(1) Turn ON ENGINE switch
(2) Drive truck with CTIS in MUD, SAND
AND SNOW and observe steering
(a) If interaxle lockups do not lockup,
fault not corrected. Turn OFF
ENGINE switch and notify DS
(b) If interaxle lockups do lockup,
fault has been corrected.
(3) Turn OFF ENGINE switch.
Steering will become more difficult with
the CTIS in MUD, SAND AND SNOW if the axles
are locking up correctly.