4x4 not engaging!!
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More Turbo
Joined: Nov 2012
Posts: 727
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From: Chariton, IA
4x4 not engaging!!
Working on a buddies truck and 4c4 is not engaging. I have swapped out the switch, the servo motor, and relays with ones off another truck, known to work. Also when the old parts were put on the donor truck they worked. I pulled the relays and used jumper wires to engage and disengage 4 high and 4 low. So I think it’s the 4 wheel drive control module but I can’t find it to swap it out.
I have the ford service manual for my 2002. And the control module isn’t in the same place on this 2000. I have a ‘99 I can pull the module out of if I can find it??
any help would be greatly appreciated. TIA
I have the ford service manual for my 2002. And the control module isn’t in the same place on this 2000. I have a ‘99 I can pull the module out of if I can find it??
any help would be greatly appreciated. TIA
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Joined: May 2014
Posts: 27,348
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From: Lake Hartwell, GA
Chris, the 2002 will not be the same as the 2000 since they have different accessory/electronics modules. The 2002 has a VSM and the 2000 has a GEM.
The pinpoint test for the 4x4 ESOF in a 2000 MY is linked below and was taken from the 7.3L PSD Tech Folder.If you would like to jump right to swapping the GEM, it is located behind the fuse box under the dash.
The pinpoint test for the 4x4 ESOF in a 2000 MY is linked below and was taken from the 7.3L PSD Tech Folder.If you would like to jump right to swapping the GEM, it is located behind the fuse box under the dash.
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More Turbo
Joined: Nov 2012
Posts: 727
Likes: 1
From: Chariton, IA
Chris, the 2002 will not be the same as the 2000 since they have different accessory/electronics modules. The 2002 has a VSM and the 2000 has a GEM.
The pinpoint test for the 4x4 ESOF in a 2000 MY is linked below and was taken from the 7.3L PSD Tech Folder.If you would like to jump right to swapping the GEM, it is located behind the fuse box under the dash.
The pinpoint test for the 4x4 ESOF in a 2000 MY is linked below and was taken from the 7.3L PSD Tech Folder.If you would like to jump right to swapping the GEM, it is located behind the fuse box under the dash.
Thanks! So does the 2000 use the GEM to switch the 4x4 instead if the 4 wheel drive control module the 2002 uses? Thanks
FTE Leadership Emeritus
Joined: May 2014
Posts: 27,348
Likes: 5,941
From: Lake Hartwell, GA
The GEM does in fact play a part in the 4x4 ESOF system. I am 90% sure on that and without verifying via the pinpoint test linked above.
Mountain Pass
Joined: Jan 2020
Posts: 121
Likes: 20
Is the 4x4 light on the instrument cluster coming on?
Do you have manual or auto locking hubs? If you have auto locking hubs you can turn them to locked manually to see if it works. If so you are not getting proper vacuum to lock the hubs. You can Jack the front end up, lock the hub and spin the tire to see if the axel is turning to see if the hubs are locking properly.
Additional information on what is going on and testing that has been done can help the people here help narrow down the problem.
Do you have manual or auto locking hubs? If you have auto locking hubs you can turn them to locked manually to see if it works. If so you are not getting proper vacuum to lock the hubs. You can Jack the front end up, lock the hub and spin the tire to see if the axel is turning to see if the hubs are locking properly.
Additional information on what is going on and testing that has been done can help the people here help narrow down the problem.
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More Turbo
Joined: Nov 2012
Posts: 727
Likes: 1
From: Chariton, IA
Is the 4x4 light on the instrument cluster coming on?
Do you have manual or auto locking hubs? If you have auto locking hubs you can turn them to locked manually to see if it works. If so you are not getting proper vacuum to lock the hubs. You can Jack the front end up, lock the hub and spin the tire to see if the axel is turning to see if the hubs are locking properly.
Additional information on what is going on and testing that has been done can help the people here help narrow down the problem.
Do you have manual or auto locking hubs? If you have auto locking hubs you can turn them to locked manually to see if it works. If so you are not getting proper vacuum to lock the hubs. You can Jack the front end up, lock the hub and spin the tire to see if the axel is turning to see if the hubs are locking properly.
Additional information on what is going on and testing that has been done can help the people here help narrow down the problem.
I think we have it narrowed down to the GEM module, I have a donor truck we are going to pull the GEM out of to see if that fixes the problem. its a '99 and this one is a 2000 so hopefully it is interchangeable. we ran out of time today because we were installing a trolley hoist in my buddies shop, so It will have to wait until I get home next weekend to dig deeper.
Does anyone know if there is anywhere to get a new GEM if that ends up being what it is?
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Cargo Master
Joined: Aug 2003
Posts: 2,332
Likes: 442
From: Eastern Washington
I don't think new GEM's are available, but you might be able to find some remanufactured ones. I think there are also some ECU rebuilder companies that specialize in renewing the GEM's.
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More Turbo
Joined: May 2014
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From: Salisbury, MD
Does it have a ZF6 transmission? I have had issues with 4x4 when my clutch switch was not working right (you have to have it pushed in), your brake switch also needs to work right for it to go into 4x4 low I do believe as you need to have the clutch and the brake pushed in and in Neutral.
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Joined: May 2014
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From: Lake Hartwell, GA
Does it have a ZF6 transmission? I have had issues with 4x4 when my clutch switch was not working right (you have to have it pushed in), your brake switch also needs to work right for it to go into 4x4 low I do believe as you need to have the clutch and the brake pushed in and in Neutral.
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Joined: May 2014
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From: Lake Hartwell, GA
As for the GEM, they are no longer available new and some dealers will not reprogram them to the options that were included on the vehicle when it rolled off the factory floor. If you are lucky, you will find a used one that "works" and has the exact same series/part number as the one you are looking to replace. If that is what it comes down to.
Keep us updated!
Keep us updated!
More Turbo
Joined: May 2014
Posts: 578
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From: Salisbury, MD
Might be different, on my 2002 I have to have the clutch pushed in and brake pedal pushed in and in N for it to shift into 4x4 low, same with coming out of 4x4 low. I have always had to have the clutch pushed in for it to activate 4x4 high on mine, it wouldn't do it otherwise.
FTE Leadership Emeritus
Joined: May 2014
Posts: 27,348
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From: Lake Hartwell, GA
Might be different, on my 2002 I have to have the clutch pushed in and brake pedal pushed in and in N for it to shift into 4x4 low, same with coming out of 4x4 low. I have always had to have the clutch pushed in for it to activate 4x4 high on mine, it wouldn't do it otherwise.
Based on my interpretation of the owners manual and how to switch into 4WD high, it is meant to be activated in motion. Hence the portion about being stationary and "start the vehicle moving" if 4WD high does not engage. Again, 4WD low is a different story and I agree with you about how to go into or out of 4WD low.
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Joined: Nov 2012
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From: Chariton, IA
Update. we pinpoint tested and everything points to the GEM. I drive over the road and haven't been home to work on it. Napa shows a body control module for this truck and i think it's the same as the GEM. I have to get the GEM out to check the numbers and order one. Hopefully I can get to it when i get home next week.
Also It's going up for sale as soon as I get it fixed if anyone is interested.
Also It's going up for sale as soon as I get it fixed if anyone is interested.
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