Lincoln 1998 Town Car User Manual

Vehicle Dynamic Suspension
The air suspension system is designed to improve ride, handling and general vehicle driving performance.
 Ride is improved by using an air-type spring.
 Handling is improved by maintaining constant vehicle trim.
Door Ajar Input
The rear air suspension control module also uses DOOR AJAR input from the driver door module to perform two different functions:
 Preventing vents when a door is open to avoid the possibility of the vehicle lowering and the door catching on an obstruction.
 Making a correction in height immediately after the doors are closed, if needed.
Air Suspension Switch
The air suspension switch cuts power to the rear air suspension control module and is located on the LH side of the luggage compartment.
The air suspension switch supplies a signal to the rear air suspension control module and must always be turned off before working on any air suspension component or whenever the
vehicle is being towed, raised or lowered. If the air suspension switch is turned off, the "AIR SUSPENSION" prompt will appear in the LH corner of the cluster when the ignition switch is in
the RUN position.
Air Compressor Assembly
The air compressor assembly:
 Consists of the compressor and vent solenoid.
 Is mounted on the LH side of the engine compartment.
 Is a single cylinder electric motor unit that provides pressurized air as commanded by the rear air suspension control module.
 Is powered by a solid state relay, and controlled by the rear air suspension control module.
 Passes pressurized air through the air compressor drier.
 Uses a snorkel to channel away water before it enters the drier.
SECTION 204-05: Suspension Load Leveling Control 1998 Town Car Workshop Manual
DESCRIPTION AND OPERATION
Procedure revision date: 01/07/1998
Item Part Number Description
1 5A919 Rear Air Suspension Control Module
2 — Snorkel
3 5319 Air Compressor
4 5K761 Air Suspension Switch
5 5311 Solenoid Valve
6 5560 Air Spring
7 5359 Air Suspension Height Sensor
8 — Air Line
2
1998 Town Car Workshop Manual
9/29/2010
http://www.fordtechservice.dealerconnection.com/pubs/content/~WSWG/~MUS~LEN/19/
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Lincoln 1998 Town Car Specifications

General

Brand	Lincoln
Model	1998 Town Car
Category	Automobile
Language	English

Summary

Vehicle Dynamic Suspension System

System Overview and Benefits

Explains how the air suspension system improves ride and handling by using air springs and maintaining vehicle trim.

Door Ajar Input Functionality

Details how the rear air suspension control module uses driver door input to prevent venting when a door is open or correct height after doors close.

Air Suspension Switch Operation

Describes the air suspension switch's role in cutting power to the control module and its location for safe component work.

Air Compressor Assembly Description

Details the air compressor assembly, its components (compressor, vent solenoid), mounting, and power source for providing pressurized air.

Vent Solenoid Function

Describes the vent solenoid's function in allowing air escape during venting and its integrated housing design.

Air Springs Functionality

Explains air springs as pneumatic springs on the rear axle, using compressed air to raise or lower the vehicle.

Air Suspension Height Sensor

Details the height sensor's connection and how its length changes affect vehicle height control strategy.

Air Compressor Relay

Describes the air compressor relay as a solid state relay energized by the control module for compressor operation.

Air Line Routing

Explains that the air line is routed through the chassis from the compressor to each solenoid valve at the rear air springs.