Pre-Collision Assist Not Available

[Trigganometry]

Umm...42 on each tire is not good.
Check the sticker on the door jamb. Most likely s/b 30. YMMV.

Ya that’s factory TP. Definitely take it down. 32/33 seems to be a nice firm but controlled drive in mine

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[donkeylarry]

Umm...42 on each tire is not good.
Check the sticker on the door jamb. Most likely s/b 30. YMMV.

I have the 17" magnetic aluminum wheel package (Hankook Dynapro a7m 265/65R17 112T tires) and they filled with nitrogen before I took the key and left the dealership after purchase.

 

[Big Blue]

Just can't grasp how this doesn't work properly and that I couldn't even use Cruise Control if I wanted to with less than 200 miles on the truck.

OK, if cruise control not working either it is beginning to sound like a radar issue. Maybe a failed or mis-adjusted sensor. Sounds like a trip to dealer.

 

[donkeylarry]

OK, if cruise control not working either it is beginning to sound like a radar issue. Maybe a failed or mis-adjusted sensor. Sounds like a trip to dealer.

Well the Adaptive Cruise Control option is "unlit" along with the "Pre-Collision Assist" after the message appears at ignition. I haven't tried just normal cruise control on the highway.
Should edit to say that the Adaptive Cruise Control feature is also not available (which makes sense as it surely uses the same sensors).

 

[Trigganometry]

OK, if cruise control not working either it is beginning to sound like a radar issue. Maybe a failed or mis-adjusted sensor. Sounds like a trip to dealer.

This post should be pinned https://www.ranger5g.com/forum/thre...r-after-going-thru-car-wash.11411/post-218082

Then later in thread I think they found a lose connector

 

[Big Blue]

Ya that’s factory TP. Definitely take it down. 32/33 seems to be a nice firm but controlled drive in mine

Yeah, I run mine at 34-35. Doesn't ride like a buck board. Probably some car wash jockey filled the tires.

 

[LoneRNGR]

Tire pressure for the FX4 is 38 psi (its on a label in the door jamb). I have an FX4 and run it with 34 psi cold for comfort and only bump it up to 38 if I have a load. I keep a Dewalt 20V battery operated air compressor in the truck and don't worry about searching for a gas station with a working compressor.

If your TPMS sensors sense an extreme imbalance in the tire pressure it will disable traction control and a large display and alarm will sound alerting you that it is disabled because of the tire pressure. This is basically because traction control will not work properly if each of the tires don't have similar traction and rotational speed. Seems logical that this would affect emergency collision avoidance, but I'm not certain.

 

[NeptuneRanger]

Try this. When facing the blue Ford oval badge on the grill. Measure down 7.5 inches to the gap between the grill and bumper, shine a flashlight in the crack and measure 13 inches to the right. You should see this sensor, is it clean and unobstructed ? You can access it by hand from the opening in the bumper. I am no mechanic but think I cleaned it too when I had my issue.
Also put the tire pressure at 33 to 34 for sure. 42 is ridiculous.

 

[donkeylarry]

Try this. When facing the blue Ford oval badge on the grill. Measure down 7.5 inches to the gap between the grill and bumper, shine a flashlight in the crack and measure 13 inches to the right. You should see this sensor, is it clean and unobstructed ? You can access it by hand from the opening in the bumper. I am no mechanic but think I cleaned it too when I had my issue.
Also put the tire pressure at 33 to 34 for sure. 42 is ridiculous.

Will try this in the morning and report back! Thanks in advance.
I hear what everyone is saying about the tire pressure.
Like I said, I bought the vehicle a week ago. I think the ride is great, never questioned the pressure until this evening after they did tell me they filled with nitrogen before I left the dealership.

 

[Big Blue]

Try this. When facing the blue Ford oval badge on the grill. Measure down 7.5 inches to the gap between the grill and bumper, shine a flashlight in the crack and measure 13 inches to the right. You should see this sensor, is it clean and unobstructed ? You can access it by hand from the opening in the bumper. I am no mechanic but think I cleaned it too when I had my issue.
Also put the tire pressure at 33 to 34 for sure. 42 is ridiculous.

