4x4 HI light flashing
#1
4x4 HI light flashing
Hello all;
Searched the forums (and Google) and haven't found a mention of this issue, hoping someone here has.
I have a 2008 F150 Limited (which has AWD like the Harley Davidson). The truck is NOT regular 4WD - the AWD is constantly engaged.
Lately, the 4x4 HI light has been flashing and I have noticed the front wheels are not engaging - now that we've gotten some snow the rear wheels have been spinning up hills. Last winter the truck absolutely hooked up in the snow - now its spinning like a regular rear wheel drive truck.
The ABS light is not coming on - which makes me think it is not the rear wheel sensor. I may change that first, but I don't think the sensor is bad - they are just magnets and don't go bad too often. But its an easy/cheap fix so I may start there.
Any opinions/advice? Anyone see this behaviour before?
Thanks, Steve.
Searched the forums (and Google) and haven't found a mention of this issue, hoping someone here has.
I have a 2008 F150 Limited (which has AWD like the Harley Davidson). The truck is NOT regular 4WD - the AWD is constantly engaged.
Lately, the 4x4 HI light has been flashing and I have noticed the front wheels are not engaging - now that we've gotten some snow the rear wheels have been spinning up hills. Last winter the truck absolutely hooked up in the snow - now its spinning like a regular rear wheel drive truck.
The ABS light is not coming on - which makes me think it is not the rear wheel sensor. I may change that first, but I don't think the sensor is bad - they are just magnets and don't go bad too often. But its an easy/cheap fix so I may start there.
Any opinions/advice? Anyone see this behaviour before?
Thanks, Steve.
#2
Mark
iTrader: (1)
Does it flash 6 times every 2 minutes
#3
Yes it does (was going to post that, but forgot - the indicator light is hidden by the steering wheel). It actually flashes 10 times (definitely not six). I didn't time it but that happens about every two minutes.
#4
Mark
iTrader: (1)
Check the 20A fuse under the hood..there's a small fuse box on the fender well.
#5
Senior Member
Does the AWD system still have IWE's ?
#6
I will check the fuse later today. Fuse 29 and 30 in the passenger compartment were fine - they are related to the AWD system.
No IWE's, so I don't believe its a vacuum problem. From what I can gather, the AWD uses an electrical system to transfer power to the front wheels when it detects slipping in the rear. The truck does have an AWD/4LO selector, but that doesn't seem to do anything now (previously it worked).
No IWE's, so I don't believe its a vacuum problem. From what I can gather, the AWD uses an electrical system to transfer power to the front wheels when it detects slipping in the rear. The truck does have an AWD/4LO selector, but that doesn't seem to do anything now (previously it worked).
#7
Only a 5A fuse under the hood in the small fuse box. A couple of AWD relays in there as well - checking them but I doubt they are the problem.
No resolution yet - truck goes into the transmission shop tonight.
No resolution yet - truck goes into the transmission shop tonight.
Last edited by Steve Forrest; 12-13-2016 at 10:37 AM.
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#8
Transmission shop diagnosed the problem as a transfer case issue - there is a clutch in there that is electronically activated to transfer power to the front. Clutch is done.
This was *likely* caused by different sized tires on the front and back - this is definitely an issue with AWD vehicles. The tires are different brands but within 1/2" of being the same circumference - I though that would be OK (I guess not). Expensive lesson to learn.
This was *likely* caused by different sized tires on the front and back - this is definitely an issue with AWD vehicles. The tires are different brands but within 1/2" of being the same circumference - I though that would be OK (I guess not). Expensive lesson to learn.
#9
Moderator
Ouch Always run the same size tires. According to this about 1/2" in circumference makes a difference of about 16 revolutions per mile! That's going to put a long of stress on it!
https://tiresize.com/comparison/
https://tiresize.com/comparison/