Ford FCSD TECHNICAL TRAINING FCS-14000-DL Manuel d'utilisateur télécharger pdf (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 Training02-SEP-043-42

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Ford FCSD TECHNICAL TRAINING FCS-14000-DL Manuel d'utilisateur Page 78