Louis

What is the connector number and pin#(s) that are being burned?

Jun 5, 2015 | 09:10 AM

kb3mtv

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On the connecter with 26 pins, its #26 and its the ground for the gem itself. Just to clarify, the pin itself isn't burned but the gem circuit board is.

Thank you!
Chris

Jun 9, 2015 | 09:07 AM

kb3mtv

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Bump and does anyone have any ideas?

Thanks,
Chris

Jun 9, 2015 | 09:59 AM

projectSHO89

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From: St Louis

I'd be inclined to install a fuse across the circuit trace that is getting burned, then check to see if it's getting fried when the gear selector hits neutral. If so, I'd likely conclude that there's an internal short in the DTR switch that's inadvertently applying battery power to the neutral sense circuit. ... or just replace the DTR switch and see if that fixes the problem. I'd still install the fuse since that's cheaper than replacing GEM modules for testing.