System Leak Test

^ Tool Required:
- J 22124-B Pressure Gage
- Or Equivalent

This test will determine if there is a leak in the system external to the compressor assembly.
1. Raise and suitably support vehicle.
2. Install pressure gage J 22124-B into the Electronic Level Control (ELC) system at the dryer assembly so that the shut-off valve is on the compressor side of the gage.
3. With the shut-off valve open (up), apply shop air pressure through the service valve on the gage until the gage reads 100 - 120 psi.
4. If a leak is indicated, close the shut-off valve (down) and continue to observe the pressure drop. Closing the valve isolates the compressor from the remainder of the system.
^ If the gage pressure continues to drop, the leak is external to the compressor. Leak test all connections with a soap and water or leak test solution.
^ If the gage pressure does not continue to drop, the leak is internal to the compressor. Check for leaks.
5. If pressure builds up rapidly but vehicle does not raise, check for pinched air tubes or seized shocks.