Ford Fusion: Automatic Transmission External Controls - 6-Speed Automatic Transmission – 6F35 / External Controls - System Operation and Component Description. Description and Operation

System Diagram

System Operation

Component Description

When the driver needs to change gear position the driver selects P R N D or L by rotating a GSM dial. The GSM senses the dial position and sends a request over the High Speed Controller Area Network 2 (HS2-CAN) through the GWM over the High Speed Controller Area Network 1 (HS1-CAN) to the PCM. The PCM receives the input from the GSM, combines in vehicle conditions to determine commanded transmission range then sends a command to the TRCM through a GWM over the High Speed Controller Area Network 2 (HS2-CAN). The TRCM acts on the command from the PCM by moving the transmission to the commanded position via a selector lever shift cable. The PCM reads the transmission range sensor (TRS) and confirms the correct position has been achieved. The PCM then sends a message to the GSM and the IPC to display the current transmission range.

GSM

Each GSM rotary dial has hall effect sensors that are used as inputs that the dial has been rotated. When park is selected above 5 mph neutral is provided along with a message in the IPC. The Brake Transmission Shift Interlock (BTSI) CAN signal is used for normal function to shift from P.

TRCM

The shift by wire system uses the driver’s seatbelt buckle as one of several inputs used to determine driver presence. If the buckle is deemed faulted for any reason the system reads this as “unbuckled” so that any time the door transitions to “open” below a set speed the TRCM is commanded to return to park.

TRCM

The TRCM actuates the shift cable in place of a conventional selector lever. It receives commands from the PCM and GSM via High Speed CAN. The shift cable connects the TRCM to the transmission manual lever.

Selector Lever Cable

The selector lever cable consists of:

• a cable that connect the transmission manual control lever to the TRCM.
• an adjuster locking tab at the transmission manual control lever.

TCS

The TCS:

• is a momentary contact switch located on the floor console.
• engages or disengages the TOW/HAUL feature of the transmission.
• illuminates the TOW/HAUL icon on the IPC.

With the TOW/HAUL feature of the transmission activated, the transmission delays upshifts to reduce the frequency of transmission shifting and provides engine braking to slow the vehicle and assist the driver in controlling the vehicle when descending a hill.

IPC

The IPC receives signals from the PCM and displays the current range of the transmission on the PRNDL. Under some circumstances messages from the shift by wire system are also displayed for the customer on the multifunction display. For example, "Press Brake to shift from Park" is displayed when an attempt to shift to a non-park rotary dial position while the vehicle is in P and the brake is not pressed.

BCM

The BCM provides Brake Transmission Shift Interlock (BTSI) information, GSM LED intensity status, electronic door lock commands, and ignition status to the GSM, TRCM and PCM. The BCM is also responsible for customizing BTSI and other signals based on local regulations and vehicle features.

Rotary Dial Shift Modes

Automatic Return to Park

NOTE: This feature does not operate when your vehicle is in Stay In Neutral Mode or neutral tow.

The vehicle has a safety feature that will automatically shift the transmission into P when one of the following conditions are met at low speed:

• The ignition is turned off and vehicle falls below low speed threshold
• The driver door is opened with the seat belt unlatched
• Unlatching the seatbelt while the driver door is open

Stay in Neutral Mode

If necessary for the vehicle to stay in N without the driver present, such as being pulled through a car wash, this mode disables Return to Park. In Stay in Neutral the system will remain awake draining the battery if the engine is off. When you enter neutral at low speed a message will be displayed stating press the L button to stay in neutral mode. Then, if the driver presses the L button within the time limit, the message Stay in Neutral Mode appears on the multifunction display. During this mode the N position on the GSM flashes continuously and the instrument cluster will display N as the selected gear. To exit the Stay in Neutral Mode, shift out of neutral.

Neutral Tow Mode

This mode is similar to the Stay in Neutral Mode, however it allows the vehicle to power down in N. See owner's manual for instructions on how to enter or exit the Neutral Tow Mode.

Cable Adjustment Mode

The scan tool contains a service mode that allows for the mechanical alignment of the TRCM and the transmissions positions.
Refer to: Selector Lever Cable Adjustment - 1.5L EcoBoost (118kW/160PS) – I4 (307-05A Automatic Transmission External Controls - 6-Speed Automatic Transmission – 6F35, General Procedures).
Refer to: Selector Lever Cable Adjustment - 2.0L EcoBoost (184kW/250PS) – MI4 (307-05A Automatic Transmission External Controls - 6-Speed Automatic Transmission – 6F35, General Procedures).

Default to Park

The TRCM has a spring actuated mechanism that can be tripped to achieve P as a last resort if the rotary dial shift system is unable to secure the vehicle. The TRCM is commanded to relatch the default to park mechanism when power is restored, the override rotary dial is rotated (if equipped) or a key cycle is performed. If the default to park is done with the vehicle running it takes a key cycle to initiate the relatch. Default to park does not initiate if the vehicle is already in P. The mechanism can be tested by requesting a TRCM on-demand self test using a diagnostic service tool.