Chrysler Le Baron, Dodge Dynasty, Plymouth Acclaim. Manual — part 95
AIR LINE FITTINGS
To remove an air supply line from an air compres-
sor assembly air line fitting. Push in (toward re-
ceiver dryer) on the plastic ring of the receiver dryer
air supply air line fitting. While holding in the air
line fitting on the receiver dryer pull the air supply
line strait out of the fitting (Fig. 6).
The fitting has a unique push-in feature. A brass
type collet locks the air line in place. One rubber
O-Ring seals the air line to prevent air leakage. To
attach air line, just push into fitting (Fig. 7).
AIR CHECK, RESIDUAL
The air dryer has a valving arrangement that
maintains 172 to 276 kPa (25 to 40 psi).
To test this function, perform the following proce-
dure:
(1) Remove the air line from the dryer and strut or
spring. Attach a piece of bulk nylon tubing to one
side of a Pressure Gauge (0-300 psi), and to the strut/
spring solenoid (Fig. 8).
(2) Attach another piece of nylon tubing from the
dryer (compressor) to other side of the pressure
gauge.
A compression ball sleeve nut and sleeve for 3/16
inch tubing with ball sleeve connector and an inter-
nal pipe T-fitting. Can be used to attach the tubing
to the pressure gauge.
(3) Activate compressor by grounding pin 508 to
pin x 20 (See Control Module Connector), cycle unit
and read actual air pressure. Pressure of 172 to 276
kPa (25 to 40 psi) indicates that the system and com-
pressor is acceptable.
COMPRESSOR PERFORMANCE TEST
This test can be performed on the vehicle to evalu-
ate compressor current draw, pressure output, and
leak down.
(1) Disconnect the compressor motor wiring har-
ness connector.
(2) Disconnect air line between dryer and strut or
spring solenoid.
(3) Connect an air pressure gauge into the system
(Fig. 8).
(4) Connect an ammeter in series between the red
wire terminal on compressor connector and a 12 volt
power source. Also, connect a ground wire from the
black wire terminal on the compressor connector to a
good ground on the frame (Fig. 9)
(5) If the current draw to the compressor motor ex-
ceeds 30 amperes, replace the compressor assembly.
AIR LEAK CHECK
(1) Check all air line to connector joints.
• Air line to compressor connectors.
• Air line to solenoid.
(2) Check the rubber membranes.
• Front struts.
• Rear springs.
Fig. 6 Release Air Line from Fitting
Fig. 7 Push Air Line into Fitting
Fig. 8 Pressure Gauge Installed in System
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(3) Check solenoid to volume canister joint.
• Front strut to solenoid valve connection.
• Rear spring to solenoid valve connection.
(4) Check air line for ruptures, cuts, splits or heat
damage.
Use a soap and water solution or a liquid de-
veloped for leak detection.
SYSTEM OPERATION
ENGINE RUN OPERATION
The
system
will
compensate
for
load
addition/removal when.
• The trunk and all doors are closed.
• The engine speed exceeds 600 R.P.M.
• Throttle angle is less than 65 degrees.
• The brake is not applied.
• You are not cornering above 10 mph.
• There is not a charging system problem with the
vehicle.
ENGINE OFF OPERATION
After passengers/load is removed from the vehicle
the system will correct the vehicle attitude after:
• The trunk and all doors are closed.
• The ignition switch is in the OFF position.
Opening the a door or trunk wakes up the body
computer and the air suspension module. The air
suspension system is now capable of leveling, if
required.
LONG TERM IGNITION OFF OPERATION
The system is capable of one an additional leveling
cycle. After 2 continuous hours of ignition key off and
no door open or trunk open activities. This feature is
implemented to eliminate possible ice freeze-up be-
tween the tire and the inner fender shield.
SYSTEM OPERATION INHIBITORS
The air suspension system is inhibited when:
• The trunk is open.
• A door(s) is/are open.
• The brake pedal is engaged.
• The throttle is at the wide open position.
• The charging system fails.
The maximum compressor pump or exhaust
time is 3 minutes.
SYSTEM FAILURES
Vehicles equipped with air suspension and overhead
console. Will alert the driver of an air suspension
system malfunction. A warning Check Air Suspension
will appear on the overhead console screen.
SAFETY CONCERNS
WARNING: REAR AIR SPRINGS MUST BE DEFLATED
BEFORE BEING REMOVED FROM THE VEHICLE.
WARNING: OPEN TRUNK, OR DOOR(S) OR REMOVE
GROUND STRAP FROM BATTERY BEFORE HOIST-
ING OR JACKING A VEHICLE DURING MECHANICAL
REPAIRS.
WARNING: IF THE VEHICLE NEEDS SERVICE OR
REPAIR OF THE REAR SHOCK ABSORBERS OR
REAR AXLE PIVOT BUSHINGS. THE REAR AIR
SPRINGS MUST HAVE THE AIR PRESSURE RE-
MOVED BEFORE THE VEHICLE CAN BE SERVICED
SAFELY.
SHIPPING MODE
(1) Removing shipping height signal for customer
use.
• Use DRB II tester and 1991 Chassis (Air Suspen-
sion) service cartridge.
• Follow DRB II requirements to cancel shipping
height message in the body computer.
• Connect the Ignition Off Draw (I.O.D.) circuit.
The connection of the IOD circuit will cancel
the Shipping height signal.
(2) Return to shipping height.
• Set shipping command in the body computer using
the DRB II and the 1991 Chassis (Air suspension)
service cartridge.
• Disconnect the I.O.D. connector.
DIAGNOSIS
INITIAL DIAGNOSTIC CHECK
(1) Check for blown or missing fuses.
Fig. 9 Compressor Current Draw Test
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SUSPENSION AND DRIVESHAFTS
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(2) Check all connectors for correct assembly. Check
all connectors for incorrectly installed termi-
nals.
(3) Check pin #21 for minimum of 9.5 volts.
(4) Check pin #20 for minimum of 9.5 volts (with
ignition key on).
(5) Check voltage at pins #5 and #16. The measure-
ment should exceed 0 volts.
(6) Check pin #19 for continuity.
(7) The engine speed should exceed 680 rpm during
idle.
All doors and trunk must be closed for the
system to function.
DIAGNOSTICS PROCEDURES
(1) Use the D.R.B. II tester and the 1991 air suspen-
sion diagnostic service cartridge to begin the trouble-
shooting process.
(2) Use the D.R.B. mating connector under the dash
(drivers side) to plug-in the D.R.B. II test connector
(Fig. 10).
(3) The tester will conduct a complete check of the
suspension system status.
(4) The tester will list the steps to follow to access
and diagnose the failure.
(5) A Volt/Ohm meter can be used for some diagnos-
tic testing.
HEIGHT SENSOR CHECK
If a sensor signal/signals are missing. Follow the
repair procedure listed below.
(1) Check ground circuit continuity. (Remember
front and rear grounds are on different circuits.
(2) For front ground circuit continuity check circuit
S 33.
(3) For rear ground circuit continuity check circuit
X20.
(4) Refer to control module pin out chart and wiring
diagram (see Group 8F in wiring diagram manual) for
individual circuit details.
(5) If open circuits are not found replace the compo-
nent.
Complete circuit testing and connector assem-
blies before replacing a strut or right rear shock.
(6) To measure resistance values, see Height Sensor
Logic Chart and Initial Diagnostic Check in System
Operation.
HEIGHT SENSOR LOGIC CHART
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Fig. 10 Control Module Connector
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SUSPENSION AND DRIVESHAFTS
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