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Oil Pressure Diagnosis and Testing

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Special Tools

    Fig 1: View Of Special Tools Oil Pressure Gage & Adapter
    GM1658100Courtesy of GENERAL MOTORS COMPANY
  1. Review the system operation in order to familiarize yourself with the system functions. As required, disable the auto-stop function prior to repair. Refer to Hybrid Modes of Operation Description .
  2. With the vehicle on a level surface, run the vehicle for a few minutes. Allow adequate drain down time, 2-3 minutes, and measure the oil level.
  3. If required, add the recommended grade engine oil and fill the crankcase until the oil level measures full on the oil level indicator.
  4. Run the engine briefly, 10-15 seconds, and verify low or no oil pressure on the vehicle gauge or light.
  5. Listen for a noisy valve train or a knocking noise.
  6. Inspect for the following conditions:
    • Oil diluted by water or glycol antifreeze

      Refer to Coolant in Engine Oil .

    • Foamy oil, which may be caused by a cut or damaged oil pump screen O-ring seal
  7. Remove the oil filter and install the EN-47971  oil pressure gauge adapter (1).
  8. Install the J 21867  pressure gauge (2), or equivalent to the EN-47971  oil pressure gauge adapter (1).
  9. Run the engine and measure the engine oil pressure.
  10. Compare the readings to Engine Mechanical Specifications .
  11. If the engine oil pressure is below specifications, inspect the engine for 1 or more of the following conditions:
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