Lincoln Aviator 2020-2022 Service Manual / Chassis / Suspension / Vehicle Dynamic Suspension / Description and Operation - Vehicle Dynamic Suspension - Vehicles With: Air Suspension - System Operation and Component Description

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

System Operation

System Diagram

Item	Description
1	HS-CAN2
2	HS-CAN1
3	HS-CAN3
4	SUMA and Air Compressor Assembly
5	LHF Air Spring Solenoid
6	PSCM
7	PCM
8	ABS
9	LHF Height Sensor
10	RHF Height Sensor
11	LHR Height Sensor
12	RHR Height Sensor
13	BCM
14	RHF Air Spring Solenoid
15	LHR Air Spring Solenoid
16	RHR Air Spring Solenoid
17	IPC
18	RCM
19	GWM

Network Message Chart

Module Network Input Messages - SUMA

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 SUMA. Indicates the current accelerator pedal position.
Ambient air temperature	PCM	This message is sent to the GWM and then to the SUMA. Indicates the current ambient air temperature.
Driven wheel torque request	PCM	This message is sent to the GWM and then to the SUMA. 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 SUMA. Indicates the current engine speed in revolutions per minute.
Fuel level	IPC	This message is sent to the GWM and then to the SUMA. Indicates the current vehicle fuel level as a percentage.
Gear lever position	PCM	This message is sent to the GWM and then to the SUMA. 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 SUMA. 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 SUMA. 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 SUMA. 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 SUMA. 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 SUMA. Indicates the current odometer value in kilometers.
Powertrain torque status	PCM	This message is sent to the GWM and then to the SUMA. 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 SUMA . Indicates the current vehicle configuration and optional equipment.
Vehicle lateral acceleration	ABS module	Indicates the current lateral acceleration as measured by the RCM sensors and relayed by the ABS module.
Vehicle lateral acceleration	RCM	Indicates the current lateral acceleration as measured by the RCM sensors.
Vehicle longitudinal acceleration	ABS module	Indicates the current longitudinal acceleration as measured by the RCM sensors and relayed by the ABS module.
Vehicle longitudinal acceleration	RCM	Indicates the current longitudinal acceleration as measured by the RCM sensors.
Vehicle roll rate	ABS module	Indicates the current roll rate as measured by the RCM sensors and relayed by the ABS module.
Vehicle roll rate	RCM	Indicates the current roll rate as measured by the RCM sensors.
Vehicle speed	PCM	This message is sent to the GWM and then to the SUMA. Indicates the current vehicle speed in kilometers per hour.
Vehicle yaw rate	ABS module	Indicates the current yaw rate as measured by the RCM sensors and relayed by the ABS module.
Vehicle yaw rate	RCM	Indicates the current yaw rate as measured by the RCM sensors.

Air Suspension

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

When the SUMA is initialized (ignition on), it carries out a preliminary electrical check of the height sensors, height sensor circuits, solenoids and solenoid circuits. Any malfunction detected in the system causes the Air Suspension Control Module 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

Easy Entry/Exit Feature

When the vehicle is in Standard operating condition (not in the Deep Conditions or Excite selectable drive mode the vehicle will lower (0.6 inches) 15mm upon igition off. This will be interrupted if a door is opened during the leveling process and will resume once the door is closed. The vehicle then will kneel an additional ( 1 inch) 35mm for a total of a ( 2 inch) 50mm drop upon the customers approach. Approach is detected by Key Fob proximity, pressing the unlock button on the Fob, or remote start. Again, this will be interrupted if a door is opened during the leveling process, however it will not resume once the door is closed. The vehicle is intended to only level the front or rear of the vehicle at a time.

Height Sensor

The height sensor sends a PWM signal back to the SUMA. 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.

Air Spring Solenoid

The SUMA uses a PWM output to control the air spring solenoid. The solenoid opens or closes depending on the amount of current supplied by the SUMA.

Air Suspension Compressor Assembly

The Air Suspension Compressor Assembly is a 4 channel system, it supplies and controls air pressure to the the front and rear air springs independently. This is a closed system with an air pressure reservoir.

The compressor only maintains system pressure and can not inflate the entire system if pressure is fully discharged.

SUMA (Suspension Control Module A)

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

The SUMA is integral to the Air Suspension Compressor and not replaceable separately.

The SUMA requires calibration when one of the following components is installed new, disassembled, disconnected or removed.

SUMA
Suspension height sensor
Front air spring
Rear air spring

The calibration procedure is carried out using the diagnostic scan tool and is 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.

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...

Diagnosis and Testing - Vehicle Dynamic Suspension

Diagnostic Trouble Code (DTC) Chart Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices. REFER to: Diagnostic Methods (100-00 General Information, Description and Operation)...

Other information:

Lincoln Aviator 2020-2022 Service Manual: Diagnosis and Testing - Wheels and Tires

Preliminary Inspection Verify the customer concern by carrying out a road test on a smooth road. If any vibrations are apparent, Refer to the Symptom Chart: NVH. To maximize tire performance, inspect for signs of incorrect inflation and uneven wear, which may indicate a need for balancing, rotation or front suspension alignment...

Lincoln Aviator 2020-2022 Owners Manual: Using Summer Tires

Summer tires provide superior performance on wet and dry roads. Summer tires do not have the Mud and Snow (M+S or M/S) tire traction rating on the tire side wall. Since summer tires do not have the same traction performance as All-season or Snow tires, we do not recommend using summer tires when temperatures drop to approximately 45°F (7°C) or below (depending on tire wear and environmental conditions) or in snow and ice conditions...

Locking and Unlocking the Doors from Inside

Lincoln Aviator. Locking and Unlocking the Doors from Inside

Unlock. Lock.

Locking the Doors

Press the lock switch on the door interior trim panel. The doors can no longer be released using the exterior door handle switches and the luggage compartment locks.