Not sure what sensor that is, but if I had to guess, I would say external air temp. Not sure what it would have to do with the problem. You did say you looked for things that changed when things went wrong.

 

[NeptuneRanger]

Not sure what sensor that is, but if I had to guess, I would say external air temp. Not sure what it would have to do with the problem. You did say you looked for things that changed when things went wrong.

You might be right, I had googled radar sensors and cleaned around the grill area, looked for loose connections, obstructions and scrubbed my windshield inside and out. The problem went away, but back to my original thought it was strange that both events were right after tire replacement. When my tire went way down to 15 to 20 psi (nails) on my way to the tire store, it might have disabled the system. Took a day or so to right itself. The second time all four tires and sensors came off my old wheels and were put on my new wheels. Same thing, took a day to right itself. The OP like me is just trying everything to fix it. Since OP is at 42 PSI, I am just wondering if one tire is off and triggering a similar event. I am not a mechanic so just guessing.

 

[Big Blue]

You might be right, I had googled radar sensors and cleaned around the grill area, looked for loose connections, obstructions and scrubbed my windshield inside and out. The problem went away, but back to my original thought it was strange that both events were right after tire replacement. When my tire went way down to 15 to 20 psi (nails) on my way to the tire store, it might have disabled the system. Took a day or so to right itself. The second time all four tires and sensors came off my old wheels and were put on my new wheels. Same thing, took a day to right itself. The OP like me is just trying everything to fix it. Since OP is at 42 PSI, I am just wondering if one tire is off and triggering a similar event. I am not a mechanic so just guessing.

Just a point of reference. The radar sensor, if you have one, is a black rectangle in the center of the lower grill opening.

Yes, the TPMS take some time to relearn after a tire change or service.

Still have a problem with it disabling a safety feature without triggering its alarm.

 

[NeptuneRanger]

Just a point of reference. The radar sensor, if you have one, is a black rectangle in the center of the lower grill opening.

Yes, the TPMS take some time to relearn after a tire change or service.

Still have a problem with it disabling a safety feature without triggering its alarm.

If by alarm, you mean a warning flashing on the dash saying it was disabled, as I was driving, that did happen in my case, which initially concerned me enough to bring it to the dealer for a full day of testing. The warning came at dusk after driving a mile or two after starting the truck. So it did notify me, but not when starting the truck a bit after that.

 

[Big Blue]

You might be right, I had googled radar sensors and cleaned around the grill area, looked for loose connections, obstructions and scrubbed my windshield inside and out. The problem went away, but back to my original thought it was strange that both events were right after tire replacement. When my tire went way down to 15 to 20 psi (nails) on my way to the tire store, it might have disabled the system. Took a day or so to right itself. The second time all four tires and sensors came off my old wheels and were put on my new wheels. Same thing, took a day to right itself. The OP like me is just trying everything to fix it. Since OP is at 42 PSI, I am just wondering if one tire is off and triggering a similar event. I am not a mechanic so just guessing.

If by alarm, you mean a warning flashing on the dash saying it was disabled, as I was driving, that did happen in my case, which initially concerned me enough to bring it to the dealer for a full day of testing. The warning came at dusk after driving a mile or two after starting the truck. So it did notify me, but not when starting the truck a bit after that.

Meant tire pressure warning before disabling collision alert.

 

[donkeylarry]

UPDATE: I've looked at all the areas mentioned above, cleaned the sensors about every time I get in and out of truck, went to the car wash and to no avail.
The message (Pre-Collision Assist Not Available) comes on every time I turn the key prior to ignition. Each time it does, I get more frustrated than can be imagined. Only thing left to do is take to the dealership, which is just a pain and something that shouldn't be expected in a brand new vehicle. .

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