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Test X: One Or More Corners Low, No Codes Retrieved & Compressor Inoperative

  1. Check For Pinched Air Line  Disconnect air line from air compressor and air spring solenoid. Connect a vacuum pump to one end of disconnected line. Apply vacuum. If vacuum does not hold, go to next step. If vacuum holds, service pinched or obstructed air line as necessary. Repeat ON-DEMAND SELF-TEST and PNEUMATIC TEST under DIAGNOSTIC TEST MODE  .
  2. Check For Leaking Air Line  Reinstall one end of air line in a known good air spring. Connect a vacuum pump to other end of air line. Apply vacuum. If vacuum holds, go to next step. If vacuum does not hold, repair leak in air line as necessary. Repeat ON-DEMAND SELF-TEST and PNEUMATIC TEST under DIAGNOSTIC TEST MODE  .
  3. Check Solenoid Function  Hook-up New Generation Star (NGS) tester. See EQUIPMENT HOOK-UP  under TESTING & DIAGNOSIS. Rotate dial (on scan tester) to menu item DIAGNOSTIC DATA LINK, and press trigger to select. Select VDM-VEHICLE DYNAMICS MODULE. Select ACTIVE COMMAND MODES. Select AIR SUSPENSION CONTROLS. Select PIDs. On 1996 models, select ASLFSOL, ASRFSOL, ASRRSOL or ASLRSOL. On 1997 models, select LRSOL or RRSOL. On all models, press start (button 3). Command SOLENOID: ON. Using compressed shop air, attempt to inflate air spring. If air flows into spring, go to next step. If air does not flow into spring, replace solenoid. Repeat ON-DEMAND SELF-TEST and PNEUMATIC TEST under DIAGNOSTIC TEST MODE  .
  4. Check For Maximum Pressure  Install pressure gauge in air compressor drier air line port. With solenoid still on, command COMPRESSOR: ON and observe pressure gauge. If pressure reaches a minimum of 150 psi, go to next step. If pressure does not reach 150 psi, replace compressor assembly. Repeat ON-DEMAND SELF-TEST and PNEUMATIC TEST under DIAGNOSTIC TEST MODE  .
  5. Check Holding Pressure  With air pressure at a minimum of 150 psi, command COMPRESSOR: OFF and observe pressure gauge. If pressure holds, no problem is indicated at this time. Repeat ON-DEMAND SELF-TEST and PNEUMATIC TEST under DIAGNOSTIC TEST MODE  . If pressure leaks down, replace compressor drier assembly. Repeat ON-DEMAND SELF-TEST and PNEUMATIC TEST under DIAGNOSTIC TEST MODE  .
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