Residual Air Check

When diagnostic procedures require that vehicle be raised on a hoist, it is important that the rear axle assembly remains in the normal trim height position at all times. When a frame contact hoist is used, two additional jack stands should be used to support the rear axle or control arms in the normal trim height position.

Fig. 20 Compressor Performance Test:

1. Remove air line from dryer fitting and attach air line from pressure gauge tool No. J 22124-A or equivalent to dryer fitting as shown in Fig. 20.
2. Disconnect electrical connection to pump and jumper 12 volt dark green wire terminal to run compressor. Pump should run until a pressure of 100 psi is reached.
3. Disconnect wiring from compressor exhaust solenoid and jumper 12 volt to one terminal and ground the other terminal to the exhaust system.
4. Air should be exhausted from the system until gauge indicates 7-14 psi.