Ford Fusion: Cruise Control / Cruise Control - System Operation and Component Description. Description and Operation

System Operation

Non-Adaptive Cruise Control

Network Message Chart

  Network Input Messages - Instrument Panel Cluster (IPC)

  Network Input Messages - Powertrain Control Module (PCM)

Cruise Control Operation

The cruise control functions include:

• turning on the cruise control system.
• setting and maintaining the desired vehicle speed.
• accelerating the vehicle speed.
• coasting down to a lower speed.
• resuming the prior vehicle speed.
• turning off the cruise control system.

The cruise control system maintains a selected vehicle speed within a range between 32 km/h (20 mph), or 30 km/h (18 mph) if equipped with a metric cluster, and the maximum limited vehicle speed. When a MyKey® restricted key is in use, the vehicle speed will not exceed the MyKey® maximum limited speed. During normal driving conditions, the vehicle speed can fluctuate slightly from the selected set speed due to road conditions. The vehicle speed can fluctuate more noticably when driving up and down steep hills.

Certain conditions cause the cruise control system to deactivate:

• Application of the parking brake
• Transmission gear selector is placed into a position other than D or OD
• Cruise control set speed is overridden with the accelerator pedal for a period longer than 5 minutes
• Cruise control switch is pressed or stuck longer than 2 minutes
• Vehicle speed decreases more than 16 km/h (10 mph) below the set speed
• ABS fault

The BPP switch assembly (contains the stoplamp switch and cruise control deactivator switch) and APP sensor are hardwired inputs to the PCM.

Electronic Throttle Body (ETB) command is a hardwired output of the PCM.

The vehicle speed is controlled by the PCM through the Electronic Throttle Control (ETC) subsystem.

The cruise control system provides self-diagnostics. Cruise control is disabled anytime an error is detected in the system. No IPC indicator or message center messages are displayed when faults occur.

An Electronic Throttle Control (ETC) system fault also causes the cruise control system to be disabled. In this case, an Electronic Throttle Control (ETC) system powertrain malfunction (wrench) warning indicator is displayed.

Cruise Control Indicator

The cruise control indicator in the IPC illuminates, indicating the cruise control system is active.

Steering Wheel Switch Function

Cruise control switch inputs are received by the SCCM and sent to the GWM on the HS-CAN2 and then to the PCM on the HS-CAN1.

Pressing and releasing the ON/OFF switch turns the cruise control system on. Pressing (SET+) or (SET-) on the SET switch while the vehicle is traveling at the desired speed activates the cruise control system.

Pressing up or down on the SET switch while in the active mode increases or decreases the maintained vehicle speed by 2 km/h per press when displayed units are "km/h" and 1 mph per press when displayed units are "mph". If the respective switch is pressed and held, the vehicle speed continues to accelerate or decelerate until the switch is released.

Pressing and releasing the ON/OFF switch, or turning the ignition switch to the OFF position, turns the cruise control system off. While the cruise control system is active, applying the brake pedal or pressing the CAN (CANCEL) switch puts the cruise control system into standby mode. Pressing the RES (RESUME) switch when the cruise control system is in standby mode causes the vehicle to accelerate to the last speed. Resume does not function if the OFF switch is pressed, the ignition switch is cycled OFF, or if the current vehicle speed is below the minimum operational speed.

Steering Wheel Switches

The cruise control steering wheel mounted switches are momentary contact switches that toggle up and down for the switch state. The switches are an input to the SCCM.

Brake Switch

When the brake pedal is applied, the cruise control deactivator switch, integrated in the BPP switch, opens and removes the ground signal from the PCM input circuit releasing the throttle, immediately deactivating the cruise control system.

Adaptive Cruise Control

Network Message Chart

  Network Input Messages - Anti-Lock Brake System (ABS) Module

  Network Input Messages - Cruise Control Module (C-CM)

  Network Input Messages - Instrument Panel Cluster (IPC)

  Network Input Messages - Powertrain Control Module (PCM)

Cruise Control Operation

NOTE: For a complete illustration of the adaptive cruise control indicators and graphic displays, refer to the Owner's Literature.

