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Home >> Cadillac >> 2009 >> STS V >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Panel System Displays & Gauges >> Diagnostic Information and Procedures >> DTC P0521, P0522, or P0523 >> 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 between the low reference circuit terminal listed below and ground.
    • Low reference circuit terminal A (LH2/LC3)
    • Low reference circuit terminal C
    • If greater than the specified range, test the low reference 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 5-volt reference circuit listed below and ground.
    • 5-volt reference circuit terminal A
    • 5-volt reference circuit terminal C (LH2/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 signal circuit terminal B for a short to voltage. If the circuit tests normal, replace the ECM.
  5. Install a 3A fused jumper wire between the signal circuit terminal B and the 5-volt reference circuit listed below. Verify the scan tool Engine Oil Pressure Sensor parameter is greater than 4.8 volts.
    • 5-volt reference circuit terminal A
    • 5-volt reference circuit terminal C (LH2/LC3)
    • 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, with the scan tool command the engine oil pressure indicator OFF.
    • If the EOP indicator does not turn OFF, replace the IPC.
  7. If all circuits test normal, test or replace the EOP sensor.
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