Removal & Installation
Before servicing any air suspension component, disconnect power to the system by turning the air suspension switch OFF or by disconnecting the negative battery cable. Do not remove an air spring under any circumstances when there is pressure in the air spring. Do not remove any components supporting an air spring without either exhausting the air or providing support for the air spring.
- Turn the air suspension switch OFF .
- Raise and safely support the vehicle on the frame. The suspension must be fully down with no load.
- Remove the heat shield, as required. Remove the spring retainer clip.
Remove the air spring solenoid as follows:
- Disconnect the electrical connector and then disconnect the air line.
- Remove the solenoid clip.
- Rotate the solenoid counterclockwise to the first stop.
- Pull the solenoid straight out slowly to the second stop to bleed air from the system.
Do not fully release the solenoid until the air is completely bled from the air spring or personal injury may result.
- After the air is fully bled from the system, rotate counterclockwise to the third stop and remove the solenoid from the solenoid housing. Remove the large O-ring from the solenoid housing.
Remove the spring piston-to-axle spring seat as follows:
- Insert air spring removal tool T90P-5310-A or equivalent, between the axle tube and the spring seat on the forward side of the axle.
- Position the tool so its flat end rests on the piston knob. Push downward, forcing the piston and retainer clip off the axle spring seat.
- Remove the air spring.
Install the air spring solenoid as follows:
- Check the solenoid O-rings for cuts or abrasion. Replace the O-rings as required. Lightly grease the O-ring area of the solenoid and the larger solenoid housing O-ring with silicone dielectric compound.
- Insert the solenoid into the air spring end cap and rotate clockwise to the third stop, push in to the second stop, then rotate clockwise to the first stop.
- Install the solenoid clip. Inspect the wire harness connector and ensure the rubber gasket is in place at the bottom of the connector cavity.
- Install the air spring into the frame spring seat, taking care to keep the solenoid air and electrical connections clean and free of damage.
- Connect the push on spring retainer clip to the knob of the spring cap from the top side of the frame spring seat.
- Connect the air line and electrical connector to the solenoid. Install the heat shield to frame spring seat, if required.
- Align the air spring piston to axle seats. Squeeze to increase pressure and push downward on the piston, snapping the piston to axle seat at rebound and supported by the shock absorber.
The air springs may be damaged if the suspension is allowed to compress before the spring is inflated.
Refill the air spring as follows:
- Turn the air suspension switch ON . The ignition switch must be ON and the engine running or a battery charger must be connected to the battery to reduce battery drain.
- Fold back or remove the right luggage compartment trim panel and connect SUPER STAR II tester 007-0041-A or equivalent to the air suspension diagnostic connector, which is located near the air suspension switch.
- Set the tester to EEC-IV/MCU mode. Also set the tester to FAST mode. Release the tester button to the HOLD (up) position and turn the tester ON .
- Depress the tester button to TEST (down) position. A Code 10 will be displayed. Within 2 minutes, a Code 13 will be displayed. After Code 13 is displayed, release the tester button to HOLD (up) position, wait 5 seconds, and depress the tester button to TEST (down) position. Ignore any codes displayed.
- Release the tester button to the HOLD (up) position. Wait at least 20 seconds, then depress the tester button to TEST (down) position. Within 10 seconds, the codes will be displayed in the order shown.
- Within 4 seconds after Code 26/28 is displayed, release the tester button to the HOLD (up) position. Waiting longer than 4 seconds may result in Functional Test 31 being entered. The compressor will fill the air springs with air as long as the tester button is in the HOLD (up) position. To stop filling the air springs, depress the tester button to the TEST (down) position.
It is possible to overheat the compressor during this operation. If the compressor overheats, the self-resetting circuit breaker in the compressor will open and remain open for about 15 minutes. This allows the compressor to cool down.
- To exit Functional Test 26/28, disconnect the tester and turn the ignition switch OFF .
- Lower the vehicle.