- •GENERAL INFORMATION
- •FRONT SUSPENSION
- •STEERING KNUCKLE
- •LOWER CONTROL ARM
- •DRIVESHAFTS
- •FRONT SUSPENSION SERVICE PROCEDURES
- •WHEEL ALIGNMENT
- •WHEEL ALIGNMENT SERVICE PROCEDURE
- •STRUT DAMPER ASSEMBLY
- •REMOVAL
- •INSPECTION
- •INSTALLATION
- •DISASSEMBLY (STRUT DAMPER)
- •ASSEMBLE (STRUT DAMPER)
- •SUSPENSION COIL SPRINGS
- •SPRING RETAINER UPPER
- •SPRING SEAT LOWER
- •SHOCK ABSORBERS (Strut Damper)
- •INSPECTION
- •LOWER CONTROL ARM
- •REMOVAL (ASSEMBLY)
- •INSTALLATION (ASSEMBLY)
- •LOWER CONTROL ARM PIVOT BUSHINGS
- •LARGE BUSHING
- •SMALL BUSHING
- •SMALL BUSHING
- •LARGE BUSHING
- •BALL JOINTS
- •INSPECTION BALL JOINT WEAR
- •BALL JOINT REMOVAL
- •BALL JOINT INSTALLATION
- •BALL JOINT SEAL INSTALLATION
- •SWAY BAR
- •REMOVAL
- •INSPECTION
- •INSTALLATION
- •KNUCKLE (FRONT SUSPENSION)
- •REMOVAL
- •INSTALL
- •HUB AND BEARING ASSEMBLY
- •REMOVAL
- •INSTALLATION
- •DRIVESHAFTS
- •GENERAL INFORMATION
- •DRIVESHAFT IDENTIFICATION
- •SERVICE PROCEDURES
- •DRIVESHAFTS, REMOVE INSTALL
- •HUB NUT REMOVAL
- •DRIVESHAFT ASSEMBLIES REMOVE
- •HUB NUT INSTALL
- •DRIVESHAFT RECONDITIONING PROCEDURE
- •DISASSEMBLE
- •TRIPOD REMOVAL FROM INTERCONNECTING BAR
- •INSPECT TRIPOD AND HOUSING
- •DISASSEMBLE
- •WEAR SLEEVE
- •INSPECT
- •ASSEMBLE
- •INTERMEDIATE SHAFT ASSEMBLY RECONDITION
- •INTERMEDIATE SHAFT ASSEMBLY
- •UNIVERSAL JOINT AND ROLLER
- •INTERMEDIATE SHAFT ASSEMBLY
- •BOOTS INSPECT
- •BOOTS INSTALL
- •DAMPER WEIGHTS
- •DRIVESHAFT POSITIONING SPECIFICATIONS
- •REAR SUSPENSION
- •GENERAL INFORMATION
- •SHOCK ABSORBERS
- •REMOVAL
- •INSPECTION
- •INSTALLATION
- •COIL SPRINGS AND JOUNCE BUMPER
- •REMOVAL
- •INSTALLATION
- •REMOVAL
- •INSTALLATION
- •PIVOT BUSHING AC AND AY BODY
- •REMOVE FROM VEHICLE
- •PIVOT BUSHING INSTALLATION
- •PIVOT BUSHING AC AG AJ AP BODY
- •REMOVE FROM VEHICLE
- •PIVOT BUSHING INSTALLATION
- •REAR AXLE ASSEMBLY
- •REMOVE
- •INSTALLATION
- •AUTOMATIC AIR LOAD LEVELING SYSTEM
- •GENERAL INFORMATION
- •MAJOR COMPONENTS
- •COMPRESSOR ASSEMBLY
- •CONTROL MODULE
- •HEIGHT SENSOR
- •AIR LINES AND FITTINGS
- •COMPRESSOR RELAY
- •AIR ADJUSTABLE SHOCK ABSORBERS
- •AIR DRYER
- •LEAK CHECKS
- •SYSTEM OPERATION
- •RAISING VEHICLE HEIGHT
- •LOWERING VEHICLE HEIGHT
- •COMPRESSOR PERFORMANCE TEST
- •SERVICE PROCEDURES
- •COMPRESSOR ASSEMBLY
- •AUTOMATIC AIR LOAD LEVELING SYSTEM WIRING SCHEMATIC
- •AUTOMATIC AIR LOAD LEVELING SYSTEM WIRING SCHEMATIC
- •REAR LEVELING DIAGNOSTIC PROCEDURES
- •BEFORE DIAGNOSTICS TEST
- •TEST LAMP PIN OPERATION
- •AFTER COMPLETION OF REPAIRS
- •TEST WEIGHT
- •DIAGNOSTICS (TO START PROCESS)
- •IGNITION
- •OPERATION
- •AUTOMATIC AIR LOAD LEVELING DIAGNOSTICS
