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Home >> Cadillac >> 2015 >> CTS V, Automatic Trans >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Panel System Displays And Gauges (Coupe) >> Diagnostic Information and Procedures >> DTC P0521, P0522, or P0523: Engine Oil Pressure (EOP) Sensor >> Circuit/System Testing

Circuit/System Testing

NOTE:

Circuit/System Verification must be performed before proceeding with 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 Ω between the low reference circuit terminal C (or 1) and ground.
    • If greater than the specified range, test the circuit for an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module.
  3. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal B (or 2) and ground.
    • If less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module.
    • If greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module.
  4. Verify the scan tool Engine Oil Pressure Sensor parameter is less than 0.2 V.
    • If greater than the specified range, test the signal circuit terminal A (or 3) for a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module.
  5. Install a 3A fused jumper wire between the signal circuit terminal A (or 3) and the 5 V reference circuit terminal B (or 2). Verify the scan tool Engine Oil Pressure Sensor parameter is greater than 4.8 V.
    • 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 K20 Engine Control Module.
  6. If all circuits test normal, test or replace the EOP sensor.
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