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Home >> Cadillac >> 2011 >> STS AWD >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Panel System Displays And Gauges >> Diagnostic Information and Procedures >> Engine Oil Temperature Indicator Always On >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the engine oil temperature sensor.
  2. Ignition OFF, test for less than 1 Ω between the low reference circuit terminal C and ground.
    • If greater than the specified range, test the low reference circuit for an open/high resistance.
  3. Ignition ON, verify the scan tool Engine Oil Temperature Calculated parameter is less than -10°C (+14°F).
    • If greater than the specified range, test the signal circuit terminal B for a short to ground. If the circuit tests normal, replace the ECM.
  4. Ignition ON, install a 3 A fused jumper wire between the signal circuit terminal B and the low reference circuit terminal C. Verify the scan tool Engine Oil Temperature Calculated parameter is greater the 150°C (302°F).
    • If less than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.
  5. If all circuits test normal, test or replace the engine oil temperature sensor.
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