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Home >> Hummer >> 2008 >> H2 4D Utility Pickup >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 6.2L - DTC P0300 To DTC P1175 >> DTC P0506 or P0507 >> Circuit/System Testing
July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Circuit/System Testing

  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 Cleaning .
    • Restricted exhaust
    • Mechanical conditions that limit engine speed

      Repair any conditions, if necessary.

  2. Inspect for the following conditions:
    • Vacuum leaks
    • A faulty positive crankcase ventilation (PCV) valve
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