Lincoln Aviator 2020-2021 Service Manual / Chassis / Suspension / Vehicle Dynamic Suspension / Description and Operation - Vehicle Dynamic Suspension - System Operation and Component Description

Lincoln Aviator: Vehicle Dynamic Suspension / Description and Operation - Vehicle Dynamic Suspension - System Operation and Component Description

System Operation

System Diagram


Item Description
1 VDM
2 LH front valve solenoid
3 PSCM
4 PCM
5 ABS module
6 LH front height sensor
7 RH front height sensor
8 LH rear height sensor
9 RH rear height sensor
10 BCM
11 RH front valve solenoid
12 LH rear valve solenoid
13 RH rear valve solenoid
14 IPC
15 RCM
16 GWM

Network Message Chart

  Module Network Input Messages - VDM


Broadcast Message Originating Module Message Purpose
ABS active ABS module Indicates the current ABS activity, on or off.
Accelerator pedal position   PCM This message is sent to the GWM and then to the VDM. Indicates the current accelerator pedal position.
Ambient air temperature   PCM This message is sent to the GWM and then to the VDM. Indicates the current ambient air temperature.
Driven wheel torque request   PCM This message is sent to the GWM and then to the VDM. Indicates the current amount of powertrain output requested by the PCM.
Engine RPM   PCM This message is sent to the GWM and then to the VDM. Indicates the current engine speed in revolutions per minute.
Fuel level   IPC This message is sent to the GWM and then to the VDM. Indicates the current vehicle fuel level as a percentage.
Gear lever position   PCM This message is sent to the GWM and then to the VDM. Indicates the current transmission gear status. Used to determine the amount of dampening required during vehicle operation.
Ignition status   BCM This message is sent to the GWM and then to the VDM. Indicates if the current ignition status is off, accessory, run, start, invalid or unknown.
Life cycle mode   BCM This message is sent to the GWM and then to the VDM. Indicates if the current vehicle life cycle is normal, factory, not used or transport.
Message center display   IPC This message is sent to the GWM and then to the VDM. Indicates if the vehicle is equipped with a message center and indicates the current status of the message center.
Message center feature configuration   IPC This message is sent to the GWM and then to the VDM. Indicates if the vehicle is equipped with a message center configuration.
Odometer value   IPC This message is sent to the GWM and then to the VDM. Indicates the current odometer value in kilometers.
Powertrain torque status   PCM This message is sent to the GWM and then to the VDM. Indicates the current status of the powertrain; power pack off torque not available, power pack on torque not available, start in progress torque not available and power pack on torque available.
Stability control brake active ABS module Indicates if the current ESC activity is on or off.
Steering wheel angle sensor   PSCM Indicates the current steering wheel angle relative to the straight ahead position and the number of complete 360 degree revolutions.
Traction control mode ABS module Indicates if the current traction control activity is on or off.
Vehicle configuration data   BCM This message is sent to the GWM and then to the VDM . Indicates the current vehicle configuration and optional equipment.
Vehicle lateral acceleration ABS module Indicates the current lateral acceleration as measured byRCM sensors and relayed by the ABS module.
Vehicle lateral acceleration   RCM Indicates the current lateral acceleration as measured byRCM sensors.
Vehicle longitudinal acceleration ABS module Indicates the current longitudinal acceleration as measured byRCM sensors and relayed by the ABS module.
Vehicle longitudinal acceleration   RCM Indicates the current longitudinal acceleration as measured byRCM sensors.
Vehicle roll rate ABS module Indicates the current roll rate as measured byRCM sensors and relayed by the ABS module.
Vehicle roll rate   RCM Indicates the current roll rate as measured byRCM sensors.
Vehicle speed   PCM This message is sent to the GWM and then to the VDM. Indicates the current vehicle speed in kilometers per hour.
Vehicle yaw rate ABS module Indicates the current yaw rate as measured byRCM sensors and relayed by the ABS module.
Vehicle yaw rate   RCM Indicates the current yaw rate as measured byRCM sensors.

Vehicle Dynamic Suspension

The VDM is connected to the HS-CAN to communicate with the ABS module, the PCM and other modules. With the information received the VDM monitors the heave, roll, pitch, cornering, braking and acceleration of the vehicle. Based on this information the VDM calculates the best action for each valve solenoid.

Once the valve solenoid is energized, the damping increases with the PWM duty cycle. At minimum current the damping is less than when maximum current is applied. The damper and valve solenoid have been designed so failure leads to a firm ride. The fail-safe level of damping is at a level equivalent to what is produced at higher currents, but it is not the same as the maximum current.

When the VDM is initialized (ignition on), it carries out a preliminary electrical check of the height sensors, height sensor circuits, valve solenoids and valve solenoid circuits. Any malfunction detected in the system causes the VDM to set a DTC (diagnostic trouble code) and send a message over the HS-CAN2 to the GWM . The GWM then sends a message to the IPC over the HS-CAN3 and the IPC responds by displaying a message in the message center.

Component Description

Height Sensor

The height sensor uses a potentiometer to send a variable amount of voltage back to the VDM. The sensor has 3 circuits, one circuit is for the 5 volt sensor supply, one circuit is for sensor ground and one circuit is for the sensor output.

Valve Solenoid

The VDM uses a PWM output to control the valve solenoid. The solenoid opens or closes the valve depending on the amount of current supplied by the VDM. The higher the current, the more the valve is opened, resulting in a higher level of damping.

Vehicle Dynamics Control Module (VDM)

The VDM monitors all sensor inputs and all HS-CAN messages that relate to the vehicle dynamic suspension and then directly controls the valve solenoids. The VDM sends an individual electrical current to each valve solenoid to control the amount of damping required.

TheVDM requires calibration when any of the following components is installed new, disassembled, disconnected or removed.

  • VDM
  • Suspension height sensor
  • Front lower control arm
  • Front strut assembly
  • Rear lower control arm
  • Rear shock

The calibration procedure is carried out using the diagnostic scan tool and required for the system to learn the zero-position of the vehicle.

Before performing the calibration procedure:

  • Be sure the vehicle is on a level surface.
  • The vehicle must not be moving.
  • No occupants in the vehicle.
  • Make sure the suspension is in a neutral position if it was recently lowered. To neutralize the suspension, drive the vehicle a short distance, such as around a parking lot.

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