SOURCE: 2005 ford f-150...4 wheel drive will not
Operationally vacuum holds the IWE ( Integrated Wheel Ends ) out, and once vac is removed the spring engages the IWE.
Lift and support the front of the truck so the front wheels are off
the ground ( take safety precautions, chock wheels, jack stands, etc )
Key on, engage 4x4 and try to turn the front drive shaft.
If it turns it is a problem with the transfer case.
If it doesn't it is a front axle engagement problem.
- If the front drive shaft does not turn :
Shut
of the truck ( still jacked up, and supported ) remove the vac lines
from the IWE. The spring should push the gears in, without the vac line
on.
Check the vent line ( tube that is routed into the engine compartment with nothing attached to it ), for blockages.
If the vent line is clear, and with the vac lines off the IWE should be engaged ( both front wheels locked ).
If
they lock, the problem is with the IWE solenoid not shutting off vacuum
to the IWEs. There is a TSB on the 2004-2006 IWE solenoids, a newer
revision has been made, and used from 2007 and newer MYs.
Here is a block diagram of the IWE system
SOURCE: ECT snow feature Toyota Highlander 2005
Turn vehicle on, with foot on brake put vehicle in NEUTRAL. Still holding brakes move 4x4 switch to 4 wheel drive, it should engage. The ECT snow is just s feather that make the transmission take off in 2nd gear so its not a fast take off and you wouldn't skid. Good Luck
SOURCE: 2005 F150 5.4 will not engage 4 wheel drive. Just
check to see if you hear any grinding noise in the front wheel, if there is then one of the actuator in the front wheels is bad. the dealer sells for around 120.
SOURCE: How put 4 whels drive
If your Highlander is AWD - that means it automatically detects when you need extra traction - and the other wheels engage automatically. You can't turn it on or off manually. If it's not working, you either have the 2wd model - or there is a problem, and you should take it to your favorite shop. Good luck!
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