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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1863 (Engine Controls And Fuel - 2.4L (Lat) - DTC P0420 To DTC P2544) >> DTC P2172 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ensure proper operation of the CKP sensor. Refer to DTC P0335 or P0336 .
  2. Ensure proper operation of the transmission output speed sensor (OSS). Refer to DTC P0722 (2.4L HYBRID) .
  3. Inspect for any condition that can increase idle speed.
    • Vacuum leaks
    • Un-metered air entering the engine, after the mass airflow
    • A faulty positive crankcase ventilation (PCV) valve
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