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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 >> Engine Oil Pressure Gauge Inaccurate or Inoperative >> 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 listed below and ground:
    • Terminal A, LFW or LFX engine
    • Terminal 3, LSA engine
    • 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 V between the 5 V reference circuit terminal listed below and ground:
    • Terminal B, LFW or LFX engine
    • Terminal 2, LSA engine
    • 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 ECM.
    • If greater than the specified range, test the 5 V 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 V.
    • If greater than the specified range, test the signal circuit terminal listed below for a short to voltage. If the circuit tests normal, replace the ECM.
    • Terminal C, LFW or LFX engine
    • Terminal 1, LSA engine
  5. Install a 3 A fused jumper wire between the signal circuit terminal listed below and the 5 V reference circuit terminal listed below. Verify the scan tool Engine Oil Pressure Sensor parameter is greater than 4.8 V.
    • Terminal A and low reference terminal C, LFW or LFX engine
    • Terminal 1 and low reference terminal 3, LSA engine
    • 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. If all circuits test normal, test or replace the engine oil pressure sensor.
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