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Home >> Pontiac >> 2009 >> Vibe Base, 2.4 0, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 57 (Suspension Control System - Suspension Leveling) >> Diagnostic Information and Procedures >> DTC C0660 (W/O F55) >> Circuit/System Testing (W/O F55)

Circuit/System Testing (W/O F55)

WARNING: This page is about a different car, the 2009 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.
    IMPORTANT: Whenever repairing and/or replacing ALC system components, perform the Suspension Position Calibration procedure.
  1. Ignition OFF, disconnect the harness connector at the automatic level control (ALC) compressor.
  2. Verify that a test lamp illuminates between the B+ circuit terminal C and ground.
    • If the test lamp does not illuminate, test the B+ circuits for a short to ground or an open/high resistance.
  3. Connect a test lamp between the B+ circuit terminal C and the control circuit terminal A.
  4. With a scan tool, clear all ALC DTCs.
  5. Command the exhaust valve ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
    • If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the ALC sensor/module.
    • If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ALC sensor/module.
  6. If all circuits test normal, test or replace the ALC compressor.
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