Pneumatic Test

Pneumatic Test
This test verifies that the air tubes are connected and that they are not restricted. It also verifies that the air compressor, air compressor vent solenoid and air spring solenoid valves are functioning correctly. This test is used to clear DTCs C1990 and C1991. Verify that the following conditions are met before running the Pneumatic Test.
^ All the doors, the liftgate and the liftgate glass must be closed.
^ The transmission is in PARK.
^ The vehicle speed is less the 10 km/h (6 mph).
^ The ignition switch is in the ON position.
^ The air suspension system is enabled.
^ Battery voltage is greater than 11 volts for the duration of the test.
1. Fulfill the pre-conditions.
2. Install a battery charger for the Pneumatic Test to prevent battery drain.
3. Using the scan tool, carry out the Pneumatic Test.