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Oil Pressure Diagnosis and Testing: Procedure

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  1. Remove the engine oil pressure sensor (1).
    Fig 1: Engine Oil Pressure Sensor
    GM3657733Courtesy of GENERAL MOTORS COMPANY
  2. Install the EN-21867-850  adapter (1).
    Fig 2: Adapter And Gauge
    GM3657734Courtesy of GENERAL MOTORS COMPANY
  3. Install the CH-48027  gauge (2).
  4. Start the engine.
  5. Check oil pressure.
  6. At idling speed, the oil pressure must be greater than 180 kPa (26.11 psi) and the oil temperature must be 85°C (185°F) or more.
  7. Remove the CH-48027  gauge (2).
  8. Remove the EN-21867-850  adapter (1).
  9. Turn off the engine.
  10. Install the engine oil pressure sensor (1).
    Fig 3: Engine Oil Pressure Sensor
    GM3657733Courtesy of GENERAL MOTORS COMPANY
  11. Tighten the sensor to 35 N.m (26 lb ft).
  12. Check the engine oil level.
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