The adaptive cruise control system functions much like a standard cruise control system. The adaptive cruise control system automatically adjusts the vehicle speed to maintain a set gap distance from the front of the vehicle and the vehicle in the same path of travel. When the adaptive cruise control system is on and is following a vehicle ahead or a vehicle enters the same driving lane, a follow vehicle graphic is displayed in the message center.

The adaptive cruise control system allows the vehicle to follow a lead vehicle to a stop. An indicator in the message center will indicate the vehicle is in the stopped mode. If the lead vehicle moves from a stop within 3 seconds, the vehicle will automatically resume. If the lead vehicle remains stopped for more than 3 seconds, the system will resume when the driver presses the RES switch on the steering wheel, or taps the accelerator pedal. An indicator in the message center will indicate the vehicle is in RES (resume) mode. The vehicle will automatically accelerate to the set speed.

When active, the adaptive cruise control system relies on the EPB (electronic parking brake) to apply if the driver opens the door or if the system has been stopped for more that 2 minutes. An EPB (electronic parking brake) fault or a door switch fault can prevent the system from holding the vehicle stationary.

The adaptive cruise control system will not activate if the vehicle speed is below 20 km/h (12 mph) or if a lead vehicle is not detected. The driver will see the ADAPTIVE CRUISE - SPEED TOO LOW TO ACTIVATE warning message in the message center.

The cruise control deactivator switch (which is integral to the BPP) is an additional safety feature. When the brake pedal is pressed, the cruise control system deactivator switch opens and removes the ground signal from the PCM input circuit, releasing the throttle and immediately deactivating the system.

The ABS monitors the yaw rate signal and compares it to the wheel speed and steering wheel angle signals. If the ABS module determines the yaw rate is invalid, the CCM disables the adaptive cruise control. The message center displays the message ADAPTIVE CRUISE NOT AVAILABLE and/or ADAPTIVE CRUISE MALFUNCTION.

The CCM monitors the environment in front of the vehicle while active. If the radar beam is obstructed by a buildup of snow, ice, rain or other debris, or the vehicle is driven in a desert environment with no other traffic for extended periods of time, the sensor will trigger a "Radar Blocked" message and will disable the adaptive cruise control. The adaptive cruise control will resume once the obstruction is cleared and the radar is able to detect targets, or upon a key cycle. The message center displays the message ADAPTIVE CRUISE NOT AVAILABLE SENSOR BLOCKED SEE MANUAL.

The ABS module estimates brake temperature by monitoring applied brake pressure over a period of time and sends a message to the CCM when the estimated temperature is above a given threshold. An alarm sounds and the adaptive cruise control system is deactivated until the estimated brake temperature returns to cooler operating conditions. This condition can happen in a hilly or mountainous driving terrain.

Cruise Control Indicator

The adaptive cruise control indicator in the IPC illuminates and the previous gap setting and SET graphic is displayed indicating the system is in standby mode. This notifies the driver the system is ready and the vehicle can be accelerated to the desired speed. Once the desired speed and gap setting is set, the indicator will illuminate in green indicating the system is active.

Steering Wheel Switch Function

The adaptive cruise control steering wheel mounted switches are momentary contact switches that toggle up and down for the cruise control switch state. Pressing and releasing the steering wheel cruise control ON/OFF switch turns the cruise control system on. Pressing and releasing the SET switch sets the vehicle's speed and stores the set speed in memory. The adaptive cruise control indicator illuminates and the message center displays the set speed and gap setting graphic.

There are 2 ways to change the set speed. The first way is to accelerate or brake to the desired speed and press and release the SET cruise control switch until the desired set speed is shown on the message center. The second way is by tapping the RES+ or the SET- switch while in the set mode, increasing or decreasing the displayed set speed by 1.6 km/h (1 mph) per tap. If the respective button is pressed and held, the displayed set speed continues to increase or decrease until the button is released. The adaptive cruise control system may apply the brakes to slow the vehicle down to the new set speed. The set speed displays continuously in the message center while the adaptive cruise control system is active.

