Tech Tip: Servicing Bravada Electronic Controlled Air Suspensions

Tech Tip: Servicing Bravada Electronic Controlled Air Suspensions

I borrowed a friend's 2002 Oldsmobile Bravada to pick up some supplies from the local home improvement store. After loading it with weekend-warrior bounty, I started the vehicle and noticed that the rear end was sitting low. The Electronic Controlled Air Suspension (ECAS) compressor was running, but the back end would not return to normal ride height. I found the compressor check valve sticking in the compressor housing, not allowing the compressor to build pressure and raise the rear.

I borrowed a friend’s 2002 Oldsmobile Bravada to pick up some supplies from the local home improvement store. After loading it with weekend-warrior bounty, I started the vehicle and noticed that the rear end was sitting low. The Electronic Controlled Air Suspension (ECAS) compressor was running, but the back end would not return to normal ride height. I found the compressor check valve sticking in the compressor housing, not allowing the compressor to build pressure and raise the rear. Good thing that GM has a ECAS Compressor Service Kit, P/N 15183676, to fix the problem.

Applicable Vehicles:
• 2002 GMC Envoy/Envoy XL (new body style) with electronically controlled air suspension (RPO G67); and
• 2002 Oldsmobile Bravada (new body style).

Repair Procedure:
(Review safety procedures in the ALLDATA system before beginning.)

Important: Do not replace ECAS compressor P/Ns 15094346 or 15745306.

Caution: A sudden release of pressure may cause personal injury or damage to the vehicle. The air suspension system is under pressure until the air supply lines are disconnected. Wear gloves, ear protection, and eye protection. Wrap a clean cloth around the air supply lines.

Important:
• Depressurize the air suspension system only after the rear axle is supported and is set between D- Height and Full Jounce.

• Remove the air suspension system fuse before working on the rear suspension components or the rear axle. Failure to remove the air suspension system fuse could cause the calibration of the air suspension leveling sensor to change and the air suspension system not to function properly.

1. Remove the #1 30-amp ECAS fuse from the UBEC.

2. Lower the spare tire (Envoy XL only).

3. Raise and support the vehicle.

4. Remove the air spring compressor to frame mounting bolts.

5. Disconnect the air inflator switch electrical connections, the air supply lines and the air spring compressor vent hose from the air spring compressor.

6. Remove the air spring compressor from the vehicle.

7. Clean the ECAS cylinder head area with brake cleaner and compressed air.

8. Remove the air compressor valve cylinder head screws (1) using a T25 TORX bit and remove the cylinder head (2).

9. Remove the 0-ring (3), the spring (4) and the check valve (5).

Important: DO NOT allow any foreign material to fall into the compressor head.

10. Clean the old thread locking compound from the aluminum body (6) tapped holes using a M5 x 0.8 thread cleaning tool.

11. Clean any foreign material away from the sealing area.

Important: The new check valve (5) and 0-ring (3) come pre-greased. DO NOT add additional grease.

• The groove in the cylinder head (2) must be installed facing the compressor (6) in order to properly retain the 0-ring.

12. Install the new pre-greased check valve (5), the spring (4), the 0-ring (3), the cylinder head (2) and the screws (1) from the service kit, P/N 15183676. Tighten the cylinder head screws (1) to 5 Nm (44 lb. in.).

Important: Ensure that the color on the air supply lines match the color on the air spring compressor for reassembly. The right side line is clear and the left side line is black. Right and left is also indicated on the compressor.

13. Install the air supply lines with existing fittings to the air spring compressor. Tighten to 2.25 Nm (18.5 lb. in.).

14. Connect the air inflator switch electrical connections, the air supply line and the air spring compressor vent hose to the air spring compressor.

15. Install the air spring compressor to frame mounting bolts. Tighten to 25 Nm (18 lb. ft.). Inspect the rear air springs for proper seating before inflating the rear air springs.

16. Lower the vehicle.

17. Install the spare tire (Envoy XL model).

18. Install the # 1 30-amp ECAS fuse in the UBEC.

19. Start the engine and run for approximately one to three minutes to ensure that the air spring leveling system is functioning properly.

20. Inspect the D height.

21. Inspect for air leaks.

Written by ALLDATA Technical Editor, Eric Seifert.

For additional information, visit www.alldata.com.

You May Also Like

Non-Competes

The FTC’s rule is set to take effect in about four months, unless it is blocked by legal challenges.

A Non-Starter, Says FTC

As you read ShopOwner, whether it is in print or online, one thing – hopefully – comes across clearly: our mission is to help your shop be more successful.

Sometimes, that is evident through solid marketing advice, updated technical resources or inspirational messages about other successful shop owners who deal with challenges in creative ways. Typically, each issue of our magazine contains all three – and then some.

Eaton Introduces Fuse Portfolio for Electrified CVs

Eaton Bussmann series fuses can handle up to 1,400 amps and 900 volts, and can be tailored to customer specifications.

Succession Planning – Navigating The Legal Landscape

Planning for a successful business handover means doing things by the book.

Genesis Expands EV Availability to 37 States

GV60, Electrified GV70 and Electrified G80 are now available at select retailers in Alabama, Kansas, Oregon and Rhode Island.

Driveshaft, Axle and Drivetrain Noise FAQs

Follow along to learn more about these unwanted noises.

Other Posts

Non-Directional Rotor Finishes

Today, non-directional finishes on new brake rotors still serve the same purpose, but they also help in the bedding of some friction formulations.

PRT Launches 59 New Complete Strut Assemblies

Extending PRT’s product portfolio in North America, the new release represents nearly 12M vehicles in new coverage.

We Want Your Thoughts On Electronic Power Steering

Your opinion matters us and can be profitable for you too! Share your ideas with us.

Brake Problems

Reducing brake drag on late-model vehicles is not accomplished by a single component; it takes a system.