Файл: 92FWD_2.pdf

2 - 86 SUSPENSION/DRIVESHAFTS

SERVICE PROCEDURES

CONTROL MODULE (ASCM)

REMOVAL

(1)Disconnect negative battery cable.

(2)Remove right side trunk trim panel.

(3)Remove electrical connectors from control module and relay (Fig. 11).

(4)Remove control module mounting screws and remove assembly.

INSTALLATION

(1)Install relay on the control module mounting bracket (if required).

(2)Place control module in mounting position.

(3)Install mounting screws and tighten to 2-3 NIm (19-29 in. lbs.) torque.

(4)Install control module and relay wiring connectors (Fig. 11).

(5)Install right side trunk trim panel.

(6)Connect negative battery cable.

Fig. 11 Control Module and Relay Wiring

COMPRESSOR RELAY

REMOVAL

(1)Remove right side trunk trim panel.

(2)Remove electrical connector from relay.

(3)Remove relay from control module mounting bracket by prying out on locating clip (Fig. 11)

INSTALLATION

(1)Push relay onto bracket (relay will Lock into position.)

(2)Install electrical connector.

Ä

(3) Install trim panel.

COMPRESSOR ASSEMBLY

REMOVAL

(1)Disconnect battery negative cable.

(2)Raise vehicle, see Hoisting, Group 0.

(3)Remove cover from compressor assembly. Remove air hose (see AIR LINES) and electrical connectors (Fig. 12)

(4)Remove compressor assembly mounting screws and lower assembly from vehicle.

(5)Remove mounting bracket screws and slide mounting bracket away from compressor.

Fig. 12 Compressor Assembly

INSTALLATION

(1)Slide mounting bracket on compressor and install screws and tighten to 8 NIm (70 in. lbs.) torque.

DO NOT OVER TORQUE THESE SCREWS.

(2)Install compressor assembly to frame rail and tighten screws to 8 NIm (70 in. lbs.) torque. DO NOT

OVER TORQUE THESE SCREWS.

(3)Connect air hose and electrical connector to compressor assembly.

(4)Install cover on compressor assembly and tighten screws to 6 NIm (40 in. lbs.) torque.

(5)Lower vehicle and connect battery negative

cable.

(6)Check operation of the system.

AIR DRYER

REMOVAL

Remove compressor assembly. See COMPRESSOR ASSEMBLY.

(1)Remove dryer-to-compressor retaining screw (Fig. 13).

(2)Rotate dryer assembly 90° to release retaining tangs from exhaust solenoid housing and withdraw unit.

INSTALLATION

Inspect O-Ring for damage and location on dryer assembly.

(1)Insert and index air dryer locking tangs into exhaust solenoid outlet.

(2)Rotate air dryer assembly to lock position and install air dryer-to-compressor retaining screw (Fig. 13).

Fig. 13 Air Dryer Remove/Install

SOLENOIDS (STRUTS AND AIR SPRINGS)

Front struts and rear springs are equipped with solenoids that control air pressure and volume within the assemblies. The solenoids are electrically operated to allow air input, contain air, or release of air pressure, dependent on control module commands.

REMOVAL

WARNING: DO NOT ATTEMPT TO REMOVE OR INSTALL SOLENOIDS WHILE AIR SUSPENSION (FRONT STRUTS AND REAR AIR SPRINGS) ARE SUPPORTING VEHICLE.

Disconnect negative battery cable. Raise vehicle and remove wheel and tire assembly then remove solenoid(s) as follows:

(1)Separate electrical connection to solenoid.

(2)Disconnect air line, see Air Lines and Fittings. Solenoids have molded square tangs to fit into stepped notches of the air spring housing. The notches provide an air relief position and a retaining position. The retaining position is locked with a retaining clip.

(3)Remove retaining clip (Fig. 14).

Fig. 14 Remove Retaining Clips

(4) Rotate solenoid to first step in housing and allow air pressure to vent (Fig. 15).

Fig. 15 Release Air Pressure

(5) Rotate solenoid to release slot and remove (Fig.

16).

Fig. 16 Remove Solenoid (Inspect O Ring)

INSTALL

(1)Inspect O-Ring condition and position on solenoid stem. (O-Ring can become dislodged during removal (Fig. 16).

(2)Install solenoid with tangs to top ledge of housing and install retaining clip.

(3)Reconnect air line and electrical connection.

STRUT (AIR SUSPENSION) DAMPER ASSEMBLY

Service procedures for removal and installation for (air or steel spring) assemblies are essentially the same. Except for air venting/recharging and disconnecting/connecting air lines and electrical connection.

REMOVAL

(1)Disconnect battery negative cable.

(2)Hoist vehicle and remove wheel and tire assem-

bly.

(3)See AIR LINES AND FITTINGS and disconnect air line.

(4)Disconnect electrical leads, solenoid and height sensors.

(5)See SOLENOIDS (STRUT AND AIR SPRING) and vent air spring and remove solenoids.

(6)See STRUT DAMPER ASSEMBLY in FRONT SUSPENSION and remove strut.

DISASSEMBLY/ASSEMBLE

Disassembly is restricted to upper mount and bearing housing. The strut shock absorber, air spring with integral height sensor, solenoid and wiring harness are serviced as an assembly.

(1)Hold retaining plate locking washer and remove strut rod nut.

(2)Remove locking washer, retainer plate, spacer, flat washer and mount/bearing housing assembly (Fig. 17).

(3)Assemble in reverse order. Hold retainer plate

locking washer with suitable tool and tighten strut rod nut to 75 NIm (55 ft. lbs.) torque.

INSTALLATION

(1)See STRUT DAMPER ASSEMBLY in FRONT SUSPENSION and install strut.

(2)Install solenoid, see: SOLENOIDS (STRUT AND AIR SPRINGS).

(3)Connect electrical leads, solenoid and height sensor.

(4)Charge (inflate) air spring. See RECHARGEAIR SPRING to activate spring solenoid and air compressor. Add air for 60 seconds.

RECHARGE AIR SPRING

To activate compressor; Ground Pin S08 to Pin X20. To Activate Spring Solenoid:

² LF: Ground Pin S31 to X20

Fig. 17 Air Strut Upper Mount Assembly

²RF: Ground Pin S30 to X20

²RR: Ground Pin S32 to X20

AIR SPRINGS REAR

REMOVAL

(1)Disconnect battery negative cable, hoist vehicle and remove wheel and tire assembly.

(2)See AIR LINES AND FITTINGS and disconnect air line and electrical connector from solenoid.

(3)See SOLENOIDS (STRUT AND AIR SPRINGS) and vent air from spring. Remove solenoid.

(4)Release upper air spring alignment/retainer clips. (Fig. 18)

(5)Remove lower spring to axle nut (Fig. 19).

(6)Pry assembly down to pull alignment studs through retaining clips (Fig. 20). Remove assembly.

INSTALLATION

(1)Position assembly lower stud into axle seat and upper alignment pins through frame rail adaptor.

(2)Install upper retaining clips.

(3)Install lower spring to axle nut: LOOSE ASSEMBLE.

(4)Install solenoid and connect air line and electrical connector.

(5)Charge (inflate) air spring. See RECHARGING AIR SPRING and add air for 60 seconds.