- •AUTOMATIC AIR LOAD LEVELING DIAGNOSTICS
- •AUTOMATIC AIR LOAD LEVELING DIAGNOSTICS
- •AUTOMATIC AIR LOAD LEVELING DIAGNOSTICS
- •AUTOMATIC AIR LOAD LEVELING DIAGNOSTICS
- •CONTROL MODULE
- •REMOVAL
- •INSTALLATION
- •COMPRESSOR RELAY
- •REMOVAL
- •INSTALLATION
- •REMOVAL
- •INSTALLATION
- •AUTOMATIC AIR SUSPENSION
- •GENERAL INFORMATION
- •FRONT AND REAR AIR SPRINGS
- •HEIGHT SENSOR
- •CONTROL MODULE
- •COMPRESSOR ASSEMBLY
- •COMPRESSOR AIR DRYER
- •AIR LINES
- •AIR LINE FITTINGS
- •AIR CHECK, RESIDUAL
- •COMPRESSOR PERFORMANCE TEST
- •AIR LEAK CHECK
- •SYSTEM OPERATION
- •ENGINE RUN OPERATION
- •ENGINE OFF OPERATION
- •LONG TERM IGNITION OFF OPERATION
- •SYSTEM OPERATION INHIBITORS
- •SYSTEM FAILURES
- •SAFETY CONCERNS
- •SHIPPING MODE
- •DIAGNOSIS
- •INITIAL DIAGNOSTIC CHECK
- •DIAGNOSTICS PROCEDURES
- •HEIGHT SENSOR CHECK
- •HEIGHT SENSOR LOGIC CHART
- •AUTOMATIC AIR SUSPENSION DIAGNOSTICS
- •AUTOMATIC AIR SUSPENSION DIAGNOSTICS
- •AUTOMATIC AIR SUSPENSION DIAGNOSTICS
- •AUTOMATIC AIR SUSPENSION DIAGNOSTICS
- •SERVICE PROCEDURES
- •CONTROL MODULE (ASCM)
- •COMPRESSOR RELAY
- •COMPRESSOR ASSEMBLY
- •AIR DRYER
- •SOLENOIDS (STRUTS AND AIR SPRINGS)
- •REMOVAL
- •INSTALL
- •RECHARGE AIR SPRING
- •AIR SPRINGS REAR
- •REMOVAL
- •INSTALLATION
- •REMOVAL
- •INSTALLATION
- •REAR (STUB) AXLE ALIGNMENT ALL MODELS
- •GENERAL INFORMATION
- •REAR WHEEL ALIGNMENT
- •INSTALLATION OF REAR ALIGNMENT SHIMS
- •SPECIFICATIONS
- •ALIGNMENT SPECIFICATIONS AT CURB HEIGHT
2 - 80 SUSPENSION/DRIVESHAFTS
DIAGNOSIS
INITIAL DIAGNOSTIC CHECK
(1)Check for blown or missing fuses.
(2)Check all connectors for correct assembly.
Check all connectors for incorrectly installed terminals.
(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 measurement 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 suspension diagnostic service cartridge to begin the troubleshooting 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.
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(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 diagnostic 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 wiring diagram, 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 assemblies 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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SUSPENSION/DRIVESHAFTS 2 - 81 |
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Fig. 10 Control Module Connector
2 - 82 SUSPENSION/DRIVESHAFTS |
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AUTOMATIC AIR SUSPENSION DIAGNOSTICS
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SUSPENSION/DRIVESHAFTS 2 - 83 |
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