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Home › Chevrolet › 2012 › Traverse LS, AWD › Repair and Diagnosis › Electrical › Instrument Panel System Displays And Gauges › Diagnostic Information and Procedures › DTC P0521 › Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the engine oil pressure (EOP) switch.
  2. Ignition OFF, test for less than 1 ohm between the low reference circuit terminal A and ground.
    • 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, verify the scan tool Engine Oil Pressure Switch parameter is OK.
    • If not the specified value, test the signal circuit for a short to ground. If the circuit tests normal, replace the ECM.
  4. Ignition ON, install a 3A fused jumper wire between the signal circuit terminal B and the ground circuit terminal A. Verify the scan tool Engine Oil Pressure Switch parameter is Low.
    • If not the specified value, test the signal circuit for an open/high resistance. If circuit test normal, replace the ECM.
  5. If all circuits test normal, test or replace the engine oil pressure switch.
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