1993 CHEVROLET PLYMOUTH ACCLAIM Service Manual

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Page 129 of 2438

CHEVROLET PLYMOUTH ACCLAIM 1993 Service Manual AUTOMATIC AIR LOAD LEVELING DIAGNOSTICS
Ä SUSPENSION AND DRIVESHAFTS 2 - 71

Page 130 of 2438

CHEVROLET PLYMOUTH ACCLAIM 1993 Service Manual CONTROL MODULE
REMOVAL
(1) Disconnect negative battery cable.
(2) Remove right side trunk trim panel.
(3) Remove electrical connectors from control mod-
ule and relay (Fig. 9). (4) Remove control mod

Page 131 of 2438

CHEVROLET PLYMOUTH ACCLAIM 1993 Service Manual AUTOMATIC AIR SUSPENSION INDEX
page page
Air Lines ............................... 75
Air Springs Rear ......................... 87
Compressor Performance Test .............. 77
Diagnosis ....

Page 132 of 2438

CHEVROLET PLYMOUTH ACCLAIM 1993 Service Manual FRONT AND REAR AIR SPRINGS
The front and rear air springs are essentially pneu-
matic cylinders that replace the steel coil springs.
The air filled springs allow the vehicle suspension
height to be a

FRONT AND REAR AIR SPRINGS
The front and rear air springs are essentially pneu-
matic cylinders that replace the steel coil springs.
The air filled springs allow the vehicle suspension
height to be adjusted for all weight conditions. The air springs allow for the reduction of spring
rates to improve vehicle ride characteristics.
FRONT/REAR SPRING SOLENOIDS
The front and rear solenoids control air flow in and
out of the front and rear springs. The Air Suspension
Control Module (ASCM) opens the solenoids when
the system requires air to be added to or exhausted
from the air springs. The solenoids operate at a cur-
rent draw range of 0.6 to 1.5 amps.
HEIGHT SENSOR
A magnetic switch type sensor. Located in the
right rear shock absorber and left and right front
struts, (Fig. 2) monitors vehicle height. The sensors
transmit signals to the (ASCM) relating to vehicle
height status (low, trim, medium, high).
CONTROL MODULE
The Air Suspension Control Module (ASCM). Is a
device that controls the ground circuits for the Com-
pressor Relay, Compressor Exhaust Solenoid Valve
and Front and Rear Solenoid Valves. The (ASCM)
limits the compressor pump operation time to 170 to
190 seconds. This controlled operation time is to pre- vent damage to the compressor motor.
To prevent excessive cycling between the compres-
sor and the exhaust solenoid circuits during normal
ride conditions. A 14 to 16 second delay is incorpo-
rated in the microprocessor logic. The system is non-operation when one of the fol-
lowing conditions exists. A door(s) is/are open, the
trunk is open, the service brake is applied or the
throttle position sensor is 65% to 100% open. System
operation is inhibited during high speed cornering
activities or if there is a charging system failure.
The control module is on the CCD bus system.
COMPRESSOR ASSEMBLY
The compressor assembly is driven by an electric
motor and supplies air pressure between 930 to 1241
kPa (135 to 180 psi) (Fig. 3). A solenoid operated ex-
haust valve. Located in the compressor head assem-
bly, releases air when energized. A heat actuated circuit breaker. Located inside the
compressor motor housing. Is used to prevent damage
to the compressor motor in case of control module
failure.
COMPRESSOR AIR DRYER
The air dryer is attached to the compressor (Fig. 3).
This component serves two purposes. It absorbs mois-
ture from the atmosphere before it enters the system
Fig. 2 Front and Rear Air Springs
2 - 74 SUSPENSION AND DRIVESHAFTS Ä

Page 133 of 2438

CHEVROLET PLYMOUTH ACCLAIM 1993 Service Manual and with internal valving maintains a residual pres-
sure of 172 to 276 kPa (25 to 40 psi).
AIR LINES
Nylon air lines (4) are routed from the compressor
(air dryer) to each strut/spring assembly. Ri

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CHEVROLET PLYMOUTH ACCLAIM 1993 Service Manual Fig. 5 Air Lines Rear, and Rear Height Sensor
2 - 76 SUSPENSION AND DRIVESHAFTS Ä

Page 135 of 2438

CHEVROLET PLYMOUTH ACCLAIM 1993 Service Manual 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 fitt

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.
² Air line to compressor connectors.
² Air line to solenoid.
(2) Check the rubber membranes.
² Front struts.
² Rear springs.
Fig. 6 Release Air Line from Fitting
Fig. 7 Push Air Line into Fitting
Fig. 8 Pressure Gauge Installed in System
Ä SUSPENSION AND DRIVESHAFTS 2 - 77

Page 136 of 2438

CHEVROLET PLYMOUTH ACCLAIM 1993 Service Manual (3) Check solenoid to volume canister joint.
² Front strut to solenoid valve connection.
² Rear spring to solenoid valve connection.
(4) Check air line for ruptures, cuts, splits or heat
damage

(3) Check solenoid to volume canister joint.
² Front strut to solenoid valve connection.
² 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.
² The trunk and all doors are closed.
² The engine speed exceeds 600 R.P.M.
² Throttle angle is less than 65 degrees.
² The brake is not applied.
² You are not cornering above 10 mph.
² 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:
² The trunk and all doors are closed.
² 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:
² The trunk is open.
² A door(s) is/are open.
² The brake pedal is engaged.
² The throttle is at the wide open position.
² 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.
² Use DRB II tester and 1991 Chassis (Air Suspen-
sion) service cartridge.
² Follow DRB II requirements to cancel shipping
height message in the body computer.
² 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.
² Set shipping command in the body computer using
the DRB II and the 1991 Chassis (Air suspension)
service cartridge.
² Disconnect the I.O.D. connector.
DIAGNOSIS
INITIAL DIAGNOSTIC CHECK
(1) Check for blown or missing fuses.
Fig. 9 Compressor Current Draw Test
2 - 78 SUSPENSION AND DRIVESHAFTS Ä

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