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Home >> Cadillac >> 2008 >> STS V >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Panel System Displays & Gages >> Diagnostic Information and Procedures >> Engine Oil Pressure Indicator Always On >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the engine oil pressure (EOP) sensor.
  2. Ignition OFF, test for less than 1.0 ohm of resistance between the low reference circuit terminal A and ground.
    • If greater than the specified range, test the circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
  3. Ignition ON, test for 4.8-5.2 volts between the appropriate 5-volt reference circuit terminal and ground.
    • 5-volts reference circuit terminal B (LY7)
    • 5-volts reference circuit terminal C (LH2 and LC3)
    • If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
    • If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the ECM.
  4. Verify the scan tool Engine Oil Pressure Sensor parameter is less than 0.2 volt.
    • If greater than the specified range, test the appropriate signal circuit terminal below for a short to voltage. If the circuit tests normal, replace the ECM.
      • Oil pressure switch signal circuit terminal C (LY7)
      • Oil pressure switch signal circuit terminal B (LH2 and LC3)
  5. Install a 3A fused jumper wire between the appropriate signal circuit terminal and the appropriate 5-volt reference circuit terminal. Verify the scan tool Engine Oil Pressure Sensor parameter is greater than 4.8 volts.
    • If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
  6. Ignition ON, command the indicators OFF with the scan tool.
    • If the EOP indicator does not turn OFF, replace the IPC.
  7. If all circuits test normal, replace the EOP sensor.
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