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System Operation Test

  1. Place vehicle on flat surface. Remove heavy items from vehicle. Measure distance between floor and a suitable spot on rocker panel, forward of rear wheelwell opening. This distance is unloaded height. Turn ignition on. Add 300 lbs. (136 kg) of weight to rear of vehicle. If compressor starts within 8-15 seconds, go to step 4).
  2. If compressor does not start within 8-15 seconds, and vehicle is within one inch (25.4 mm) of unloaded height measured in step 1), go to AIR DRIER TEST  under COMPONENT TESTING.
  3. If compressor does not start within 8-15 seconds, and vehicle is not within one inch (25.4 mm) of unloaded height, adjust height sensor, then retest system. See HEIGHT SENSOR  under ADJUSTMENTS. If compressor still does not start within 8-15 seconds, go to COMPRESSOR INOPERATIVE  under ELECTRICAL TESTING.
  4. If compressor stops within 7 minutes, go to next step. If compressor runs continuously, go to HEIGHT SENSOR TEST  under COMPONENT TESTING.
  5. If system leaks down, go to COMPRESSOR LEAK TEST  under COMPONENT TESTING. If vehicle returns to within one inch (25.4 mm) of unloaded height, go to step 7).
  6. If vehicle does not return to within one inch (25.4 mm) of unloaded height, adjust height sensor and retest system. See HEIGHT SENSOR  under ADJUSTMENTS. If vehicle still does not return to within one inch (25.4 mm) of unloaded height, go to VEHICLE WILL NOT LOWER  under ELECTRICAL TESTING.
  7. Remove 300 lbs. (136 kg) of weight from rear of vehicle. If system does not exhaust within 8-15 seconds, go to VEHICLE WILL NOT LOWER  under ELECTRICAL TESTING. If system exhausts within 8-15 seconds, but vehicle does not return to within one inch (25.4 mm) of unloaded height, adjust height sensor. See HEIGHT SENSOR  under ADJUSTMENTS.
  8. If system exhausts within 8-15 seconds, and after 2 minutes the vehicle returns to within one inch (25.4 mm) of unloaded height, system is operating correctly.
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