Pressing and releasing the OFF switch, or switching the ignition to OFF, turns the adaptive cruise control system off. The adaptive cruise control set speed memory is erased.

Pressing the brake pedal or pressing the CAN switch puts the adaptive cruise control system in standby mode and the last set speed is displayed in the message center with a strike through. Pressing the RES switch when the adaptive cruise control system is in standby mode causes the vehicle to accelerate to the last set speed. The set speed continuously displays in the message center while the adaptive cruise control system is active. The RES button does not function if the ON/OFF button is pressed, the ignition is cycled OFF, or if the current vehicle speed is below the minimum operational speed.

The adaptive cruise control system has the capability for the driver to change from adaptive cruise control to standard cruise control. The LH 5-way steering wheel switch is used to switch from the adaptive cruise control system to standard cruise control system within the message center. For information on selecting the standard cruise control in the message center, refer to Owner's Literature. Once the driver has selected the standard cruise control in the message center, the adaptive cruise control indicator is replaced by the standard cruise control indicator. The vehicle no longer responds to lead vehicles or automatic braking. Upon the next vehicle ignition cycle, the vehicle defaults back to the adaptive cruise control system.

Gap Setting

When a vehicle ahead enters the same lane or a slower vehicle is ahead in the same lane, the vehicle speed adjusts automatically to maintain a preset distance gap. A bar graph in the message center displays the 4 preset distance gap settings. Pressing up (decrease) or down (increase) on the steering wheel cruise control gap switch increases or decreases the distance from the vehicle ahead. If all of the bars are illuminated, this is the longest gap setting. If only one bar is illuminated, this is the shortest gap setting.

The vehicle maintains the distance gap to the vehicle ahead until:

• the vehicle ahead accelerates to a speed above the set speed.
• the vehicle ahead moves out of the lane or out of view.
• the vehicle speed falls below 20 km/h (12 mph).
• a new gap distance is set.

After each ignition cycle, the previous gap setting is remembered and the system is set to that gap setting.

The distance gap can be overridden by pressing the accelerator pedal. The follow vehicle graphic is not displayed in the message center and the green indicator illuminates. When the accelerator pedal is released, the adaptive cruise control system returns to normal operation and the vehicle speed decreases to the set speed or a lower speed if following a vehicle ahead.

Deceleration Control

The CCM commands the ABS module to automatically apply the brakes, slowing the vehicle to maintain a safe distance to the vehicle in front.

Pre-Collision Assist System

The pre-collision assist system is an additional safety feature equipped on vehicles with adaptive cruise control that assists the driver in avoiding a collision. The CCM and the IPMA scan the area in front of the vehicle. If the modules detect that the vehicle is rapidly approaching an object in the vehicle's path of travel, the system will notify the driver with visual and audible alerts. If the driver fails to respond or take action, the vehicle's braking system will apply the brakes to reduce vehicle speed. This helps the driver avoid an imminent collision or helps to reduce damage caused by the impact. The system functions whether the adaptive cruise control system is turned on or off. For additional information,
Refer to: Collision Warning and Collision Avoidance System - System Operation and Component Description (419-03B Collision Warning and Collision Avoidance System, Description and Operation).

Steering Wheel Switches

The cruise control steering wheel mounted switches are momentary contact switches that toggle up and down for the switch state. The switches are an input to the SCCM.

Brake Switch

When the brake pedal is applied, the cruise control deactivator switch, integrated in the BPP switch, opens and removes the ground signal from the PCM input circuit releasing the throttle, immediately deactivating the cruise control system.

CCM

The CCM contains a radar sensing unit which measures the relative speed and the distance between the front of the vehicle and the vehicle being followed. The CCM is responsible for requesting the PCM to increase vehicle speed and the ABS module to brake, when necessary.