FORD FCSD TECHNICAL TRAINING FCS-14000-DL - Manual (Page 78)

LESSON 3: POWERTRAIN
Operation
6HP26 Cutaway
Engine power reaches the transmission by a torque converter with an integral converter clutch. The six forward
gears and one reverse gear are obtained from both single and double planetary sets.
This automatic transmission is a six-speed electronically controlled transmission comprised of a TCM, main
control valve body unit, torque converter, one solenoid valve and six pressure regulators. Gear selection is
achieved by the control of automatic transmission fluid flow to operate various internal clutches. The TCM
operates the electrical components and provides for the control of gear selection shift pressure which increases
refinement and torque converter slip.
In the event of a system fault, the TCM also provides for Failure Mode Effect Management (FMEM) to maintain
maximum functional operation of the transmission with a minimum reduction in driver, passenger or vehicle
safety. In the event of a total loss of control or electrical power, the basic transmission functions PARK,
REVERSE, NEUTRAL and DRIVE are retained. Also 3rd or 5th gear is retained by the hydraulic system. The
gear retained depends on the gear selected at the time of the failure.
The 2005 Lincoln Navigator is not equipped with a dedicated O/D enable/disable switch. To disable the O/D
function, the operator must move the gear selector from the D6 (sixth gear) to the D4 (fourth gear) position. Since
this transmission uses a two speed O/D (fifth and sixth gears), upshifts are limited to fourth gear. A gear selector
position sensor (located in the gear selector assembly) provides an input to the TCM for control of this function.
2005 Expedition/Navigator New Model Technician Training 02-SEP-04 3-42