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DTC C0662 Or C0663: Level Control Exhaust Valve Circuit Malfunction: Notes

  1. Perform diagnostic system check. See DIAGNOSTIC SYSTEM CHECK  . After performing diagnostic system check, go to next step.
  2. Install scan tool. Turn ignition switch on. Using scan tool, command ALC Exhaust Solenoid ON and OFF. If ALC exhaust solenoid turns on and off with each command, go to DIAGNOSTIC AIDS  . If ALC exhaust solenoid does not turn on and off with each command, go to next step.
  3. Turn ignition switch off. Disconnect ALC exhaust solenoid harness connector. Turn ignition switch on. Using a test light connected to a good ground, probe coil side feed circuit of ALC exhaust solenoid harness connector. See WIRING DIAGRAMS  . If test light illuminates, go to next step. If test light does not illuminate, go to step  10 .
  4. Connect test light between harness connector of ALC exhaust solenoid coil side feed and control circuit. See WIRING DIAGRAMS  . Using scan tool, command ALC exhaust solenoid on and off. If test light turns on and off with each command, go to step  8 . If test light did not turn on and off with each command, go to next step.
  5. If test light remained illuminated with each on and off command, go to step  7 . If test light did not remain illuminated with each on and off command, go to next step.
  6. Check ALC exhaust solenoid control circuit for an open. See WIRING DIAGRAMS  . If an open was found and repaired, go to step  13 . If an open was not found, go to step  9 .
  7. Check ALC exhaust solenoid control circuit for a short to ground. If a short to ground was found and repaired, go to step  13 . If a short to ground was not found, go to step  9 .
  8. Check ALC exhaust solenoid harness connector for a poor connection. If a poor connection was found and repaired, go to step  13 . If a poor connection was not found, go to step  11 .
  9. Check suspension control module harness connector for a poor connection. If a poor connection was found and repaired, go to step  13 . If a poor connection was not found, go to step  12 .
  10. Repair ALC exhaust solenoid coil side feed circuit. If circuit repair is complete, go to step  13 .
  11. Replace ALC compressor head. See AUTOMATIC LEVEL CONTROL WITH CVRSS article. If replacement is complete, go to step  13 .
  12. Replace suspension control module. See ESC/CVRSS CONTROL MODULE  under REMOVAL & INSTALLATION. Calibrate NEW control module. See CALIBRATING ESC/CVRSS CONTROL MODULE  under ADJUSTMENTS. If replacement is complete, go to next step.
  13. Using scan tool, clear DTCs. Operate vehicle under normal driving conditions. If DTC resets, go to step  2 . If DTC does not reset, system is okay.
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