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Home >> Buick >> 2007 >> Lucerne CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 231 (Engine Controls - 3.9L - DTC P0442 To P2A01) >> DTC P0506 or P0507 >> Circuit/System Testing

Circuit/System Testing

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  1. Observe the DTC information on the scan tool.
    • If there are any other DTCs set diagnose those first.
  2. Inspect for any condition that can reduce idle speed by increasing engine load.
    • Incorrect torque converter clutch (TCC) operation
    • Accessories that require additional torque to operate
    • Excessive deposits in the throttle body
    • Restricted exhaust
    • Mechanical conditions that limit engine speed
      • Repair any conditions, if necessary.
  3. Inspect for the following conditions:
    • Vacuum leaks
    • A faulty positive crankcase ventilation (PCV) valve
    • Repair any conditions, if necessary.
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