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Home >> Cadillac >> 1997 >> Seville STS >> Repair and Diagnosis >> Suspension >> Electronic Suspension >> Rear Suspension - Electronic Level Control- DEVILLE CONCOURS, ELDORADO & SEVILLE >> System Testing >> ELC System Leak/Performance Test

ELC System Leak/Performance Test

  1. If ELC air compressor assembly and air lines have been replaced, go to step 7). If ELC air compressor assembly and air lines have not been replaced, go to next step.
  2. Raise and support vehicle. Check air lines from air drier to both rear shock absorbers. Check air line connection at air drier. If air lines are damaged or disconnected, go to step 13). If air lines are okay, go to next step.
  3. Squeeze middle of left rear shock absorber sleeve. If sleeve can be slightly compressed, go to step 5). If sleeve can not be compressed, go to next step.
  4. Turn ignition off. Connect scan tool to Data Link Connector (DLC) under left side of instrument panel. Turn ignition on, with engine off. Using scan tool, select RSS OUTPUTS, and then RS 006 (ELC COMP). Cycle air compressor. Operate air compressor for 60 seconds. Using a soap and water solution, check air line connection at air drier for leaks. If leaks are found and repaired, go to step 16). If no leaks are found, go to next step.
  5. Turn ignition off. Disconnect air line from air drier. Connect Pressure Gauge (J 22124-B ) to air drier. Close pressure gauge toggle valve. Disconnect RSS control module connector. RSS control module is located in right front corner of trunk. Turn ignition on, with engine off. Connect a jumper between ELC compressor relay control circuit terminal (Yellow wire) of RSS control module harness connector and ground. See WIRING DIAGRAMS  . Air compressor should activate. If pressure builds to 80 psi (5.6 kg/cm2 ), go to next step. If pressure does not build to 80 psi (5.6 kg/cm2 ), go to step 10).
  6. When pressure builds to 80 psi (5.6 kg/cm2 ) remove jumper to turn air compressor off. Monitor pressure gauge for one minute. If pressure leaks down, go to step 10). If pressure does not leak down, go to next step.
  7. Connect pressure gauge to right rear shock absorber. Pressure gauge toggle valve should be positioned on side away from shock absorber. Close pressure gauge toggle valve. Apply shop air into pressure gauge schrader valve until pressure gauge indicates 80 psi (5.6 kg/cm2 ). Monitor pressure gauge for one minute. If pressure leaks down, go to step 11). If pressure does not leak down, go to next step.
  8. Slowly open pressure gauge toggle valve to release air pressure. Disconnect pressure gauge from right rear shock absorber. Connect pressure gauge to left rear shock absorber. Pressure gauge toggle valve should be positioned on side away from shock absorber. Close pressure gauge toggle valve. Apply shop air into pressure gauge schrader valve until pressure gauge indicates 80 psi (5.6 kg/cm2 ). Monitor pressure gauge for one minute. If pressure leaks down, go to step 12). If pressure does not leak down, go to next step.
  9. Slowly open pressure gauge toggle valve to release air pressure. Disconnect pressure gauge from left rear shock absorber. Connect pressure gauge to left and right rear air line connections. Reconnect air line to air drier. Open pressure gauge toggle valve. Apply shop air into pressure gauge schrader valve until pressure gauge indicates 80 psi (5.6 kg/cm2 ). Monitor pressure gauge for one minute. If pressure leaks down, go to step 14). If pressure does not leak down, go tostep 19).
  10. Replace ELC air compressor assembly. Replace air lines. After repairs, go to step 19).
  11. Slowly open pressure gauge toggle valve to release air pressure. Replace right rear shock absorber. Reconnect all air lines. After repairs, go to step 19).
  12. Slowly open pressure gauge toggle valve to release air pressure. Replace left rear shock absorber. Reconnect all air lines. After repairs, go to step 19).
  13. If any air lines are damaged, go to next step. If air lines are okay, go to step 18).
  14. Replace air line from air drier to rear shock absorbers. After repairs, go to next step.
  15. Remove air drier from ELC air compressor assembly. With head-connection end down, shake air drier. If water/moisture comes out of air drier when shaken, go to next step. If water/moisture does not come out of air drier when shaken, go to step 17).
  16. Replace air drier. After repairs, go to next step.
  17. Replace air compressor head. After repairs, go to next step.
  18. Install ELC air compressor assembly onto vehicle. Reconnect all air lines. After repairs, go to next step.
  19. Turn ignition off. Reinstall/reconnect all components/connectors. Turn ignition on, with engine off. Clear road-sensing suspension codes. Wait 5 minutes. If rear of vehicle is level, system is okay.
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