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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 140 (Suspension Control System - Suspension Leveling) >> Diagnostic Information and Procedures >> DTC C0660 >> Component Testing

Component Testing

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  1. Ignition OFF, disconnect the air compressor harness connector.
  2. Test the exhaust valve for 18-45 ohms of resistance between the control terminal and the battery positive terminal.
    • If resistance is not within the specified range, replace the air compressor.
  3. Test for infinite resistance between the control terminal and ground.
    • If less than infinite resistance, replace the air compressor.
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