Test H: Torque on-Demand Functional Test
Pinpoint Test H: Torque On-Demand Functional TestNormal Operation
When operating in 4-wheel drive, the transfer case and both IWE's are locked. When in 4x4 low (4L), the transfer case low range gear set provides an additional 2.64 gear reduction. When operating in 2WD, the transfer case and both IWE's are unlocked.
Possible Causes
^ Transfer case and related components
^ IWE and related components
^ Wheel/tire assemblies
H1-H2:
H3-H11:
H12-H20:
H21-H28:
NOTE: 4x4 high/low (4H/4L) is not intended for driving on hard/dry surfaces.