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Home >> Cadillac >> 2010 >> STS 3.6 V, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 18 (Engine Controls And Fuel - 4.6L (LH2) - DTC P0335 To DTC P2544) >> DTC P0506 or P0507 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
  1. 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-Refer to Throttle Body Inspection and Cleaning .
    • Restricted exhaust-Refer to Restricted Exhaust .
    • Mechanical conditions that limit engine speed
  2. Inspect for any condition that can increase idle speed.
    • Vacuum leaks
    • Unmetered air entering the engine, after the mass air flow
    • A faulty positive crankcase ventilation (PCV) valve
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